Prof.  Junhui  Hu
Nanjing University of Aeronautics and Astronautics,  China

Title: Principle, Structure and Characteristics of MOS Gas Sensors Assisted by Ultrasound

Abstract:

The metal oxide semiconductor gas sensor has the merites such as fast response, quick recovery, good durability, long working life, lower cost, and excellent portability. An improvement in its sensitivity and selectivity will definitely widen its application range. The existing methods for improving its sensitivity include the utilization of nano porous sensing materials, doping, optimization of the grains of sensing materials, and UV light irradiation. The existing methods for improving its selectivity include the doping and working temperature modulation. Recently, the author’s research group proposed a new strategy not only capable of significantly raising the sensitivity of MOS gas sensors, but also providing a possibility to identify various reducing and oxidizing target gases. The strategy utilizes ultrasonic radaition to enhance the target gas transfer onto the sesning layer, to change the sensing chanracteristics of a MOS sensor. In this talk, the principle, structure and characteristics of MOS gas sensor systems assisted by ultrasound will be given, as well as their potential applications.    

Biography:

Junhui Hu received the B.E. and M.E. degrees in electrical engineering from Zhejiang University, Hangzhou, China, in 1986 and 1989, respectively, and the Ph.D. degree from the Tokyo Institute of Technology, Tokyo, Japan, in 1997.

He was a research engineer at the Research and Development Center, NEC-Tokin, Sendai, Japan, from 1997 to 1999, a research fellow and Post-Doctoral fellow at Hong Kong Polytechnic University, Hong Kong, from 1999 to 2001, an Assistant Professor at Nanyang Technological University (NTU), Singapore, from 2001 to 2005, and an Associate Professor at the School of Electrical and Electronic Engineering, NTU, from 2005 to 2010. He is currently a Chang-Jiang Distinguished Professor, PRC, and the Deputy Director of the State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing. He has authored or coauthored over 300 papers (including more than 90 full papers in SCI international journals with a citation time >1400 and disclosed patents, and is the sole author of the book Ultrasonic Micro/Nano Manipulations. Also, he has given more than ten keynote/invited speeches in international conferences, and served as general chairman for the international conferences ICMCA 2016 and ICEEAC 2017, and as honorary chairman for IWPMA 2011. His current research interests include novel utilization of vibration, ultrasonic manipulators and actuators, physical effects of ultrasound, etc. Dr. Hu is editorial board member of three international journals. He won the Paper Prize from the Institute of Electronics, Information and Communication Engineers as the first author in Japan in 1998, and was awarded the title of Valued Reviewer for Sensors and Actuators A: Physical and for Ultrasonics.