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ZnO nanorods were grown on SiO2 substrates using a two-step process. In the first step, the formation of seed layers was performed. In the second step, the growth of nanorods above the seeds was carried out via three different methods. The used methods were magnetron sputtering and two types of hydrothermal methods. The obtained nanomaterial was characterized by scanning electron microscopy and X-ray...
A growing thirst for highly sensitive and sufficiently selective sensors for extremely harsh conditions can be seen. This fact excludes the use of conventional sensing devices and gives a space for Surface Acoustic Wave sensors with monolithically-integrated electronics. We have chosen the AlGaN/GaN material as a suitable material due to its excellent chemical inertness and stability of piezoelectric...
Simulations of a planar micro Ion Mobility Spectrometer (μIMS) for sensing DMMP and Acetone vapours for security applications are performed. In μIMS ions are discriminated by the application of the proper separation voltages to the electrodes of the system. By simulation, optimum voltages for achieving the proper sensitivity have been obtained.
Essential part of MOS-based hydrogen sensors is constituted by a dipole layer of polarized H atoms at the metal-oxide interface. This layer decreases barrier height of the Schottky diodes or causes a shift in the threshold voltage of the FET devices. Constitutive P - E (dielectric polarization versus external electric field intensity) equation of the dipole ensemble is derived supposing Langmuir-type...
The multilayer compound thin films, consisted of metal oxides (TiO2 and NiO) prepared by dc magnetron sputtering technique, have been studied. The structural, compositional, electrical and gas sensing properties have been investigated by XRD, GDOES and Van der Pauw method considering changes in layout, annealing temperature and addition of Au noble metal catalyst. The Au modified compound oxides exhibit...
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