نتایج جستجو برای: gas cvd
تعداد نتایج: 261518 فیلتر نتایج به سال:
An emerging electronic material as one of transition metal dichalcogenides (TMDCs), tungsten disulfide (WS2) can be exfoliated as an atomically thin layer and can compensate for the drawback of graphene originating from a gapless band structure. A direct bandgap, which is obtainable in single-layer WS2, is an attractive characteristic for developing optoelectronic devices, as well as field-effe...
In this study, carbon nanotubes (CNTs) were grown directly in the pores of micro porous pyrex membranes and consequently ceramic membranes with very fine pores and high porosity were achieved. Our experiment was done in two stages. Initially cobalt powder with different percent was homogeneously mixed with pyrex powder. In order to produce row membranes, each of these mixtures were compacted in...
Vertically aligned single-walled carbon nanotubes (SWNTs) up to 5 microns thick as shown in Fig 1 were produced by an alcohol CVD process [1]. In contrast to the first report of CVD growth of vertically aligned SWNTs [2], hydrogen gas was supplied only during the heating-up stage with the improved background vacuum condition. A time-progressive investigation of the growth process was studied by...
We describe two example pilot efforts to help define new thermoluminescent dosimeter media. The first concerns ZnS:Mn nanophosphors, prepared by chemical precipitation using zinc and sodium sulfate, doped with manganese sulfate at concentrations varying from 1 to 3mol. The second concerns chemical vapor deposited diamond, produced as a thin film or as amorphous carbon on a single-crystal silico...
Non-classical crystallization, in which charged nanoparticles (NPs) are the building blocks of film growth, has been extensively studied chemical vapor deposition (CVD). Here, behavior silicon oxide films by two-step growth process, where NPs generated gas phase at high temperature and deposited as low temperature, was CVD process. Although we supplied SiH4, H2, N2, turned out to be oxide, is a...
The top surface of carbon nanotube (CNT) “forests” produced by thermal chemical vapor deposition (CVD) often has a tangled morphology, owing to the self-organization CNTs at initial stage CVD process. Removal this “crust” layer, without damaging intrinsic microstructure CNT forest is key step for further applications. This paper studies tailored use Ar/O2 plasma etching modify morphology multi-...
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