Name: in situ synthesis of gold nanoparticles without aggregation in the interlayer space of layered titanate transparent films
Uploaded: 2017-01-17T14:00:00.000+00:00
Duration: 7 min 8 s
Description: Watch this Scientific Journal Video about In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films at JoVE.com

This work was partly supported by Nippon Sheet Glass Foundation for Materials Science and Engineering and JSPS KAKENHI (Grant-in-Aid for Challenging Exploratory Research, #50362281).

注意：化学物質やソリューションを扱うときに常に注意してください。適切な安全対策に従ってください、常に手袋、眼鏡、と白衣を着用してください。ナノ材料は、それらのバルクの対応と比較して付加的な危険性を有していてもよいことに注意してください。 リージェンツの調製<ol><li> 0.2 mMのMV 2+を与えるために水20mlに、1,1&#39;-ジメチル-4,4&#39;-ビピリジニウムジクロリド（MV 2+メチルビオロゲン）の0.0012グラムを溶解することによりメチルビオロゲン水溶液を準備します。 </li><li> 25 mMののHAuCl 4を与えるために水10mlで金（III）四三水和物の0.1050グラム（のHAuCl 4•3H 2 O）を溶解することにより、金（III）塩化物水溶液を準備します。 </li><li> 100mMのNaBH 4を与えるために水10ml中のテトラヒドロホウ酸ナトリウムの0.03844グラムを溶解し、水素化ホウ素ナトリウム水溶液（のNaBH 4）を準備します。 </li><li> dissolvによる2-ammoniumethanethiol水溶液を調製100 mMの2-AET +を与えるために、水25mlで2-ammoniumethanethiol塩化物塩（2-AET +）の0.2985グラムをる。 </li></ol> TNSコロイド懸濁液の2.合成注：チタニアナノシート（TNS; 2のTi 0.91 O）は、十分に確立された手順に従って調製以前22,23,30報告されました。 <ol><li> 20時間22、800℃で、のCs 2 CO 3（0.4040グラム）とTiO 2（0.5000グラムST-01）の化学量論混合物を焼成することにより、層状チタン酸セシウムCsの0.7のTi 1.825 O 4の出発材料を準備します。これを2回繰り返します。 </li><li>繰り返し12時間シェーカー（300 Hz）を用いて、塩酸（100mMの、81.42ミリリットル）水溶液とチタン酸セシウムの0.8142グラムを処理することによってプロトン化層状チタン酸（H 0.7のTi 1.825 O 4・H 2 O）を準備します。 </li><li>剥離した層状チタン酸（TNS）によってコロイド懸濁液を準備します暗条件下で、周囲温度で約2週間の水溶液- 17 mMの水酸化テトラブチルアンモニウム（TBA + OH）の25ミリリットルとプロトン化チタン酸粉末（0.0998グラム）を激しく（500 rpm）し、攪拌。得られた乳白色の懸濁液を剥離チタニアナノシート（; 1.4グラム/ L、= 11〜12のpH TNS）が含まれています。 </li></ol> TNSフィルム21の3の合成<ol><li> TNSのキャストフィルム（C-TNS）の調製 <ol><li>予備清浄なガラス基板（〜20×20 mm 2）と30分間、1Mの水性水酸化ナトリウム（NaOH）で超音波洗浄機（27キロヘルツ）を用いて超音波処理を介し。 </li><li>超純水の5-10 mLの（&lt;0.056μSセンチ-1）で基板を洗浄します。 </li><li> 3分間、0.1Mの水性塩酸（HCl）でガラス基板を浸漬し、超純水5〜10mlのですすいでください。 </li><li> 1時間純水中で超音波処理（27 kHzの）を介して基板をきれいにし、その後、純水で洗い流してください。 （乾燥するまで）2-3分間ヘアドライヤーで乾燥しました。 </li><li> 300μlのアリコートでガラス基板上に、TNSのコロイド懸濁液をキャストします。 </li><li> C-TNSフィルムを与えるために、乾燥炉を用いて2時間60℃で乾燥しました。 </li></ol></li><li> 焼結TNSフィルム（S-TNS）の調製 <ol><li>ガラス基板（S-TNSフィルム）上TNS部品の熱定着を達成するために、3時間500℃で焼結空気中で得られたC-TNSフィルムを（6.8°Cの速度で25〜500℃から加熱/分）オーブンを用いて。 </li><li>二度焼結プロセスを繰り返します。 </li></ol></li><li> フィルムの作製 <ol><li> S-TNS膜を溶液に浸漬されている場合、それはすべての実験手順のための上部を向くように、堆積したS-TNSフィルムを配置します。 </li><li> TNSの光反応を回避するために、アルミホイルでセットアップを覆うことによって、暗条件下ですべての実験を行います。 </li></ol></li><li> プレメチルビオロゲン（MV 2+）インターカレーTNSフィルム（TNS / MV 2+）のparation <ol><li>暗条件下で室温（RT）で7時間ペトリ皿でMV 2+二塩化塩の水溶液（0.2 mMの、3ミリリットル）中のs-TNSフィルムを浸し。 </li><li> 〜1時間暗所でオーブンを用いて60℃の空気中での超純水（5〜10 ml）で得られた試​​料をすすぎ、乾燥しました。 </li></ol></li><li> 金の調製（III）インターカレーTNSフィルム（TNS /金（III）） <ol><li>暗条件下で室温で3時間、ペトリ皿中のHAuCl 4の水溶液（25mMの、3ミリリットル）にTNS / MV 2+フィルムを浸し。 </li><li> 〜1時間暗所でオーブンを用いて60℃の空気中での超純水（5〜10 ml）で得られた試​​料をすすぎ、乾燥しました。 </li></ol></li><li> TNSフィルムの層間空間内のAuNPの合成（TNS / AuNP） <ol><li> NaBH 4水溶液にTNS /金（III）膜を浸漬</sub&gt;暗条件下で室温で0.5時間、ペトリ皿中（0.1 M、5ミリリットル）。 </li><li> 〜1時間、暗所で、オーブンを用いて60℃の空気中で得られた膜を乾燥させます。 </li></ol></li><li> 2-AET +インターカレーTNS薄膜の作製（TNS / 2-AET +） <ol><li>室温で24時間、ペトリ皿中（0.1M、3mL）で- 2-AET + Clでの水溶液中のS-TNS膜を浸します。 </li><li>リンスは、約1時間、暗所で、オーブンを用いて60℃の空気中での超純水（5〜10 ml）および乾燥を有するフィルムを得ました。 </li></ol></li><li> 金（III）および2- AET +共インターカレーTNSフィルム（TNS / 2-AET + /金（III））。 <ol><li> RTで3時間のHAuCl 4水溶液（25ミリモル、3 ml）中TNS / 2-AET +膜を浸します。 </li><li> 〜1時間暗所でオーブンを用いて60℃の空気中での超純水（5〜10 ml）で得られたフィルムをすすぎ、乾燥しました。 </li></ol></li><li> AuNP withiの合成nはTNS / 2-AET +フィルムの層間スペース（TNS / 2-AET + / AuNP）。 <ol><li>暗条件下で室温で0.5時間、ペトリ皿中のNaBH 4（0.1 M、5ミリリットル）の水溶液中でTNS / 2-AET + /金（III）膜を浸し。 </li><li> 〜1時間暗所でオーブンを用いて60℃の空気中での超純水（5〜10 ml）で得られたフィルムをすすぎ、乾燥しました。 </li></ol></li><li> キャラクタリゼーション <ol><li> 30キロボルトと15ミリアンペアで操作X線回折（XRD）単色Cu-Kα放射（λ= 0.15405 nm）を備えたデスクトップX線回折装置を使用して21を解析し、実行します。 </li><li>エネルギー分散型X線分光法（EDS）スペクトル21を取ります。 </li><li>透過モード21を使用して調製したサンプルについて、UV-Vis吸収スペクトルを記録するマルチチャンネル光検出器または定常紫外-可視（UV-Vis）で吸光分光光度計を使用します。 </li></ol></li></ol>

We have nothing to disclose.

