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5 November 2002 Synthesis and characterization of colloidal mercury chalcogenide quantum dots
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Abstract
We describe the synthesis of colloidal mercury chalcogenide quantum dots (QDs) using a combination of strong Hg(II) coordinating ligands and precursor phase separation. This synthetic strategy provides a means of controlling the growth kinetics of mercury based II-VI QDs and addresses some of the problems which have heretofore made the synthesis of such compounds difficult. In particular, the simultaneous use of mercury coordinating ligands and precursor phase separation overcomes both the rapid precipitation of bulk mercury chalcogenides that occurs when only weak ligands are used and the reduction of Hg(II) when a strong ligand/high temperature combination is pursued. In the case of both HgS and HgSe this scheme has yielded one of the first examples of mercury chalcogenide QDs to date. The linear absorption/emission of HgS is size-dependent and ranges from 500 nm to 800 nm with corresponding sizes between 1 to 5 nm in diameter. For HgSe the band edge absorption/emission are also size dependent, ranging from 600 to 900 nm. The zincblende phase of both HgS and HgSe QDs is determined from wide angle x-ray diffraction experiments and reveals potentially large (band edge) spectral tunabilities for either material given their zero or slightly negative (bulk) band gaps.
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Masaru K. Kuno, Keith A. Higginson, John E. Bonevich, Syen B. Qadri, M. Yousuf, and Hedi M. Mattoussi "Synthesis and characterization of colloidal mercury chalcogenide quantum dots", Proc. SPIE 4808, Optical Properties of Nanocrystals, (5 November 2002); https://doi.org/10.1117/12.452245
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