| Literature DB >> 26978480 |
Gerard M Carroll1, Carl K Brozek1, Kimberly H Hartstein1, Emily Y Tsui1, Daniel R Gamelin1.
Abstract
A potentiometric method for measuring redox potentials of colloidal semiconductor nanocrystals (NCs) is described. Fermi levels of colloidal ZnO NCs are measured in situ during photodoping, allowing correlation of NC redox potentials and reduction levels. Excellent agreement is found between electrochemical and optical redox-indicator methods. Potentiometry is also reported for colloidal CdSe NCs, which show more negative conduction-band-edge potentials than in ZnO. This difference is highlighted by spontaneous electron transfer from reduced CdSe NCs to ZnO NCs in solution, with potentiometry providing a measure of the inter-NC electron-transfer driving force. Future applications of NC potentiometry are briefly discussed.Entities:
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Year: 2016 PMID： 26978480 PMCID： PMC5107322 DOI： 10.1021/jacs.6b00936
Source DB: PubMed Journal: J Am Chem Soc ISSN： 0002-7863 Impact factor: 15.419