“Physical” adsorption on single crystal zinc oxide

Solvothermal growth of ZnO

“…It is known that the ZnO surface does adsorb molecules, such as CO 2 , CO, O 2 , H 2 , etc., as revealed in the work by Göpel and Esser [90,91]. The formation of a highly conductive layer on the surface of highly resistive ZnO crystals was reported by Markevich et al [92] and Schmidt et al [93].…”

An innovative zinc oxide-coated zeolite adsorbent for removal of humic acid

“…Extensive research effort has been undertaken to improve further their physicochemical properties, which are directly associated with the efficiency of zeolites for the removal of HA and other pollutants from water [11][12][13][14][15]. Furthermore, since ZnO could dissociate hydrogen in a heterogeneous manner [18][19][20], an appropriate matrix tailored by ZnO will increase the amount of positively charged groups on the matrix. As a result, we chose zeolite 4A as a matrix and developed ZnO-coated zeolite adsorbents.…”

Characterization of ZnO Nanobelt-Based Gas Sensor for ${\rm H}_{2}$, ${\rm NO}_{2}$, and Hydrocarbon Sensing

“…The gas sensing mechanism in these materials is governed by the reactions which occur at the sensor surface between the thin-film sensitive layer and the target gas molecules. It involves chemisorption of oxygen on the oxide surface followed by charge transfer during the reactions of oxygen with target gas molecules [6]. The adsorbed gas atoms inject electrons into or extract electrons from the semiconducting material, depending on whether they are reducing or oxidizing agents, respectively [7].…”