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Erythorbic acid promoted synthesis of CdS quantum dots in aqueous solution and study on optical properties

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1016/j.colsurfa.2014.04.049
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Affiliation
  1. National Research Council of Canada. NRC Steacie Institute for Molecular Sciences
FormatText, Article
SubjectAlkalinity; Cadmium chloride; Optical properties; Passivation; Scavenging; Semiconductor quantum dots; Water injection; Acid-promoted synthesis; Cds quantum dots(QDs); Environment friendly; Experimental parameters; Oxygen scavengers; QDs; Reactant concentrations; Water-soluble; Cadmium sulfide; 3 mercaptopropionic acid; cadmium sulfate; isoascorbic acid; quantum dot; absorption; aqueous solution; chemical structure; infrared spectrometry; nuclear magnetic resonance; room temperature; synthesis
Abstract
The effect of erythorbic acid (EA) on the aqueous formation of CdS quantum dots (QDs) at room temperature was explored in this work. Without N2 protection, CdS QDs were synthesized in water by a one-pot non-hot-injection approach at room temperature. The Cd and S sources were CdCl2 and Na2S, respectively, together with 3-mercapto-propionic acid (MPA) as the passivating ligand. The experimental results indicate that the use of the oxygen scavenger, i.e., EA, was critical for the formation of the CdS QDs with reasonably good optical properties, and it is also important to tune experimental parameters such as MPA-to-Cd molar ratios, pH, and reactant concentrations. The mechanism about the EA promoted formation of CdS QDs was discussed in terms of NMR, IR, in situ absorption, and photoemission studies. The very reason for the EA promoted formation of CdS QDs is due to its reducibility and passivation on the QD surface (particularly in alkaline environment). The present study suggests that the use of EA could be a practical means to enable the room-temperature formation of QDs in water. © 2014 Elsevier B.V.
Publication date
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  • Colloids and Surfaces A: Physicochemical and Engineering Aspects 455, no. 1 (2014): 129–135.
LanguageEnglish
Peer reviewedYes
NPARC number21272172
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Record identifier22ce0d5d-28b0-4206-98ac-310c8d6cc4da
Record created2014-07-23
Record modified2020-04-22
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