期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 34, 页码 13487-13496出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b04866
关键词
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资金
- NSF [CHE-1611331]
- NSF DMREF Program [DMR-1629601, DMR-1629361]
- Department of Defense (DOD) Air Force Office of Scientific Research [FA9550-18-1-0099]
- University of Chicago Materials Research Science and Engineering Center - NSF [DMR-1420709]
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [5J-30161-0010A]
- Samsung GRO program
- U.S. Department of Energy, Office of Science [DE-ACO2-06CH11357]
In contrast to molecular systems, which are defined with atomic precision, nanomaterials generally show some heterogeneity in size, shape, and composition. The sample inhomogeneity translates into a distribution of energy levels, band gaps, work functions, and other characteristics, which detrimentally affect practically every property of functional nanomaterials. We discuss a novel synthetic strategy, colloidal atomic layer deposition (c-ALD) with stationary reactant phases, which largely circumvents the limitations of traditional colloidal syntheses of nano-heterostructures with atomic precision. This approach allows for significant reduction of inhomogeneity in nanomaterials in complex nanostructures without compromising their structural perfection and enables the synthesis of epitaxial nano-heterostructures of unprecedented complexity. The improved synthetic control ultimately enables bandgap and strain engineering in colloidal nanomaterials with close to atomic accuracy. To demonstrate the power of the new c-ALD method, we synthesize a library of complex II-VI semiconductor nanoplatelet heterostructures. By combining spectroscopic and computational studies, we elucidate the subtle interplay between quantum confinement and strain effects on the optical properties of semiconductor nanostructures.
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