We report the seed/catalyst-free growth of ZnO on multilayer graphene by thermal evaporation of Zn in the presence of O2 gas. The effects of substrate temperatures were studied. The changes of morphologies were very significant where the grown ZnO structures show three different structures, i.e., nanoclusters, nanorods, and thin films at 600°C, 800°C, and 1,000°C, respectively. High-density ver...

Sputtering of ZnO is a well-known technique.'9 The application of sputtered thin films of ZnO has mainly been as surface acoustic wave transducers. To our knowledge nobody has yet used these films as detectors for UV radiation. Measurements of the intensity of UV radiation, for example in medical applications in connection with UV irradiation of the skin, are very inaccurate due to the lack of ...

The photomechanical effect induced by periodically varying sub-bandgap illumination in thin ZnO films deposited on oxidized Si has been demonstrated for the first time. The efficiency of this effect is at least one order of magnitude higher as compared to the photothermal activation of Si. Thus it can be considered as a powerful optical drive for resonant sensors. A phenomenological model of th...

This work presents a novel technique to deposit ZnO thin films through a metal vacuum evaporation technique using colloidal nanoparticles (average size of 30 nm), which were synthesized by our research group, as source. These thin films had a thickness between 45 and 123 nm as measured by profilometry. XRD patterns of the deposited thin films were obtained. According to the HRSEM micrographs wo...

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Three methods were used to fabricate ZnO-based room temperature liquid petroleum gas (LPG) sensors having interdigitated metal-semiconductor-metal (MSM) structures. Specifically, devices with Pd Schottky contacts were fabricated with: (1) un-doped ZnO active layers; (2) Pd-doped ZnO active layers; and (3) un-doped ZnO layers on top of Pd microstructure arrays. All ZnO films were grown on p-type...

Thin films of ZnO have been deposited on glass and silicon substrates by the pulsed laser deposition technique employing a KrF laser ~l5248 nm!. The influence of the deposition parameters, such as substrate temperature, oxygen pressure, and laser fluence on the properties of the grown films, has been studied. All the films grown over a rather wide range of deposition conditions were found to be...

The present review paper reports on the optimization attempts, so far, on two simultaneously occurring properties of zinc oxide (ZnO) thin films (electrical conductivity and optical transparency). These two properties are discussed in the context of zinc oxide material thin films as transparent conducting oxides (TCOs) for photovoltaic (PV) applications. They are very critica...

Gallium nitride ~GaN! thin films with a wurtzite structure were grown on fused silica ~FS! substrates by pulsed laser ablation of a liquid gallium target in the presence of ammonia gas. X-ray diffraction measurement shows a single c-axis orientation for the GaN film grown with a thin ~,1000 Å! zinc oxide ~ZnO! film as an alignment layer. There is a great improvement in the surface morphology as...