Hitha D Shetty

@nmit.ac.in

Associcate professor
Nitte Meenakshi Institute of Technology

https://researchid.co/hitha.d.shetty

RESEARCH INTERESTS

Polymer nano-composites, Dielectric properties, Electromagnetic Shielding

Scopus Publications

174

Scholar Citations

Scholar h-index

Scholar i10-index

Scopus Publications

Remarkable NH<inf>3</inf> gas sensing performance of spray deposited Tb doped WO<inf>3</inf> thin films at room temperature
Devarajan Alagarasan, S.S. Hegde, R. Naik, Hitha D. Shetty, H.B. Shiva Prasad, Thamraa Alshahrani, S. AlFaify, and Mohd. Shkir
Elsevier BV

Integration of sputtering and solvothermal techniques for the synthesis and assessment of WO<inf>3</inf> nanostructure for enhanced electrochromic performance
Kavitha Kamath, Kilari Naveen Kumar, Smitha G. Prabhu, Devarajan Alagarasan, Hitha D. Shetty, and K. B. Manjunatha
Springer Science and Business Media LLC

Fabrication of SnSe nanostructures visible light photodetectors
Devarajan Alagarasan, S.S. Hegde, B. Shanmugavelu, R. Aadhavan, R. Naik, Hitha D. Shetty, V. Ganesh, H. Algarni, and R. Ganesan
Elsevier BV

Effect of doping (Sn and In) on CdS thin films for ammonia sensing at room temperature
Kumar Haunsbhavi, Swapnil Barthwal, N.J. Shivaramu, Hitha Shetty, Devarajan Alagarasan, S. AlFaify, Mohd. Shkir, Prashantha Murahari, and Basavaraj Angadi
Elsevier BV

Fabrication of Bi-doped In<inf>2</inf>S<inf>3</inf> thin films for highly sensitive UV photodetector applications
Devarajan Alagarasan, S.S. Hegde, R. Naik, Prashantha Murahari, Hitha D. Shetty, Fatemah H. Alkallas, Amira Ben Gouider Trabelsi, Farhat S. Khan, S. AlFaify, and Mohd. Shkir
Elsevier BV

Structural, morphological, and photoluminescence properties of nitrogen-doped CNTs and graphitic carbon nanostructures
Venkatesh Ramasamy, Prashantha Murahari, N. R. Banapurmath, N. H. Ayachit, K. Ramesh, K. S. Nivedhitha, Hitha D. Shetty, Chandramouli Vadlamudi, and Sanjay Krishnappa
Springer Science and Business Media LLC

Synthesis and Characterization of WO<inf>3</inf> Nanostructures by the Solvothermal Method for Electrochromic Applications
Kavitha Kamath, K. Naveen Kumar, G. V. Ashok Reddy, Habibuddin Shaik, Smitha G. Prabhu, R. Imran Jafri, Hitha D. Shetty, and K. B. Manjunatha
Springer Science and Business Media LLC

Effect of cerium oxide nanorods growth time on the electrochromic properties of WO<inf>3</inf>/CeO<inf>2</inf> hybrid films
Ashok Reddy G V, Sheik Abdul Sattar, K Naveen Kumar, Hitha D. Shetty, Doreswamy B H, Ramachandra Naik, C. Devaraja, P. Rosaiah, Merum Dhananjaya, Sang Woo Joo,et al.
Elsevier BV

Fabrication of high-performance RT-NH<inf>3</inf> gas sensor based on Cu and La co-doped ZnO films through a facile drop-casting method
Devarajan Alagarasan, S.S. Hegde, R. Naik, Prashantha Murahari, Hitha D. Shetty, Shiva Prasad Hb, F. Maiz, and Mohd Shkir
Elsevier BV

Influence of La<sup>3+</sup> doping on nebulizer spray pyrolysed In<inf>2</inf>S<inf>3</inf> thin film for enhanced photodetector performance
Devarajan Alagarasan, S.S. Hegde, Anuj Kumar, B. Shanmugavelu, Prashantha Murahari, R. Ganesan, Hitha D. Shetty, R. Naik, Mohd Ubaidullah, Manish Gupta,et al.
Elsevier BV

