National Undergraduate Physics Conference (NUPC) 2026

Surface-Enhanced Raman Studies of Au-doped MoS2 Nanoparticles prepared by Laser processing

Not scheduled

20m

Indian Institute of Science Education and Research (IISER), Tirupati

Poster Presentation Condensed matter physics

Speaker

VICTOR VIJAYA PREM TATVA CHINTAGUNTI (Department of Physics, GITAM School of Science, GITAM Deemed to be University, Visakhapatnam 530045, Andhra Pradesh, India)

Description

To improve light-matter interactions and surface-enhanced Raman Scattering (SERS) activity via plasmonic effects, Gold (Au) is doped to the MoS2 nanoparticles (NPs). In the first step, Au targets (5 mm 5 mm) are submerged in deionized water and subjected to laser ablation (pulse duration ~4 picosecond, 10 kHz, @1030 nm) to generate Au NPs. In the second step, the Au NPs in deionized water were mixed with MoS2 powder and sonicated well. In the third step, the Au doped MoS2 NPs were fragmented using laser pulses with durations of ~7 nanosecond and ~4 picosecond, after being characterized with a UV-Vis absorption spectrometer, X-ray diffractometer (XRD), and field-emission scanning electron microscope (FESEM). In the final step, the SERS activity of platforms composed of Au-doped MoS2 on crystal violet (CV) at a micromolar concentration (as shown in the figure) was achieved, yielding an enhancement factor of ~10^4.