Facile template-free hydrothermal fabrication of ZnO hollow microspheres for gas sensing applications

Green biosynthesis and characterization of zinc oxide nanoparticles usingCorymbia citriodoraleaf extract and their photocatalytic activity

“…Zinc oxide (ZnO) is a well-known n-type semiconductor with a band gap of 3.37 eV and excitation binding energy of 60 meV, hence is considered as one of the best photocatalysts to degradation of pollutant in water (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11). In order to enhance the photocatalytic property of ZnO, nano-sized ZnO have been synthesized to increase the surface area and enhance the photocatalytic activity.…”

Nanostructured SnO2 Microsphere-Based Gas Sensor Array Enhanced by Molecular Imprinting for Methanol and Ethanol Discriminative Detection

“…As a typical n-type oxide, the gas sensing mechanism of SnO 2 is related to the changes in electrical conductivity caused by chemical reactions between the adsorbed oxygen species and target gases. , At an elevated temperature in air, oxygen molecules from the air will adsorb on the surface of SnO 2 and form various chemisorbed oxygen species, including O 2(ads) – , O (ads) – , and O (ads) 2– , depending on the working temperature, by trapping free electrons in the conduction band. This process will lead to a decrease in the concentration of free carriers on the surface of SnO 2 and the formation of an electron depletion layer, resulting in the increase of resistance . The reactions can be expressed by the following eqs : , …”

“…This process will lead to a decrease in the concentration of free carriers on the surface of SnO 2 and the formation of an electron depletion layer, resulting in the increase of resistance. 36 The reactions can be expressed by the following eqs 3456: 37,38…”

CeO2 hollow nanospheres synthesized by a one pot template-free hydrothermal method and their application as catalyst support

“…Nowadays, many reported works have focused on the facile template-free method for the synthesis of hollow structure. 15 For instance, Shang and co-workers 16 fabricated the submicrometer-sized anatase TiO 2 hollow spheres through a template-free solvothermal route using TiCl 4 as a raw material and a mixture of alcohols-acetone as solvent. Another example can be found in the work of Ma et al, 17 who synthesized the double-wall Cu 2 O hollow spheres by a facile hydrothermal process in a ternary solvent system including water, ethanol and glycerol.…”