A new route to very stable water-soluble ultra-small core/shell CdSe/CdS quantum dots
作者： Oleksandr L. Stroyuk , Yaroslav V. Panasiuk , Volodymyr M. Dzhagan , Dmytro I. Solonenko , Steffen Schulze
DOI: 10.1016/J.NANOSO.2015.12.001
关键词: In situ 、 Selenium 、 X-ray photoelectron spectroscopy 、 Raman spectroscopy 、 Analytical chemistry 、 Materials science 、 Ammonia 、 Quantum dot 、 Cadmium selenide 、 Thermal treatment
摘要: Abstract A new synthetic route to water-soluble ultra-small CdSe quantum dots (QDs) is proposed based on using a mixed complex of Cd(II) with ammonia and mercaptoacetate (MA) anions as stabilizer Na 3 SeO stable non-volatile selenium precursor that can be reduced in situ Se 2− by MA. The method facile, reproducible allows gram-scale production QDs the form powders, uniform smooth films concentrated solutions content up 20 m%. At molar MA/Cd(II) ratio 2.25 are characterized an average size around 2 nm narrow distribution, well stability towards oxidation ambient oxygen under light illumination. combined Raman XPS study shows arises from thin layer CdS QD surface formed during post-synthesis thermal treatment. An increase 4.00 results formation species its spectral characteristic resembles earlier reported “magic-size” (CdSe) 19 clusters. Upon heating this transforms into broadened distribution.
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