Ph.D, MSc, B.Ed., BSc

Dr. Asha R. Pai received her Ph. D. from the department of Physics in 2016 and continues to serve as Assistant Professor (Sr. Gr.) at the Department for Physics, Amrita School of Arts and Sciences, Amrita Vishwa Vidyapeetham, Amritapuri Campus. Her major research focus was on the synthesis and characterization and investigation of the influences of various synthesis techniques on properties of different nano materials like metal oxides, carbon based materials, core shell nano structures, etc. She has worked on natural Dye sensitized solar cells and Immunosensor and has various papers on the topic. She also owns the credit of Indian Patent (626/CHE/2014) “Method of preparing reduced graphene oxide” and holds the position of peer-reviewed of various reputed journals to her credit. Presently her work is focused on biosynthesis giving thrust to nano magnetic composites, Nano-bio photonics and organic electronics materials.

Honors and Awards

  • Elsevier Outstanding contribution in Reviewing
    Solar Energy Journal, 2018
  • State Level Eligibility test for Assistant Professorship
    SLET- 2016 Tamil Nadu
  • Certificate of Appreciation
    Amrita Vishwa Vidyapeetham, Amritapuri Campus
  • Certificate of Appreciation (Amala Bharatam clean up drive Nov 2012)
    Govt. of Kerala
  • State Eligibility test – SET- 2005

Research Experience

Title – Nanomaterial- synthesis, characterisation and application to Dye sensitised solar cells and immunosensor
Thesis Advisor: Dr. Bipin Nair
Amrita Vishwa Vidyapeetham, Amritapuri (2016)
Principle Investigator -- Studies on Surface and electrical properties of graphene/graphene oxide-nano metal/ metal oxide hybrid materials for the application in immune sensor
Funded by Government of India Ministry of Human Resource Development (MHRD)National Mission on Education Through Information and Communication Technology (NME-ICT) (No. F.5-29/2007-DL)
Indian Nano electronic Users Program (INUP),
Center for excellence in Nanoelectronics, IIT Bombay



  • “Nanocrystalline ZrO2-PEG thin films sensitized with natural dye chlorophyll extracted from green leaves of Chromolaena Odorata”, Annual Nanophotonics Workshop 2009, 27th – 28th February, 2009.  (Poster presentation)

Conferences and Workshops Attended

  • Science Academies, 61st Refresher course in experimental physics, Dept. of Physics, Amrita Vishwa Vidyapeetham, Amritapuri, 16th June – 1st July, 2014. (State)
  • Two Week ISTE – Workshop on Introduction to Research Methodology, 25th June – 4th July 2012, (National)
  • INUP Hands-on training workshop, CEN, IIT Bombay, 23rd – 27th April 2012, (National)
  • NANOBIO-2012, ACNSMM, Kochi, 21st -23rd February, 2012 (International conference).
  • Lecture Workshop on Recent trends in Chemical Sciences, Dept. of Chemistry, Amrita Vishwa Vidyapeetham, Amritapuri, 26th – 27th August, 2011.
  • Proteomics and Genomics Workshop, Amrita School of Biotechnology and Institute of Bioinformatics, Bangalore, Amritapuri, 18th – 19th November 2011.
  • 21st Kerala Science Congress, Kollam, 28th – 31st January 2009 (State)
  • National Seminar on Women in Science: A career in Science, CUSAT, Kochi, 5th April, 2008 (National)
  • International Conference on Solar Cells (IC- SOLACE 2008), Dept. of Physics, CUSAT, Kochi, 21st – 23rd January, 2008 (International conference)
  • National Conference on Thermo Physical Properties, Amrita Vishwa Vidyapeetham, Amritapuri, 20th – 24th September, 2007. (National)

Professional Affiliations

  • INUP project Investigator, CEN, IIT Bombay,

Professional Service

Peer-Reviewed Articles for:

  • Journal of Nanoparticle research


  • Life member of Photonic Society of India


Publication Type: Patent

Year of Publication Title


Asha R. Pai and Dr. Bipin G. Nair, “Method of preparing reduced Graphene Oxide”, U.S. Patent Indian Patent 3250792019.

