Department of Physics

Indian Institute Of Technology Madras , Chennai

Ph.D. JULY-NOV 2021 RESULTS List of candidates provisionally approved for July-November 2021 admission to PhD Programme

Dr. Somnath Chanda Roy

HSB 119B

DESIGNATION

Professor

Ph.D.

IIT Delhi

CURRENT RESEARCH INTEREST

Nano-materials for energy and environment, Electronic and Optical properties of nano-materials, Solar cells, Photo-catalysis, Gas sensing

CONTACT

044 - 2257 4886

somnath@iitm.ac.in

RESEARCH GROUPS

Environmental Physics

Personal Home Page

Research Group Page

Current Research :

Recent Publications :

Electronic structure of graphene/TiO2 interface: Design and functional perspectives

Shashi B Mishra, Somnath C Roy, BRK Nanda

Applied Surface Science

Volume: 542 Page: 148709 DOI: doi.org/10.1016/j.apsusc.2020.148709

Year: 2021

Morphology dependent electrical conduction and breakdown in single TiO2 nanotubes

Sourav K Kajli, Debdutta Ray, Somnath C Roy

Nanoscale Advances

Volume: 3 Page: 432 DOI: doi.org/10.1039/d0na00713g

Year: 2021

Hydrothermal temperature-controlled size and distribution of CeO2 nanoparticles over TiO2 nanorods: heterojunction characteristics and photoelectrochemical performance

Sutapa Dey, Somnath C Roy

Ceramics International

Volume: 47(10) Page: 14603 DOI: doi.org/10.1016/j.ceramint.2021.02.043

Year: 2021

Designing TiO2 nanostructures through hydrothermal growth: influence of process parameters and substrate position

Sutapa Dey, Somnath C Roy

Nano Express

Volume: 2 Page: 010028 DOI: doi.org/10.1088/2632-959X/abe844

Year: 2021

Anomalous diameter dependent electrical transport in individual CuO nanowire

Sourav K Kajli, Debdutta Ray, Somnath C Roy

Journal of Physics D: Applied Physics

Volume: 54(25) Page: 255104 DOI: doi.org/10.1088/1361-6463/abeeb8

Year: 2021

Investigation of Photo-induced enhancement of sensitivity and electro-chemical surface phenomenon of multileg TiO2 nanotubes sensor device towards H2O2

P Chithra Lekha, Y Rambabu, V T Fidal Kumar, T S Chandra, Somnath C Roy

Journal of Electroanalytical Chemistry

Volume: 895 Page: 115399 DOI: doi.org/10.1016/j.jelechem.2021.115399

Year: 2021

Influence of Ce doping on morphology, crystallinity and photoelectrochemical charge transfer characteristics of TiO2 nanorod arrays grown on conductive glass substrate

Sutapa Dey, Somnath C Roy

Journal of Alloys and Compounds

Volume: In Press DOI: doi.org/10.1016/j.jallcom.2021.160481

Year: 2021

Adsorption and degradation mechanism of 2,4,6-trinitrotoluene on TiO2 (110) surface

Shashi B. Mishra, S. Marutheeswaran, Somnath C. Roy, V. Natarajan, P. K. Rai, B.R.K. Nanda

Surface Science

Volume: 713 Page: 121902 DOI: doi.org/10.1016/j.susc.2021.121902

Year: 2021

Highly efficient photoelectrochemical ZnO and TiO2 nanorod/Sb2S3 heterostructured photoanodes through one step thermolysis of Sb-MPA complex

V Sharma, A C Dakshinamurthy, B Pandey, Somnath C Roy, C Sudakar

Solar Energy

Volume: 225 Page: 333 DOI: doi.org/10.1016/j.solener.2021.07.045

Year: 2021

Unravelling atomically resolved structure of a high-k dielectric oxidesemiconductor interface: Exit wave reconstruction and ab-initio calculation insights

Mahabul Islam, Piu Rajak, Satyesh K Ydav, Somnath C Roy, Somnath Bhattacharyya

Journal of Alloy and Compounds

Volume: 813 Page: 152232 DOI: 10.1016/j.jallcom.2019.152232

Year: 2020

Charge transfer mediated photoluminescence enhancement in carbon dots embedded in TiO2 nanotube matrix

Anu B, B Pandey, Somnath C Roy, Jayeeta Bhattacharya

Carbon

Volume: 161 Page: 535 DOI: https://doi.org/10.1016/j.carbon.2020.01.097

Year: 2020

High Photo-electrochemical performance of reduced graphene oxide wrapped, CdS functionalized, TiO2 multi-leg nanotubes

Y Rambabu, Swati Dhua, Manu Jaiswal, Somnath C Roy

Nanotechnology

Volume: Accepted DOI: https://doi.org/10.1088/1361-6528/ab84a0

Year: 2020

CuO/Cu2O nanoflake/nanowire heterostructure photocathode with enhanced surface area for photoelectrochemical solar energy conversion

