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Dr. Eswaraiah Varrla

Ph.D

Research Assistant Professor

                Eswar Research Group

Welcome to our webpage on Laboratory of 2D Materials and Nanocomposites (2DMN) Research Group. Our Lab focus is to develop scalable, sustainable production methods and processing techniques for nanomaterials with an emphasis to develop novel, energy efficient and cost-effective approaches for fundamentally and commercially useful low dimensional materials such as two-dimensional materials (Graphene, Transition Metal Dichalcogenides, black phosphorus), 1D/3D nanomaterials and their hybrids for a variety of applications. Our specific target is to achieve property enhancement and devices made from dispersions for a plethora of applications. We do an extensive study in production and characterization of exfoliated graphene and other 2D materials for estimating the quality of the nanosheets produced and their physical properties. 

Dr. V. Eswaraiah joined SRM Research Institute and Department of Physics and Nanotechnology as an Assistant Professor of Research in SRM Institute of Science and Technology (formerly known as SRM University), Kattankulathur campus since August 2017. We develop energy efficient production and innovative processing techniques for low-dimensional materials especially 2D materials which find applications in sensing, printed electronics, composites, thermal and electronics applications. We have contributed key findings in graphene production and processing techniques in this emerging area of research and co-inventor of three inventions in the area of graphene and strain sensor nanocomposites. His current interest is in high yield production in 2D materials and design of devices using low dimensional materials for nanocomposites, energy and electronic applications. 

Research Expertise

  • Defect and defect-free graphene
  • Nanosheets of Transition metal dichalcogenides based semiconductors (MoS2, WS2 etc.)
  • Low dimensional materials
  • Liquid Phase Exfoliation of bulk layered materials
  • Suspensions and Rheological behavior
  • Scalable manufacturing of 2D materials
  • Efficient processing methodologies for nanomaterials
  • Sensors and Energy generation devices
  • Polymer nanocomposites and electrical percolation

Education

  • M.Sc. Physics from Sri Venkateswara University, Tirupati   2005-2007
  • Ph.D. Physics from Indian Institute of Technology Madras, Chennai  2007-2012

Experience

  • Aug 2017 – Present, Research Assistant Professor in SRM Research Institute, SRM Institute of Science and Technology (formerly known as SRM University), Department of Physics and Nanotechnology, Kattankulathur Campus.
  • Feb 2015 – July 2017, Research Fellow in School of Materials Science and Engineering, Nanyang Technological University, Singapore.
  • July 2012 – Dec 2014, Postdoc researcher in School of Physics and CRANN, Trinity College Dublin, Ireland.

Professional membership

       1. Life member (L35243) in Indian Science Congress Association (ISCA), Kolkata, India.

       2. Life member (LMB 2965) in Materials Research Society of India (MRSI), India.

Professional activities

  • Reviewer for Materials Horizons, Nanoscale Horizons, Journal of Materials Chemistry A,B, C, Nanoscale, Polymer Science,

 

 
Research Focus
  • Graphene
  • 2D Materials 
  • Sustanable manufacturing 
  • Polymer nanocomposites
  • Processing methods 
  • Sensors and flexible electronics 
  • Energy geneartion and Conversion

Research Summary

My group working on two-dimensional nanosheets and interfaces mainly focused on the sustainable and scalable manufacturing of these emerging materials for fundamental and technological applications. We study the processing methodologies for the production of nanosheets in a liquid and solid form in detail to understand the quality and economy of production which has a path for technology transfer. For this approach, we employ various methods and variety of characterization techniques such as electron microscopy, probe microscopy, spectroscopy, electrical, mechanical and thermal characterization techniques to evaluate the quality of the 2D nanosheets we produce and their physical properties. In the end, we demonstrate applications of graphene and other 2D materials such as in composites, printed electronics, sensors, energy storage and conversion devices.

Research Fascilities 

2DMN Group Fascilities 

1. Probe Sonicator (Sonics and Materials)

2. Bath Sonicator (Branson)

3. Centrifuge with fixed angle rotors (Thermo Scientific)

4. Weighing balance (Schnmandzu)

5. Safety chemcial cabinet (VWR)

 

SRM Central Facilities (http://www.srmscif.in/products.php)

  • UV-Vis-NIR Absorption Spectrophotometer with Integrating Sphere, Cary 5000.  
  • Raman spectrometer, LabRAM HR Evolution, HORIBA Scientific.
  • Transmission Electron Microscope, JEOL 200F
  • X-ray diffractometer, D8 Advance, Bruker.
  • Nitrogen Adsorption/Desorption Analyzer.

Department of Physics and Nanotechnology Facilities

  • Park XE7 Atomic Force Microscope and accessories

 

 

Group leader: Dr. Eswaraiah Varrla

Ph.D. students:

1. Mr.Abimannan S

Qualification: M.Sc. Physics, Periyar University, Salem, India. 

