One-Pot Synthesis of Highly Emissive, Green-to-Red (ZnS) x -Cu0.1 InS1.55 /ZnS Core/Shell Nanoparticles via Surfactant Induced Nucleation Process
A novel synthetic protocol is developed to prepare highly emissive zinc copper indium sulphide (ZCIS) core/shell nanoparticles of configuration of (ZnS) x -Cu0.1 InS1.55 /ZnS via one-pot reaction of Zn(S2 CNEt2 2, CuI, 1-dodecanthiol and In(CH3 COO)3. Although each of these reagents has been exploited for the ZCIS synthesis in previous studies, the superiority of current method lies in that the ZCIS nucleation won't proceed at temperature as high as 180°C until addition of oleylamine ligand to trigger the overall reaction. The as prepared ZCIS core is able to maintain the compositional homogeneity (emission fwhm <95 nm) and similar optical properties during a long period of reaction time (≥ 60 min), so that subsequent cationic exchange can be conveniently carried out to form the ZnS shell. The resulting core/shell alloy nanoparticles all exhibit high emission quantum yield (f > 40%) and emission is tunable from green to red depending on elemental composition. In particular, the green one (∼530 nm), with f ∼;42% is the highest recorded to date. This surfactant induced one-pot reaction also offers scale-up advantage, with 1.6 (green), 2.27 (yellow) and 2.52 (red) grams per reaction being successfully made.
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Document Type: Research Article
Publication date: September 1, 2012
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