Dispersion Stability, Ligand Structure and Conformation, and SERS Activities of 1-Alkanethiol Functionalized Gold and Silver Nanoparticles

Autor:	Dongmao Zhang, Siyam M. Ansar, Shengli Zou, Stas Dogel, Hooman Hosseinkhannazer, Jose Rodriguez, Manuel Gadogbe, Kumudu Siriwardana, Jane Y. Howe, Willard E. Collier
Rok vydání:	2014
Předmět:	Carbon chain Ligand chemistry.chemical_element Nanoparticle Photochemistry Silver nanoparticle Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chain length General Energy chemistry Decay length Dispersion stability Organic chemistry Physical and Theoretical Chemistry Carbon
Zdroj:	The Journal of Physical Chemistry C. 118:24925-24934
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp507142v
Popis:	Dispersion stability, ligand structure and conformation, and SERS activities of 1-alkanethiol (CnH2n+1SH, n = 2–14) functionalized gold and silver nanoparticles (AuNPs and AgNPs) were studied as a function of alkanethiol carbon chain length and nanoparticle (NP) type and size. The dispersion stability of alkanethiol functionalized NPs in water increases with increasing alkanethiol chain length and NP size, and the stabilities of the alkanethiol-containing AuNPs are higher than their AgNP counterparts. C3H7SH and longer alkanethiols are highly ordered on AgNPs but disordered on AuNPs. The SERS intensity of the C–S stretch band for the model alkanethiols on AgNPs and AuNPs decays exponentially (I = I0 exp(−Nc/N0)) with increasing number of carbon atoms (Nc). The empirical decay length N0, in terms of the number of the carbon atoms, is 1.29, 0.53, and 0.10 for AgNPs with diameters of 50, 30, and 10 nm, respectively. This decay length is less than 1 for AuNPs of difference sizes. These results show that chang...
Databáze:	OpenAIRE
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