以氨基酸为晶体生长控制剂合成多级纳米结构的硫化铟空心微球(英文)

Hierarchically Nano-structured In_2S_3 Hollow Microspheres Synthesized Using Amino Acids as Crystal Growth Modifiers

以水热方法制备具有多级纳米结构的In2S3空心微球.通过对不同反应时间产物的跟踪表征,证明微球中空结构的形成归因于Ostwald ripening机理.空心微球的壳层由In2S3的纳米粒子或纳米片组成,In2S3空心球的紫外可见光谱蓝移以及荧光光谱在约385 nm的强发射和364 nm的弱发射,均显示了纳米尺度In2S3晶体的量子局限效应.以不同的氨基酸作为晶体生长修饰剂,可以选择性地制备不同表面形貌的In2S3空心微球,显示了氨基酸的不同功能团在In2S3晶体生长过程中对表面形貌的控制作用.

Hierarchically nano-structured In2S3 hollow microspheres were synthesized by a hydrothermal method and the hollowing effect was attributed to an Ostwald ripening process. Using different amino acids as crystal growth modifiers, In2S3 with different surface morphologies, such as raspberry-like, urchin-like, and flower-like hollow microspheres, were selectively fabricated. The shells of the microspheres were composed of nanosized particles or nanoflakes of In2S3. These results demonstrate that amino acids with different functional groups, such as --NH2, --COOH, and --SH, can induce the formation of different indium sulfide nanostructures. A blue shifted UV band in the UV-Vis spectrum as well as a strong emission at ca 385 nm and a weak emission at ca 364 nm in the photoluminescence （PL） spectrum of In2S3 hollow microspheres indicate strong quantum confinement because of the presence of nanocrystalline particles. Using different amino acids as crystal growth modifiers, microspheres with different surface morphologies were fabricated. These results demonstrate that amino acids with different functional groups can induce the formation of different indium sulfide nanostructures.