Hitha D Shetty
@nmit.ac.in
Associcate professor
Nitte Meenakshi Institute of Technology
RESEARCH INTERESTS
Polymer nano-composites, Dielectric properties, Electromagnetic Shielding
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Kumar Haunsbhavi, Swapnil Barthwal, N.J. Shivaramu, Hitha Shetty, Devarajan Alagarasan, S. AlFaify, Mohd. Shkir, Prashantha Murahari, and Basavaraj Angadi
Elsevier BV
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
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
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
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
Devarajan Alagarasan, S.S. Hegde, R. Naik, Prashantha Murahari, Hitha D. Shetty, Shiva Prasad Hb, F. Maiz, and Mohd Shkir
Elsevier BV
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
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
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
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
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
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
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
Hitha D. Shetty, Ananya Patra, and V. Prasad
Elsevier BV
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.
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.
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
MOST CITED SCHOLAR PUBLICATIONS
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