Synthesis and characterization of p-CuO/n-ZnO heterostructured composite thin films for the detection of formaldehyde gas Sarika Yadav, P Nagaraju, Sameena Begum, M Swathi, Kurugundla Gopi Krishna, J K Ojha, G R Turpu Journal of Physics Condensed Matter, 2025 We report the synthesis and characterization of pure CuO and CuO–ZnO nanostructured composite thin films sprayed on particle-free glass substrates using chemical spray pyrolysis method. The films were systematically analyzed through microstructural, morphological, chemical, and gas-sensing studies. X-ray diffraction (XRD) studies confirmed the polycrystalline nature of the films, with a predominant monoclinic phase along the (002) direction. Key structural parameters, such as crystallite size, dislocation density, strain, and the number of crystallites per unit area, were reported from XRD analysis. Field emission scanning electron microscopy revealed a bundled-like morphology witha uniform particle distribution, enhancing the surface area for effective gas interaction. X-ray photoelectron spectroscopy results indicated that Cu and Zn ions existed predominantly in the 2+ oxidation state, contributing to the films’ reactivity. Significantly, the gas sensing studies were investigated with static liquid distribution method, highlighting the remarkable performance of the 30 wt.% CuO–ZnO composite thin film. This composite exhibited a substantial response to 5 ppm formaldehyde at ambient conditions, showing a recovery time of 22 s and a response time of 15 s. These findings underscore the potential of CuO–ZnO composites for efficient formaldehyde gas sensing applications, marking a notable advancement in the field of environmental monitoring.
Optimized n-Butanol Sensing Performance of ZnCeO2 and ZnCuCeO2 Nanocomposites at Room Temperature Kurugundla Gopi Krishna, Saidi Reddy Parne, Nagaraju P, Damodar Reddy Edla Ecs Journal of Solid State Science and Technology, 2024 ZnCeO2 and ZnCuCeO2 nanocomposites (NCs) were successfully synthesized using a simplistic co-precipitation method. The structural, morphological, and optical properties of the nanocomposites were thoroughly characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, and ultraviolet-visible spectroscopy. The XRD analysis confirmed the formation of nanocomposites without any secondary phases, revealing average particle sizes of 11.21 nm for ZnCeO2 and 7.02 nm for ZnCuCeO2. The direct band gaps of the nanocomposites were determined to be 3.05 eV for ZnCeO2 and 3.12 eV for ZnCuCeO2, with corresponding refractive indices of 2.19 and 2.14, respectively. Furthermore, the gas-sensing properties of the synthesized nanocomposites were systematically investigated, with a specific focus on their response to n-Butanol gas. Notably, the room-temperature n-Butanol sensing of ZnCuCeO2 NC exhibited enhanced sensing performance, including a rapid response time of 13 s, a quick recovery time of 7 s, and a remarkable sensitivity of 458 for 20 ppm concentration of n-Butanol. These findings underscore the potential of ZnCuCeO2 nanocomposites for practical sensor applications, particularly in the detection of n-Butanol gas, showcasing their promising characteristics for real-world sensing scenarios.
Thin film gas sensors based on NiO and NiO–ZnO–CuO mixed metal oxides for the detection of benzene under ambient conditions S Begum, P Nagaraju, S Sarika Yadav, GR Turpu, K Gopikrishna Journal of Materials Science: Materials in Electronics 37 (4), 290 , 2026 2026
Room temperature benzene gas sensing with spinal copper ferrite and copper cerium oxide nanocomposite sensors KG Krishna, SR Parne, P Nagaraju Microchemical Journal 215, 114278 , 2025 2025 Citations: 3
Enhanced isopropanol gas sensing with ZnFe2O4 and ZnCuFe2O4 spinel nanoferrites at room temperature KG Krishna, SR Parne, P Nagaraju Inorganic Chemistry Communications 174, 114051 , 2025 2025 Citations: 11
Synthesis and characterization of p-CuO/n-ZnO heterostructured composite thin films for the detection of formaldehyde gas S Yadav, P Nagaraju, S Begum, M Swathi, KG Krishna, JK Ojha, ... Journal of Physics: Condensed Matter 37 (5), 055201 , 2025 2025 Citations: 4
