Name: synthesis of substrate-bound au nanowires via an active surface growth mechanism
Uploaded: 2018-07-18T15:00:00
Description: Watch this Scientific Journal Video about Synthesis of Substrate-Bound Au Nanowires Via an Active Surface Growth Mechanism at JoVE.com

Nous reconnaissons l’appui financier de la Fondation nationale des sciences naturelles de Chine (21703104), Jiangsu Science et technologie Plan (SBK2017041514) Nanjing Tech University (39837131) et SICAM Fellowship de Jiangsu National synergique Centre d’innovation pour les matériaux de pointe.

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1. synthèse de nanoparticules de semences
Remarque : Pour éviter une panne causée p...

<ol>
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Le mécanisme de cette synthèse de nanofils de croissance active de surface régie a été examiné globalement par précédent travail19. En outre, les effets des types et tailles de graines ainsi que l’effet de ligand types et tailles ont également été étudiés20,21. En général. la croissance de nanofils est très différente de la précédentes itinéraires signalés. Aucun modèle n’est requise, et la croissance asymétrique...

Typique d’un nanomatériaux dimensionnelle, nanofils possèdent les propriétés uniques provenance les effets quantiques de la structure de l’échelle nanométrique et les propriétés associées en vrac. Comme un pont entre l’échelle nanométrique et ces matières échelle, elles ont été largement appliquées dans divers domaines de la catalyse, télédétection et nanoélectroniques, etc.. 1 , 2 , 3.
Cependant, la synthèse de nanofils a longtemps été un grand défi, car elle exige généralement briser la symétrie intrinsèque dans les cristaux. Traditionnellement, un modèle est employé pour réglementer le dépôt de matériaux. Par exemple, modèle-électrodéposition a été utilisé pour la formation de divers types de nanofils comme Ag nanofils et CdS nanofils4,5,6,7,8,9 ,,10. Une autre approche commune est la croissance de vapeur-liquide-solide (VLS), qui emploie un catalyseur fondu pour induire la croissance anisotrope sur le substrat à une température élevée11. Des stratégies communes pour la synthèse de nanofils métalliques sont les méthodes de polyol de nanofils Ag et les oleylamine-assisted ultraminces Au nanofils12,13,14,15. Les deux approches sont spécifiques au matériel, et les paramètres de nanofils ne sont pas facilement accordés au cours de la synthèse. En outre, les nanofils métalliques peuvent également se former par la méthode axée sur la pression, où les nanoparticules métalliques assemblés sont mécaniquement compressées et soudées en nanofils16,17,18.
Récemment, nous avons rapporté une méthode distinctive à la synthèse de nanofils Au19. Avec l’aide d’un ligand de petite molécule THIOLÉS, les nanofils pourraient croissent et forment un tableau aligné verticalement sur la majeure partie du substrat wafer Si aux conditions ambiantes. Il a été constaté que les ligands jouent un rôle important dans la croissance de la rupture de symétrie. Il se lie à la surface des graines Au substrat-adsorbé fortement, forçant l’UA aller déposer sélectivement à l’interface de ligand déficient entre les graines et le substrat. L’interface entre l’UA nouvellement déposée et le substrat reste ligand déficient, par conséquent, la surface active existe tout au long de la croissance de l’ensemble. En ajustant la concentration de ligand, le type de graine et de concentration ainsi que plusieurs autres paramètres, une série d’UA axée sur les nanofils nanostructures pouvait être synthétisée.
Dans ce travail, nous fournirons un protocole détaillé pour cette synthèse de nanofils Au pratique. La synthèse de dérivés est également présentée, y compris la synthèse de nanofils UA avec propriété surface hydrophobe, UA nanofils sur d’autres substrats, conique Au nanofils en mélangeant deux ligands et les nanostructures Au axée sur les nanofils formés par le réglage de la croissance conditions.

