Research Force

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CAREER PROFILE

Recent graduate with PhD in Nanotechnology. Excellent research, time management and problem solving skills.

Highly organized with the ability to manage projects and consistently meet deadlines.

Eager to learn new technologies and methodologies.

Always willing to innovate the new things which can improve the existing technology. ACADEMIA

Doctorate of Philosophy in Nanotechnology from VIT University, Vellore. (May 2016) Thesis title: “Study and Characterization of Ambient Adlayer Behavior on Graphite and Graphene Interfaces Using Scanning Probe Microscopy”. Supervisor: Prof. Dr. Gargi Raina

Master of Science in Nanoscience & Technology from Bharathiar University, Coimbatore. (May 2010) 91%

Bachelor of Science in Physics from P.K.R Arts College for Women, Erode. (May 2008) 86%

Higher Secondary School from Ideal Higher Secondary School, Erode. (May 2005) 76%

School of Secondary Education from Palaniammal Girl’s Higher Secondary School, Erode. (March 2003) 93% SKILLS AND TECHNIQUES

CP-II (Veeco Model) Atomic Force Microscopy

Scanning Tunneling Microscopy

Electrostatic Force Microscopy

Scanning Probe Microscopy Nanolithography techniques

Nanosurf Atomic Force Microscopy and Scanning Tunneling Microscopy

Naio Atomic Force Microscopy

High Resolution Optical Microscope

Chemical vapor deposition system

Knowledge in Raman Spectroscopy, X-Ray Diffraction, Scanning Electron Microscopy, Tunneling Electron Microscopy, UV-Vis Spectroscopy, FT-IR Spectroscopy

Simulation tools: SPIP (Scanning Probe Image Processor), Image Processing and Data Analysis & WSxM Scanning Probe Microscopy software

RESEARCH AREAS

Scanning Probe Microscopy-based Nanolithography

Synthesis and Characterization of Nanomaterials and Nanostructures

Graphene - Different types of synthesis techniques, Characterization and Nanolithography

Nanoscale device Fabrication

Dr. T. Gowthami

Address for correspondence

1A Anjugam Street, Krishna road Extension,

New Perungalathur,

Chennai – 600063, Tamilnadu, India.

E-mail: ********.*****@*****.***

Mobile: 094******** / 087********

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ACADEMIC EXPERIENCE

Research Associate at VIT University from Aug 19, 2010 to April 29, 2015. Responsible for the operations of AFM, STM facilities and handling the nanomaterial characterization lab classes for M. Tech. Nanotechnology.

AWARDS

Research award, VIT, cash prize for research publication in peer reviewed journal, 2013.

Research awards for the effort in research publication in peer reviewed journals, 2014 and 2015. PUBLICATIONS (REFEREED JOURNAL PAPERS)

T. Gowthami, G. Tamilselvi, Geroge Jacob and Gragi Raina, “The role of ambient ice-like water adlayers formed at the interfaces of graphene on hydrophobic and hydrophilic substrates probed using scanning probe microscopy”, Phys. Chem. Chem. Phys., vol. 17, no. 21, pp. 139**-*****, Apr. 2015. Impact factor: 4.493.

T. Gowthami, Narendra Kurra and Gargi Raina, “Interaction and dynamics of ambient water adlayers on graphite probed using AFM voltage nanolithography and electrostatic force microscopy”, Nanotechnology, vol. 25, no.15, 155304 (9pp), Mar. 2014. Impact factor: 3.821.

T. Gowthami, Monika Gadhewal and Gargi Raina, “Study of Stability of Local Anodic Oxidation on HOPG and Few Layer Graphene using AFM in ambient”, IEEE Transactions on Nanotechnology, vol. 12, no. 6, pp. 1002-1006, Nov. 2013. Impact factor: 2.85.

Gargi Raina, T. Gowthami and G. Tamilselvi, “Effect of the formation of ambient ice-like water ad-layers at the interface of different layer graphene on SiO2/Si substrates”, Indian J Sci. Technol., Vol. 9, no. 48, Dec. 2016. Impact factor: 0.68.

CONFERENCE PAPERS

T. Gowthami and Gargi Raina, “Study of patterning on few-layer and multi-layer graphene using atomic force microscopy and electrostatic force microscopy in ambient”, International Conference on Nanoscience & Nanotechnology (ICNN-2013), 18-20th November, 2013 at Babasaheb Bhimrao Ambedkar University, Lucknow, U.P., India.

T. Gowthami, Monika Gadhewal and Gargi Raina, “Study of Stability of LAO patterns on HOPG and on a few layers of graphene using AFM in the ambient conditions”, 2nd International conference on Nanotechnology, Innovative Materials, Processes, Products and Applications, NANOCON 012, 18-19th October, 2012 at Bharathi Vidyapeeth University, Pune.

T. Gowthami and Gargi Raina, “Graphene Nanocomposites for Environmental Applications”, Second International Conference in Science and Technology, April 2011, at VIT University, Vellore.

T. Gowthami and Gargi Raina, “Graphene based Nanocomposites and their applications – Current status”, Second National Conference on Multifunctional Nanomaterials and Nanocomposites (NCMNN-11), 24-25th March, 2011, at Bharathiyar University, Coimbatore.

