Fluorescence properties of colloidal CdSe/ZnS quantum dots with various surface modifications

Chi Tsu Yuan, Wu-Ching Chou*, Der San Chuu, Walter H. Chang, Hong Sheng Lin, Ruoh Chyu Ruaan

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Colloidal CdSe/ZnS quantum dots (QDs) were modified by various functional ligands to study the effect of ligand modification on the fluorescence emission wavelength, efficiency, and mechanism for their application in nano-bio-photonics. The fluorescence spectra were investigated by the time-integrated and time-resolved as well as spatial-resolved micro-fluorescence measurements. Fluorescence spectra and decay profiles were significantly changed by the introduction of various ligands. The spatial dependent fluorescence of colloidal QDs in the ambient environment was observed. Fluorescence intensity imaging of colloidal QDs attached to Mercaptopropionic acid (MPA) ligands show a doughnut-like shape.

Original languageEnglish
Pages (from-to)131-135
Number of pages5
JournalJournal of Medical and Biological Engineering
Volume26
Issue number3
StatePublished - 1 Sep 2006

Keywords

  • Fluorescence image
  • Quantum dots
  • Surface modifications
  • Time-integrated fluorescence spectra
  • Time-resolved fluorescence spectra

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