この原稿は、TNSフィルムの層間空間内の金ナノ粒子（AuNPs）のin situ合成のための詳細なプロトコルを提供します。これは、TNSの層間空間内AuNPsのin situ合成の最初の報告です。さらに、我々は2-AET +は、TNSの層間内AuNPsのための有効な保護試薬として機能することがわかりました。これらのメソッドはAuNPsとTNS透明フィルムをハイブリダイズしました。プロトコルセクション...

種々の貴金属ナノ粒子（MNPの）は、それらの局在表面プラズモン共鳴（LSPR）特性に特徴色または色調を呈します。従って、のMNPは、様々な光学的および/または光化学用途1-4で使用することができます。最近、金属酸化物半導体（MOS）は、酸化チタン（TiO 2）とのMNPのような光触媒の組み合わせは、十分に光触媒5-14の新しいタイプとして研究されてきました。ほとんどのMOS粒子は、比較的低い表面積を有するしかし、多くの場合、のMNPの非常に少量が、MOSの表面上に存在します。一方、層状金属酸化物半導体（LMOSs）光触媒特性を示し、大きな表面積を有し、LMOS 15-17の単位グラム当たり典型的には数百平方メートル。さらに、様々なLMOSsは、インターカレーション特性（ すなわち、種々の化学種が、その拡張可能と大きな層間空間内に収容することができる）15-20を有します。したがって、のMNP及びLMOSsの組み合わせで、それのMNP比較的大量の半導体光触媒とハイブリダイズさせることが期待されます。 非常に単純な工程を経て透明フィルム;私たちは、LMOSの層間空間内の銅ナノ粒子（CuNPs）21のその場合成の最初の （TNS 16-30チタニアナノシート）を報告しています。しかし、合成手順の詳細、および他の貴族のMNPとTNSハイブリッドの特性はまだ報告されていません。また、TNS層内CuNPsは容易に酸化し、周囲条件下21の下で脱色しました。このように、我々はAuNPsが広く、様々な光学的、光化学的に使用されているため、金ナノ粒子（AuNPs）に着目し、触媒用途、それらが酸化に対して比較的安定であることが予想される3-5,7,8,10-14 、28,31,32。ここでは、TNSおよびshow股関節の層間空間内AuNPsの合成を報告しますトン2-ammoniumethanethiol（2-AET +; 図1挿入図）は、TNSの層間内AuNPsの保護試薬として有効に働きます。

<table><tbody><tr><td>Methyl viologen dichloride</td><td>Aldrich Chemical&amp;nbsp; Co., Inc.</td><td>1910-42-5</td><td></td></tr><tr><td>Tetrabutylammonium hydroxide</td><td>TCI</td><td>T1685</td><td></td></tr><tr><td>cesium carbonate</td><td>Kanto Chemical Co., Inc.</td><td>07184-33</td><td></td></tr><tr><td>anatase titanium dixoide</td><td>Ishihara Sangyo Ltd.</td><td>ST-01</td><td></td></tr><tr><td>hydrochloric acid</td><td>Junsei Chemical Co., Ltd.</td><td>20010-0350</td><td></td></tr><tr><td>sodium hydroxide</td><td>Junsei Chemical Co., Ltd.</td><td>195-13775</td><td></td></tr><tr><td>Tetrachloroauric(III) acid trihydrate</td><td>Kanto Chemical Co., Inc.</td><td>17044-60</td><td></td></tr><tr><td>sodium tetrahydroborate</td><td>Junsei Chemical Co., Ltd.</td><td>39245-1210</td><td></td></tr><tr><td>2-ammoniumethanethiol hydrochloride</td><td>TCI</td><td>A0296</td><td></td></tr><tr><td>Ultrapure water (0.056 &amp;micro;S/cm)</td><td></td><td></td><td>Milli-Q water purification system (Direct-Q&lt;sup&gt;&amp;reg;&lt;/sup&gt; 3UV, Millipore)</td></tr><tr><td>Microscope slide (Thickness: 1.0&amp;#8211;1.2 mm)</td><td>Matsunami glass Co., Ltd.</td><td></td><td></td></tr></tbody></table>

in situ synthesis of gold nanoparticles without aggregation in the interlayer space of layered titanate transparent films

