Various strategies aimed at enhancing gas Erlotinib sensing characteristics such as gas response and selectivity Inhibitors,Modulators,Libraries have been reported for n-type oxide semiconductors, which include control of the grain size [6,7], morphologies [8], charge carrier concentration [9], catalytic additive(s) [10], and inter-nanostructure contacts [11] of the sensing materials. The results of these studies suggest that selecting additives that can change the charge carrier concentration, catalytic function, and morphology is very advantageous for enhancing or modifying their gas sensing characteristics. However, studies on the gas sensing characteristics of p-type oxide semiconductors are in their early stages, and most researchers have reported on the gas sensing characteristics of pure p-type oxide semiconductors without additives.
Inhibitors,Modulators,Libraries For example, the design of highly sensitive and selective CuO sensors using oxide Inhibitors,Modulators,Libraries additives has barely been investigated. In contrast, the gas sensing characteristics of various undoped CuO nanostructures including thin films [12,13], nanoparticles [14�C16], nanowires [17�C19], nanorods [20], nanoribbons [21], nanosheets [15], worm-like structures [22], and hierarchical structures [23] have been studied extensively.In this study, highly crystalline CuO nanosheets, Cr-doped CuO nanosheets, Inhibitors,Modulators,Libraries and Cr-doped CuO nanorods were prepared by a facile chemical route without using a surfactant or capping agent, and their gas sensing characteristics were studied. The doping of CuO nanostructures with Cr significantly enhanced their response and selectivity toward NO2.
The main focus of this study was investigating the reasons for the enhanced response and selectivity toward NO2 in relation to the Cr-doping-induced changes in the morphology, surface AV-951 area, resistance in air, and catalytic property.2.?Experimental Section2.1. Preparation of CuO and Cr-Doped CuO NanostructuresCuO nanosheets were prepared by the following procedure: CuCl2?2H2O (17.05 g, >99%, Kanto Chemical, Japan) was dissolved in deionized water (100 mL). Then, 50% NaOH aqueous solution (32 g, Samchun Chemical, Korea) was instantaneously poured into the solution, which caused the precipitation of bright blue Cu hydroxide. The precipitate slurry was heated to 100 ��C at a heating rate of 1.67 ��C/min. Then, the temperature of the slurry solution was maintained at 100 ��C for 30 min.
During the reaction, the bright blue Cu-hydroxide GW 572016 precipitate was converted into dark brown CuO nanosheets. CuO nanostructures doped with Cr were prepared by the following procedure: CuCl2?2H2O (17.05 g) and CrCl3?6H2O (0.267 g or 0.799 g, >98%, Aldrich, USA) were dissolved in deionized water (100 mL). 50% NaOH aqueous solution (32 g) was instantaneously poured into the solution. The hydroxide precursors were converted into dark brown Cr-doped CuO nanostructures by heating the precipitate slurry solution at 100 ��C for 30 min.