Effect of Zn Doping in CuO Octahedral Crystals towards Structural, Optical, and Gas Sensing Properties

Abstract

Monodispersed CuO octahedral crystals were successfully synthesized using a low-temperature co-precipitation method. Zinc doping in CuO created surface defects that enhanced oxygen adsorption on the surface crucial for gas sensing applications. Pure and Zn-doped CuO sensor films were realized using the doctor blade method. The sensor films showed selective response towards a low concentration of NO2 at a lower operating temperature of 150 °C. Doping with Zn causes the resistance of the sensor film to decrease due to the enhancement of charge carriers with an analogous improvement in the sensor response. The observed decrease in sensor resistance agreed well with the findings of the work function studies. Zinc doping resulted in an increase in work function by 180 meV which, after NO2 exposure, was found to increase by a further 130 meV, attributed to the oxidizing behavior of the test gas.

Development of enduring interstitial defects in Mg-doped CuO thin films

“…This deviation may be due to the difference in the reaction mechanism of both Mg and Cu salts. 18 The distribution of the elements within the films was obtained using elemental mapping. Fig.…”

Electrical, optical and nonlinear optical process in spray pyrolyzed Zn:CuO nanostructures for optoelectronic device applications

“…Since the purpose of this study was to focus on the change in properties as we increase the concentration of dopants, the amount of solution sprayed for each concentration was maintained at the same level throughout the deposition of the films. On doping, the crystallite size has a decreasing trend, which reduces from 25.05 nm to 15.67 nm; as zinc ions provide strain to the lattice, it hinders the growth of CuO crystal, resulting in a decrease in crystallite size [17]. The increase in dislocation when doping with zinc might be due to the introduction of lattice imperfection, increased strain, and disorder in the films.…”

Effect of Zn Doping on Antibacterial Efficacy of CuO Nanostructures

“…The Zn‐doped CuO nanostructures PL intensity was lower than that of the pure CuO crystals, indicating that electron‐hole recombination had been suppressed. This is explained by an increase in charge carriers (holes) following Zn doping in CuO, which is indicative of an increase in the adsorbed oxygen species [46] …”

“…This is explained by an increase in charge carriers (holes) following Zn doping in CuO, which is indicative of an increase in the adsorbed oxygen species. [46]…”