Publication Type: Journal Article

Year of Publication Title


Asha R. Pai and Dr. Bipin G. Nair, “Synthesis and characterisation of Sb-doped ZrO2 and TiO2 nanoparticles”, International Journal of Microstructure and Materials Properties, vol. 14, no. 3, pp. 286-298, 2019.[Abstract]

The present study aims at the synthesis and structural characterisation of Sb-doped titania and zirconia nanoparticles using a modified precipitation synthesis method. The produced nanoparticles were characterised using various techniques such as UV-Visible spectroscopy, Scanning electron microscopy, Transmission electron microscopy and Dynamic light scattering. The crystallite sizes were obtained to be <20 nm for Sb-doped ZrO2 and <10 nm for Sb-Doped TiO2 which was very evident from the Transmission electron microscope images. The hydrodynamic sizes in the range of 100 nm using Dynamic light scattering method were also evaluated for the assessment for biological application. The optical band gap was found out to be 3.21 eV for Sb-Doped TiO2 and 3.87 eV for Sb-doped ZrO2.

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Asha R. Pai and Dr. Bipin G. Nair, “Biosynthesis of γ-Fe2O3@ CuO core–shell nanoclusters using aqueous extract of Sesbania grandiflora Linn fresh leaves, its characterisation, and antimicrobial activity studies against Staphylococcus aureus strains”, IET Nanobiotechnology, vol. 12, no. 3, pp. 365-370, 2017.[Abstract]

The present study reports an eco-friendly and rapid method for the synthesis of core-shell nanoclusters using the modified reverse micelle method. It is a green synthetic method which uses Sesbania grandiflora Linn extract which acts as a reducing and capping agent. It is observed that this method is very fast and convenient and the nanoclusters are formed with 5-10 min of the reaction time without using harsh conditions. The core-shell nanoclusters so prepared were characterised using UV-Vis spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Further, their effective antibacterial activity towards the gram-positive bacteria Staphylococcus aureus was found to be due to their smaller particle size.

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Asha R. Pai, Pillai, A. M., Jayapraksh, A., and John, A., “A Comparative Study of Plant Mediated Synthesis of Silver Nanoparticles from Fresh Leaf Extracts of Gracina Gummi-Gutta L., Cynodon Dactylon L. and Bauhinia Acuminata and Their Antimicrobial Activity Studies”, Nano Biomedicine and Engineering, vol. 8, pp. 288-296, 2016.[Abstract]

Metallic nanoparticles traditionally synthesized by wet chemical synthesis techniques used chemicals used which were quite often toxic and flammable. So a reliable and eco-friendly process for synthesis of metallic nanoparticles has become an important step in the field of nanotechnology. Plant extracts are eco-friendly and are economic and efficient alternatives for the large-scale synthesis of nanoparticles. The present study is planned to compare the biosynthesis of silver nanoparticles using the fresh leaf extracts of three potential plants with high medicinal value such as Gracinia gummi gutta L. (Gracinia cambogia), Cynodon dactylon L. and Bauhinia acuminata. A rapid reduction of silver ions leading to the formation of stable silver nanoparticles in solution in 5 minutes at room temperature as compared to that on heating was studied. The UV-Visible spectrum of silver nanoparticles in aqueous solution shows an absorbance peak around 435 nm due to surface plasmon resonance. Transmission electron microscope images showed the particle size as around 10 nm and their hydrodynamic size were obtained to be around 100 nm. This is a first attempt to perform eco-friendly synthesis of silver nanoparticles using fresh green leaves of Gracinia gummi-gutta L and produced the maximum yield which may benefit various industries with wide range of applications. These biologically synthesized silver nanoparticles were tested for antibacterial activity against three human pathogens such as Escherichia coli, Pseudomonas aeroginosa, and Staphylococcus aureus. An effective synthesis of silver nanoparticles using aqueous leaf extracts of Gracinia gummi-gutta L. was there by investigated. More »»


Asha R. Pai, “Green Synthesis and Characterizations of Silver Nanoparticles Using Fresh Leaf Extract Of Morinda Citrifolia And Its Anti-Microbial Activity Studies”, International Journal of Pharmacy and Pharmaceutical Sciences, vol. 7, no. 3, pp. 459-461, 2015.[Abstract]

