Effect of Measurement System Configuration and Operating Conditions on 2D Material-Based Gas Sensor Sensitivity

Jongwon Ryu; Seob Shim; Jeongin Song; Jaeseo Park; Ha Sul Kim; Seoung-Ki Lee; Jae Cheol Shin; Jihun Mun; Sang-Woo Kang

doi:10.3390/nano13030573

Effect of Measurement System Configuration and Operating Conditions on 2D Material-Based Gas Sensor Sensitivity

Nanomaterials (Basel). 2023 Jan 31;13(3):573. doi: 10.3390/nano13030573.

Authors

Jongwon Ryu¹, Seob Shim¹, Jeongin Song^{1

2}, Jaeseo Park^{1

3}, Ha Sul Kim², Seoung-Ki Lee⁴, Jae Cheol Shin⁵, Jihun Mun¹, Sang-Woo Kang^{1

3}

Affiliations

¹ Advanced Instrumentation Institute, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea.
² Department of Physics, Chonnam National University, Gwangju 61186, Republic of Korea.
³ Precision Measurement, University of Science and Technology, Daejeon 34113, Republic of Korea.
⁴ School of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea.
⁵ Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, Republic of Korea.

Abstract

Gas sensors applied in real-time detection of toxic gas leakage, air pollution, and respiration patterns require a reliable test platform to evaluate their characteristics, such as sensitivity and detection limits. However, securing reliable characteristics of a gas sensor is difficult, owing to the structural difference between the gas sensor measurement platform and the difference in measurement methods. This study investigates the effect of measurement conditions and system configurations on the sensitivity of two-dimensional (2D) material-based gas sensors. Herein, we developed a testbed to evaluate the response characteristics of MoS₂-based gas sensors under a NO₂ gas flow, which allows variations in their system configurations. Additionally, we demonstrated that the distance between the gas inlet and the sensor and gas inlet orientation influences the sensor performance. As the distance to the 2D gas sensor surface decreased from 4 to 2 mm, the sensitivity of the sensor improved to 9.20%. Furthermore, when the gas inlet orientation was perpendicular to the gas sensor surface, the sensitivity of the sensor was the maximum (4.29%). To attain the optimum operating conditions of the MoS₂-based gas sensor, the effects of measurement conditions, such as gas concentration and temperature, on the sensitivity of the gas sensor were investigated.

Keywords: gas sensors; measurement systems; test platforms; testbed; two-dimensional materials.

Grants and funding

This research was supported by the development of core technologies for advanced measuring instruments funded by Korea Research Institute of Standard and Science (KRISS—2022—GP2022-0011), and was supported by the establishment on national metrology infrastructure of gas materials for semiconductor manufacturing funded by Korea Research Institute of Standard and Science (KRISS—2022—GP2022-0003).