Adsorption and photodesorption of oxygen on the surface and crystallite interfaces of sputtered ZnO films

Multifunctional device based on ZnO:Fe nanostructured films with enhanced UV and ultra-fast ethanol vapour sensing

“…as-grown samples (see Figs. 2 and 3)), which lead to a larger amount of adsorbed oxygen molecules onto the nanocrystallites surface, and as a result to a higher UV response [21,68]. Fig.…”

Process Development and Material Property of ZnO Nanoparticle Suspension by High Frequency Induction

“…Suppose the relationship between τ andγ is a non-linear one, such kind of the fluid is a non-Newtonian Fluid, which can be subdivided into the pseudoplastic fluid (n < 1) and dilatant fluid (n > 1). The A value of pseudoplastic fluid would decrease along with the increase of shear rate, whereas that of the dilatant fluid would increase along with the increase of shear rate (11), (12) . If the fluid can begin to flow only when the exerting shear stress has exceeded a certain value, such shear stress value is called the yield stress of fluid.…”

Effect of ultraviolet illumination on metal oxide resistive memory

“…On the other hand, the treatments such as surface modification, 6 doping, 8 and electrode material engineering 9 have improved RS stability and RRAM performance due to the better controllability of chemisorbed oxygen at surface-related defects. In this regard, the light illumination with the energy higher than the bandgap of metal oxide memory, which modulates the chemisorbed oxygen at surface-related defects via oxygen photodesorption 10 is expected to have impacts on RRAM stability and performance. For example, ZnO with a bandgap of $3.4 eV is sensitive to UV illumination, exhibiting high photogain upon UV illumination.…”

“…The fast saturation in the IRS indicates the less readsorption/photodesorption sites for chemisorbed oxygen on the virgin surface/ interface of Pt(TE)/ZnO. 10 By contrast, a more defective anodic Pt(TE)/ZnO interface in the HRS corresponding to a continuous readsorption/photodesorption process of chemisorbed oxygen leads to a pronounced rise behavior. 18 To further explore the effects of UV illumination on RRAM characteristics, we performed endurance tests of Pt/ZnO/Pt capacitor in dark and under UV illumination.…”