Effect of Bonding Interactions between Arsenate and Silver Nanofilm on Surface-Enhanced Raman Scattering Sensitivity | Zendy

Zhonghou Xu | Zendy; Chuanyong Jing | Zendy; Jumin Hao | Zendy; Christos Christodoulatos | Zendy; George P. Korfiatis | Zendy; Fasheng Li | Zendy; Xiaoguang Meng | Zendy

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Effect of Bonding Interactions between Arsenate and Silver Nanofilm on Surface-Enhanced Raman Scattering Sensitivity

Author(s) -

Zhonghou Xu,

Chuanyong Jing,

Jumin Hao,

Christos Christodoulatos,

George P. Korfiatis,

Fasheng Li,

Xiaoguang Meng

Publication year - 2011

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/jp2088669

Subject(s) - arsenate , raman scattering , adsorption , raman spectroscopy , ternary operation , extended x ray absorption fine structure , chemistry , absorption (acoustics) , analytical chemistry (journal) , substrate (aquarium) , crystallography , materials science , absorption spectroscopy , arsenic , organic chemistry , physics , optics , oceanography , quantum mechanics , computer science , composite material , programming language , geology

The effect of Ca2+ on surface-enhanced Raman scattering (SERS) analysis of arsenate (As(V)) using Ag nanofilm was studied. Extended X-ray absorption fine structure (EXAFS) was used for the first time to investigate the bonding structures of adsorbed As(V) on the SERS substrate, as well as the mechanism of the Ca2+ effect on the SERS analysis of As(V). As(V) was found to be adsorbed on Ag nanofilm through formation of bidentate binuclear surface complexes (AgO)2AsO2– with an average As–Ag interatomic distance of 2.56 A in the As(V) single adsorbate system, and through formation of a ternary surface complex (AgO)(CaO)2AsO+ with an average As–Ag distance of 3.03 A in the presence of Ca2+. The formation of the ternary surface complex dramatically decreased the SERS sensitivity and resulted in a shift of the SERS As(V) band from 780 cm–1 for the As(V) system to 790 cm–1 in the As(V)–Ca2+ binary adsorbate system. It was discovered that the negative effect of Ca2+ and Mg2+ was reduced dramatically by addition of...

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