Potentiometric Measurements of Semiconductor Nanocrystal Redox Potentials.
J Am Chem Soc
; 138(13): 4310-3, 2016 Apr 06.
Article
in En
| MEDLINE
| ID: mdl-26978480
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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Quantum Dots
Language:
En
Journal:
J Am Chem Soc
Year:
2016
Document type:
Article
Affiliation country:
Estados Unidos