Objective: To develop a rapid method of synthesis of silver nanoparticles (Ag NPs) using the fresh aqueous leaf extract of Morinda Citrifolia from 0.1 M AgNO3 solution, to characterize the resulting Ag NPs and also compare their antimicrobial activity with those of standard drugs against human pathogenic bacteria. Methods: 25 ml of the aqueous extract was added to 25 ml of 0.1 M aqueous AgNO3 at room temperature. The mixture was stirred continuously for 5-10 minutes. The reduction was completed with the appearance of brownish-black colored dispersion. The resulting nanoparticles were characterized using UV-Vis absorption spectra and Particle size analysis (DLS method). Further the Antimicrobial activity was compared with the drugs against S. aureus and P. aureginosa strains using the disk diffusion method. Results: The formation of Silver nanoparticles was confirmed with the help of UV-Vis absorption spectra at ≈ 425 nm and particle size as approximately 100 nm using Particle size analysis (DLS method). The anti-microbial activity of the Ag NPs so synthesized was studied against human pathogens in wound infections such as S. aureus and P. aureginosa strains. The inhibitory activity for Ag NPs was compared with those of known drugs such as tetracycline, Ceftazidime and Amikacin at 30 mcg. The inhibitory activity of the Synthesized Ag NPs was found pronounced against P. aureginosa strains. Conclusion: A rapid method of synthesizing Ag NPs has been developed by using the fresh leaf extract of Morinda Citrifolia and it was found that the extract is a potential reducing agent to produce stable Ag NPs. The research provides a new input to the development of anti-microbial agent.

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Publication Type: Conference Paper

Year of Publication Title


Asha R. Pai, Shankar, K., N., A., and Suresh, J., “Fabrication of Solution-Processable, highly transparent and conductive electrodes of graphene by the method of spin coating (Virtual Presentation)”, in Innovative applied energies (IAPE-2019), 2019.


Asha R. Pai, Parvathy,, and Dr. Bipin G. Nair, “Biosynthesis of ZnO@Ag from Gracinia Cambogia linn and its structural Characterisation using XPS (Poster)”, in 5th International conference on Nanoscience and Nanotechnology-ICONN 2019, 2019.


Asha R. Pai, “Synthesis of Reduced Graphene oxide using a Novel exfoliation techniques and its characterizations”, in Second International Symposium on Semiconductor Materials and Devices, ISSMD-2 (Poster presentation), Jammu and Kashmir, India , 2013.


Asha R. Pai, “A Novel route to reduced graphene oxide using pencil graphite: its characterization and application in immunosensor”, in International conference on Nanoscience and Nanotechnology, ICONN- 2013 (Oral presentation), SRM University, Tamilnadu, India, 2013.


Asha R. Pai, “Study of Conversion Efficiency of Dye sensitized solar cells using Nanocrystalline ZrO2-TiO2 binary oxide sensitized with Chlorophyll dye extracted from the leaves of Chromolaena Odorata as photo electrodes and reduced graphene oxide as counter electrodes”, in International Conference on Nanomaterial for Frontier Applications & Indo-Norwegian Workshop on Advanced Materials for Solar cell Applications, ICNFA 2013 (Oral Presentation), Coimbatore, Tamil Nadu, India, 2013.


Asha R. Pai, “A Study of Two dimensional Heterostructure using Functional Graphene Nanosheets decorated with and without metal nanoparticles and Cationic Polyelectrolyte for Immunosensor Application”, in Amrtia BIOQUEST (Poster presentation), Amrita Vishwa Vidyapeetham, Amritapuri, 2013.


Asha R. Pai, “Synthesis and Characterization of Graphite oxide from Pencil lead”, in International Conference on Nanomaterial and Nanotechnology, ICNANO – 2011 (Poster Presentation), University of Delhi, India, 2011.

Publication Type: Patent

Year of Publication Publication Type Title
2014 Patent Asha R. Pai & Bipin G. Nair, Method of preparing reduced graphene oxide", Indian Patent, No. 626/ CHE/ 2014, Patent filed: February 2014, Application published: August 2015