Effect of post annealing on DC magnetron sputtered tungsten oxide (WO<inf>3</inf>) thin films for smartwindow applications
Ashok Reddy G V, K. Naveen Kumar, Sheik Abdul Sattar, Hitha D. Shetty, Nunna Guru Prakash, R. Imran Jafri, C. Devaraja, Manjunatha B C, Kaliprasad C S, R. Premkumar,et al.
Elsevier BV

Electrical conductivity and electromagnetic interference shielding effectiveness of elastomer composites: Comparative study with various filler systems
Hitha D. Shetty, G.V. Ashok Reddy, Venkatesh Ramasamy, C.S. Kaliprasad, B. Daruka Prasad, H.S. Yogananda, Ramachandra Naik, V. Prasad, Ganesh Koyyada, and Yedluri Anil Kumar
Elsevier BV

Structural and electrochemical studies of WO<inf>3</inf> coated TiO<inf>2</inf> nanorod hybrid thin films for electrochromic applications
Ashok Reddy G V, Habibuddin Shaik, K.Naveen Kumar, V. Madhavi, Hitha D. Shetty, Sheik Abdul Sattar, Merum Dhananjaya, B. Daruka Prasad, G.Ranjith Kumar, and B.H. Doreswamy
Elsevier BV

Comparison study of WO<inf>3</inf> thin film and nanorods for smart window applications
G.V. Ashok Reddy, K. Naveen Kumar, Hitha D. Shetty, C. Devaraja, Merum Dhananjaya, H.B. Shiva prased, Nunna Guru Prakash, K.M. Girish, A.R. Venugopal, K. Deepak,et al.
Elsevier BV

Growth of cerium oxide nanorods by hydrothermal method and electrochromic properties of CeO<inf>2</inf>/WO<inf>3</inf> hybrid thin films for smart window applications
Ashok Reddy G V, K. Naveen Kumar, Habibuddin Shaik, Hitha D. Shetty, R. Imran Jafri, Sheik Abdul Sattar, Kavitha Kamath, and B.H. Doreswamy
Elsevier BV

Synthesis, characterizations, and electrochromic studies of WO<inf>3</inf> coated CeO<inf>2</inf> nanorod thin films for smart window applications
G.V. Ashok Reddy, Habibuddin Shaik, K Naveen Kumar, Hitha D. Shetty, R Imran Jafri, Ramachandra Naik, Jyothi Gupta, Sheik Abdul Sattar, and B.H. Doreswamy
Elsevier BV

Low temperature magnetic properties and electromagnetic interference shielding effectiveness of PDMS composites
Hitha D. Shetty, Ananya Patra, and V. Prasad
Elsevier BV

Adjustable radio-frequency negative permittivity in graphite-PDMS elastomer metacomposites
Hitha D Shetty, Krishna Prasad Maity, and V Prasad
Elsevier BV
Abstract Metacomposites with tunable negative permittivity find wide range of applications such as in novel electrical devices, flexible invisibility cloaks, stretchable sensors, etc. In the work reported here, the superior tunable negative permittivity of Polydimethylsiloxane (PDMS)-Graphite nanocomposites, over graphite and neat PDMS has been demonstrated. The ac conductivity and impedance of PDMS composites with varying graphite loading are studied as a function of frequency (100 Hz–100 MHz). Interesting phenomenon like capacitive-inductive transition and positive to negative switching of permittivity are observed and interrelationships between them is discussed here. The negative permittivity which is mainly due to the inductive conductive networks formed within the composites, is explained based on interband transition and Drude theory of metals. For 30 wt% composite maximum positive permittivity of 280.4 and maximum negative value of -29.87 is observed at 100 Hz and 3.35 × 107 Hz respectively. For higher graphite loading the permittivity switching frequency is found to shift to lower frequency region due to increased inductive behaviour of the composites.

Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial
Hitha D. Shetty, Ananya Patra, and V. Prasad
Elsevier BV
Abstract Negative permittivity is an exceptional property of metamaterials, which makes them unique class of artificial materials with numerous applications ranging from cloaking to wave filters. In this paper we report about the PDMS (Polydimethylsiloxane)–MWcnt (Multi wall carbon nano tube) composite beyond percolation, as a metamaterial with high negative permittivity. Percolated composite showed high negative permittivity of −2376.62 at 2541.401 Hz and low tangent loss of −0.065 at 1 MHz. The conductivity spectra followed Jonscher’s power law, indicating hopping conduction for composites below percolation threshold. Beyond percolation, networking between the MWcnts formed large number of conductive paths resulting in free electron conduction. The impedance studies showed the capacitive-inductive transition in the percolated composite with inductive phase exhibiting negative permittivity.

Existence of negative permittivity in carbon coated iron nanoparticle - PDMS composites
Hitha D. Shetty and V. Prasad
Elsevier BV
Abstract We prepared polydimethylsiloxane (PDMS)-carbon coated iron nanoparticle (CCFeNP) composites (varying filler content) to investigate the dielectric behaviour, in the frequency range 100 Hz–100 MHz. The sample structures were studied by means of Transmission Electron Microscopy (TEM), Scanning electron microscopy (SEM) and X-ray diffraction (XRD). The ac conductivity, impedance, permittivity and dielectric loss of PDMS-CCFeNP composites were analysed. The real part of permittivity/epsilon (eʹ) for the cured composites varied inversely with frequency and switched from positive to negative. The 10 wt% composites exhibit negative permittivity at higher frequency, whereas for 50 wt% permittivity switches from a highly positive to negative at very low frequency and remained negative thereafter. The shifting of switching frequency towards lower frequencies with increasing filler loading is attributed to the increased inductive nature of the composites. The unique frequency dispersion of permittivity is explained by interband transition and Drude model (multiband nature of the electronic excitations). The well dispersed filler particles in PDMS matrix gave the high permittivity of 833 for 30 wt% composite at 1 kHz. The frequency dependence of real part of ac conductivity (σ ac ʹ) and impedance studies were carried out to elucidate the capacitive-inductive transition and dielectric resonance in the composites.

RECENT SCHOLAR PUBLICATIONS

High-Performance Photodetector Applications of Antimony doped Indium Sulfide Thin Films: Preparation, Characterization and Optical Studies
P Murahari, D Alagarasan, SS Hegde, HD Shetty, M Verma, NA Siddiqui, ...
Optical Materials, 116903 2025

Remarkable NH3 gas sensing performance of spray deposited Tb doped WO3 thin films at room temperature
D Alagarasan, SS Hegde, R Naik, HD Shetty, HBS Prasad, T Alshahrani, ...
Journal of Photochemistry and Photobiology A: Chemistry 459, 116087 2025

Fabrication of SnSe nanostructures visible light photodetectors
D Alagarasan, SS Hegde, B Shanmugavelu, R Aadhavan, R Naik, ...
Inorganic Chemistry Communications 170, 113276 2024

Effect of doping (Sn and In) on CdS thin films for ammonia sensing at room temperature
K Haunsbhavi, S Barthwal, NJ Shivaramu, H Shetty, D Alagarasan, ...
Sensors and Actuators A: Physical 376, 115567 2024

Fabrication of Bi-doped In2S3 thin films for highly sensitive UV photodetector applications
D Alagarasan, SS Hegde, R Naik, P Murahari, HD Shetty, FH Alkallas, ...
Journal of Photochemistry and Photobiology A: Chemistry 454, 115697 2024

Structural, morphological, and photoluminescence properties of nitrogen-doped CNTs and graphitic carbon nanostructures
V Ramasamy, P Murahari, NR Banapurmath, NH Ayachit, K Ramesh, ...
Journal of Materials Science 59 (29), 13532-13540 2024

Synthesis and Characterization of WO₃ Nanostructures by the Solvothermal Method for Electrochromic Applications
K Kamath, KN Kumar, GVA Reddy, H Shaik, SG Prabhu, RI Jafri, ...
Journal of Electronic Materials 53 (8), 4564-4574 2024

Effect of cerium oxide nanorods growth time on the electrochromic properties of WO3/CeO2 hybrid films
AR GV, SA Sattar, KN Kumar, HD Shetty, BH Doreswamy, R Naik, ...
Physica B: Condensed Matter 683, 415861 2024

