Critical Assessment of Wet-chemical Oxidation Synthesis of Silicon Quantum Dots

Jonathan Lammert-Jan Wilbrink, Chia-Ching Huang, Katerina Dohnalová, J.M.J. Paulusse

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Wet-chemical synthetic procedures are powerful strategies to afford fluorescent silicon quantum dots (Si QDs) in a versatile and scalable manner. However, development of Si QDs is still hampered by a lack of control over photoluminescence emission, in addition to synthesis and characterization complexities. The wet-chemical Si QD synthesis by oxidation of magnesium silicide (Mg2Si) with bromine (Br2) was revisited and a control reaction was carried out where the silicon source was omitted. Both reaction conditions result in substantial quantities of fluorescent material. Moreover, a comparative analysis of their optical properties (UV/fluorescence) revealed no apparent differences. Other characterization techniques also confirm the resemblance of the two materials as 1H NMR, FTIR and XPS spectra were nearly identical for both samples. Elemental analysis revealed the presence of only 2 wt% silicon in the Si QD sample. No evidence was found for the formation of significant amounts of Si QDs via this wet-chemical procedure.
Original languageEnglish
Pages (from-to)1-20
Number of pages20
JournalFaraday Discussions
Early online date1 Nov 2019
Publication statusE-pub ahead of print/First online - 1 Nov 2019


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