Controlled interparticle spacing for surface-modified gold nanoparticle aggregates

Langmuir : the ACS Journal of Surfaces and Colloids
Soumen BasuTarasankar Pal

Abstract

Aggregation of gold nanoparticles of increasing size has been studied as a consequence of adsorption of 2-aminothiophenol (ATP) on gold nanoparticle surfaces. The capping property of ATP in the acidic pH range has been accounted from UV-vis absorption spectroscopy and surface-enhanced Raman scattering (SERS) studies. The effect of nanoparticle size (8-55 nm) on the nature of aggregation as well as the variation in the optical response due to variable degree of interparticle coupling effects among the gold particles have been critically examined. Various techniques such as transmission electron microscopy, X-ray diffraction, zeta-potential, and average particle size measurement were undertaken to characterize the nanoparticle aggregates. The aggregate size, interparticle distances, and absorption band wavelengths were found to be highly dependent on the pH of the medium and the concentration of the capping agent, ATP. The acquired SERS spectra of ATP relate the interparticle spacing. It has been observed that the SERS signal intensities are different for different sized gold nanoparticles.

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Citations

May 19, 2009·Journal of the American Society for Mass Spectrometry·Jicheng DuanQuan J Cheng
Oct 30, 2010·Chemical Communications : Chem Comm·Baohua ZhangHongqiang Wang
Feb 20, 2013·The Analyst·Yuling Wang, Sebastian Schlücker
Mar 8, 2013·Nanoscale·Elisabetta FanizzaM Lucia Curri
Dec 12, 2012·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·S L Smitha, K G Gopchandran
Jul 26, 2011·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Haibo QiYuan Tian
Aug 20, 2011·Journal of Colloid and Interface Science·Neha ChauhanRenu Pasricha
Aug 7, 2010·Colloids and Surfaces. B, Biointerfaces·Chunyuan SongYiping Cui
May 14, 2013·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Sourov ChandraArunava Goswami
Nov 5, 2020·Nanoscale·Ming LiNianqiang Wu
Sep 24, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Lin ZhuZhenxin Wang
Jun 4, 2010·Journal of the American Chemical Society·Min Suk ShimYoung Jik Kwon
Aug 26, 2010·ACS Applied Materials & Interfaces·Marcel LucasKirk D Rector
Nov 4, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Jung Su ParkSangwoon Yoon
Jul 1, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Weinan Leng, Peter J Vikesland

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