The enhanced optical property of chemical passivated n type GaSb
In the paper, Te-doped n type GaSb was passivated by (NH4)2S, the optical and surface properties of passivated GaSb were investigated by PL and AFM. After passivation treatment, the luminescence intensity of GaSb was enhanced. The passivation time would also affect luminescence intensity and the surface smooth of GaSb.
Effects of H2S adsorption on surface properties of GaAs {100} grown in situ by MBE
We report here results dealing with the effects of H2S adsorption on crystallographic and electronic surface properties of GaAs {100} layers grown in situ by molecular beam epitaxy (MBE). The adsorption was studied by AES, LEED and ELS. At room temperature, the adsorption is found to be very dependent on the electron irradiation, whereas this effect vanishes at 700 K. This behavior indicates that the mechanism of adsorption is temperature dependent: H2S is adsorbed mainly in molecular form at low temperature (300 K) and in dissociated form at higher temperature (700 K). Adsorption of the molecular form leads to a disordered layer, whereas the dissociative adsorption process induces a (2×1) reconstruction of the GaAs surface near the saturation coverage. This structural reordering is also associated with changes observed in the loss spectra. Moreover, Auger measurements indicate that it is characterized by significant changes in arsenic and gallium lines: it is most likely that the (2×1) structure correspo...
CNC Desktop Vertical Machining Bench Design and Cooling Fluid Application
Today's manufacturing technologies, the human work force is used and at least a minimum level of margin of error is used in CNC machines. Desktop CNC machine tools and CNC machine tools are developed in parallel with the development of personal computers. This study provides CNC training institutions for education, small and medium-sized enterprises for commercial purposes use the low-cost desktop machine has been designing and manufacturing of CNC vertical machining was carried out. Desktop CNC machine tools and production capacity to handle the kind of material was applied to increase the cooling fluid. Through A199 and Fe37 the cooling fluid application desktop CNC machine tools, such as processing of materials that are difficult to successfully processed. Keywords—CNC, Desktop CNC Machine, CNC Design