Subish John, Somnath C Roy

Applied Surface Science

Volume: 509 Page: 144703 DOI: https://doi.org/10.1016/j.apsusc.2019.144703

Year: 2020

Template-free fabrication of BiFeO3 nanorod arrays: multiferroic and photo-electrochemical performances

Swati Dhua, Hideto Furuno, Tomoyuki Homma, Nobuo Saito, Somnath C Roy

Nanotechnology

Volume: Article In Press DOI: https://doi.org/10.1088/1361-6528/ab9132

Year: 2020

Effect of oxygen nonstoichiometry on the photoelectrochemical performance of oxide-nanorod based TiO2/Sb2S3 and ZnO/Sb2S3 heterostructured photoanodes

Vikas Sharma, Athrey C D, Beauty Pandey, Somnath C Roy, C. Sudakar

Nano Express

DOI: 10.1088/2632-959X/abd2d3

Year: 2020

TiO2 Nanotube Arrays on Flexible Kapton Substrates for Photo Electrochemical Solar Energy Conversion

Samba Siva Vadla, Payel Bandyopadhyay, Subish John, Pijush Ghosh, Somnath C Roy

ACS Applied Nano Materials

Volume: 3(12) Page: 11715 to 11724 DOI: dx.doi.org/10.1021/acsanm.0c02028

Year: 2020

A scalable approach for functionalization of TiO2 nanotube arrays with g-C3N4 for enhanced photoelectrochemical performance

Beauty Pandey, Sanju Rani, Somnath C Roy

Journal of Alloys and Compounds

Volume: 846 Page: 155881 DOI: doi.org/10.1016/j.jallcom.2020.155881

Year: 2020

Mechanistic understanding of NO2 dissociation on rutile TiO2 (110) surface: an electronic structure study

S Marutheeswaran, Shashi B Mishra, Somnath C Roy, B R K Nanda

Journal of Physical Chemistry C

Volume: 124 Page: 8786 DOI: dx.doi.org/10.1021/acs.jpcc.0c00525

Year: 2020

Photocatalytic reduction of carbon dioxide using graphene oxide wrapped TiO2 nanotubes

Y Rambabu, Umesh Kumar, Nikita Singhal, Meenal Kaushal, Manu Jaiswal, Suman L Jain, Somnath C Roy

Applied Surface Science

DOI: 10.1016/j.apsusc.2019.04.041

Year: 2019

High photoelectrochemical activity of CuO nanoflakes grown on Cu foil

Subish John, Samba Siva Vadla, Somnath C Roy

Electrochimica Acta

Volume: Article in press Page: 00 DOI: 10.1016/j.electacta.2019.07.008

Year: 2019

Direct growth of self-aligned single-crystalline GaN nanorod array on flexible Ta foil for photocatalytic solar water-splitting

P. Tyagi, C. Ramesh, J. Kaswan, Swati. Dhua, Subish. John, A.K. Shukla, Somnath C. Roy, S.S. Kushvaha, S.K. Muthusamy

Journal of Alloys and Compounds

Volume: Accepted Manuscript DOI: 10.1016/j.jallcom.2019.07.071

Year: 2019

Local probing of magnetoelectric coupling in BaTiO3-Ni 1–3 composites

Samba Siva Vadla, Tommaso Costanzo, Subish John, Gabriel Caruntu, Somnath C. Roy

Scripta Materialia

Volume: 159 Page: 33-36 DOI: https://doi.org/10.1016/j.scriptamat.2018.09.003

Year: 2019

Chemicapacitive gas sensors based on TiO2 and BaTiO3 nanotube arrays

B Manmadha Rao, Somnath C Roy

Sensor Letters

Volume: 16 Page: 2 DOI: 10.1166/sl.2018.3922

Year: 2018

Controlled and Selective Growth of 1D and 3D CdTe Nanostructures through a Structurally Engineered Porous Alumina Template for Enhanced Optical Applications

H S Bindra, Subish John, Somnath C Roy, O P Sinha, S S Islam, Ranu Naik

Journal of the Electrochemical Society

Volume: 165 Page: H3061-H3068 DOI: 10.1149/2.0091804jes

Year: 2018

Photo-electrochemical properties of graphene wrapped hierarchically branched nanostructures obtained through hydrothermally transformed TiO2 nanotubes

Yalavarthi Rambabu, Manu Jaiswal, Somnath C Roy

Nanotechnology

Volume: In Press DOI: https://doi.org/10.1088/1361-6528/aa8355

Year: 2017

Probing the charge recombination in rGO decorated mixed phase (anatase-rutile) TiO2 multi-leg nanotubes

