KURUGUNDLA GOPI KRISHNA
@cmrtc.ac.in
Assistant Professor of Physics
CMR TECHNICAL CAMPUS
RESEARCH, TEACHING, or OTHER INTERESTS
Materials Science, Biomaterials, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
S. Gajarajan, Charan Kuchi, A. Obula Reddy, K. Gopi Krishna, K. Sunil Kumar, Bodicherla Naresh, and P. Sreedhara Reddy
Elsevier BV
E. Praveen Kumar, N. Chanakya, Ayesha Siddiqua, Kurugundla Gopi Krishna, B. Vijaya Kumar, P. Muralikrishna, and G. Upender
Elsevier BV
Ruchika Thayil, Kurugundla Gopi Krishna, Sudhir Cherukulappurath, Velavan Kathirvelu, and Saidi Reddy Parne
Elsevier BV
S. L. Bhise, L. H. Kathwate, G. Umadevi, K. G. Krishna, V. D. Mote, and B. N. Dole
Springer Science and Business Media LLC
Kurugundla Gopi Krishna, Saidi Reddy Parne, and P. Nagaraju
Elsevier BV
Kurugundla Gopi Krishna, Saidi Reddy Parne, and P. Nagaraju
The Electrochemical Society
The current study delineates the role of gas sensing properties of Fe-IZO (Iron loaded Indium Zinc oxide) a mixed metal oxide nanocomposite. The heterostructured Fe-IZO nanocomposite (NC) was synthesized via the facile co-precipitation method. The Fe-IZO NC was characterized by various experimental techniques and the results attained allowed us to suggest the mechanism for considering the connection between morphological variations and gas-sensing characteristics of Fe-IZO NC. One of the cutting-edge circumstances now-a-days is the prime use of gas sensors for environmental applications. The NC has a good selectivity for NH3 gas that has shown good stability up to 80 d. The response time (ℸres) is 64 s, recovery time (ℸrec) is 72 s for 50 ppm (parts per million) and obtained a highest response of 87% at room temperature. The Fe-IZO NC heterostructure with efficient charge transfer can enable the subsequent reaction mechanism with NH3 gas and the adsorbed oxygen ions leading to an increased response. Consequently, the results attained in this work has shown that the synthesized heterostructured NC sensor is suitable for room temperature NH3 sensing with high performance.
D. Rajasekhar, Bodicherla Naresh, V. Madhavi, Kurugundla Gopi Krishna, Charan Kuchi, K. Sunil Kumar, and P. Sreedhara Reddy
Elsevier BV
Kurugundla Gopi Krishna, Saidi Reddy Parne, and P. Nagaraju
Elsevier BV
Kurugundla Gopi Krishna, Saidi Reddy Parne, and Nagaraju Pothukanuri
IOP Publishing
Abstract To protect human health from hazardous gases, it is necessary to rapid detection of toxic gases utilizing gas sensors. Though there are various gas sensors, despite that, they endure inaccuracy in selectivity and sensitivity in the real-time monitoring of the low concentration of gases. In this context, the practical design for developing a cost-effective formaldehyde (HCHO) sensor using a hetero-type ternary nanocomposite ZnO/CdO/CuO (ZCCO) metal oxide (MOX) materials with porous structure is an ideal choice. In this study, ZCCO heterostructures demonstrated rapid selectivity towards HCHO compared with other volatile organic compounds and exhibited excellent long-term stability for up to 80 d. The sensor capability has been further improved with the heterostructures’ porous morphology, greater specific surface area, huge reaction sites, and electron sensitization effects of highly dispersed nanocomposite material. This work reports the Lowest Detection Limit (LDL) towards HCHO at room temperature as 250 ppb. These heterostructures enable the charge transport mechanism between the interparticle ZnO/CdO (n–n junctions) and the ZnO/CuO (n–p junctions) that can simultaneously enhance the sensitivity of the gas molecule’s reactions.
Kurugundla Gopi Krishna, Saidi Reddy Parne, and P. Nagaraju
Springer Science and Business Media LLC
Bodicherla Naresh, Kurugundla Gopi Krishna, Rajasekhar D, Charan Kuchi, Sunil Kumar Kummara, and P. Sreedhara Reddy
Elsevier BV
Kurugundla Gopi Krishna, Godavarti Umadevi, Saidireddy Parne, and Nagaraju Pothukanuri
Royal Society of Chemistry (RSC)
The most extensively explored gas sensors are metal oxide semiconductor (MOS) materials owing to their high selectivity, stability, cost-effectiveness, and simple synthesis techniques.
Mohan Reddy Pallavolu, Kurugundla Gopi Krishna, Goli Nagaraju, P.S. Srinivasa Babu, Sangaraju Sambasivam, and Adem Sreedhar
Elsevier BV
Kurugundla Gopi Krishna, Saidireddy Parne, Nagaraju Pothukanuri, Velavan Kathirvelu, Suman Gandi, and Dhananjay Joshi
Elsevier BV
L. Krishna Bharat, Soo-Kun Jeon, Kurugundla Gopi Krishna, and Jae Su Yu
Springer Science and Business Media LLC
AbstractThe commercially available white-light-emitting diodes (WLEDs) are made with a combination of blue LEDs and yellow phosphors. These types of WLEDs lack certain properties which make them meagerly applicable for general illumination and flat panel displays. The solution for such problem is to use near-ultraviolet (NUV) chips as an excitation source because of their high excitation efficiency and good spectral distribution. Therefore, there is an active search for new phosphor materials which can be effectively excited within the NUV wavelength range (350–420 nm). In this work, novel rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors were synthesized by a citrate assisted sol-gel method at low calcination temperatures. Optical properties, internal quantum efficiency and thermal stability as well as morphology and crystal structure of Ca2KZn2(VO4)3 phosphors for their application to NUV-based WLEDs were studied. The crystal structure and phase formation were confirmed with XRD patterns and Rietveld refinement. The optical properties of these phosphor materials which can change the NUV excitation into visible yellow-green emissions were studied. The synthesized phosphors were then coated onto the surface of a NUV chip along with a blue phosphor (LiCaPO4:Eu2+) to get brighter WLEDs with a color rendering index of 94.8 and a correlated color temperature of 8549 K.
Kurugundla Gopi Krishna, L. Krishna Bharat, and Jae Su Yu
Elsevier BV
L. Krishna Bharat, Kurugundla Gopi Krishna, and Jae Su Yu
Elsevier BV
L. Krishna Bharat, Goli Nagaraju, Kurugundla Gopi Krishna, and Jae Su Yu
Royal Society of Chemistry (RSC)
Spherical yttrium gallium garnet (Y3Ga5O12) samples were prepared by a single-step hydrothermal synthesis method, and these particles were coated with silver oxide (Ag2O) nanoparticles by following a facile wet chemical approach at ambient temperature. The structural, morphological, vibrational and optical properties of the as-prepared and Ag2O modified Y3Ga5O12 samples were analyzed. From Rietveld refinement of X-ray diffraction patterns, the crystal structure of the Y3Ga5O12 sample was refined. The morphological properties confirmed that the particles were spherical and their surfaces were covered with Ag2O nanoparticles. The Ag2O modified Y3Ga5O12 sample exhibited a relatively enhanced photocatalytic activity compared to the pure Y3Ga5O12 sample in Rhodamine B solution, suggesting that the introduction of Ag2O broadens the absorption of light and controls the photogenerated carrier recombination in Y3Ga5O12. These results provide a clear perspective on the synthesis of hybrid photocatalyst materials which have several ways of photogenerated carrier migration.