Core-shell transition metal disulfide grafted carbon matrix composite as an anode material for high-performance lithium-ion batteries G Krishna Journal of Energy Storage 114 (2025), 115878 , 2025 2025 Citations: 10
Enhanced ammonia detection using rGO-wrapped Zn3V2O8 nanostructures B Naresh, TVM Sreekanth, KG Krishna, KS Kumar, CN Suma, K Yoo, ... Sensors and Actuators A: Physical 379, 115928 , 2024 2024 Citations: 4
Synthesis and characterization of spray deposited ZnO–CuO nano composite thin films for the detection of xylene SS Yadav, N Pothukanuri, S Begum, M Swathi, K Gopikrishna, GR Turpu, ... Journal of Materials Science: Materials in Electronics 35 (30), 1959 , 2024 2024 Citations: 2
Optimized n-Butanol Sensing Performance of ZnCeO 2 and ZnCuCeO 2 Nanocomposites at Room Temperature K Gopi Krishna, SR Parne, N P, DR Edla ECS Journal of Solid State Science and Technology 13 (9), 097004 , 2024 2024 Citations: 2
Exploring the multifunctionality of MoS2 and MoSe2 nanostructures: Enhanced ammonia sensing, antimicrobial activity and organic dye adsorption R Thayil, KG Krishna, A Chinthamreddy, SR Parne Microchemical Journal 204, 111175 , 2024 2024 Citations: 38
Camellia sinensis-mediated green synthesis of ZnO nanoparticles: An eco-friendly approach for high-performance gas sensing G Umadevi, KG Krishna Sensors and Actuators A: Physical 374, 115479 , 2024 2024 Citations: 26
Green synthesis of ZnCeO 2 and ZnCuCeO 2 nanocomposites for enhanced gas sensing: a synergistic approach towards sustainable ammonia detection G Umadevi, KG Krishna, VD Mote Journal of Materials Science: Materials in Electronics 35 (22), 1511 , 2024 2024 Citations: 3
Graphitic carbon nitride (g-C3N4) decorated on CuCo2O4 nanosphere composites for enhanced electrochemical performance for energy storage applications S Gajarajan, C Kuchi, AO Reddy, KG Krishna, KS Kumar, B Naresh, ... Materials Today Communications 39, 108688 , 2024 2024 Citations: 22
Investigations on MWO4 (M= Cu, Zn, Cd and Sn) nanostructures for detecting toluene gas at room temperature EP Kumar, N Chanakya, A Siddiqua, KG Krishna, BV Kumar, ... Sensors and Actuators A: Physical 368, 115094 , 2024 2024 Citations: 17
Synthesis and properties of Eu and Ni Co-doped ZnS nanoparticles for the detection of ammonia gas M Ankinapalli, H GS, GK Kurugundla, C Kuchi, S Munga, PS Reddy ECS Journal of Solid State Science and Technology 13 (3), 037009 , 2024 2024 Citations: 6
MoS2 and MoS2-based nanocomposites for enhanced toluene sensing response at room temperature R Thayil, KG Krishna, S Cherukulappurath, V Kathirvelu, SR Parne Surfaces and Interfaces 46, 104134 , 2024 2024 Citations: 51
Structural, optical and gas sensing properties of Zn-doped CuO nanostructure thin films for benzene gas sensing applications SL Bhise, LH Kathwate, G Umadevi, KG Krishna, VD Mote, BN Dole Journal of Materials Science: Materials in Electronics 35 (1), 66 , 2024 2024 Citations: 15
ZnO/CdO island-like porous nanocomposite as an ultra-sensitive sensor for BTX detection at room temperature KG Krishna, SR Parne, P Nagaraju Surfaces and Interfaces 44, 103631 , 2024 2024 Citations: 11
Optimizing Gas Sensing Properties of Fe-Loaded Indium Zinc Oxide Nanocomposite for Efficient Detection of Ammonia Gas KG Krishna, SR Parne, P Nagaraju ECS Journal of Solid State Science and Technology 12 (12), 127003 , 2023 2023
Hierarchical NiCo2O4/NiO mixed nanofibers for enhanced supercapacitor and ammonia gas sensor applications D Rajasekhar, B Naresh, V Madhavi, KG Krishna, C Kuchi, KS Kumar, ... Inorganic Chemistry Communications 157, 111405 , 2023 2023 Citations: 30
Facile synthesis and enhanced acetone sensing properties of ZnO/TiO2 nanocomposite at room temperature KG Krishna, SR Parne, P Nagaraju Materials Science and Engineering: B 297, 116734 , 2023 2023 Citations: 26
MOST CITED SCHOLAR PUBLICATIONS
Nanostructured metal oxide semiconductor-based gas sensors: A comprehensive review KG Krishna, S Parne, N Pothukanuri, V Kathirvelu, S Gandi, D Joshi Sensors and Actuators A: Physical 341, 113578 , 2022 2022 Citations: 397
Zinc oxide based gas sensors and their derivatives: a critical review KG Krishna, G Umadevi, S Parne, N Pothukanuri Journal of Materials Chemistry C 11 (12), 3906-3925 , 2023 2023 Citations: 124
