Aqueous-phase synthesis of ultra-stable small CdSe nanoparticles

Park Su Yeon, Andriy Dmytruk, Igor Dmitruk, Noda Yasuto, Atsuo Kasuya, Motohiro Takeda, Noriaki Ohuchi

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Very stable and small CdSe nanoparticles (NPs) were synthesized from the aqueous solutions containing L-cysteine (Cys) at room temperature. The Cys-capped CdSe NPs showed a very sharp excitonic peak at 420 nm. Its very small full width at half maximum (18 nm) indicates very high quality of the CdSe NPs. Their absorption features experienced little change over a month, implying an excellent stability of the CdSe NPs. The synthesis conditions were very critical to the optical property and stability of the CdSe NPs: only those prepared at specific conditions (n Se-precursor/n Cd-precursor= 0.25-0.5, n Cys/n Cd-precursor= ∼9, pH = ∼12) showed very sharp absorption peaks and maintained an excellent stability against time. Under these conditions, the peaks always appear at nearly the same wavelength, indicating that these NPs are selectively stable and grow at a particular size and structure.

Original languageEnglish
Pages (from-to)3750-3753
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume7
Issue number11
DOIs
Publication statusPublished - 2007 Nov

Keywords

  • Aqueous
  • CdSe
  • Cysteine
  • Nanoparticle
  • Synthesis

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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