I obtained my first degree in Materials Science from Indian Institute of Technology, Kharagpur (India) and PhD on Raman Spectroscopy of Carbon Nanostructures from University of Cambridge (UK).

 In 2003 I joined Prof. Sir Mark Welland’s Group in Nanoscience Centre, Cambridge (UK) and developed a prototype super-resolution Raman spectroscopy and imaging system in reflection mode.

 In 2005, I joined the National Physical Laboratory to establish a technical area on Analytical and Optical Nanoprobes to develop measurement science to position the UK for emerging bio nanotechnologies. During this period, I received several awards for best papers, initiated the international standardization for Raman spectroscopy and started the international conference on tip-enhanced Raman spectroscopy. I have regularly given invited talks in international scientific conferences as well as industrial meetings.

 In 2017 I joined Swansea University to build research activities on laser analytics and nanoscience. Areas of interest includes nanobiotechnology, advanced materials and sensors. 

Areas of Expertise

  • Raman Spectroscopy
  • Tip-enhanced Raman Spectroscopy
  • Graphene and 2D Materials
  • Coherent Raman Imaging of Biological Systems
  • Sensors and Digital Molecular Diagnostics


  1. Carvalho, B., Wang, Y., Mignuzzi, S., Roy, D., Terrones, M., Fantini, C., Crespi, V., Malard, L., Pimenta, M. Intervalley scattering by acoustic phonons in two-dimensional MoS2 revealed by double-resonance Raman spectroscopy Nature Communications 8 14670
  2. Kumar, N., Zoladek-Lemanczyk, A., Guilbert, A., Su, W., Tuladhar, S., Kirchartz, T., Schroeder, B., McCulloch, I., Nelson, J., Roy, D., Castro, F. Simultaneous topographical, electrical and optical microscopy of optoelectronic devices at the nanoscale Nanoscale 9 8 2723 2731
  3. Kumar, N., Spencer, S., Imbraguglio, D., Rossi, A., Wain, A., Weckhuysen, B., Roy, D. Extending the plasmonic lifetime of tip-enhanced Raman spectroscopy probes Physical Chemistry Chemical Physics 18 19 13710 13716
  4. Su, W., Kumar, N., Mignuzzi, S., Crain, J., Roy, D. Nanoscale mapping of excitonic processes in single-layer MoS2 using tip-enhanced photoluminescence microscopy Nanoscale 8 20 10564 10569
  5. Su, W., Kumar, N., Dai, N., Roy, D. Nanoscale mapping of intrinsic defects in single-layer graphene using tip-enhanced Raman spectroscopy Chemical Communications 52 53 8227 8230

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  • CH-127 Chemical Practice

    This module will introduce students to the three broad employment areas for chemistry: research, teaching or industrial positions. The lecture portion will cover fundamental aspects of being a professional chemist including safety, report writing, project management, and teaching skills. Students will then spend 60 hours with research faculty, on an industrial field trip or serving as a teacher's aide. Assessment will be by coursework and a written report.

  • CH-241 Analytical Chemistry

    This course will cover theory and applications of qualitative and quantitative analytical chemistry, with particular emphasis on quantitative chemical analysis. The students will learn about various processes and measurements involved in a chemical analysis, and about statistical analyses of the data acquired during such experiments. The topics related to both classic (e.g., titrations) and modern analytical techniques (e.g., separations and spectroscopy) will be covered. The module will have a variety of formative assessment opportunities and summative assessments that include writing of technical reports, a presentation, homework, workshops, and an exam.

  • CH-346 Medicinal Chemistry Project

    3rd year projects are the opportunity to bring all you've learnt during your degree together and apply that knowledge to solve a problem. In Swansea these projects can be embedded in active research groups across the colleges of science, engineering or medicine, allowing you to build a network and experience in your chosen specialism within the chemical sciences. These projects are your opportunity to demonstrate to employers that you have a full understanding of your course and are able to direct your own studies, manage an independent research project and effectively communicate your findings. This selection suggests an interest in a project embedded within a research group in engineering, focusing on materials chemistry or chemical engineering

  • CH-349 Integrated Topics in Chemistry

    This module gives students the opportunity to explore options within Chemistry, giving opportunity to apply prior learning to advanced research topics and allowing students to pursue more specialised topics related to their research interests and aligned with the research areas represented within the Department. Study areas available will include advanced spectroscopic techniques, the application of instrumentation in chemistry, as well as more advanced synthetic pathways and a return to more integrated study of the traditional branches of organic/inorganic/physical chemistry. Classes will be supported with workshops which will help students gain a thorough understanding of the integrated nature of Chemistry at an advanced level. Where possible, topics will be taught using relevant examples from primary literature, encouraging students to evaluate and appraise a range of primary literature sources and locate appropriate new sources. The module is designed to be flexible to allow the content to vary with the research areas represented within the Department.


  • Improving vibrational spectroscopy prospects in frontline clinical diagnosis. (current)

    Other supervisor: Prof Catherine Thornton
  • Untitled (current)

    Other supervisor: Prof Kenith Meissner