Confinement of 1D Chain and 2D Layered CuI Modules in K-INA-R Frameworks via Coordination Assembly: Structure Regulation and Semiconductivity Tuning

Abstract

Herein, we present a new series of CuI-based hybrid materials with tunable structures and semiconducting properties. The CuI inorganic modules can be tailored into a one-dimensional (1D) chain and two-dimensional (2D) layer and confined/stabilized in coordination frameworks of potassium isonicotinic acid (HINA) and its derivatives (HINA-R, R = OH, NO 2 , and COOH). The resulting CuI-based hybrid materials exhibit interesting semiconducting behaviors associated with the dimensionality of the inorganic module; for instance, the structures containing the 2D-CuI module demonstrate significantly enhanced photoconductivity with a maximum increase of five orders of magnitude compared to that of the structures containing the 1D-CuI module. They also represent the first CuI-bearing hybrid chemiresistive gas sensors for NO 2 with boosted sensing performance and sensitivity at multiple orders of magnitude over that of the pristine CuI. Particularly, the sensing ability of CuI-K-INA containing both 1D-and 2D-CuI modules is comparable to those of the best NO 2 chemiresistors reported thus far.

Thermodynamically and Kinetically Enhanced Benzene Vapor Sensor Based on the Cu–TCPP–Cu MOF with Extremely Low Limit of Detection

“…In addition, Cu–TCPP–Cu-12 can output a linear response to benzene vapor when the concentration is lower than 1 ppm (Figure h, inset). Thus, the logic LOD of the sensor could be calculated according to the IUPAC method , as follows: LOD = 3 σ S According to eq , where σ and S stand for the standard deviation and slope, respectively, the LOD is determined to be 65 ppb ( y = 0.165 x + 61.167, R 2 = 0.99). The ultralow LOD (65 ppb) of this sensor not only meets the safety standards for benzene in China (103 ppb), the United States (94 ppb), and Europe (70 ppb) but also has better performance compared with other QCM-based benzene sensors − (Figure i).…”

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 .…”