Combinations of metal oxide semiconductors and gold nanoparticles (AuNPs) have been investigated as new types of materials. The in situ synthesis of AuNPs within the interlayer space of semiconducting layered titania nanosheet (TNS) films was investigated here. Two types of intermediate films (i.e., TNS films containing methyl viologen (TNS/MV2+) and 2-ammoniumethanethiol (TNS/2-AET+)) were prepared. The two intermediate films were soaked in an aqueous tetrachloroauric(III) acid (HAuCl4) solution, whereby considerable amounts of Au(III) species were accommodated within the interlayer spaces of the TNS films. The two types of obtained films were then soaked in an aqueous sodium tetrahydroborate (NaBH4) solution, whereupon the color of the films immediately changed from colorless to purple, suggesting the formation of AuNPs within the TNS interlayer. When only TNS/MV2+ was used as the intermediate film, the color of the film gradually changed from metallic purple to dusty purple within 30 min, suggesting that aggregation of AuNPs had occurred. In contrast, this color change was suppressed by using the TNS/2-AET+ intermediate film, and the AuNPs were stabilized for over 4 months, as evidenced by the characteristic extinction (absorption and scattering) band from the AuNPs.

前駆体フィルムの二つのタイプ（ すなわち、とし、TNSの層間内に保護試薬（2-AET +）なしで）、本研究で使用しました。 2-AET +の非存在下では、1,1&#39;-ジメチル-4,4&#39;-ビピリジニウムジクロリド（メチルビオロゲン、MV 2+）MV 2+含有LMOSsがされているので、中間領域のエクスパンダとして使用されました頻繁にLMOSs 16,17,21,33-36?...

Watch this Scientific Journal Video about In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films at JoVE.com

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

ここでは、AuNPsの凝集せず、層状チタン酸膜の層間空間内の金ナノ粒子（AuNPs）のin situ合成のためのプロトコルを提示します。いいえスペクトル変化はあっても4ヶ月後には観察されませんでした。合成された材料は、触媒、光触媒、及び費用対効果プラズモンデバイスの開発への応用が期待されています。

層状チタン酸透明フィルムの層間空間で凝集することなく金ナノ粒子のその場合成で

Combinations of metal oxide semiconductors and gold nanoparticles (AuNPs) have been investigated as new types of materials. The in situ synthesis of AuNPs ...

in-situ-synthesis-gold-nanoparticles-without-aggregation-interlayer

Research

JoVE Journal

Engineering

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

8.0K ビュー.  Niigata University. ここでは、AuNPsの凝集せず、層状チタン酸膜の層間空間内の金ナノ粒子（AuNPs）のin situ合成のためのプロトコルを提示します。いいえスペクトル変化はあっても4ヶ月後には観察されませんでした。合成された材料は、触媒、光触媒、及び費用対効果プラズモンデバイスの開発への応用が期待されています。 

ビデオ: In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance

A nearly parallel array of pores can be produced by anodizing aluminum foils in acidic environments1, 2. Applications of anodic aluminum oxide (AAO) membranes have been under development since the 1990's and have become a common method to template the synthesis of high aspect ratio nanostructures, mostly by electrochemical growth or pore-wetting. Recently, these membranes have become commercially available in a wide range of pore sizes and densities, leading to an extensive library of functional nanostructures being synthesized from AAO membranes. These include composite nanorods, nanowires and nanotubes made of metals, inorganic materials or polymers 3-10. Nanoporous membranes have been used to synthesize nanoparticle and nanotube arrays that perform well as refractive index sensors, plasmonic biosensors, or surface enhanced Raman spectroscopy (SERS) substrates 11-16, as well as a wide range of other fields such as photo-thermal heating 17, permselective transport 18, 19, catalysis 20, microfluidics 21, and electrochemical sensing 22, 23. Here, we report a novel procedure to prepare gold nanotubes in AAO membranes. Hollow nanostructures have potential application in plasmonic and SERS sensing, and we anticipate these gold nanotubes will allow for high sensitivity and strong plasmon signals, arising from decreased material dampening 15.

Solution-suspendable gold nanotubes with controlled dimensions can be synthesized by electrochemical deposition in porous anodic aluminum oxide (AAO) membranes using a hydrophobic polymer core. Gold nanotubes and nanotube arrays hold promise for applications in plasmonic biosensing, surface-enhanced Raman spectroscopy, photo-thermal heating, ionic and molecular transport, microfluidics, catalysis and electrochemical sensing.