PhD topic: Exfoliation and processing of nanosheets

E-mail: abimanns@srmist.edu.in 

2. Ms. Vanmathi R

Qualification: M.Sc. Physics, SRM IST, Kattankulathur

PhD topic: Thermal management using 2D materials

E-mail: vr8815@srmist.edu.in  

FYP Students: 

1. Agnus Sunil (3rd Year B.Sc. Physics)

2. Dinesh (3rd Year B.Sc. Physics)

 

Former students

1. H.K. Swathi (phd discontinued)

2. Mr. Aswin (MSc. Physics)

3. Ms. Vanmathi (MSc. Physics)

4. Mr. Arghya Banerjee

5. Ms. Anagha Manohar

 

PhD position 1: Nanocomposites for strctural and Industrial applications

Qualifications: Masters in Physics or Nanotechnology

Skills required : Polymers, ceramic materials, composites and understanding on strcture-property relationships and knowledge in analytical charecterization techniques. 

 

PhD position 2: Development of Energy and Electronic low-dimensional materials

Qualification: Masters in Physics

Skills required: Strong background in Materials and physical properties, Self motivated with strong passion in research.

We welcome students with fellowships such as qualified in GATE/JEST/Inspire etc. Further details on application process candidate can contact me. Interested candidates should submit a CV, a cover letter electronically to eswarail@srmist.edu.in

Postdoc position: One position (INSPIRE, N-PDF etc) to work on 2D materials and Nanocomposites. We will be happy to help you if you are interesterd to submit proposal under these schemes. For further information, please contact me. 

 

Funding 

2020-2022

1. DST Indo Russia bilateral project on Cross-linked Heterostructures of h-BCN Nanowalls and Two-Dimensional Nanosheets, 2020-2022, ~25 lakhs.

2018-2020

1. SRM start up grant 4 Lakh Indian Rupees for "Production and Processing of two dimesnsional layered materials"

2. SRM start up grant, 10.46 Lakh Indian Rupees for "Production and Processing of two dimesnsional layered materials" 

 
Research Output
  • Total number of published and granted patents: 3
  • Total number of published articles: 22
  • Total number of national and International conference presentations: 18
  • Number of invited departmental seminars across universities: 9
  • Total number of citations: 3802 as of Jan 2021
  • h-index:16

Google Scholar: https://scholar.google.com.sg/citations?user=-mcDe0gAAAAJ&hl=en

Researcher ID:   E-4480-2010, http://www.researcherid.com/rid/E-4480-2010

ORCID: 0000-0003-0246-0695,  http://orcid.org/0000-0003-0246-0695

Scopus ID: 36598077700, https://www.scopus.com/authid/detail.uri?authorId=36598077700

 

2020

1. Sandeep Surya, Saravanan Yuvaraja, Eswaraiah Varrla, Maryam Shojaei Baghini, Vinay S Palaparthy, Khaled N Salama, An in-field integrated capacitive sensor for rapid detection and quantification of soil moisture, Sensors and Actuators B: Chemical, 128542 , 2020.

Black phosphorus for energy applications

  1. Subas Kumar Muduli, Eswaraiah Varrla, Sneha Avinash Kulkarni, Guifang Han, Krishnamoorthy Thirumal, Ovadia Lev, Subodh Mhaisalkar, Nripan Mathews, 2D black phosphorous nanosheets as a hole transporting material in perovskite solar cells, Journal of Power Sources, 2017, 371, 156-161. *equal contribution. 
  2. Subas Kumar Muduli *, Eswaraiah Varrla*, You Xu, Sneha A. Kulkarni, Ankita Katre, Sudip Chakraborty, Shi Chen, Tze Chien Sum, Rong Xu and Nripan Mathews, Evolution of hydrogen by few-layered black phosphorus under visible illumination, Journal of Materials Chemistry A, 2017, 5, 24874-24879. *equal contribution.
  3. Eswaraiah Varrla*, Qingsheng Zeng*, Long Yi and Zheng Liu, Black Phosphorus Nano-sheets: Synthesis, Characterization and Applications, Small, 2016, 12, 3480-3502.

