Here we report the thermal management of oxide nanowire sensor in both spatial and time domains by utilizing unique thermal properties of nanowires, which are (1) the reduced thermal conductivity and (2) the short thermal relaxation time down to several microseconds. Our method utilizes a pulsed self-Joule-heating of suspended SnO2 nanowire device, which enables not only the gigantic reduction of energy consumption down to ∼102 pJ/s, but also enhancement of the sensitivity for electrical sensing of NO2 (100 ppb). Furthermore, we demonstrate the applicability of the present method as sensors on flexible PEN substrate. Thus, this proposed thermal management concept of nanowires in both spatial and time domains offers a strategy for exploring novel functionalities of nanowire-based devices.
Research Area “Innovative Nano-electronics through Interdisciplinary Collaboration among Material, Device and System Layers”
Research Theme “Ultra Low-power, Muti-functional, and High-sensitivity Sensor Platform Realized by Nano Electric Channel and Thermal Management”
Gang Meng, Fuwei Zhuge, Kazuki Nagashima, Atsuo Nakao, Masaki Kanai, Yong He, Mickael Boudot, Tsunaki Takahashi, Ken Uchida, and Takeshi Yanagida. “Nanoscale Thermal Management of Single SnO2 Nanowire: pico-Joule Energy Consumed Molecule Sensor”. ACS Sensors, Published online 4 July 2016, doi: 10.1021/acssensors.6b00364.
Takeshi Yanagida, Ph.D.
Professor, Institute for Materials Chemistry and Engineering, Kyushu University
Ken Uchida, Ph.D.
Professor, Department of Electrical Engineering, Keio University
Sofia Saori Suzuki, Ph.D.
Green Innovation Group, Department of Innovation Research, JST