A Low‐Power CuSCN Hydrogen Sensor Operating Reversibly at Room Temperature

Abstract

Hydrogen is attractive as an abundant source for clean and renewable energy. However, due to its highly flammable nature in a range of concentrations, the need for reliable and sensitive sensor/monitoring technologies has become acute. Here a solid-state hydrogen sensor based on solution-processable p-type semiconductor copper thiocyanate (CuSCN) is developed and studied. Sensors incorporating interdigitated electrodes made of noble metals (gold, platinum, palladium) show excellent response to hydrogen concentration down to 200 ppm while simultaneously being able to operate reversibly at room temperature and at low power. Sensors incorporating Pd electrodes show the highest signal response of 179% with a response time of ≈400 s upon exposure to 1000 ppm of hydrogen gas. The experimental findings are corroborated by density functional theory calculations, which highlight the role of atomic hydrogen species created upon interaction with the noble metal electrode as the origin for the increased p-type conductivity of CuSCN during exposure. The work highlights CuSCN as a promising sensing element for low-power, all-solid-state printed hydrogen sensors.

Antisolvent Treatment on Wet Solution‐Processed CuSCN Hole Transport Layer Enables Efficient and Stable Perovskite Solar Cells

“…All powder samples share similar diffraction peaks, and an enhanced peak intensity of DEE‐washed CuSCN powder was revealed, which is attributed to the improved crystallinity of CuSCN after DEE treatment due to the removal of the DES solvent. [ 62 ]…”

Self-Powered Thermoelectric Hydrogen Sensors Based on Low-Cost Bismuth Sulfide Thin Films: Quick Response at Room Temperature

“…Table shows the critical sensing characteristics of recently reported representative TE hydrogen sensors, such as response and recovery time. It is evident that the TEH sensors reported in this work respond and recover faster than most reported TE hydrogen sensors. ,,,,,,,− In addition, to compare material characteristics, we collected the LD50 values (median lethal dose) and prices of various elements contained in the most used materials of the TEH sensors, which were normalized to the price of 99.99% Te (Figure S7).…”

Mixed-dimensional Heterojunction by 3D CdS Nanowire Arrays Bridged with 2D WSe2 for Ultrafast Photoelectric Gas Sensor

“…[6,7] Therefore, highly sensitive sensors that can work reliably at room temperature (RT) are urgently needed. [8,9] Two-dimensional (2D) materials with ultrathin thickness, have been widely investigated in electronic devices, [10,11] photodetectors [12,13] and gas sensors [14,15] due to their high speci c surface area and thickness-dependent electrical properties, high carrier mobility, and wide spectral absorption range. [16][17][18] In particular, 2D materials are among the best candidates for gas sensors that can work at RT with minimum energy consumption.…”