Abstract
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 (C 1, I P) 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.
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The authors are thankful to Dr. Pawan Kapur, Director, CSIO-CSIR, for his valuable support.
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Pooja Devi and Pramod Reddy contributed equally to this work.
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Devi, P., Reddy, P., Arora, S. et al. Sensing behavior study of silica-coated Ag nanoparticles deposited on glassy carbon toward nitrobenzene. J Nanopart Res 14, 1172 (2012). https://doi.org/10.1007/s11051-012-1172-2
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DOI: https://doi.org/10.1007/s11051-012-1172-2