G S HARISH

@dteap.nic.in

Lecturer in Physics, Government Polytechnic, Pillaripattu
Department of Technical Education



           

https://researchid.co/harishgs2012

EDUCATION

PhD in PHYSICS, from S.V.University, Tirupati.

RESEARCH INTERESTS

Nanomaterials

4

Scopus Publications

Scopus Publications

  • Synthesis and Properties of Eu and Ni Co-Doped ZnS Nanoparticles for the Detection of Ammonia Gas
    Murali Ankinapalli, Harish G. S., Gopi Krishna Kurugundla, Charan Kuchi, Sowjanya Munga, and P. Sreedhara Reddy
    The Electrochemical Society
    Zinc sulfide nanoparticles were synthesized successfully via chemical co-precipitation, both in undoped form and co-doped with Europium (Eu) and Nickel (Ni). All prepared samples exhibited cubic zinc blende structure as confirmed by X-ray diffraction (XRD). The average particle size ranged from 3 to 6 nm for both pure and (Eu, Ni) co-doped ZnS, with no alteration in the crystal structure due to Eu and Ni co-doping. However, increasing the Ni dopant concentration (0, 2, 4, & 6 at%) while maintaining a constant Eu concentration (4 at%) led to an enhancement in the crystallite size. This was further validated by transmission electron microscopy (TEM), which showed particle sizes consistent with the XRD findings (3–5 nm). Microscopic analysis via scanning electron microscopy and TEM revealed spherical agglomerated morphology for the (Eu, Ni) co-doped nanoparticles. Energy-dispersive X-ray spectroscopy spectra confirmed the stoichiometric chemical composition of ZnS: Eu, Ni. Photoluminescence studies demonstrated an increased intensity of green luminescence at 6 at% Ni co-dopant concentration. Moreover, the synthesized samples exhibited promising gas sensing properties, particularly towards ammonia gas, with good selectivity. Notably, both pure and (Eu, Ni) co-doped ZnS nanoparticles showed rapid response and recovery times at room temperature, suggesting their potential applicability in gas sensing applications.


  • Synthesis and characterization of Ce, Cu co-doped ZnS nanoparticles
    G.S. Harish and P. Sreedhara Reddy
    Elsevier BV

  • Structural, compositional and Raman studies of ZnS: Ce, Cu co-doped nanoparticles
    G. S. Harish and P. Sreedhara Reddy
    AIP
    In this present work, Ce, Cu co-doped ZnS nanoparticles were prepared at room temperature using chemical precipitation method. The prepared nanoparticles were characterized by X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy dispersive analysis of X-rays (EDAX) and High Resolution Raman spectroscopic techniques. X-ray diffraction studies show that the diameter of the particles is 2-4 nm. Broadened XRD peaks confirmed the formation of nanoparticles with face centered cubic (FCC) structure. SEM attached with EDS gave the size, morphology and compositional analysis of as-prepared material. The Raman spectra of unplanted and Cu, Ce ions implanted samples of nano structured ZnS showed LO mode and TO mode. Compared with the Raman modes (276 and 351 cm−1) of undoped ZnS nanoparticles, the Raman modes of Ce, Cu co-doped ZnS nanoparticles are slightly shifted towards lower frequency side.