期刊
ACS NANO
卷 8, 期 4, 页码 3476-3482出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn406439w
关键词
nanocrystal synthesis; near-infrared photoluminescence; silver indium selenide; anion exchange; air-stable quantum dots; shape-dependent optical properties
类别
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds de Recherche du Quebec-Nature et Technologies (FRQ- NT)
We present the synthesis of air-stable AgInSe2 nanocrystals via thermolysis of an Ag-In-thiolate complex followed by an anion exchange reaction. Evolution of the Ag:In:Se ratio with the reaction time demonstrates progressive incorporation of In3+ in beta-Ag2Se seeds. While their lattice stays in the metastable orthorhombic crystal structure, the final AgInSe2 nanocrystal shape can be spherical, pyramidal, or prismatic depending on reaction conditions. These nanocrystals emit from trap states between 800 and 1300 nm, which is a biologically and technologically important near-infrared range, with a photoluminescence quantum yield up to an order of magnitude of 21%. The appearance of a shoulder within photoluminescence spectra between 845 and 890 nm is correlated to the presence of prismatic nanocrystals. the
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