Yalavarthi Rambabu, Manu Jaiswal, Somnath C Roy

AIP Advances

Volume: 6 Page: 115010 DOI: 10.1063/1.4967387

Year: 2016

Effect of annealing temperature on the phase transition, structural stability and Photo-electrochemical performance of TiO2 multi-leg nanotubes

Yalavarthi Rambabu, Manu Jaiswal, Somnath C Roy

Catalysis Today

Volume: Available Online 19 February 2016 DOI: 10.1016/j.cattod.2016.01.016

Year: 2016

Enhanced photoelectrochemical properties of reduced graphene oxide wrapped TiO2 multileg nanotubes

Y Rambabu, Manu Jaiswal, Somnath C Roy

Journal of the Electrochemical Society

Volume: 163 (8) Page: H652 - H658 DOI: 10.1149/2.0351608jes

Year: 2016

Modified photo-electrochemical and photo-voltaic properties of solvothermally crystallised TiO2 nanotube arrays

Manmadha Rao Banki, Mukta Tathavadekar, C Venkatrao, Somnath C Roy

Journal of Materials Science : Materials in Electronics (JMS-E)

DOI: 10.1007/s10854-016-5248-0

Year: 2016

Enhanced photoelectrochemical performance of multi-leg TiO2 nanotubes through efficient light harvesting

Y Rambabu, Manu Jaiswal, Somnath C. Roy

Journal of Physics D: Applied Physics

Volume: 48 Page: 295302 DOI: 10.1088/0022-3727/48/29/295302

Year: 2015

Water assisted crystallization, gas sensing and photo-electrochemical properties of electrochemically synthesized TiO2 nanotube arrays

B. Manmadha Rao, Somnath C. Roy

RSC Advances

Volume: 4 Page: 49108 DOI: 10.1039/c4ra06842d

Year: 2014

Anatase TiO2 nanotube arrays with high temperature stability

B. Manmadha Rao, Somnath C. Roy

RSC Advances

Year: 2014

Solvothermal processing of amorphous TiO2 nanotube arrays: achieving crystallinity at a lower thermal budget

B. Manmadha Rao, Somnath C. Roy

Journal of Physical Chemistry C

Year: 2014

Theory, instrumentation and applications of magnetoelastic resonance sensors: A reveiw

Craig A. Grimes, Somnath C. Roy, Sanju Rani, and Q. Y. Cai

Sensors 11 (2011) 2809-2844.

Year: 2011

Synthesis and applications of electrochemically self-assembled titania nanotube arrays,

Sanju Rani, Somnath C. Roy, Maggie Paulose, Oomman K. Varghese, Gopal K. Mor, Sanghoon Kim, Sorachon Yoriya, Thomas J. LaTempa, C. A. Grimes;

Phys. Chem. Chem. Phys. 12, p 2780, (2010).

Year: 2010

Toward solar fuels: Photocatalytic conversion of carbon dioxide to hydrocarbons,

Somnath C. Roy, Oomman K. Varghese, Maggie Paulose, and Craig A. Grimes;

ACS Nano, 4, p 1259 (2010).

Year: 2010

p-Type gas sensing behaviour of undoped SnO2 thin films irradiated with a high energy ion beam;

Sanju Rani, M. C. Bhatnagar, Somnath C. Roy, N. K. Puri, D. Kanjilal;

Sensors and Actuators B, 135, p 35 (2008).

Year: 2008

Use of magnetoelastic sensors for quantifying platelet aggregation I: Whole blood and platelet rich plasma;

Somnath C. Roy, J. R. Werner, D. Kouzoudis, C. A. Grimes;

Sensor Letters, 6, p 280 (2008).

Year: 2008

Effect of swift heavy ion irradiation on structure, optical, and gas sensing properties of SnO 2 thin films;

Sanju Rani, N. K. Puri, Somnath C. Roy, M. C. Bhatnagar, D. Kanjilal;

Nuclear Instruments and Methods in Physics Research (NIM)B, 266, p 1987 (2008).

Year: 2008

Eliminating unwanted nanobubbles from hydrophobic solid/liquid interfaces: A case study using magnetoelastic sensors;

X. Feng, Somnath C. Roy, C. A. Grimes;

Langmuir, 24, p 3918 (2008).

Year: 2008

The effect of TiO2 nanotubes in the enhancement of blood clotting for the control of hemorrhage;

Somnath C. Roy, Maggie Paulose, Craig A Grimes;

Biomaterials, 28, p 4667, (2007).

Year: 2007

Large blue shift in the optical band-gap of sol-gel derived BST thin films;

Somnath C Roy, G. L. Sharma, M. C. Bhatnagar;

Solid State Communications 141, p 243 (2007).

Year: 2007

Effect of Fe doping on the gas sensing properties of nano-crystalline SnO2 thin films;

Sanju Rani, Somnath C. Roy, M. C. Bhatnagar;

Sensors and Actuators B 122, p 204 (2007) .

Year: 2007