Noninjection gram-scale synthesis of monodisperse pyramidal CuInS 2 nanocrystals and their size-dependent properties

Haizheng Zhong, Shun S. Lo, Tihana Mirkovic, Yunchao Li, Yuqin Ding, Yongfang Li, Gregory D. Scholes

Research output: Contribution to journalArticle

322 Scopus citations

Abstract

CuInS2 nanocrystals are viewed as very good candidates for solar harvesting and light emitting applications. Here we report an optimized noninjection method for the synthesis of monodisperse pyramidal CuInS 2 nanocrystals with sizes ranging from 3 to 8 nm. This synthetic route is able to yield large amounts of high quality nanoparticles, usually in the gram scale for one batch experiment. The structure and surface studies showed that the resulting nanocrystals are pyramids of CuInS2 tetragonal phase with well-defined facets, while their surface is functionalized with dodecanethiol capping ligands. Spectroscopic and electrochemical measurements revealed size-dependent optical and electrical properties of CuInS2 nanocrystals, demonstrating quantum confinement effects in these systems. The size-dependent optical bandgaps of CuInS2 nanocrystals were found to be consistent with the finite-depth well effective mass approximation (EMA) calculations, which provide a convenient method to estimate the diameter of CuInS2 pyramids. Additionally we have also determined some important physical parameters, including bandgaps and energy levels, for this system, which are crucial for the integration of CuInS 2 nanocrystals in potential device applications.

Original languageEnglish (US)
Pages (from-to)5253-5262
Number of pages10
JournalACS Nano
Volume4
Issue number9
DOIs
StatePublished - Sep 28 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Keywords

  • CuInS nanocrystals
  • cyclic voltammetry
  • energy levels
  • light emitters
  • noninjection method
  • quantum confinement effects
  • solar harvesters

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