テンプレートには、調整可能な赤外線吸光度モニック金ナノチューブの合成を監督

A nearly parallel array of pores can be produced by anodizing aluminum foils in acidic environments1, 2. Applications of anodic aluminum oxide (AAO) ...

化学

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

This protocol describes a self-assembly technique to create macroscopic monolayer films composed of ligand-coated nanoparticles1,2. The simple, robust and scalable technique efficiently functionalizes metallic nanoparticles with thiol-ligands in a miscible water/organic solvent mixture allowing for rapid grafting of thiol groups onto the gold nanoparticle surface. The hydrophobic ligands on the nanoparticles then quickly phase separate the nanoparticles from the aqueous based suspension and confine them to the air-fluid interface. This drives the ligand-capped nanoparticles to form monolayer domains at the air-fluid interface.&#160; The use of water-miscible organic solvents is important as it enables the transport of the nanoparticles from the interface onto template-free substrates.&#160; The flow is mediated by a surface tension gradient3,4 and creates macroscopic, high-density, monolayer nanoparticle-ligand films.&#160; This self-assembly technique may be generalized to include the use of particles of different compositions, size, and shape and may lead to an efficient assembly method to produce low-cost, macroscopic, high-density, monolayer nanoparticle films for wide-spread applications.

A simple, robust and scalable technique to functionalize and self-assemble macroscopic nanoparticle-ligand monolayer films onto template-free substrates is described in this protocol.

テンプレート·フリー基板上に巨視的粒子 - リガンド単層フィルムを官能して自己組織化するための技術

This protocol describes a self-assembly technique to create macroscopic monolayer films composed of ligand-coated nanoparticles1,2. The simple, robust and ...

Synthesis, Assembly, and Characterization of Monolayer Protected Gold Nanoparticle Films for Protein Monolayer Electrochemistry

Colloidal gold nanoparticles protected with alkanethiolate ligands called monolayer protected gold clusters (MPCs) are synthesized and subsequently incorporated into film assemblies that serve as adsorption platforms for protein monolayer electrochemistry (PME). PME is utilized as the model system for studying electrochemical properties of redox proteins by confining them to an adsorption platform at a modified electrode, which also serves as a redox partner for electron transfer (ET) reactions. Studies have shown that gold nanoparticle film assemblies of this nature provide for a more homogeneous protein adsorption environment and promote ET without distance dependence compared to the more traditional systems modified with alkanethiol self-assembled monolayers (SAM).1-3 In this paper, MPCs functionalized with hexanethiolate ligands are synthesized using a modified Brust reaction4 and characterized with ultraviolet visible (UV-Vis) spectroscopy, transmission electron microscopy (TEM), and proton (1H) nuclear magnetic resonance (NMR). MPC films are assembled on SAM modified gold electrode interfaces by using a "dip cycle" method of alternating MPC layers and dithiol linking molecules. Film growth at gold electrode is tracked electrochemically by measuring changes to the double layer charging current of the system. Analogous films assembled on silane modified glass slides allow for optical monitoring of film growth and cross-sectional TEM analysis provides an estimated film thickness. During film assembly, manipulation of the MPC ligand protection as well as the interparticle linkage mechanism allow for networked films, that are readily adaptable, to interface with redox protein having different adsorption mechanism. For example, Pseudomonas aeruginosa azurin (AZ) can be adsorbed hydrophobically to dithiol-linked films of hexanethiolate MPCs and cytochrome c (cyt c) can be immobilized electrostatically at a carboxylic acid modified MPC interfacial layer. In this report, we focus on the film protocol for the AZ system exclusively. Investigations involving the adsorption of proteins on MPC modified synthetic platforms could further the understanding of interactions between biomolecules and man-made materials, and consequently aid the development of biosensor schemes, ET modeling systems, and synthetic biocompatible materials.5-8

Alkanethiolate stabilized gold colloids known as monolayer protected clusters (MPCs) are synthesized, characterized, and assembled into thin films as an adsorption interface for protein monolayer electrochemistry of simple redox protein like Pseudomonas aeruginosa azurin (AZ) and cytochrome c (cyt c).

