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Kim, Kyungnam; Yoo, Dongsuk; Choi, Hyekyoung; Tamang, Sudarsan; Ko, Jae-Hyeon; Kim, Sungwoo; Kim, Yong-Hyun; Jeong, Sohee
Angewandte Chemie (International ed.), March 7, 2016, Letnik: 55, Številka: 11Journal Article
Wet chemical synthesis of covalent III‐V colloidal quantum dots (CQDs) has been challenging because of uncontrolled surfaces and a poor understanding of surface–ligand interactions. We report a simple acid‐free approach to synthesize highly crystalline indium phosphide CQDs in the unique tetrahedral shape by using tris(dimethylamino) phosphine and indium trichloride as the phosphorus and indium precursors, dissolved in oleylamine. Our chemical analyses indicate that both the oleylamine and chloride ligands participate in the stabilization of tetrahedral‐shaped InP CQDs covered with cation‐rich (111) facets. Based on density functional theory calculations, we propose that fractional dangling electrons of the In‐rich (111) surface could be completely passivated by three halide and one primary amine ligands per the (2×2) surface unit, satisfying the 8‐electron rule. This halide–amine co‐passivation strategy will benefit the synthesis of stable III‐V CQDs with controlled surfaces. InP colloidal tetrahedral nanocrystals were synthesized through a simple acid‐free approach using tris(dimethylamino) phosphine and indium trichloride dissolved in oleylamine. Their formation was attributed to the unique stabilization of the In‐rich (111) facets by co‐passivation with halide and primary amine.
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