CUED Publications database

Designing an Efficient Multimode Environmental Sensor Based on Graphene-Silicon Heterojunction

Shehzad, K and Shi, T and Qadir, A and Wan, X and Guo, H and Ali, A and Xuan, W and Xu, H and Gu, Z and Peng, X and Xie, J and Sun, L and He, Q and Xu, Z and Gao, C and Rim, Y-S and Dan, Y and Hasan, T and Tan, P and Li, E and Yin, W and Cheng, Z and Yu, B and Xu, Y and Luo, J and Duan, X Designing an Efficient Multimode Environmental Sensor Based on Graphene-Silicon Heterojunction. Advanced Materials Technologies. p. 1600262. (Unpublished)

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Abstract

By exploiting the adsorbent gaseous molecules induced changes in intrinsic properties of graphene/silicon (Gr/Si) Schottky junction, the authors report a sensitive, low-power consuming, multimode environmental sensor. By combining an array of Gr/Si Schottky diodes with a differential amplifier circuit, the authors are able to not only differentiate the temperature coefficient and humidity sensing, but also monitor the sun-light exposure time. Our device is particularly sensitive toward humidity in both forward and reverse biased, and works in resistive as well as capacitive mode. Sensitivity of our devices reached to 17%, 45%, 26%, and 32% per relative humidity (%RH) for reverse biased, forward biased, resistive, and capacitive modes, respectively. In the reverse mode, the power consumption is as low as 2 nW. Moreover, our sensor response is highly selective, with sensitivity lower than 1% for other gases present in atmosphere including H$_{2}$, O$_{2}$, N$_{2}$, and CO$_{2}$. High sensitivity, low-power consumption, multiple operation modes, and high selectivity promises application of our sensor for industrial and home safety, environmental monitoring such as indoor and outdoor air conditions, process monitoring, and others.

Item Type: Article
Uncontrolled Keywords: environmental sensing graphene; internet-of-things Schottky
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:07
Last Modified: 25 Jun 2020 09:19
DOI: 10.1002/admt.201600262