合成、組立、および単分子膜のキャラクタリゼーションは、タンパク質単分子層の電気化学のための金ナノ粒子膜を保護

Colloidal gold nanoparticles protected with alkanethiolate ligands called monolayer protected gold clusters (MPCs) are synthesized and subsequently ...

生物工学

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

As a promising catalytically active nano reactor, gold nanoparticles intercalated in mesoporous silica (GMS) were successfully synthesized and properties of the materials were investigated. We used a one pot sol-gel approach to intercalate gold nano particles in the walls of mesoporous silica. To start with the synthesis, P123 was used as template to form micelles. Then TESPTS was used as a surface modification agent to intercalate gold nano particles. Following this process, TEOS was added in as a silica source which underwent a polymerization process in acid environment. After hydrothermal processing and calcination, the final product was acquired. Several techniques were utilized to characterize the porosity, morphology and structure of the gold intercalated mesoporous silica. The results showed a stable structure of mesoporous silica after gold intercalation. Through the oxidation of benzyl alcohol as a benchmark reaction, the GMS materials showed high selectivity and recyclability.

Here, we present a protocol with a sol-gel process to synthesize gold intercalated in the walls of mesoporous materials (GMS), which is confirmed to possess a mesoporous matrix with gold intercalated in the walls imparting great stability and recyclability.

合成とメソポーラスシリカの壁に金インターカレーの触媒性能

As a promising catalytically active nano reactor, gold nanoparticles intercalated in mesoporous silica (GMS) were successfully synthesized and properties ...

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method

The physical, chemical and optical properties of nano-scale colloids depend on their material composition, size and shape 1-5. There is a great interest in using nano-colloids for photo-thermal ablation, drug delivery and many other biomedical applications 6. Gold is particularly used because of its low toxicity 7-9. A property of metal nano-colloids is that they can have a strong surface plasmon resonance 10. The peak of the surface plasmon resonance mode depends on the structure and composition of the metal nano-colloids. Since the surface plasmon resonance mode is stimulated with light there is a need to have the peak absorbance in the near infrared where biological tissue transmissivity is maximal 11, 12.
We present a method to synthesize star shaped colloidal gold, also known as star shaped nanoparticles 13-15 or nanostars 16. This method is based on a solution containing silver seeds that are used as the nucleating agent for anisotropic growth of gold colloids 17-22. Scanning electron microscopy (SEM) analysis of the resulting gold colloid showed that 70 % of the nanostructures were nanostars. The other 30 % of the particles were amorphous clusters of decahedra and rhomboids. The absorbance peak of the nanostars was detected to be in the near infrared (840 nm). Thus, our method produces gold nanostars suitable for biomedical applications, particularly for photo-thermal ablation.

We synthesized star shaped gold nanostars using a silver seed mediated growth method. The diameter of the nanostars ranges from 200 to 300 nm and the number of tips vary from 7 to 10. The nanoparticles have a broad surface plasmon resonance mode centered in the near infrared.

シルバーシード媒介成長法によるゴールドNanostarの合成

The physical, chemical and optical properties of nano-scale colloids depend on their material composition, size and shape 1-5. There is a great interest ...

Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate

This paper describes the synthesis and peroxide-modification of nanosize monosodium titanate (nMST), along with an ion-exchange reaction to load the material with Au(III) ions. The synthesis method was derived from a sol-gel process used to produce micron-sized monosodium titanate (MST), with several key modifications, including altering reagent concentrations, omitting a particle seed step, and introducing a non-ionic surfactant to facilitate control of particle formation and growth. The resultant nMST material exhibits spherical-shaped particle morphology with a monodisperse distribution of particle diameters in the range from 100 to 150&#160;nm. The nMST material was found to have a Brunauer-Emmett-Teller (BET) surface area of 285 m2g-1, which is more than an order of magnitude higher than the micron-sized MST. The isoelectric point of the nMST measured 3.34 pH units, which is a pH unit lower than that measured for the micron-size MST. The nMST material was found to serve as an effective ion exchanger under weakly acidic conditions for the preparation of an Au(III)-exchange nanotitanate. In addition, the formation of the corresponding peroxotitanate was demonstrated by reaction of the nMST with hydrogen peroxide.

