Name: visible-light induced reduction of graphene oxide using plasmonic nanoparticle
Uploaded: 2015-09-22T16:00:00
Description: Watch this Scientific Journal Video about Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle at JoVE.com

Dette arbejde blev støttet af Grundforskningsfonden Korea (2013R1A1A1061387) og KU-KIST forskningsfond.

1. Fremstilling af precursor <ol><li> Udarbejdelse af graphene oxid (GO): <ol><li> GO forberedelse hjælp modificerede Hummer metode 14 <ol><li> Tilføj 3,0 g grafitflager til en blanding af koncentreret H 2 SO 4 / H 3 PO 4 (360: 40 ml) ved stuetemperatur. (Bemærk: Særlig omhu skal tages, mens du bruger stærke syrer H 2 SO 4 og H 3 PO 4.) </li><li> Tilføj KMnO 4 (18,0 g) langsomt under omrøring og afkøling i et isbad til at o...

<ol>
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Synligt lys bestråling på GO opløsning i 30 minutter med guld nanopartikler (AuNPs, AuNSs &amp; AuNRs) viste de hurtige farveændringer fra lysegul-brun til sort farve (figur 1). For at opnå meget rent R-GO produkt i højt udbytte, er der to vigtige faktorer skal følge. Den ene er anvendelsen af AuNPs som en effektiv katalysator plasmoniske, da AuNPs kraftigt kan absorbere synligt lys blandt andre strukturer (dvs., AuNRs, AuNSs). En anden er anvendelsen af ​​nanostørrelse GO opløsnin...

<html> Den første udviklede Scotch-tape metode 1 og kemisk dampaflejring 2 var fremragende metoder til at producere den uberørte tilstand af en graphene, men i stor skala graphene syntese eller graphene lagdannelse på overfladen med bredt område er blevet betragtet som en vigtig begrænsning af tidligere fremgangsmåder. 3 En af mulig løsning til store r-GO syntese vil være våd-kemiske syntesemetode som først kræver reaktionerne med stærke oxidationsmidler, omfattende fysisk behandling såsom sonikering at producere GO ark, og endelig reduktionen af oxygen funktionaliteter sådanne som hydroxy, epoxid og carbonylgrupper i GO er afgørende for at genvinde sin oprindelige fysiske egenskaber. 4 meste blev reduktionen af GO udføres med enten kemisk metode under anvendelse af hydrazin eller dets derivater 5 eller ved termisk behandlingsmetode (550-1,100 ° C) i et inert eller reducerende atmosfære. 6 jove_content &quot;&gt; Disse processer kræver de giftige kemikalier, lange reaktionstid og høj temperatur, som øgede den samlede energibehov for r-GO-syntese. 7. Mens foto-bestråling af reduktion processer såsom UV-induceret, 8 foto-termisk proces ved hjælp af en pulserende xenon flash, 9 pulserende laser assisteret 10 og foto-termisk opvarmning med kamera flash lys 11 er også blevet rapporteret for udarbejdelsen af r-GO. Generelt er den lave virkningsgrad på foto-inducerede metoder udbredes til brugen af UV eller pulserende laser bestråling, der kan levere høj fotonenergi. Den lave fotonenergi af synligt lys begrænser dets anvendelse og ikke tiltrukket meget for r-GO-syntese. Fremragende lys absorption egenskaber af plasmoniske nanopartikler i de synlige og / eller NIR-regioner kan i høj grad forbedre de nuværende ulemper af anvendelsen af synligt lys for r-GO-syntese. 12,13 milde reaktionsbetingelser, kort reaktionstid og begrænset anvendelse af giftige lmemicals kunne gøre det synlige lys inducerede plasmon bistået fotokatalytisk reduktion af GO som en nyttig alternativ metode. I foreliggende fremgangsmåde beskriver vi en effektiv og enkel r-GO syntesemetode ved anvendelse plasmoniske nanopartikler og synligt lys. Reaktionsforløbet blev fundet at være stærkt afhængig af strukturerne af plasmoniske nanopartikler såsom sfæriske guld nanopartikler (AuNPs), guld nanorods (AuNRs), og guld nanostars (AuNSs). Anvendelsen af AuNPs viste den mest effektive reduktion af GO og nanopartiklerne er let aftagelige og genanvendelige til gentagen brug (figur 1). R-GO syntetiseres under anvendelse af synligt lys og AuNPs viste næsten lige kvalitet sammenlignet med r-GO fremstilles ved velkendte kemiske metode (hydrazin) som påvist ved anvendelse af forskellige analytiske målinger og fluorescens quenching / nyttiggørelse baseret DNA påvisningsmetode.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>Cy3 modifeid ssDNA</td>
			<td>IDT(Iowa, USA)</td>
			<td></td>
			<td>HPLC purified by IDT</td>
		</tr>
		<tr>
			<td>Gold nanoparticles (30 nm)</td>
			<td>Ted Pella, Inc(Redding, CA, USA).</td>
			<td>15706-20</td>
			<td>colloidal solution</td>
		</tr>
		<tr>
			<td>4-(2-hydroxyethyl)-1-piperazineethane sulfonic acid (HEPES) (99.5%)</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>7365-45-9</td>
			<td></td>
		</tr>
		<tr>
			<td>Gold(III)Chloride Hydrate (99.999%)</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>&#160;27988-77-8</td>
			<td>strongly hygroscopic</td>
		</tr>
		<tr>
			<td>Sodium Borohydride (99.99%)</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>16940-66-2</td>
			<td></td>
		</tr>
		<tr>
			<td>Hexadecyltrimethylammonium bromide (&#8805;99%)</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>57-09-0</td>
			<td></td>
		</tr>
		<tr>
			<td>L-Ascorbic Acid(&#8805;99.0%)</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>50-81-7</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium Chloride (99.5%)</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>7647-14-5</td>
			<td></td>
		</tr>
		<tr>
			<td>Silver Nitrate&#160; (&#8805;99.0%)</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>7761-88-8</td>
			<td></td>
		</tr>
		<tr>
			<td>Graphite</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>7782-42-5</td>
			<td></td>
		</tr>
		<tr>
			<td>Sulfuric acid</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>7664-93-9</td>
			<td></td>
		</tr>
		<tr>
			<td>Phophoric acid</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>7664-38-2</td>
			<td></td>
		</tr>
		<tr>
			<td>Potassium permanganate</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>7722-64-7</td>
			<td></td>
		</tr>
		<tr>
			<td>Hydrogen peroxide</td>
			<td>JUNSEI</td>
			<td>23150-0350</td>
			<td></td>
		</tr>
		<tr>
			<td>Ammonium hydroxide</td>
			<td>Sigma-Aldrich (St. Louis, MO, USA)</td>
			<td>1336-21-6</td>
			<td></td>
		</tr>
		<tr>
			<td>Xe-lamp</td>
			<td>&#160;Cermax, Waltham, USA</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>NIR Laser</td>
			<td>Class-IV, Sanctity Laser, Shanghai, China&#160;</td>
			<td></td>
			<td>6W (output power)</td>
		</tr>
		<tr>
			<td>UV-Vis spectrophotometer&#160;</td>
			<td>S-3100, SINCO, South Korea</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Transmission Electron Microscopy</td>
			<td>H-7650, Hitachi, Japan</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Spectro Fluorometer</td>
			<td>Jasco FP-6500, Tokyo, Japan</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>X-ray Photoelectron Spectrometer</td>
			<td>AXIS&#8211;NOVA, KRATOS Inc., UK</td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

