排序方式: 共有44条查询结果,搜索用时 15 毫秒
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本文用连续氩离子激光对辉光放电法淀积在二氧化硅层上的氢化非晶硅(a-Si∶H)薄膜进行辐照扫描,使a-Si∶H膜结晶。利用金相显微术和透射电子显微术对結晶薄膜的形貌和結构进行了研究,并用等离子刻蚀技术确定结晶度。激光加工时衬底溫度为240℃,扫描速度为2cm/s,束斑直径大约40μm,交叠50%。经功率为4W激光辐照后,样品表面平整光亮,部分区域巴结晶成多晶,相邻的二次扫描的相间区由于溫度低于结晶溫度,仍为非晶态且易被腐蚀掉。激光功率增至6W和7W时,部分区域受损伤成为非晶、微晶和多晶混合体,而相间区已结晶成多晶。适当选择衬底溫度、激光功率和扫描适度可望获得良好的結晶,它对SOI器件的制作是有意义的。 相似文献
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通过差示扫描量热(DSC)法研究了Cu55Zr30Ti15和Cu50Zr40Ti10大块非晶合金的晶化过程.利用K issinger方程得到了Cu55Zr30Ti15和Cu50Zr40Ti10的晶化激活能,两种非晶的第一晶化激活能分别是349.25 kJ/mol和303.93 kJ/mol.探讨了Zr元素对非晶晶化的影响,发现随着Zr元素替代Cu元素,提高了非晶的第一晶化温度. 相似文献
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《自然科学进展(英文版)》2021,31(4):536-540
Anatase TiO2 nanotubes array (ATONA) has attracted tremendous attention owing to its promising applications in solar cells, water splitting and organic pollutants photocatalytic degradation. However, the activity of ATONAs was greatly suppressed by the grain boundaries existed in the tube walls, which acted as carrier scattering and recombination centers. Herein, we report a novel strategy to prepare array of single crystalline anatase TiO2 nanotubes (SC-ATONAs) with significant enhancement of the photocatalytic activity and UV photo response performance compared to the polycrystalline counterparts. The growth of SC-ATONAs was achieved by establishing a crystallization temperature gradient along the tube wall, which ensured the crystallization started from the nucleation of a single nucleus at the bottom of amorphous TiO2 nanotubes prepared by Ti anodization. These findings pave the way to prepare single-crystalline nanotubes with superior performance for other materials. 相似文献
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