All-Dry Transferred ReS₂ Nanosheets for Ultrasensitive Room-Temperature NO₂ Sensing under Visible Light Illumination

Abstract

For gas sensing applications, most of the reported two-dimensional (2D) materials are suffering from relatively low sensitivity and high limit of detection (LOD) at room temperature. In this work, we selected rhenium disulfide (ReS2) nanosheets to fabricate ReS2 transistor-based gas sensors (RTGSs) with ultrahigh sensitivity and low LOD toward nitrogen dioxide (NO2). The ReS2 nanosheets with different thicknesses were prepared via mechanical exfoliation and all-dry transfer method. Under 405 nm light illumination at room temperature (25 °C), the fabricated gas sensors showed a significant enhancement of the response with full reversibility toward ppb level NO2 (response of 9.07 at 500 ppb, a LOD of 50 ppb). In particular, the total response and recovery time of the RTGS was revealed to be less than 4 minutes (55 and 180 s, respectively), which is one of the top three shortest response and recovery times toward ppb level NO2 of the reported 2D material-based room-temperature gas sensors so far. Via Raman spectrometry, Kelvin probe force microscopy (KPFM), and X-ray photoelectron spectrometry (XPS), the structure and gas sensing mechanism of the materials were systematically investigated. It was confirmed that the electrons transfer from the ReS2 surface to NO2 molecules, inducing the hole doping of ReS2, which consequently increased the sensor resistance. Moreover, the concentration of the photogenerated carriers in ReS2 would accordingly be promoted by light illumination, which accounts for the substantial light enhancement of the gas sensing performance of RTGSs.

Electrochemical Exfoliation of Naturally Occurring Layered Mineral Stibnite (Sb2S3) for Highly Sensitive and Fast Room‐Temperature Acetone Sensing

“…All gas sensing tests of the AGSs were carried out at room temperature in ambient condition using a homemade gas sensing system as illustrated in our previous work. [ 35 ] Figure a showed the successive dynamic response of the fabricated sensors toward acetone with concentrations ranging from 10 to 800 ppm. The response of the AGSs increased significantly from 0.28 to 8.2 with the acetone concentration increasing from 10 to 800 ppm.…”

A Photovoltaic Self‐Powered Gas Sensor Based on All‐Dry Transferred MoS2/GaSe Heterojunction for ppb‐Level NO2 Sensing at Room Temperature

“…According to the transient response characteristic of the heterojunction toward 500 ppb under 12 mW cm −2 405 nm light illumination (Figure S6 , Supporting Information), the response and recovery time is respectively 23 and 178 s, which is one of the top three shortest response and recovery time toward ppb‐level NO 2 at room temperature among the reported 2D material‐based gas sensors so far. [ 24 , 32 ]…”

Enhanced Selectivity in Volatile Organic Compound Gas Sensors Based on ReS2-FETs under Light-Assisted and Gate-Bias Tunable Operation

“…The work function difference between the ReS 2 ( W ReS 2 ) and the AFM tip ( W tip ) determines the surface potential, also known as potential contact difference (CPD). In this regard, the CPD signals measured in numerous sections of the ReS 2 reflect their respective work functions. , Figure a,b shows the KPFM image of the ReS 2 device and its surface potential profile before VOC gas exposure, respectively (measured along the green line, whereby the surface potential is measured from that of the SiO 2 surface). Figure c–f displays the surface potential profile after acetone, methanol, ethanol, and IPA exposure, respectively.…”