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4th Edition of International Conference on

Materials Science and Engineering

March 13-15, 2023 | Singapore

Materials 2023

Simultaneous enhancement of electrical conductivity and magenetization in graphene using silver nanoparticles

Speaker at Materials Science and Engineering 2023 - Prajwal Chettri
Salesian College, India
Title : Simultaneous enhancement of electrical conductivity and magenetization in graphene using silver nanoparticles

Abstract:

We report the effects of silver nanoparticles (Ag-NP) on magnetic and electrical properties of reduced graphene oxide (rGO). The morphological features of the composite (Ag-rGO) examined using ambient-scanning tunneling microscope (STM) show presence of atomic scale ripples and lattice defects. Unlike rGO (2.4 Å), increased atomic spacing (4.2 Å) is observed in Ag-rGO, indicating presence of strain induced regions in these samples. Magnetization studies reveal presence of mixed magnetism in graphene oxide (GO), rGO and Ag-rGO samples where GO and Ag-rGO is primarily paramagnetic while rGO is diamagnetic. With the introduction of Ag-NP in rGO, the magnetization increases by several folds and exhibits weak hysteresis owing to the presence of dense defects. In Ag-rGO maximum magnetization is obtained with the threshold concentration of 1 mM of silver nitrate (AgNO3) used for the synthesis. However, on increasing AgNO3 concentration magnetization cannot be enhanced due to increased presence of C-O-C group in Ag-rGO. Current-voltage (I-V) curves show transition from non-ohmic GO to ohmic rGO. In Ag-rGO, resistance decreases by at least four hundred times as compared to that of rGO and emerges as n-type doped. By increasing the concentration of Ag-NP further, rGO becomes susceptible to defects and loses its conductive nature. These findings are corroborated utilizing Raman peak profile and STM images of the samples. This work shades light on feasibility to fabricate magnetic metal NP-rGO composite without compromising its electrical conductivity

Biography:

Dr. Chettri obtained his PhD (Physics) from Central University of Sikkim, India in 2020. He then worked as a Postdoctoral Project Fellow for six months. Currently he is serving as Head of the Department at the department of Physics, Salsesian College, Siliguri, India. His research area includes two dimensional materials, nanomaterial composites and their applications as plasmonic sensors.

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