2D Materials exfoliation

  1. S.S. Jyothirmayee Aravind, Eswaraiah Varrla, and S. Ramaprabhu, Facile and simultaneous production of metal/metal oxide dispersed graphene nano composites by solar exfoliation, Journal of Materials Chemistry, 2011, 21, 17094-17097.
  2. S.S. Jyothirmayee Aravind, Eswaraiah Varrla and S. Ramaprabhu, Facile synthesis of one dimensional graphene wrapped carbon nanotube composite by chemical vapor deposition, Journal of Materials Chemistry, 2011, 21, 15179-15182.
  3. Eswaraiah Varrla, S.S. Jyothirmayee Aravind and S. Ramaprabhu, Top down method for Synthesis of Highly Conducting Graphene by Exfoliation of Graphite Oxide using Focused Solar Radiation, Journal of Materials Chemistry, 2011, 21, 6800-6803.  
  4. Eswaraiah Varrla, Keith R Paton, Claudia Backes, Andrew Harvey, Ronan Smith, Joe McCauley and Jonathan N Coleman, Turbulence-assisted shear exfoliation of graphene using household detergent and a kitchen blender, Nanoscale, 6, 2014, 11810-11819.
  5. Paton, K. R.; Eswaraiah Varrla.; Backes, C.; Coleman, J. N. et al., Scalable production of large quantities of defect-free, few-layer graphene, Nature Materials, 2014, 13, 624–630.
  6.  Eswaraiah Varrla, Backes Claudia, Paton Keith, Harvey Andrew, Gholamvand Zahra, McCauley Joe, Coleman Jonathan, Large scale production of size controlled MoS2 nanosheets by shear exfolaition, Chemistry of Materials, 2015, 27, 1129-1139.

Graphene polymer nanocomposites

  1. Eswaraiah Varrla, V. Sankaranarayanan and S. Ramaprabhu, Inorganic nanotubes reinforced polyvinylidene fluoride composites as low-cost electromagnetic interference shielding materials, Nanoscale Research Letters, 2011, 6, 137.
  2. Eswaraiah Varrla, V. Sankaranarayanan and S. Ramaprabhu, Functionalized Graphene-PVDF foam composites for EMI shielding, Macromolecular Materials and Engineering, 2011, 296, 894–898.
  3. Eswaraiah Varrla, Krishnan Balasubramaniam and Sundara Ramaprabhu, Functionalized graphene reinforced thermoplastic nanocomposites as strain sensors in structural health monitoring, Journal of Materials Chemistry, 2011, 21, 12626-12628.
  4. Eswaraiah Varrla, Krishnan Balasubramaniam and S. Ramaprabhu, one-pot synthesis of conducting graphene polymer composites and its electromechanical application, Nanoscale, 2012, 4, 1258-1262.
  5. Eswaraiah Varrla, S.S. Jyothirmayee Aravind, Krishnan Balasubramaniam, Sundara Ramaprabhu, Graphene-Functionalized Carbon Nanotubes for Conducting Polymer Nanocomposites and Their Improved Strain Sensing Properties, Macromolecular Chemistry and Physics, 2013, 214, 2439-2444.

Graphene Nano-lubricants

  1. Eswaraiah Varrla, V. Sankaranarayanan and S. Ramaprabhu, Graphene based engine oil nanofluids for tribological applications, ACS applied materials and Interfaces, 2011, 3, 4221–4227.

US Patents

  1. S. RamaprabhuEswaraiah Varrla and S.S. Jyothirmayee Aravind, Production of graphene using electromagnetic radiation, Grant: US8828193B2, Application No: US 13/226,321.
  2. S. Ramaprabhu, Eswaraiah Varrla, S.S. Jyothirmayee Aravind and Krishnan Balasubramanian, Graphene Functionalized Carbon Nanotube Polymer Composites and Methods for their Preparation and Use, Grant: US9944774B2, PCT/IB2013/050144.
  3. S. RamaprabhuEswaraiah Varrla, S.S. Jyothirmayee Aravind and, Graphene composites with dispersed metal or metal oxide, US Patent application, 13/956,807.

Book Chapter

  1. Rupali Nagar, Eswaraiah Varrla, Bhaghavathi P. Vinayan, Chapter 11: Conjugated polymer and nanocrystal nanocomposites for photocatalytic hydrogen production and organic contaminants degradation (Book Name: Multi-Functional Photocatalytic Materials for Energy, Elsevier, 2018, Woodhead Publishing, Paperback ISBN: 9780081019771.

 

Materials Science,

Classical Mechanics,

Structure and Properties of Materials, 

Elements of Nanoscience and Nanotechnology 

Atomic Physics and Spectroscopy

 

 

Opportunities:

  • Interested candidates can email group leader by mentioning the candidate’s research interests in a cover letter along with his/her CV.
  • You are most welcome to join our group through INSPIRE fellowship/CSIR-NET/GATE and SERB-NPDF if you are interested to work in 2D materials and nanocomposites. 
  • Keep follow us in knowing more updates on positions for project assistants and Ph.D. positions. Useful link for Ph.D. admission to SRM, URL address: https://applications.srmist.edu.in/ph-d

Contact

Dr. Eswaraiah Varrla
Research Assistant Professor
Department of Physics & Nanotechnology
SRM Institute of Science and Technology,
Kattankulathur 603203,
Chengalpattu, Tamil Nadu, India.

Email: eswarail@srmist.edu.in 

Personel Home page: https://sites.google.com/srmist.edu.in/eswar-research-group/home