Sensing behavior study of silica-coated Ag nanoparticles deposited on glassy carbon toward nitrobenzene

Devi, Pooja and Reddy, Pramod and Arora, Swati and Singh, Suman and Ghanshyam, C. and Singla, M.L. (2012) Sensing behavior study of silica-coated Ag nanoparticles deposited on glassy carbon toward nitrobenzene. Journal of Nanoparticle Research, 14 (10). pp. 1-8. ISSN 1388-0764 (print) 1572-896X (online)

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In this study, we report the synthesis and characterization of silica-coated silver core/shell nanostructures (NSs) and their sensing behavior when deposited on glassy carbon (GC) electrode for nitrobenzene (NB) detection. Synthesized silica-coated silver core/shell NSs were characterized for their chemical, structural and morphological properties. TEM analysis confirmed that the silica-coated silver nanoparticles (size *200 nm) are spherical in shape and the core diameter is *38 nm. FT-IR spectra also confirmed the coating of silica on the surface of silver nanoparticles. Cyclic voltammetry studies of NB with silica-coated silver core–shell nanoparticles-modified GC electrodes revealed two cathodic peaks at -0.74 V (C1) and -0.34 V (C2) along with two anodic peaks at -0.64 V (A1) and -0.2 V (A2). Enhanced cathodic peak current (C1, IP) of the core– shell NSs-modified electrode is observed relative to bare and silica-modified electrodes. Amperometric studies revealed a very high current sensitivity (114 nA/nM) and linearly dependent reduction current with NB amount in the low concentration range and a detection limit of 25 nM. Moreover, the core–shell NSs-modified electrode showed good reproducibility and selectivity toward NB in the presence of many cationic, anionic, and organic interferents.

Item Type: Article
Uncontrolled Keywords: Core/shell nanostructures; Modified electrode; Electrochemical sensor; Nitrobenzene
Subjects: CSIO > Chemistry
Divisions: Agri - Instrumentation
Depositing User: Ms. J Shrivastav
Date Deposited: 25 Feb 2013 06:04
Last Modified: 25 Feb 2013 06:04

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