PROFESSIONAL DEVELOPMENT ACTIVITIES

Attended Workshop on Nanosurf AFM/STM, 31st Jan & 01st, February 2013, held at Sinsil international, Bangalore.

Attended Two Day Workshop on LaTeX for Researchers, 26-27th, July 2013, at VIT University, Vellore. 3

Presented a Research Paper in International Conference on Nanoscience & Nanotechnology (ICNN-2013), 18-20th, November 2013, at Babasaheb Bhimrao Ambedkar University, Lucknow.

Presented a Research Paper in Second International conference on Nanotechnology, Innovative Materials, Processes, Products and Applications, NANOCON 012, 18-19th, October 2012, at Bharathi Vidyapeeth University, Pune.

Presented a Research Paper in Second International Conference in Science and Technology, 20th-21st, April 2011, at VIT University, Vellore.

Presented a Research Paper in Second National Conference on Multifunctional Nanomaterials and Nanocomposites (NCMNN-11), 24-25th, March 2011, at Bharathiyar University, Coimbatore.

Attended Faculty Development Programme on “A Practicum on Vacuum Technology”, 4th October 2011, at VIT University, Vellore.

Attended one-day seminar on Essentials of Good Research-Trends and Techniques, 30th October 2010, at VIT University, Vellore.

PERSONAL VITAE

Date of Birth : 24th July 1988

Permanent Address : 4/528 S. P. Nagar,

: Kullampalayam (Po), Gobichettipalayam (Tk)

: Erode (Dt) -638476, Tamilnadu, India

Gender : Female

Marital Status : Married

Nationality : Indian

Language proficiency : English and Tamil

REFERENCE

Dr. Gargi Raina

Professor,

SENSE,

VIT University Chennai Campus,

Mobile No: +91-999*******.

E-mail: *****.*****@*****.***, **********@***.**.** Dr. T. Gowthami

Mob 094********

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Annexure-I

Ph. D. Thesis title: “Study and Characterization of Ambient Adlayer Behavior on Graphite and Graphene Interfaces Using Scanning Probe Microscopy”

Summary of Ph.D. Dissertation Work

Currently, graphene surface is widely used in several fields of nanoelectronics device applications by many researchers. The ambient water adlayers grow at the graphene interfaces with exposure to the ambient, due to which electronic properties of graphene are altered and can severely affect the properties of the devices. The aim of this thesis is to study and characterize the ambient water adlayers’ role and presence, on bare regions and nanolithographically patterned surfaces of highly oriented pyrolytic graphite (HOPG), mechanically exfoliated few layer graphene (FLG) and multilayer graphene (MLG). Scanning probe microscopy (SPM) technique is used to study the graphene interfaces viz. FLG and MLG on hydrophobic Si and hydrophilic SiO2/Si substrates with high vertical and lateral nanometer resolutions. This is an important study which affects the performance of graphene based devices’ ambient operation.

Temporal variations in the dimensions of the trench patterns created using atomic force microscopy (AFM) voltage nanolithography technique on HOPG and mechanically exfoliated FLG surfaces over several days, under ambient, is reported in this work.

Further, systematic study is performed to investigate the evolution of trench patterns’ dimensions, created on HOPG, as a function of the increasing number of water adlayers present on the surface of HOPG under ambient conditions. The evolution of the lithography trench patterns created soon after HOPG surface cleaving in ambient revealed a change in width of ~33-40% over 30 h since lithography. It is demonstrated that the effect of a thin ice-like polarized water adlayers’ stored electrostatic energy under ambient, contributes towards a slow etching reaction on AFM nanolithography reactive sites on HOPG long after lithography.

Further, the growth of ice-like water adlayers in between interfaces of as-prepared and patterned FLG, MLG flakes on hydrophobic Si and hydrophilic SiO2/Si substrates, when exposed to ambient over several days, is also investigated. The growth time of initial ice-adlayer formation is dependent on the nature of graphene viz., FLG (hydrophilic) and MLG

(hydrophobic) with respect to the water affinity for the underlying substrates. For similar affinity towards water, it takes shorter time for the initial ice-adlayer formation, as against for dis-similar affinity. The patterned FLG and MLG flakes on Si induces quick formation of initial ice–like water adlayers. These studies mainly describe the fundamental issues about the stability of lithographically modified patterns’ dimension, on account of presence of ambient ice-like water adlayers, which affects the operation of graphene based nanoelectronic devices viz., graphene nanoribbons field effect transistors and quantum devices under ambient conditions. M.Sc., Project work: “Synthesis and Luminescence Studies of Zinc Oxide Based Phosphors”- Work Carried Out in Dr. M. S. Ramachandra Rao’s lab, Nano Functional Materials Technology Centre, IIT Madras The aim of this work was to synthesize high quality ZnO based phosphors and to deposit nano sized thin film of ZnO phosphors by Pulsed Laser Deposition. Thus synthesized samples were characterized using X- Ray Diffraction technique, Photoluminescence Spectroscopy, Diffuse Reflectance Spectroscopy, Scanning Electron Microscopy and Energy Dispersive X-ray analysis. An attempt has also been made to understand the underlying physics behind the effect of dopants on the host lattice in controlling the emission characteristics and to envisage display applications.

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