Efficient electron transfer in functional assemblies of pyridine-modified NQDs on SWNTs

Sohee Jeong, Hyung Cheoul Shim, Soohyun Kim, Chang Soo Han

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Nanocrystal quantum dot (NQD)/single-walled carbon nanotube (SWNT) hybrid nanomaterials were synthesized, assembled into field effect transistors (FETs) via dielectrophoresis (DEP), and characterized optically and electronically. The pyridine moiety functioned as a short, noncovalent linker between the NQDs and SWNTs and allowed more efficient carrier transfer through the assemblies without deleteriously altering electronic structures. Photoluminescence studies of the resulting assemblies support an efficient carrier transfer process in CdSe-py-SWNTs unlike that of CdSe/ZnS-py-SWNTs. The use of DEP as a means of controlling the assembly process allowed the creation of a SWNT array containing densely packed CdSe NQDs across a 2-mgap between electrodes. Observations and characterization of the photocurrent, resistivity, gate dependence, and optical properties of these systems suggest efficient electron transfer from photoexcited NQDs to SWNTs.

Original languageEnglish
Pages (from-to)324-330
Number of pages7
JournalACS nano
Volume4
Issue number1
DOIs
Publication statusPublished - 2010 Jan 26

Keywords

  • 0D-1D hybrid
  • Carrier transfer
  • CdSe nanocrystal quantum dot
  • Noncovalent adsorption
  • Photocurrent
  • Photoluminescence
  • Single-walled carbon nanotube

ASJC Scopus subject areas

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

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