Hydrothermal treatment for the marked structural and optical quality improvement of ZnO nanowire arrays deposited on lightweight flexible substrates

Characterization and modeling of a ZnO nanowire ultraviolet photodetector with graphene transparent contact

“…6 One particular advantage of ZnO nanowires is that it is a low-cost material that can be solution-synthesized on a vast variety of substrates. [7][8][9] A giant photoconductive gain of 10 8 leading to very high detector responsivity has been reported in single nanowire ZnO photodetectors and attributed to hole trapping at the nanowire surface due to oxygen chemisorption. 10 It has been demonstrated that the nanowire surface passivation allows to reach high detectivity values, while maintaining high responsivity of the detector.…”

Formation of highly crystallized ZnO nanostructures by hot-water treatment of etched Zn foils

“…For all samples, the peak at 438 cm À 1 that corresponds to the high-E 2 mode of the non-polar optical phonons can be attributed to the hexagonal wurtzite phase; this is further evidence that the ZnO nanostructures formed have good crystallinity [17,18]. Furthermore, a broad peak at 561 cm À 1 can be observed, which corresponds to the E 1 (LO) mode of ZnO, associated with oxygen deficiency [1].…”

“…A blue-shift was observed after hot-water treatment for 12 h (the peak in the visible region shifted to approximately 520 nm compared with about 580 nm for the sample hot-water treated for 4 h). However, no emission peak within the green region was observed after hot-water treatment for 24 h. This may be because the crystal structure rearrangement during dissolution and recrystallization of the ZnO surface reduced the amount of oxygen vacancies available to contribute to the deep-level green emission [17]. Fig.…”

Effects of morphology of nanostructured ZnO on direct electrochemistry and biosensing properties of glucose oxidase

“…Moreover, the strong intensity of the (0 0 2) peak shows that the ZnO NRs were well oriented with the c-axis perpendicular to the ITO substrate, which was consistent with the cross-section SEM analysis. The (0 0 2) peak is located at 2y 1 = 4 34.383 which is close to that of wurtzite ZnO crystal (34.421) [48,49]. Two other diffraction lines were presented and corresponded to the (1 0 0) and (1 0 1) planes of ZnO, but their intensity were much lower than (0 0 2).…”