Indium selenide nanosheets for photoelectrical NO2 sensor with ultra sensitivity and full recovery at room temperature

UV-light-assisted gas sensor based on PdSe2/InSe heterojunction for ppb-level NO2 sensing at room temperature

“…Third, the electrons trapped by the absorbed NO 2 molecules will be released back to the sensing material after switching off the NO 2 gas, and the NO 2 − (ad) will recombine with photoexcited holes to generate NO 2 (eqn (8)). 29,53 Apart from that, the UV light can reduce the desorption energy barrier and part of the NO 2 − (ad) are directly stimulated by the UV light to form NO 2 (eqn (9)), 12,42 which greatly accelerates the desorption rate of NO 2 and achieves the full recovery at RT.NO 2 − (ad) + h + → NO 2 (gas)NO 2 − (ad) + hv → NO 2 (gas) + e − …”

“…10 Recently, PdSe 2 and InSe have been reported as the promising room-temperature gas sensing materials due to their unique crystal structures and properties. 11,12 Furthermore, the vdWs heterostructures formed by two different TMDs materials can compete with or even be superior to conventional bulk semiconductor junctions and respective 2D constituent because of their atomically sharp interfaces and designed energy band alignments. 13 Recent studies have shown that the vdWs heterostructures devices with outstanding performance have been widely investigated in the fields of photodetectors, field-effect transistors (FETs), solar cells, and room-temperature gas sensors.…”

Rational design of ZnO@ZIF-8 nanoarrays for improved electrochemical detection of H2O2

“…6(e), the linear regression equations of ZnO nanorod arrays and ZnO@ZIF-8 nanorod arrays are I (μA) = 2.70 + 0.0008C (μM) and I (μA) = 5.64 + 0.0048C (μM), and the correlation coefficients ( R 2 ) are 0.996 and 0.992, respectively. In addition, the result of the lower limit of detection (LOD) is based on the ratio of the standard deviation (SD) of the current response to the slope of the calibration curve at a signal-to-noise ratio (SNR) of 3: 36,37…”

Fast and recoverable NO2 detection achieved by assembling ZnO on Ti3C2Tx MXene nanosheets under UV illumination at room temperature

“…47 Zheng et al reported that the InSe nanosheet sensor can achieve rapid and full recovery to NO 2 gas within 169 s under UV illumination. 48 Zhou et al presented the Au-MoS 2 gas sensor, which achieved better sensing properties, including three times the response and full recovery under illumination compared with that in the dark. 49 Wu et al found that the recovery rate of the p-type MoTe 2 gas sensor to different concentrations of NO 2 was significantly improved under UV illumination.…”