The Heterostructures of CuO and SnOx for NO2 Detection

Abstract

Controlling environmental pollution is a burning problem for all countries more than ever. Currently, due to the increasing industrialization, the number of days when the limits of air pollutants are over the threshold levels exceeds 80–85% of the year. Therefore, cheap and effective sensors are always welcome. One idea is to combine such solutions with cars and provide real-time information about the current pollution level. However, the environmental conditions are demanding, and thus the developed sensors need to be characterized by the high 3S parameters: sensitivity, stability and selectivity. In this paper, we present the results on the heterostructure of CuO/SnOx and SnOx/CuO as a possible approach for selective NO2 detection. The developed gas sensors exhibited lower operating temperature and high response in the wide range of NO2 and in a wide range of relative humidity changes. Material characterizations and impedance spectroscopy measurements were also conducted to analyze the chemical and electrical behavior.

CdSe/ZnS quantum dots as a booster in the active layer of distributed ternary organic photovoltaics

“…The element T (capacitance) of the CPE (CPE-T) is responsible for the polarization of the sample in various areas of the material structure and on the electrodes. The mechanisms of ionic or electronic conductivity are represented by the resistance R [ 54 ].…”

Developing GLAD Parameters to Control the Deposition of Nanostructured Thin Film

“…Figure 11 shows the results of tests of layers obtained in a similar process, with and without the use of additional stabilisation. The sensor layers were placed in the test chamber, where gas (nitrogen dioxide) was dosed in a variable concentration, as previously presented [43]. As can be observed, the layers exhibited a similar electrical resistance.…”

“…Unstable conditions during the GLAD process could result in an uneven buildup of material as the tallest columns grew at the expense of the smaller elements [41]. Previously, we tested the impact of various argon-oxygen mixtures on copper/copper oxide growth [42], the impact of GLAD sputtering parameters on the crystal structure, morphology, and gas-sensing properties of the tungsten trioxide films [12], the influence of the GLAD nuclei process to ultra-thin copper oxide films [3], as well as to the gas-sensing properties of the copper oxide-tin oxide heterostructures [43]. Herein, a brief report on the deposition system and further improvements was proposed and the given sensing results are shown to confirm the previously obtained results.…”

Catalytic Systems in the Reduction of Nitrogen Oxide Emissions in Diesel-Powered Trucks

“…In recent years, the number of motor vehicles in circulation has increased, and consequently, there has been an increase in emissions of gases from combustion. Thus, it is necessary to monitor the emissions of these gases and study methods and technologies to reduce such emissions [1][2][3].…”