Rare-earth free self-luminescent Ca 2 KZn 2 (VO 4 ) 3 phosphors for intense white light-emitting diodes LK Bharat, SK Jeon, KG Krishna, JS Yu Scientific Reports 7 (1), 42348 , 2017 2017 Citations: 109
MoS2 and MoS2-based nanocomposites for enhanced toluene sensing response at room temperature R Thayil, KG Krishna, S Cherukulappurath, V Kathirvelu, SR Parne Surfaces and Interfaces 46, 104134 , 2024 2024 Citations: 51
Exploring the multifunctionality of MoS2 and MoSe2 nanostructures: Enhanced ammonia sensing, antimicrobial activity and organic dye adsorption R Thayil, KG Krishna, A Chinthamreddy, SR Parne Microchemical Journal 204, 111175 , 2024 2024 Citations: 38
Rational design of Cu-doped Co3O4@ carbon nanocomposite and agriculture crop-waste derived activated carbon for high-performance hybrid supercapacitors MR Pallavolu, KG Krishna, G Nagaraju, PSS Babu, S Sambasivam, ... Journal of Industrial and Engineering Chemistry 116, 428-437 , 2022 2022 Citations: 37
Energy transfer and luminescence properties of Ce3+/Dy3+ co-doped Sr3SiO5 phosphors for WLEDs KG Krishna, LK Bharat, JS Yu Ceramics International 43 (2), 2586-2591 , 2017 2017 Citations: 34
Hierarchical NiCo2O4/NiO mixed nanofibers for enhanced supercapacitor and ammonia gas sensor applications D Rajasekhar, B Naresh, V Madhavi, KG Krishna, C Kuchi, KS Kumar, ... Inorganic Chemistry Communications 157, 111405 , 2023 2023 Citations: 30
Camellia sinensis-mediated green synthesis of ZnO nanoparticles: An eco-friendly approach for high-performance gas sensing G Umadevi, KG Krishna Sensors and Actuators A: Physical 374, 115479 , 2024 2024 Citations: 26
Facile synthesis and enhanced acetone sensing properties of ZnO/TiO2 nanocomposite at room temperature KG Krishna, SR Parne, P Nagaraju Materials Science and Engineering: B 297, 116734 , 2023 2023 Citations: 26
Graphitic carbon nitride (g-C3N4) decorated on CuCo2O4 nanosphere composites for enhanced electrochemical performance for energy storage applications S Gajarajan, C Kuchi, AO Reddy, KG Krishna, KS Kumar, B Naresh, ... Materials Today Communications 39, 108688 , 2024 2024 Citations: 22
Synthesis and characterization of rGO wrapped 1-D NiO nanofibers for ammonia gas sensing application B Naresh, KG Krishna, C Kuchi, SK Kummara, PS Reddy Surfaces and Interfaces 40, 103012 , 2023 2023 Citations: 20
Investigations on MWO4 (M= Cu, Zn, Cd and Sn) nanostructures for detecting toluene gas at room temperature EP Kumar, N Chanakya, A Siddiqua, KG Krishna, BV Kumar, ... Sensors and Actuators A: Physical 368, 115094 , 2024 2024 Citations: 17
Structural, optical and gas sensing properties of Zn-doped CuO nanostructure thin films for benzene gas sensing applications SL Bhise, LH Kathwate, G Umadevi, KG Krishna, VD Mote, BN Dole Journal of Materials Science: Materials in Electronics 35 (1), 66 , 2024 2024 Citations: 15
Effect of transition metal ion (Nb5+) doping on the luminescence properties of self-activated Ca2AgZn2V3O12 phosphors LK Bharat, KG Krishna, JS Yu Journal of Alloys and Compounds 699, 756-762 , 2017 2017 Citations: 15
Controlled synthesis of yttrium gallium garnet spherical nanostructures modified by silver oxide nanoparticles for enhanced photocatalytic properties LK Bharat, G Nagaraju, KG Krishna, JS Yu CrystEngComm 18 (46), 8915-8925 , 2016 2016 Citations: 13
Enhanced isopropanol gas sensing with ZnFe2O4 and ZnCuFe2O4 spinel nanoferrites at room temperature KG Krishna, SR Parne, P Nagaraju Inorganic Chemistry Communications 174, 114051 , 2025 2025 Citations: 11
ZnO/CdO island-like porous nanocomposite as an ultra-sensitive sensor for BTX detection at room temperature KG Krishna, SR Parne, P Nagaraju Surfaces and Interfaces 44, 103631 , 2024 2024 Citations: 11
An optical study of heterojunction n-ZnO/p-CuO nanosheets and detection of n-butanol vapour at room temperature KG Krishna, SR Parne, P Nagaraju Journal of Materials Science 58 (40), 15660-15675 , 2023 2023 Citations: 11
Core-shell transition metal disulfide grafted carbon matrix composite as an anode material for high-performance lithium-ion batteries G Krishna Journal of Energy Storage 114 (2025), 115878 , 2025 2025 Citations: 10
