New route for preparation of luminescent mercaptoethanoate capped cadmium selenide quantum dots

Manoj E. Wankhede, Shaukatali N. Inamdar, Aparna Deshpande, Aniket R. Thete, Renu Pasricha, Sulabha K. Kulkarni, Santosh K. Haram

Research output: Contribution to journalArticle

Abstract

We report a synthesis of cadmium selenide quantum dots (Q-CdSe) by refluxing a mixture of cadmium acetate, selenium powder, sodium sulfite and 2-mercaptoethanol in N,N′-dimethyl formamide (DMF)/water solution. X-ray and electron diffractions suggest the formation of hexagonal phase of size quantized CdSe. Based on TEM analysis, the formation of nanoparticles with an average diameter of 3·5 ± 0·5 nm is in ferred. Their sols in DMF and dimethyl sulphoxide (DMSO) gave characteristic absorption peaks at 300 nm and 327 nm, which is attributed to the formation of high quality, size quantized CdSe particles. Extracted particles from the sol were readily redispersed in DMF and DMSO, which were diluted further with water without losing their optical and colloidal properties. FTIR spectroscopy suggested the formation of 2-mercaptoethanol thiolate on the particle surface, with free -OH groups available for linkage. Sols in DMSO and their solutions in water displayed an intense photoluminescence (PL).

Original languageEnglish (US)
Pages (from-to)291-296
Number of pages6
JournalBulletin of Materials Science
Volume31
Issue number3
DOIs
StatePublished - Jun 2008

Keywords

  • Semiconductor quantum dots; chalcogenides; chemical synthesis; photoluminescence

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials

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