These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Urea-type ligand-modified CdSe quantum dots as a fluorescence "turn-on" sensor for CO3(2-) anions.
    Author: Han C, Cui Z, Zou Z, Sabahaiti, Tian D, Li H.
    Journal: Photochem Photobiol Sci; 2010 Sep 24; 9(9):1269-73. PubMed ID: 20714674.
    Abstract:
    A new fluorescence "turn-on" nanosensor for carbonate determination was reported based on CdSe quantum dots (QDs) modified with thio ligands containing urea groups: N-(5-mercapto-1,3,4-thiadiazol-2-ylcarbamoyl)-2-(o-tolyloxy)acetamide (AASH-CdSe QDs). The AASH-CdSe QDs were prepared through a ligand exchange process and characterized by transmission electron microscopy (TEM), fluorescence spectroscopy, UV-vis spectroscopy and FT-IR spectroscopy. The synthesized AASH-CdSe QDs allowed a selective fluorescence "turn-on" response towards carbonate. Under optimal conditions, the relative fluorescence intensity increases linearly with carbonate concentration in the range 1 x 10(-7)-1 x 10(-4) M with a detection limit of 2.3 x 10(-8) M. A Langmuir-type binding model was highly effective in describing the carbonate concentration dependence of the luminescence intensity of the AASH-CdSe QDs. The possible mechanism was discussed.
    [Abstract] [Full Text] [Related] [New Search]