<table border="0" cellpadding="0" cellspacing="0" width="846">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:256px;">Trisodium citrate dihydrate</td>
			<td style="width:209px;">Alfa Aesar</td>
			<td style="width:179px;">LoT: 5008F14U</td>
			<td style="width:203px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sodium borohydride</td>
			<td style="width:209px;">Fluka</td>
			<td style="width:179px;">LoT: STBG0330V</td>
			<td>NaBH4</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Hydrogen tetrachloroaurate(III) trihydrate</td>
			<td style="width:209px;">Alfa Aesar</td>
			<td style="width:179px;">LoT: T19C006</td>
			<td style="width:203px;">HAuCl4</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">3-aminopropyltriethoxysilane</td>
			<td style="width:209px;">J&#38;K Scientific</td>
			<td style="width:179px;">LoT: LT20Q102</td>
			<td style="width:203px;">APTES</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">L-ascorbic acid&#160;</td>
			<td>Sigma-Aldrich</td>
			<td style="width:179px;">LoT: SLBL9227V</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">4-mercaptobenzoic acid</td>
			<td>Sigma-Aldrich</td>
			<td style="width:179px;">LoT: MKBV5048V</td>
			<td style="width:203px;">4-MBA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">2-Naphthalenethiol</td>
			<td>Sigma-Aldrich</td>
			<td style="width:179px;">LoT: BCBP4238V</td>
			<td>2-NpSH</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">4-Mercaptophenylacetic acid</td>
			<td style="width:209px;">Alfa Aesar</td>
			<td style="width:179px;">LoT: 10199160</td>
			<td>4-MPAA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">3-mercaptobenzoic acid</td>
			<td style="width:209px;">Aladdin</td>
			<td style="width:179px;">LoT: G1213027</td>
			<td>3-MBA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">3-Mercaptopropionic acid</td>
			<td style="width:209px;">Aladdin</td>
			<td style="width:179px;">LoT: E1618095</td>
			<td>3-MPA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">absolute ethanol</td>
			<td style="width:209px;">Sinopharm chemical Reagent</td>
			<td style="width:179px;">20170802</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:256px;">Silicon wafer</td>
			<td style="width:209px;">Zhe Jiang lijing</td>
			<td style="width:179px;">P</td>
			<td>Si</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Scanning Electron Microscope</td>
			<td style="width:209px;">Quanta FEG 250</td>
			<td style="width:179px;"></td>
			<td>SEM</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Centrifuge&#160;</td>
			<td style="width:209px;">Eppendorf</td>
			<td style="width:179px;">5424</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Ultrasonic cleaner&#160;</td>
			<td style="width:209px;">Kun Shan hechuang</td>
			<td style="width:179px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:256px;">Ultra-pure water system</td>
			<td style="width:209px;">NanJing qianyan</td>
			<td style="width:179px;">UP6682-10-11</td>
			<td>for deionized water</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:256px;">Plasma cleaner</td>
			<td style="width:209px;">Harrick Plasma</td>
			<td style="width:179px;">PDC-002</td>
			<td>for oxygen plasma</td>
		</tr>
	</tbody>
</table>

synthesis of substrate-bound au nanowires via an active surface growth mechanism

Faire progresser les capacités de synthèse est important pour le développement des nanosciences et des nanotechnologies. La synthèse de nanofils a toujours été un défi, car elle exige une croissance asymétrique des cristaux symétrique. Nous rapportons ici une synthèse distinctive de nanofils Au substrat-bondissent. Cette synthèse exempt de modèle emploie des ligands THIOLÉS et adsorption de substrat pour atteindre le dépôt continu asymétrique d’UA en solution dans les conditions ambiantes. Le ligand THIOLÉS a empêché le dépôt de l’UA sur la surface exposée des graines, donc la déposition de l’UA se produit uniquement à l’interface entre les graines de l’UA et le substrat. Du côté des nanofils Au nouveau dépôts est immédiatement couvert avec le ligand THIOLÉS, tandis que le bas vers le substrat reste sans ligand et active pour la prochaine série de dépôts Au. Par ailleurs, nous démontrent que cette croissance de nanofils UA peut être induite sur divers substrats et THIOLÉS différents ligands peuvent être utilisés pour réguler la chimie de surface des nanofils. Le diamètre des nanofils peut également être contrôlé avec des ligands mixtes, dans lequel un autre ligand « mauvais » pourrait se transformer sur la croissance latérale. Grâce à la compréhension du mécanisme, Au axée sur les nanofils nanostructures peut être conçu et synthétisé.

Les graines de nanoparticules Au, substrat-bondissent Au nanofils et Au nanostructures dérivés axée sur les nanofils sont caractérisés avec SEM. Figure 1 montre les images représentatives de la SEM de 3 à 5 nm Au nanoparticules, 15 nm Au nanoparticules et 40 nm Au NANOPARTICULES adsorbés sur la plaquette Si, confirmant leurs tailles, l’adsorption et la distribution. Les nanofils UA issues de graines respectifs sur le substrat de plaquette Si sont é...

