Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 13, Pages 4310-4313Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b00936
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Funding
- NSF [CHE-1506014, DGE-1256082]
- NIH [F32GM110876]
- State of Washington through Clean Energy Institute - Washington Research Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1506014] Funding Source: National Science Foundation
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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.
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