Abstract:
In this work, we propose a new, robust and reliable way to detect H2O2. Reduced graphene
oxide-supported tin oxide (SnO2-rGO) as electrochemical sensing material has been synthesized
and drop cased on pencil graphite electrode (PGE) for the detection of H2O2. Electrochemical
characterization has been done using cyclic voltammetry (CV) and amperometry. Hydrothermal
synthesis method was used for the fabrication of SnO2 nanoparticles and GO prepared by
modified Hummers method. For the detection of H2O2, the nanoparticles were mixed with
Nafion and chitosan before drop coating onto the PGE surface. In this work, we have found a
good catalytic activity of SnO2-rGO modified 3B PGE at pH 7.4. Electrochemical studies
showed that the sensing platform fabricated using SnO2-rGO possesses fast mass transport, good
electrical conductivity and high sensitivity and selectivity for the detection of H2O2. SnO2-
GO/PGE exhibited amperometric sensitivity of 53.4 μAmM−1cm-2 with a response time 2s, limit
of detection of 0.09μM (n=3), and linearity range of 1-7 mM. The electrode can be prepared
simply and at low cost, and present a promising tool for sensing H2O2.
Description:
This thesis is submitted to the Department of Chemistry, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Chemistry, June 2018.
Cataloged from PDF Version of Thesis.
Includes bibliographical references (pages 70-78).
