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- W2072381581 abstract "Large PbS protruded cubes, edge- and corner-truncated cubes and octahedra, and perfect octahedra with sizes over 200 nm have been synthesized in aqueous solution. By using two surface oxide-free tungsten probes to contact a clean particle, these PbS nanocrystals displayed facet-dependent electrical conductivity behaviors. Both {110} and {100} faces are highly conductive at applied voltages beyond 4 V, but the {111} faces can remain nonconductive even at 5 V. An asymmetric I–V curve was recorded when electrical contacts were made simultaneously on the {110} and {111} facets of a truncated cube. A modified band diagram of PbS is constructed to account for the observed facet-dependent effect. Density of states plots for varying numbers of PbS surface planes show larger areas of conduction band electron occupancy for the (110) and (100) planes than that for the (111) planes at a layer thickness of 3.0–3.4 nm. The work represents that, for the first time, the facet-dependent electrical properties of an n-type semiconductor nanocrystal are directly probed. Facet-dependent electrical conductivity should be a general semiconductor property and can be exploited to fabricate single-nanocrystal operating electronic components." @default.
- W2072381581 created "2016-06-24" @default.
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- W2072381581 date "2016-02-19" @default.
- W2072381581 modified "2023-10-17" @default.
- W2072381581 title "Facet-Dependent Electrical Conductivity Properties of PbS Nanocrystals" @default.
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- W2072381581 doi "https://doi.org/10.1021/acs.chemmater.6b00274" @default.
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