Watch this Scientific Journal Video about Synthesis of Substrate-Bound Au Nanowires Via an Active Surface Growth Mechanism at JoVE.com

Synthesis of Substrate-Bound Au Nanowires Via an Active Surface Growth Mechanism

Nous rapportons une méthode axée sur la solution de synthétiser des nanofils Au substrat-bondissent. En ajustant les ligands moléculaires utilisés au cours de la synthèse, les nanofils UA peuvent être cultivés de différents supports avec différentes propriétés de surface. Au axée sur les nanofils nanostructures peut aussi être synthétisé en ajustant les paramètres de la réaction.

Synthèse de nanofils Au substrat-bondissent Via un mécanisme de croissance de Surface Active

Advancing synthetic capabilities is important for the development of nanoscience and nanotechnology. The synthesis of nanowires has always been a ...

This time I introduce using for generating one-dimensional nanostructure. The main advantage of this technique is that you can trace nano-wire, a long temperature under mild conditions with simple wet chemistry operations. First in a four-milliliter vial, dissolve 10 milligrams of hydrogen tetrachloroauric trihydrate in one milliliter of deionized water.By PET 0.197 milliliters of this 2.5 millimolar chloroauric acid stock solution into a 50-milliliter round bottom flask equipped with a stir bar. Add 19.7 milliliters of deionized water to the flask and stir to obtain a 0.025-millimolar chloroauric acid solution. Then in another four-milliliter vial, dissolve 10 milligrams of trisodium citrate dihydrate in one milliliter of deionized water.Add 0.147 milliliters of this 0.1-gram-per-milliliter sodium citrate stock solution to the diluted chloroauric acid solution while stirring. Next in a third four-milliliter vial dissolve 2.3 milligrams of sodium borohydride and 0.6 milliliters of deionized water to obtain a 0.1-molar solution which should be used within a few minutes. Ensure that the pale yellow reaction mixture is stirring vigorously.Quickly pipette the sodium borohydride solution into the vigorously stirring mixture which will immediately become bright orange. Continue stirring the mixture for 10 minutes to obtain the gold nanoparticles as indicated by a gradual color change to reddish-orange. The nano articles can be stored for up to a week.To synthesize gold nanowires, first cut a five-milliliter-by-five-milliliter piece from a 0.5 milliliter-thick silicon wafer. Sonicate this substrate for 15 minutes each in deionized water and ethanol in sequence. Wipe off the clean substrate and allow it to dry in air.Then treat the substrate with oxygen plasma at 29.6 watts and 220 volts for 20 minutes. During the plasma treatment, in a 20-milliliter vial, dissolve 11.1 milligrams of APTES in 10 milliliters of a one-to-one by volume mixture of deionized water and ethanol to obtain a 5-millimolar solution. When the plasma treatment has finished, soak the substrate in the APTES solution for 30 minutes.Then thoroughly rinse the substrate with about 20 milliliters each of ethanol and deionized water in sequence. Soak the substrate in the gold nanoparticle solution for two hours to allow the seed nanoparticles to absorb onto its surface. Then prepare 10 milliliters each of a 1.65-millimolar solution of 4-MBA and ethanol.Add 5.10 millimolars solution of chloroauric acid in a one-to-one mixture of deionized water and ethanol Add a 12.3 millimolar solution of L-ascorbic acid in deionized water. Combine 0.5 milliliters each of the chloroauric acid solution and the 4-MBA solution in a 10-milliliter vial. Shake the vial to mix the solutions.Next pick up the seeded substrate with tweezers and wash it with 20 milliliters of deionized water to remove unabsorbed gold nanoparticles. Immerse the seeded substrate in the mixture of chloroauric acid in 4-MBA. Then add 0.5 milliliters of the ascorbic acid solution to the mixture.Gently shake the vial to evenly mix the solutions. Leave the substrate soaking in the mixture undisturbed for 15 minutes. The air ascorbic acid must be added after the mixing of 4-MBA and chloroauric acid otherwise it will cause immediate homogeneous nucleation and the nanowires will not grow.Monitor the formation of bubbles during the growth process. The substrate surface will change from shiny gray to reddish-brown in appearance. Then remove the substrate from the mixture and rinse it with ethanol and deionized water.Allow it to air dry afterwards. The substrate surface will become a golden appearance as it dries. To synthesize gold nanowires with alternating segments of different thicknesses, first seed gold nanoparticles on a silicon substrate as previously described.Also prepare 10 milliliters each of a 1.65-millimolar 4-MBA solution, a 5.10-millimolar chloroauric acid solution, and a 12.3-millimolar ascorbic acid solution as previously described. Then dilute 0.1 milliliters of the 1.6-millimolar 4-MBA solution, 20-fold with ethanol to make two milliliters of a 0.083-millimolar 4-MBA solution. In a 10-milliliter vial, combine 0.5 milliliters each of the 1.65-millimolar solution of 4-MBA, the chloroauric acid solution and the ascorbic solution.Vortex the mixture to form growth solution A.In another 10-milliliter vial, combine 0.5 milliliters each of the 0.083-millimolar solution of 4-MBA, the chloroauric acid, and the ascorbic acid solution. Vortex the mixture to obtain growth solution B.Soak the gold nanoparticle seeded substrate and growth solution B for about one minute. Rapidly transfer the substrate to the container of growth solution A and allow it to soak for two minutes.Repeat the soaking sequence once being careful not to let the substrate dry as it is moved between vials. Finally rinse the substrate with 50 milliliters of ethanol and 50 milliliters of deionized water. Gold nanoparticle with diameters of three to five nanometers, 15 nanometers, and 40 nanometers were all successfully seeded on silicon wafer substrates.Substrate-bound gold nanowires were then grown from these seeds with 4-MBA as the ligand. Gold nanowires were also successfully grown on alumina, strontium titanate, lanthanum aluminate, glass, indium tin oxide, and fluorine-doped tin oxide surfaces. Nanowires with alternating thick-thin segments were grown by alternately immersing the substrate in growth solutions with different ligand concentrations.And nanoflowers were grown by quickly drying the growth solution on the silicon substrate. The nanowire structures could also be changed by varying the ligand. Using 4-MPAA, 2-naphthalenethiol, or 3-MBA as the ligand, yielded ultra-thin nanowires arrays.Using mixtures of 4-MBA and 3-MBA in various proportions yielded tapered nanowires. After watching this video, you should have a good understanding of how to grow growth nanowires from a foreign substrate with at the surface growth mechanism.

