Chemosensitive properties of electrically conductive Cu(I) compounds at room temperature

Abstract

a b s t r a c tChanges of the electrical conductance of a number of inorganic copper(I) conductive compounds including Cu 12 Sb 4 S 13 , Cu 2 O, CuI, CuBr and CuCl were tested on exposure to different gases and vapors, including ammonia, nitrogen monoxide, octanethiol, hydrogen chloride, acetic acid, formic acid, ethanol, humidity and piperidine. The sensitivity of the resistivity to ammonia was estimated as 2.7%/ppm for CuBr, 1.4%/ppm for Cu 2 O, 1.2%/ppm for CuCl, 0.013%/ppm for CuI, but only 0.0028%/ppm for Cu 12 Sb 4 S 13 . The highest selectivity for ammonia was observed for Cu 12 Sb 4 S 13 . The sensitivity patterns of these materials to the tested gases and vapors are very different which makes them applicable for sensor arrays for identification and quantification of these species.

Semiconducting 2D Copper(I) Framework for Sub-ppb-Level Ammonia Sensing

“…Chemiresistive gas sensing materials have drawn considerable attention due to their simplicity, cost-effectiveness, ease of use, and rapid nature. Copper­(I) iodide CPs have gained significant interest because of their unique structural and photophysical properties. , Recently, there has been a growing exploration of the Cu­(I) CP as a chemiresistive sensor for various gases and volatile organic compounds because of its high stability and semiconducting nature along with low-cost synthesis. − We have recently reported a Cu­(I) CP chemiresistive sensor with excellent methanol sensing capabilities, while Wu et al have designed Cu­(I) CPs for NO 2 sensing. , The rapid surge in ammonia (NH 3 ) concentration, due to its extensive usage in pharmaceutical, chemical, and fertilizer industries and others, has raised serious concerns regarding environmental and human safety, owing to the inherent toxicity, flammability, and corrosiveness of NH 3 . − Three primary sources that contribute to both direct and indirect exposure to NH 3 in the environment are atmospheric deposition, nitrification, and combustion. − Prolonged exposure to NH 3 poses a risk of causing severe life-threatening diseases, while higher concentrations can even result in fatality . Additionally, exhaled NH 3 serves as a critical biomarker for kidney and liver diseases .…”