Development of highly sensitive, high-speed hybrid gas sensors using nano-carbon electrodes and polymeric functional materials

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K13972
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Electron device/Electronic equipment
• Research Institution: Shinshu University
• Principal Investigator: ITOH Eiji 信州大学, 学術研究院工学系, 教授 (50303441)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: カーボンナノチューブ / ポリイミド / 湿度センサ / ガスセンサ / ナノ誘電体 / 有機半導体 / MISデバイス

Outline of Final Research Achievements

We have developed printed capacitive humidity sensors with highly gas permeable carbon nanotube top electrodes using solution techniques. The hydrophobic, porous carbon nanotube network was suitable for gas permeation, and the response of the capacitive humidity sensors showed extremely fast and highly sensitive. We developed measurement system and it enabled us to vary the ambient relative humidity within 0.02 s. It was revealed that the response time was almost proportional to the square of the thickness of the polyimide dielectric layer, d, and the sensitivity was inversely proportional to d. The rise time decreased to 40 ms. This is suitable for use in high-speed humidity sensors to realize a real-time humidity and breath-sensing measurement system. An very sensitive acetone sensors were obtained by the nano-hybrid sistem of alumina nanorods, nano-catalysis, and organic semiconductors. Sub-ppm response was successfully obtained by p-type air-stable organic semiconductor.

Free Research Field

有機エレクトロニクス、ナノ誘電体