Dr. Ajay Achath Mohanan

Lecturer
School of Engineering

ajay.mohanan@monash.edu
+603 5514 6252
Room 2-4-34
ORCID

Personal statement

Dr Ajay's current research is focused on design and fabrication of flexible high-performance ZnO-based surface acoustic wave (SAW) sensors integrated with zinc oxide (ZnO) nanostructures as sensing medium. In the past, he has worked on design and micro-fabrication of rigid lithium niobate-based SAW devices using a novel UV-LED photolithography technique, and on-chip integration of self-seeded ZnO nanowires as sensing medium on these devices using thermal evaporation method conducted at above 600 °C. The transition from rigid to flexible SAW sensors integrated with ZnO nanostructures requires the growth of highly piezoelectric ZnO thin film on flexible polymer substrates as medium for SAW propagation and a low-temperature growth method for on-chip integration of ZnO nanostructures. The growth of piezoelectric ZnO thin film on flexible polymer substrates is performed using RF magnetron sputtering in the Micro and Nano Devices Lab at Monash University Malaysia, and low temperature hydrothermal method is adopted for on-chip growth of ZnO nanowires as sensing medium.

In the past, Dr Ajay has published his research in high-impact-factor ISI Q1 and Q2 journals such as MDPI Sensors, Microelectronic Engineering, Materials Research Bulletin and Journal of Micromechanics and Microengineering. He has currently acquired an FRGS grant for a duration of 2 years from Ministry of Higher Education, Malaysia for conducting research on flexible SAW sensors integrated with ZnO nanostructures as sensing medium.

Academic degrees

  • Doctor of Philosophy in Engineering, Monash University Malaysia, 2016
  • Degree in Electrical and Computer Systems Engineering (Hons), Monash University Malaysia, 2009

Professional affiliations

Member of National Professional Bodies

  • Board of Engineers (BEM) Malaysia, Member

Research Interests

Surface acoustic wave (SAW) sensors, on-chip growth of nanostructures as SAW sensing medium

Research Projects

Title: On-chip Growth of Resonant ZnO nanowires as Sensing Medium to Devise Highly Sensitive Wearable Surface Acoustic Wave Sensors for Biomedical Applications

In this project, investigations will be carried out on techniques to enhance the performance of flexible ZnO/polyimide layered SAW devices through alterations in the device structure such that they can sustain on-chip growth of ZnO nanostructures. Further, investigations will be conducted on the possibility of site-specific patterned integration of precisely tuned resonant ZnO nanowires as sensing medium on the high-performance flexible SAW devices through hydrothermal synthesis. The study could act as a vital step towards realization of coupled resonance phenomenon for acoustic wave devices at nanoscale.

Education

Units taught

ECE2071 - Computer Organisation and Programming

ECE3091 - Engineering Design

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Local grants

  • Investigation into effect of wave energy confinement using Bragg reflector towards realizing highly sensitive flexible surface acoustic wave sensors integrated with nanostructures, Ajay Achath Mohanan, Tan Chee Pin, Narayanan Ramakrishnan, 2018-2020, Fundamental Research Grant Scheme (FRGS), Ministry of Higher Education, Malaysia

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