journal article·2017-04Open access

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

Khurram Shehzad, Tianjin Shi, Akeel Qadir, Xia Wan, Hongwei Guo, Ayaz Ali, Weipeng Xuan, Hua Xu, Zhongze Gu, Xinsheng Peng, Jin Xie, Litao Sun, Qiyuan He, Zhen Xu, Chao Gao, You‐Seung Rim, Yaping Dan, Tawfique Hasan, Pingheng Tan, Erping Li, Wenyan Yin, Zhiyuan Cheng, Bin Yu, Yang Xu, Jikui Luo, Xiangfeng Duan

Advanced Materials Technologies· Volume 2· Issue 4

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 H2, O2, N2, and CO2. 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.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Graphene research and applications · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Micro‐Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic Engineering and State Key Laboratory of Silicon Materials Zhejiang University Hangzhou 310027 China

Hangzhou Hikvision Digital Technology Co., Ltd Hangzhou 310052 China

State Key Laboratory of Bioelectronics Southeast University 210096 Nanjing China

College of Material Science Zhejiang University Hangzhou 310027 China

State Key Laboratory of Fluid Power & Mechatronic systems Zhejiang University Hangzhou 310027 China

SEU‐FEI Nano‐Pico Center Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 210096 China

Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA

MOE Key Laboratory of Macromolecular Synthesis and Functionalization Zhejiang University Hangzhou 310027 China

School of Intelligent Mechatronic Engineering Sejong University 209 Neungdong‐ro Gwangjin‐gu Seoul 05006 Republic of Korea

Joint Institute of University of Michigan and Shanghai Jiaotong University 200240 Shanghai China

Cambridge Graphene Centre University of Cambridge Cambridge CB3 0FA UK

State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

College of Nanoscale Science and Engineering State University of New York NY 12203 USA

Institute of Renewable Energy & Environment Technologies University of Bolton Bolton BL3 5AB UK

Funding

National Natural Science Foundation of China

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