Ultrahigh humidity sensitivity of graphene oxide

Hengchang Bi, Kuibo Yin, Xiao Xie, Jing Ji, Shu Wan, Litao Sun, Mauricio Terrones, Mildred S. Dresselhaus

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Abstract

Humidity sensors have been extensively used in various fields, and numerous problems are encountered when using humidity sensors, including low sensitivity, long response and recovery times, and narrow humidity detection ranges. Using graphene oxide (G-O) films as humidity sensing materials, we fabricate here a microscale capacitive humidity sensor. Compared with conventional capacitive humidity sensors, the G-O based humidity sensor has a sensitivity of up to 37800% which is more than 10 times higher than that of the best one among conventional sensors at 15%-95% relative humidity. Moreover, our humidity sensor shows a fast response time (less than 1/4 of that of the conventional one) and recovery time (less than 1/2 of that of the conventional one). Therefore, G-O appears to be an ideal material for constructing humidity sensors with ultrahigh sensitivity for widespread applications.

Original languageEnglish (US)
Article number2714
JournalScientific reports
Volume3
DOIs
StatePublished - Oct 1 2013

All Science Journal Classification (ASJC) codes

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    Bi, H., Yin, K., Xie, X., Ji, J., Wan, S., Sun, L., Terrones, M., & Dresselhaus, M. S. (2013). Ultrahigh humidity sensitivity of graphene oxide. Scientific reports, 3, [2714]. https://doi.org/10.1038/srep02714