奈米工程與微系統研究所　書報討論

Seminar of Inst. NanoEngineering and MicroSystems

Prof. Soohwan Jang,

Department of Chemical Engineering,

Dankook University

E-mail : jangmountain@dankook.ac.kr

 GaN based highly sensitive hydrogen sensor for high temperature and humid applications

Abstract

There are great interest in hydrogen as an alternative energy source and a viable energy carrier. Compared to conventional fossil fuels, it is an emission-free fuel that can produce larger heat combustion when reacted with oxygen. Hydrogen gas is extremely reactive with oxygen, and has very low ignition energy of 0.019 mJ. Especially, leaking gas from pressurized container may induce spontaneous flammable ignition due to its negative Joule-Thomson coefficient. Therefore, hydrogen gas sensing systems are essential in various hydrogen related applications. GaN based material system is well-suited to hydrogen sensing because of its wide bandgap for high temperature operation, and mechanical and chemical robustness for device reliability. Many types of devices based on the GaN, including Schottky diodes, metal oxide semiconductor diodes, GaN nanowires and AlGaN/GaN high electron mobility transistors have been developed for fast and sensitive detection of hydrogen. In this talk, hydrogen sensing characteristics of highly sensitive GaN based hydrogen sensors with various crystal planes will be explained. Also, as a dramatic approach to improve the sensitivity of the device, active platinum nanostructure and photo-chemically etched GaN will be discussed. In addition, nano-porous membrane will be introduced for the reliable operation of hydrogen sensor in humid ambient.

Profile

Dr. Soohwan Jang received the B.S. degree from the Department of Chemical Engineering, Seoul National University, Seoul, South Korea, in 2003, and the Ph.D. degree from the Department of Chemical Engineering, University of Florida, Gainesville, FL, in 2007. From 2007 to 2009, he was with Samsung Electronics. He has been a Professor with the Department of Chemical Engineering, Dankook University, since 2009. His research interests include nitride and oxide-based sensors, light emitting diodes, and integrated electronic devices. More than 90 journal papers have been published, and 8 invited talks given at international conferences.

2018年12月17日(週一)，1530－1720，工程一館108室

15:30-17:20 on Dec. 17 (Mon), 2018 in Room 108 of Eng. Building I

Host：Prof. Da-Jeng Yao  djyao@mx.nthu.edu.tw Ext: 42850

Contact：黃微稜 hwleng@mx.nthu.edu.tw  Ext: 33737

TA：李志恩 c27180339@gmail.com