The surfactant mediated sol-gel synthesis of nanosized monosodium titanate is described, along with preparation of the corresponding peroxide modified material. An ion-exchange reaction with Au(III) is also presented.

ナノサイズ一ナトリウムチタン酸の合成と反応化学

This paper describes the synthesis and peroxide-modification of nanosize monosodium titanate (nMST), along with an ion-exchange reaction to load the ...

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions

Reducing dilute aqueous HAuCl4 with sodium thiocyanate (NaSCN) under alkaline conditions produces 2 to 3 nm diameter nanoparticles. Stable grape-like oligomeric clusters of these yellow nanoparticles of narrow size distribution are synthesized under ambient conditions via two methods. The delay-time method controls the number of subunits in the oligoclusters by varying the time between the addition of HAuCl4 to alkaline solution and the subsequent addition of reducing agent, NaSCN. The yellow oligoclusters produced range in size from ~3 to ~25 nm. This size range can be further extended by an add-on method utilizing hydroxylated gold chloride (Na+[Au(OH4-x)Clx]-) to auto-catalytically increase the number of subunits in the as-synthesized oligocluster nanoparticles, providing a total range of 3 nm to 70 nm. The crude oligocluster preparations display narrow size distributions and do not require further fractionation for most purposes. The oligoclusters formed can be concentrated &#62;300 fold without aggregation and the crude reaction mixtures remain stable for weeks without further processing. Because these oligomeric clusters can be concentrated before derivatization they allow expensive derivatizing agents to be used economically. In addition, we present two models by which predictions of particle size can be made with great accuracy.

We describe a simple method for producing highly stable oligomeric clusters of gold nanoparticles via the reduction of chloroauric acid (HAuCl4) with sodium thiocyanate (NaSCN). The oligoclusters have a narrow size distribution and can be produced with a wide range of sizes and surface coats.

周囲条件下での金ナノ粒子の安定オリゴマークラスターのサイズ制御された合成のための簡単​​な方法

Reducing dilute aqueous HAuCl4 with sodium thiocyanate (NaSCN) under alkaline conditions produces 2 to 3 nm diameter nanoparticles. Stable grape-like ...

Large Area Substrate-Based Nanofabrication of Controllable and Customizable Gold Nanoparticles Via Capped Dewetting

Recent scientific advances in the utilization of metallic nanoparticle for enhanced energy conversion efficiency, improved optical device performance, and high-density data storage have demonstrated the potential benefit of their use in industrial applications. These applications require precise control over nanoparticle size, spacing, and sometimes shape. These requirements have resulted in the use of time and cost intensive processing steps to produce nanoparticles, thus making the transition to industrial application unrealistic. This protocol will resolve this issue by providing a scalable and affordable method for the large-area production of nanoparticle films with improved nanoparticle control compared to the current techniques. In this article, the process will be demonstrated with gold, but other metals can also be used.

This protocol details a novel nano-manufacturing technique that can be used to make controllable and customizable nanoparticle films over large areas based on the self-assembly of dewetting of capped metal films.

頂いたディウェッティング経由で制御可能なカスタマイズ可能な金ナノ粒子の大面積基板を用いたナノ加工

Recent scientific advances in the utilization of metallic nanoparticle for enhanced energy conversion efficiency, improved optical device performance, and ...

工学

Growth of Gold Dendritic Nanoforests on Titanium Nitride-coated Silicon Substrates

In this study, a high-power impulse magnetron sputtering system is used to coat a flat and firm titanium nitride (TiN) film on silicon (Si) wafers, and a fluoride-assisted galvanic replacement reaction (FAGRR) is employed for the rapid and easy deposition of gold dendritic nanoforests (Au DNFs) on the TiN/Si substrates. Scanning electron microscopy (SEM) images and energy-dispersive X-ray spectroscopy patterns of TiN/Si and Au DNFs/TiN/Si samples validate that the synthesis process is accurately controlled. Under the reaction conditions in this study, the thickness of the Au DNFs increases linearly to 5.10 &#177; 0.20 &#181;m within 15 min of the reaction. Therefore, the employed synthesis procedure is a simple and rapid approach for preparing Au DNFs/TiN/Si composites.

