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Abstract
Introduction
Protocol
Results
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Engineering

I Situ Syntese av gull nanopartikler uten Aggregation i folien Space of Layered titanate transparente filmer

Published: January 17, 2017
doi:
10.3791/55169
, , , , ,
1Department of Material Science and Technology, Faculty of Engineering,Niigata University

Summary

Her presenterer vi en protokoll for in situ syntese av gull nanopartikler (AuNPs) innenfor folien løpet av lagdelte titanate filmer uten aggregering av AuNPs. Ingen spektral forandring ble observert selv etter 4 måneder. Den syntetiserte materialet har forventet programmer i katalyse, fotokatalyse, og utvikling av kostnadseffektive Plasmonic enheter.

Abstract

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.

Introduction

Ulike edelmetall-nanopartikler (MNPS) utviser karakteristiske farger eller toner på grunn av deres lokalisert overflate plasmon resonans (LSPR) egenskaper; således kan MNPS brukes i forskjellige optiske og / eller fotokjemiske applikasjoner 1-4. Nylig kombinasjoner av Metal Oxide Semiconductor (MOS) photocatalysts, slik som titandioksid (TiO2) og MNPS, har blitt grundig undersøkt som nye typer photocatalysts 5-14. Men i mange tilfeller er meget små mengder av MNPS finnes på MOS overflaten, fordi de fleste MOS partiklene har relativt lave overflatearealer. På den annen side, lagdelt metalloksyd-halvledere (LMOSs) oppviser fotokatalytiske egenskaper og ha et stort overflateareal, typisk flere hundre kvadratmeter pr enhet g av en LMO 15-17. I tillegg er forskjellige LMOSs ha interkaleringsforbindelser egenskaper (det vil si, kan det anvendes forskjellige kjemiske stoffer innpasses i sine utvidbare og store mellomlag mellomrom) 15-20. Således, med en kombinasjon av MNPS og LMOSs, er det forventet at forholdsvis store mengder MNPS hybridiseres med halvleder photocatalysts.

Vi har rapportert den første in situ syntese av kobber nanopartikler (CuNPs) 21 i folien løpet av LMO (titanoksid nanosheet; TNS 16-30) transparente filmer gjennom svært enkle trinn. Men detaljene i de syntetiske prosedyrer og karakterisering av de andre edle MNPS og TNS hybrider har ennå ikke blitt rapportert. Videre CuNPs innenfor TNS lagene ble lett oksydert og avfarges under omgivelsesbetingelser 21. Som sådan, har vi fokusert på gull nanopartikler (AuNPs), fordi AuNPs er mye brukt til ulike optiske, fotokjemisk, og katalytiske programmer, og det er ventet at de vil være relativt stabil mot oksidasjon 3-5,7,8,10-14 , 28,31,32. Her rapporterer vi syntesen av AuNPs i folien løpet av TNS og showet that 2-ammoniumethanethiol (2-AET + Figur 1 innfelt) fungerer effektivt som en beskyttende reagens for AuNPs innenfor mellomlag av TNS.

Protocol

Forsiktig: Bruk alltid forsiktig når du arbeider med kjemikalier og løsninger. Følg de aktuelle sikkerhetsrutiner og bruk hansker, briller, og en frakk til alle tider. Vær oppmerksom på at nanomaterialer kan ha flere farer i forhold til deres bulk motstykke. 1. Utarbeidelse av Regents Klargjør methyl viologen vandige oppløsning ved å oppløse 0,0012 g av 1,1'-dimetyl-4,4'-bipyridinium-diklorid (metyl viologen; MV 2+) i 20 ml vann for å gi 0,2 mM MV 2+. …

Representative Results

To typer av forløper-filmer ble anvendt i denne studien (dvs. med og uten det beskyttende reagens (2-AET +) inne i mellomsjiktet av TNS). I fravær av 2-AET +, 1,1'-dimetyl-4,4'-bipyridinium-diklorid (metyl viologen; MV 2+) ble anvendt som en ekspander av mellomsjiktet plass, fordi MV 2 + -holdig LMOSs har vært ofte brukt som mellomprodukter ved gjest bytte fremgangsmåte for fremstilling av LMOSs 16,17,21,33-36. <…

Discussion

Dette manuskriptet gir en detaljert protokoll for in situ syntese av gull nanopartikler (AuNPs) innenfor folien løpet av TNS filmer. Dette er den første rapport av in situ syntese av AuNPs innenfor medløperen plass av TNS. Videre fant vi at to-AET + fungerer som en effektiv beskyttende reagens for AuNPs innenfor mellomlag av TNS. Disse metodene hybridiserte AuNPs og TNS transparente filmer. TNS filmer med god optisk gjennomsiktighet 21 ble syntetisert gjennom sintring prosesser…

Disclosures

The authors have nothing to disclose.

Acknowledgements

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).

Materials

Methyl viologen dichloride Aldrich Chemical  Co., Inc. 1910-42-5
Tetrabutylammonium hydroxide TCI T1685
cesium carbonate Kanto Chemical Co., Inc. 07184-33
anatase titanium dixoide Ishihara Sangyo Ltd. ST-01
hydrochloric acid Junsei Chemical Co., Ltd. 20010-0350
sodium hydroxide Junsei Chemical Co., Ltd. 195-13775
Tetrachloroauric(III) acid trihydrate Kanto Chemical Co., Inc. 17044-60
sodium tetrahydroborate Junsei Chemical Co., Ltd. 39245-1210
2-ammoniumethanethiol hydrochloride TCI A0296
Ultrapure water (0.056 µS/cm) Milli-Q water purification system (Direct-Q® 3UV, Millipore)
Microscope slide (Thickness : 1.0∼1.2 mm) Matsunami glass Co., Ltd.
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Tags

Gold NanoparticlesLayered TitanateTransparent FilmsNanostructured HybridsMetal NanoparticlesRadial SemiconductorsPigmentsDyesCatalystsPhotocatalystsNanostructuresIn Situ SynthesisMethyl ViologenTetrachloroauric AcidSodium Borohydride
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Sasaki, K., Matsubara, K., Kawamura, S., Saito, K., Yagi, M., Yui, T. In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films. J. Vis. Exp. (119), e55169, doi:10.3791/55169 (2017).
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