Page 31 - Book of Invited & Keynotes Talks

th
8 Biannual Conference on Chemistry - CHEM 08

Carbon Nanomaterials: Alternative to Metallic Nanoparticles

for Optical and Electrochemical Sensing Applications
S. Abraham John
Department of Chemistry, Gandhigram Rural Institute
Gandhigram-624 302, Dindigul, Tamilnadu, India

ABSTRACT
The past two decades witnessed plenty of investigations on the optical and

electrochemical sensing applications of metallic nanoparticles, especially
silver and gold. This is mainly due to their size and morphology dependent
optical and electrocatalytic properties. Based on their characteristic surface

plasmon resonance band in the visible region, variety of optical sensors has
been developed. Although optical and electrochemical sensors have been
successfully developed by using silver and gold nanoparticles they have few

limitations like high cost and less stability on long storage. In order to
overcome these limitations, researchers focused their attention recently
towards carbon based nanomaterials especially graphene quantum dots

(GQDs), carbon dots (CDs) and graphene. The CDs/GQDs show interesting
photoluminescence (PL) properties depending upon their size and
functional groups. These materials are considered as excellent alternative

materials to semiconductor quantum dots which are usually composed of
toxic heavy metal core like Te, Cd, Se etc. Our research group has recently
demonstrated that the strong luminescent property of CDs/GQDs can be

utilized for the sensing of biomolecules (Fig.1) and toxic metal ions. Besides,
we have also demonstrated that they can be attached on electrode substrates
for electrochemical sensing applications (Fig.2). The present lecture first

highlights the optical and electrochemical sensing applications of gold
nanoparticles. Then, the synthesis of carbon based nanomaterials and their
optical and electrochemical sensing applications will be discussed. Finally,

dual sensing applications of carbon nanomaterials-meal nanoparticles
composite will be presented.

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BOOK OF INVITED SPEAKERS & KEYNOTES CHEM 08 (2020) Page 31
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