SiOx microforest-like structures have been produced on Si (100) surfaces by pulsed excimer laser irradiation in air. Scanning electron microscopic observations have indicated these structures, which are composed of aggregated nanoparticles, to be 1-5 μm in diameter and 10-20 μm high, and to have the appearance of trees. XPS analysis has shown them to be composed of a-SiOx (1
The effect of argon ion bombardment on interface of silver and high oriented pyrogenic graphite (HOPG) was investigated by atomic force microscopy. The Ag/HOPG interface morphology has been explored as a function of irradiation time. It can be seen that the size of crystal particle on HOPG is almost unchanged with increase of irradiation time, while the size of Ag crystal particle in part of the terrace increased and became highly ordered. There is no obvious mixing between Ag and HOPG, and Ag particles in nanoscale are isolated on HOPG surface. This will result in the reduction of depth resolution of the surface analysis by ion sputtering technique.
A device based on a mono or multilayers films of a nickel dithiolene-stearyl alcohol complex built with the Langmuir- Blodgett (LB) technique has been investigated as a N2H4 gas detector. The films deposited on an aluminum electrode and the changes in the electrical properties of the film when exposed to the N2H4 gas were tested. It was found that there still a well response when the device exposed 0.5 ppm N2H4 gas at the room temperature, and the changes of electrical conductive of the film is roughly linear with N2H4 gas concentration in the lower concentration. The experimental results indicated the response time and recovery time of the sensor are less than 30 seconds.