Creation of nanocrystals through a solid-solid phase transition induced by an STM tip
Creation of nanocrystals through a solid-solid phase transition induced by an STM tip
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DOI：
10.1126/science.274.5288.757
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发表时间：
1996-11-01
期刊：
影响因子：
56.9
通讯作者：
Lieber, CM
中科院分区：
文献类型：
--
作者：
Zhang, J;Liu, J;Lieber, CM
利用扫描隧道显微镜（STM）在液氦温度下在2 H-TaSe 2晶体表层制备了尺寸从7到100 nm的T相二硒化钽（TaSe 2）纳米晶。原子分辨率的图像阐明了T-和H-相区域之间的结构变化，并被用来开发一个原子模型，该模型描述了通过固-固相转变从H-相晶体前体生产T-相纳米晶体的途径。这些纳米晶体的尺寸依赖性可能会导致更好地理解小结构中的电荷密度波的物理特性。
A scanning tunneling microscope (STM) was used to fabricate T-phase tantalum diselenide (TaSe2) nanocrystals with sizes ranging from 7 to more than 100 nanometers within the surface layer of 2H-TaSe2 crystals at liquid helium temperature. Atomic-resolution images elucidate the structural changes between T- and H-phase regions and were used to develop an atomic model that describes a pathway for the production of T-phase nanocrystals from the H-phase crystal precursor through a solid-solid phase transition. The size-dependent properties of these nanocrystals may lead to improved understanding of the physics of charge density waves in small structures.