Sponsor: Orange County Section Jt. Chapter, PE31/IA34
Speaker: Dr. Nirmal Roy

Date: 26 Feb 2026
Time: 05:00 PM PST to 06:15 PM PST
Cost:
Location:
Reservations: IEEE
Summary:
Nano-engineered materials are opening new pathways toward sustainable, high-performance electronic and sensing technologies. This talk presents a comprehensive overview of nanomaterial-based sensor systems and flexible optoelectronic devices, highlighting how structural and interfacial engineering at the nanoscale enables enhanced functionality. The discussion begins with the fundamentals of nanomaterials, including carbon dots and nanocomposites, emphasizing their high surface-to-volume ratio, quantum confinement, and tunable electronic properties. Room-temperature gas sensors based on MoS2–CuO nanocomposites will be presented, demonstrating sensitive and selective acetone detection through engineered heterojunction band alignment. A paper-based enzymatic chemiresistor for point-of-care ethanol breath detection will illustrate the integration of nanomaterials into low-cost, portable healthcare platforms. The talk further explores carbon-dot-decorated ZnO nanorod Schottky diodes fabricated on flexible paper substrates for self-powered UV photodetection. The enhanced rectification behavior, photovoltaic response, and mechanical durability demonstrate the potential of nano-engineered interfaces for flexible and energy-efficient optoelectronics. Collectively, these studies showcase how rational nanomaterial design, interface engineering, and device integration are shaping the next generation of sustainable electronics.

Bio: Dr. Nirmal Roy is an Assistant Professor in the Department of Electronics and Communication Engineering at Motilal Nehru National Institute of Technology (MNNIT) Allahabad, India. He received his Ph.D. from the Indian Institute of Technology (IIT) Guwahati, and his M.Tech. in Microelectronics and VLSI Design from MNNIT Allahabad. His research focuses on nanoelectronics, 2D nanomaterials, gas and biosensors, IoT, POCT devices, optoelectronic devices, flexible electronics, supercapacitors, and VLSI design. Dr. Roy has published extensively in leading international journals, including IEEE Sensors Journal, Chemical Engineering Journal, ACS Applied Materials & Interfaces, Langmuir, Journal of Alloys & Compounds, Journal of Environmental Chemical Engineering, Microsystems & Nanoengineering, Optical Materials, Journal of Physics and Chemistry of Solids, Material Science & Engineering: B, Physica Scripta, etc. He holds two granted Indian patents and has delivered several invited talks at conferences and academic forums. He actively serves as a reviewer for reputed international journals across IEEE, Elsevier, ACS, IOP, and Springer publications.