Composite Content Influence on Multiwall Carbon Nanotubes-SiO₂ Film Humidity Sensors at AC Testing

Abstract:

MWNT –SiO2 composite film humidity sensors with different MWNTs proportions were fabricated and their performances under alternating current testing signals are investigated. Influence of MWNT content on humidity sensing characteristics of the sensors is explored and explained by vapor adsorption and capillary condensation effect. It is proved that 60% MWNT content sensors have humidity sensitivity of 1500% at 400 kHz testing frequency, much higher than those with other MWNT contents. In sensors’ sensitivity-frequency relation, maximum sensitivity comes from frequency section of 400kHz to 500kHz for sensors with higher MWNTs proportions.

• Periodical: Key Engineering Materials (Volume 503)
• Pages: 451-454
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.503.451
• Online since: February 2012
• Authors: Tuo Li, Xiao Wei Liu, Zhen Gang Zhao
• Keywords: AC Testing, Capillary Condensation, Humidity Sensor, Multi-Walled Carbon Nanotube (MWCNT)

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