Research

JoVE Journal

Chemistry

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Synthèse des dérivés antiviraux tétrahydrocarbazole par photochimique et l&#39;acide catalysée CH fonctionnalisation via intermédiaires peroxydes (CHIPS)

The direct functionalization of C-H bonds is an important and long standing goal in organic chemistry. Such transformations can be very powerful in order ...

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Chimie

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Synthèse, caractérisation et fonctionnalisation des hybrides Au / CdS et Au / ZnS de base / Shell Nanoparticules

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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

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Controlling interfacial tension is an effective method for manipulating the shape, position, and flow of fluids at sub-millimeter length scales, where ...

Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry

Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry

Synthèse des bioconjugués protéiques<em&gt; via</em&gt; Cystéine-maléimide Chemistry

The chemical linking or bioconjugation of proteins to fluorescent dyes, drugs, polymers and other proteins has a broad range of applications, such as the ...

Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition

Croissance épitaxiale de perovskite Strontium Titanate sur Germanium via Atomic Layer Deposition

Atomic layer deposition (ALD) is a commercially utilized deposition method for electronic materials. ALD growth of thin films offers thickness control and ...

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Synthèse de nanofils Platinum-nickel et optimisation des performances de réduction de l’oxygène

Platinum-nickel (Pt-Ni) nanowires were developed as fuel cell electrocatalysts, and were optimized for the performance and durability in the oxygen ...

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

Méthode de précipitation chimique pour la synthèse de Nb2O5 modifiée catalyseurs Nickel en vrac avec le haute surface spécifique

We demonstrate a method for the synthesis of NixNb1-xO catalysts with sponge-like and fold-like nanostructures. By varying the Nb:Ni ratio, a series of ...

A Rapid Synthesis Method for Au, Pd, and Pt Aerogels Via Direct Solution-Based Reduction

Une méthode de synthèse rapide Au, Pd et Pt aérogels par réduction directe axée sur la Solution

Here, a method to synthesize gold, palladium, and platinum aerogels via a rapid, direct solution-based reduction is presented. The combination of various ...

Synthesis of Esters Via a Greener Steglich Esterification in Acetonitrile

Synthèse des Esters Via une estérification de Steglich plus écologique dans l’acétonitrile

The Steglich esterification is a widely-used reaction for the synthesis of esters from carboxylic acids and alcohols. While efficient and mild, the ...

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Synthèse de nanoparticules cylindriques monodispersées par l'auto-assemblage de copolymères de blocs biodégradables

The production of monodisperse cylindrical micelles is a significant challenge in polymer chemistry. Most cylindrical constructs formed from diblock ...