visible-light induced reduction of graphene oxide using plasmonic nanoparticle

Foreliggende arbejde viser den enkle, kemisk fri, hurtig og energieffektiv metode til at producere reduceret graphene oxid (r-GO) opløsning ved stuetemperatur under anvendelse af synligt lys bestråling med plasmoniske nanopartikler. Den plasmoniske nanopartikel bruges til at forbedre reduktionen effektivitet GO. Det tager kun 30 minutter ved stuetemperatur ved at belyse opløsningerne med Xe-lampe, kan R-GO løsninger opnås ved helt at fjerne guld nanopartikler ved simpel centrifugeringstrin. De sfæriske guld nanopartikler (AuNPs) sammenlignet med de andre nanostrukturer er den mest velegnede plasmoniske nanostruktur for r-GO forberedelse. Den reducerede graphene oxid fremstillet under anvendelse af synligt lys og AuNPs var lige så kvalitativt som kemisk reduceret graphene oxid, som blev støttet af forskellige analytiske teknikker såsom UV-Vis spektroskopi, Raman spektroskopi, pulver XRD og XPS. Den reducerede graphene oxid forberedt med synligt lys viser fremragende quenching egenskaber over fluorescent molekyler ændret ssDNA og fremragende fluorescens opsving for mål-DNA påvisning. R-GO fremstilles ved genvundne AuNPs findes at være af samme kvalitet med den af ​​kemisk reduceret r-GO. Anvendelsen af ​​synligt lys med plasmoniske nanopartikel viser godt alternativ metode til r-GO syntese.

Figur 1 viser den samlede ordning for synligt lys og plasmoniske nanopartikel baserede r-GO reduktionsreaktion. Figur 2 viser den instrumentelle setup for reaktionerne. Efter reaktion er det nødvendigt centrifugeringstrinnet at fjerne den brugte photocatalyst (AuNSs, AuNRs eller AuNPs) som vist i figur 3A. Den HRTEM analyse viser fuldstændig fjernelse af nanopartikler i supernatanten (r-GO) (figur 3B), som også er muligt at bekræfte med UV-Visible a...

Watch this Scientific Journal Video about Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle at JoVE.com

Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle

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Present work demonstrates the simple, chemical free, fast, and energy efficient method to produce reduced graphene oxide (r-GO) solution at RT using ...

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A facile, controllable, inexpensive and green electrochemical synthesis of IrO2-graphene nanohybrid thin films is developed to fabricate an easy-to-use ...

Preparation of ZnO Nanorod/Graphene/ZnO Nanorod Epitaxial Double Heterostructure for Piezoelectrical Nanogenerator by Using Preheating Hydrothermal

Udarbejdelse af ZnO nanorod / Graphene / ZnO nanorod Epitaksial Dobbelt heterostruktur til piezoelektriske Nanogenerator ved hjælp Forvarmning Hydrotermisk

Well-aligned ZnO nanostructures have been intensively studied over the last decade for remarkable physical properties and enormous applications. Here, we ...

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Avanceret analyse af sammensætningen af ​​nanopartiklers-polymer Composites Brug Direct Fluorescens Imaging

The fabrication of polymer-nanoparticle composites is extremely important in the development of many functional materials. Identifying the precise ...

Testing of Nanoparticle Release from a Composite Containing Nanomaterial Using a Chamber System

Test af Nanopartikel Frigivelse fra et Composite indeholdende nanomateriale Brug en afdeling System

With the rapid development of nanotechnology as one of the most important technologies in the 21st century, interest in the safety of consumer products ...