Fabrication of high-performance RT-NH3 gas sensor based on Cu and La co-doped ZnO films through a facile drop-casting method
D Alagarasan, SS Hegde, R Naik, P Murahari, HD Shetty, SP Hb, F Maiz, ...
Optical Materials 147, 114705 2024

Influence of La3+ doping on nebulizer spray pyrolysed In2S3 thin film for enhanced photodetector performance
D Alagarasan, SS Hegde, A Kumar, B Shanmugavelu, P Murahari, ...
Journal of Photochemistry and Photobiology A: Chemistry 444, 114941 2023

Effect of post annealing on DC magnetron sputtered tungsten oxide (WO₃) thin films for smartwindow applications
A Reddy GV, K Naveen Kumar, SA Sattar, HD Shetty, N Guru Prakash, ...
Physica B Condensed Matter 664, 414996 2023

Electrical conductivity and electromagnetic interference shielding effectiveness of elastomer composites: Comparative study with various filler systems
HD Shetty, GVA Reddy, V Ramasamy, CS Kaliprasad, BD Prasad, ...
Inorganic Chemistry Communications 151, 110578 2023

Structural and electrochemical studies of WO3 coated TiO2 nanorod hybrid thin films for electrochromic applications
AR GV, H Shaik, KN Kumar, V Madhavi, HD Shetty, SA Sattar, ...
Optik 277, 170694 2023

Comparison study of WO3 thin film and nanorods for smart window applications
GVA Reddy, KN Kumar, HD Shetty, C Devaraja, M Dhananjaya, ...
Materials Today: Proceedings 2023

Growth of cerium oxide nanorods by hydrothermal method and electrochromic properties of CeO2/WO3 hybrid thin films for smart window applications
AR GV, KN Kumar, H Shaik, HD Shetty, RI Jafri, SA Sattar, K Kamath, ...
Materials Today: Proceedings 80, 833-839 2023

Synthesis, characterizations, and electrochromic studies of WO3 coated CeO2 nanorod thin films for smart window applications
GVA Reddy, H Shaik, KN Kumar, HD Shetty, RI Jafri, R Naik, J Gupta, ...
Physica B: Condensed Matter 647, 414395 2022

Low temperature magnetic properties and electromagnetic interference shielding effectiveness of PDMS composites
VP Hitha D. Shetty, Ananya Patra
Journal of Magnetism and Magnetic Materials 525, 167678 2021

Adjustable radio-frequency negative permittivity in graphite-PDMS elastomer metacomposites
HD Shetty, KP Maity, V Prasad
Surfaces and Interfaces 21, 100670 2020

Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial
HD Shetty, A Patra, V Prasad
Materials Letters 210, 309-313 2018

Existence of negative permittivity in carbon coated iron nanoparticle-PDMS composites
HD Shetty, V Prasad
Materials Chemistry and Physics 196, 153-159 2017

MOST CITED SCHOLAR PUBLICATIONS

Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial
HD Shetty, A Patra, V Prasad
Materials Letters 210, 309-313 2018
Citations: 18

Existence of negative permittivity in carbon coated iron nanoparticle-PDMS composites
HD Shetty, V Prasad
Materials Chemistry and Physics 196, 153-159 2017
Citations: 16

Comparison study of WO3 thin film and nanorods for smart window applications
GVA Reddy, KN Kumar, HD Shetty, C Devaraja, M Dhananjaya, ...
Materials Today: Proceedings 2023
Citations: 9

Adjustable radio-frequency negative permittivity in graphite-PDMS elastomer metacomposites
HD Shetty, KP Maity, V Prasad
Surfaces and Interfaces 21, 100670 2020
Citations: 9

Publications

Polydimethylsiloxane-multiwalled carbon nanotube composite as a metamaterial HD Shetty, A Patra, V Prasad, Materials Letters 210, 309-313, 2018
Existence of negative permittivity in carbon coated iron nanoparticle-PDMS composites, HD Shetty, V Prasad, Materials Chemistry and Physics 196, 153-159, 2017