نتایج جستجو برای: vacuum evaporation
تعداد نتایج: 67354 فیلتر نتایج به سال:
A technique based on neutron activation has been developed for an extremely high sensitivity analysis of trace elements in organic materials. Organic materials are sealed in plastic or high purity quartz and irradiated at the HFIR and MITR. The most volatile materials such as liquid scintillator (LS) are first preconcentrated by clean vacuum evaporation. Activities of interest are separated fro...
Ordered gold nanoparticle arrays with high lateral density of 6.87 × 1010 nanoparticles cm−2, which are stable up to temperatures of 600 ◦C, were fabricated. To this end, nanoparticles formed by thermal vacuum evaporation of Au were immobilized within the pores of nanoporous silicon wafers prepared by block copolymer lithography coupled with dry plasma etching. Even after high-temperature treat...
The spatially distributed microstructures needed to implement many functionally graded material (FGM) designs are difficult to realize affordably with today's materials synthesis/processing technologies. To address this need, a new directed vapor deposition (DVD) technique has been developed and explored as a potential FGM synthesis tool. The technique exploits supersonic helium jets in combina...
When prepared by conventional evaporation or sputtering, thin films of amorphous silicon contain a large concentration of defects and microvoids.3,4 These give rise to localized states in the energy gap of the material.3,4 Plasma-enhanced chemical vapor deposition (PECVD), using silicon hydrides, significantly reduces the number of defects and thereby lowers the concentration of localized state...
A 2 GHz acoustic phase measurement system has been developed and used for in-situ monitoring of thin film thickness and temperature in silicon wafer processing. Initial evaporation experiments in a vacuum station have shown a film thickness resolution of -1OOO A with a potential resolution to -1 A . The potential of this system for making temperature measurements has also been explored, and ini...
The elemental and structural features of the nitride nanostructured coating produced by vacuum arc evaporation from high-entropy cathode TiHfVNbZr were studied. Using of the complementary methods of elemental analysis (RBS, SIMS and GDMS) allowed to carry out a comprehensive analysis of the elemental composition, namely to determine the chemical composition of the surface layer, to establish th...
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