In this work, the new refined mineral platelets-like morphology of simonkolleite based particles described by Shemetzer et al. (1985) H 2 O n a n o -p l a t e l e t s r e v e a l e d a significant and singular H 2 gas sensing characteristics. The operating temperature was f o u n d t o p l a y a k e y r o l e on the sensing properties of simonkolleite. The effect of temperature o n the simo nkolleite sample as a hydrogen gas sensor was studied by recording the change in resistivity of the film in presence of the test gas. The results on the se ns it iv it y and respo nse t ime a s per co mpari so n to ear lie r repo r ted Zn O based sensors are indicated and discussed.

We fabricate a one-dimensional constriction in a shallow, δ-doped GaAs/AlxGa1−xAs two-dimensional electron gas, by locally oxidizing the surface using an atomic force microscope. The channel exhibits ballistic conduction with up to seven conductance plateaus, quantized in units of 2e2/h. The dependence of the device conductance on dc bias voltage reveals the energy separation of the first two subbands to be ΔE1,2=5.5(±0.3) meV, which allows ballistic conduction to be observed up to a temperature of 20 K. A lateral electric field, combined with the hard-walled confinement due to the insulating lines, allows manipulation of the electron wave function in a way which is not possible with surface-gated devices.

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Highly crystalline Au-VO 2 nanocomposite thin films were prepared on Corning glass substrates by reactive radiofrequency inverted cylindrical magnetron sputtering (ICMS). It is a low cost potential coating technology for the production of large area uniform nanocomposite thin films exhibiting plasmonic properties. This paper reports the synthesis and feasibility of reliably reproduced high quality of Au-VO 2 by ICMS. Structural, morphological, interfacial analysis and optical properties of synthesized Au-VO 2 nanocomposite thin films are reported.