期刊
ACS NANO
卷 11, 期 11, 页码 11449-11458出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b06164
关键词
FeO nanostructures; scanning tunneling microscopy; strong metal-oxide interaction; interfacial confinement; local work function; local density of states
类别
资金
- Ministry of Science and Technology of China [2016YFA0202803]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17020200]
- Natural Science Foundation of China [21473191, 21573224, 91545204]
- Thousand Talent Program for Young Scientists
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Chemical Sciences, Biosciences and Geosciences [DE-SC0012704]
- Office of Science of the U.S. DOE [DE-AC02-05CH11231]
The controlled fabrication of nanostructures has often used a substrate template to mediate and control the growth kinetics. Electronic substrate-mediated interactions have been demonstrated to guide the assembly of organic molecules or the nucleation of metal atoms but usually at cryogenic temperatures, where the diffusion has been limited. Combining STM, STS, and DFT studies, we report that the strong electronic interaction between transition metals and oxides could indeed govern the growth of low-dimensional oxide nanostructures. As a demonstration, a series of FeO triangles, which are of the same structure and electronic properties but with different sizes (side length >3 nm), are synthesized on Pt(111). The strong interfacial interaction confines the growth of FeO nanostructures, leading to a discrete size distribution and a uniform step structure. Given the same interfacial configuration, as-grown FeO nanostructures not only expose identical edge/surface structure but also exhibit the same electronic properties, as manifested by the local density of states and local work functions. We expect the interfacial confinement effect can be generally applied to control the growth of oxide nanostructures on transition metal surfaces. These oxide nanostructures of the same structure and electronic properties are excellent models for studies of nanoscale effects and applications.
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