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

  • Pooja Devi
  • Pramod Reddy
  • Swati Arora
  • Suman Singh
  • C. Ghanshyam
  • M. L. SinglaEmail author
Research Paper

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.

Keywords

Core/shell nanostructures Modified electrode Electrochemical sensor Nitrobenzene 

Notes

Acknowledgments

The authors are thankful to Dr. Pawan Kapur, Director, CSIO-CSIR, for his valuable support.

Supplementary material

11051_2012_1172_MOESM1_ESM.doc (1.6 mb)
Supplementary material 1 (DOC 1633 kb)

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Pooja Devi
    • 1
  • Pramod Reddy
    • 1
  • Swati Arora
    • 2
  • Suman Singh
    • 1
  • C. Ghanshyam
    • 1
  • M. L. Singla
    • 1
    Email author
  1. 1.Central Scientific Instruments OrganizationCSIR, Sector-30CChandigarhIndia
  2. 2.Shri Mata Vaishno Devi UniversityKatraIndia

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