This study presents a feasible procedure for synthesizing gold dendritic nanoforests on titanium nitride/silicon substrates. The thickness of gold dendritic nanoforests increases linearly within 15 min of a synthesis reaction.

窒化チタン被覆シリコン基板上の金樹状 Nanoforests の成長

In this study, a high-power impulse magnetron sputtering system is used to coat a flat and firm titanium nitride (TiN) film on silicon (Si) wafers, and a ...

Gold Nanoparticle Synthesis

Gold nanoparticles (Au nanoparticles) that are ~12 nm in diameter were synthesized by rapidly injecting a solution of 150 mg (0.15 mmol) of tetrachloroauric acid in 3.0 g (3.7 mmol, 3.6 mL) of oleylamine (technical grade) and 3.0 mL of toluene into a boiling solution of 5.1 g (6.4 mmol, 8.7 mL) of oleylamine in 147 mL of toluene. While boiling and mixing the reaction solution for 2 hours, the color of the reaction mixture changed from clear, to light yellow, to light pink, and then slowly to dark red. The heat was then turned off, and the solution was allowed to gradually cool down to room temperature for 1 hour. The gold nanoparticles were then collected and separated from the solution using a centrifuge and washed three times; by vortexing and dispersing the gold nanoparticles in 10 mL portions of toluene, and then precipitating the gold nanoparticles by adding 40 mL portions of methanol and spinning them in a centrifuge. The solution was then decanted to remove any remaining byproducts and unreacted starting materials. Drying the gold nanoparticles in a vacuum environment produced a solid black pellet; which could be stored for long periods of time (up to one year) for later use, and then redissolved in organic solvents such as toluene.

A protocol for synthesizing ~12 nm diameter gold nanoparticles (Au nanoparticles) in an organic solvent is presented. The gold nanoparticles are capped with oleylamine ligands to prevent agglomeration. The gold nanoparticles are soluble in organic solvents such as toluene.

層状チタン酸透明フィルムの層間空間で凝集することなく金ナノ粒子のその場合成で

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テンプレートには、調整可能な赤外線吸光度モニック金ナノチューブの合成を監督

テンプレート·フリー基板上に巨視的粒子 - リガンド単層フィルムを官能して自己組織化するための技術

合成、組立、および単分子膜のキャラクタリゼーションは、タンパク質単分子層の電気化学のための金ナノ粒子膜を保護

合成とメソポーラスシリカの壁に金インターカレーの触媒性能

シルバーシード媒介成長法によるゴールドNanostarの合成

ナノサイズ一ナトリウムチタン酸の合成と反応化学

周囲条件下での金ナノ粒子の安定オリゴマークラスターのサイズ制御された合成のための簡単な方法

頂いたディウェッティング経由で制御可能なカスタマイズ可能な金ナノ粒子の大面積基板を用いたナノ加工

窒化チタン被覆シリコン基板上の金樹状 Nanoforests の成長

ゴールドナノ粒子合成

層状チタン酸透明フィルムの層間空間で凝集することなく金ナノ粒子のその場合成で

要約

さらに動画を探す

この動画の章

テンプレートには、調整可能な赤外線吸光度モニック金ナノチューブの合成を監督

テンプレート·フリー基板上に巨視的粒子 - リガンド単層フィルムを官能して自己組織化するための技術

合成、組立、および単分子膜のキャラクタリゼーションは、タンパク質単分子層の電気化学のための金ナノ粒子膜を保護

合成とメソポーラスシリカの壁に金インターカレーの触媒性能

シルバーシード媒介成長法によるゴールドNanostarの合成

ナノサイズ一ナトリウムチタン酸の合成と反応化学

周囲条件下での金ナノ粒子の安定オリゴマークラスターのサイズ制御された合成のための簡単​​な方法

頂いたディウェッティング経由で制御可能なカスタマイズ可能な金ナノ粒子の大面積基板を用いたナノ加工

窒化チタン被覆シリコン基板上の金樹状 Nanoforests の成長

ゴールドナノ粒子合成

周囲条件下での金ナノ粒子の安定オリゴマークラスターのサイズ制御された合成のための簡単な方法