Surface modification of gold nanoparticles and their monolayer behavior at the air/water interface

Chaio Ling Hsu, Ke Hsuan Wang, Chien-Hsiang Chang, Wen Ping Hsu, Yuh-Lang Lee

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Gold nanoparticles were prepared by two different methods. The first method was chemically grafting the particles with different lengths of alkylthiol (C 6 SH, C 12 SH and C 18 SH). For the second method, the Au particles were surface modified first by mercaptosuccinic acid (MSA) to render a surface with carboxylic acid groups which play a role to physically adsorb cationic surfactant in chloroform. This method was termed physical/chemical method. In the first method, the effects of alkyl chain length and dispersion solvent on the monolayer behavior of surface modified gold nanoparticles was evaluated. The gold nanoparticles prepared by 1-hexanthiol demonstrated the narrowest size distribution. Most of them showed narrower particle size distributions in chloroform than in hexane. For the physical/chemical method, the particles can spread more uniformly on the water surface which is attributed to the amphiphilic character of the particles at the air/water interface. However, the particles cannot pack closely due to the relatively weak particle-particle interaction. The effect of alkyl chain length was also assessed for the second method.

Original languageEnglish
Pages (from-to)2756-2763
Number of pages8
JournalApplied Surface Science
Volume257
Issue number7
DOIs
Publication statusPublished - 2011 Jan 1

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Gold
Surface treatment
Monolayers
Nanoparticles
Water
Chloroform
Chlorine compounds
Air
Chain length
Particle interactions
Cationic surfactants
Hexanes
Carboxylic Acids
Hexane
Carboxylic acids
Particle size analysis
Acids

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

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Surface modification of gold nanoparticles and their monolayer behavior at the air/water interface. / Hsu, Chaio Ling; Wang, Ke Hsuan; Chang, Chien-Hsiang; Hsu, Wen Ping; Lee, Yuh-Lang.

In: Applied Surface Science, Vol. 257, No. 7, 01.01.2011, p. 2756-2763.

Research output: Contribution to journalArticle

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