Electron transfer dynamics in MoS{sub 2} nanoclusters: Normal and inverted behavior
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872 (United States)
- Sandia National Laboratories, Albuquerque, New Mexico 87108 (United States)
The photophysics and electron transfer (ET) dynamics of quantum confined MoS{sub 2} nanoclusters have been studied using static and time resolved emission spectroscopy. The MoS{sub 2} nanoclusters consist of a single S{endash}Mo{endash}S trilayer, having diameters of {approximately}2.5 or 4.5 nm. Two types of electron acceptors are adsorbed on these nanoclusters: 2,2{prime}-bipyridine (bpy) and 4,4{prime},5,5{prime}-tetramethyl-2,2{prime}-bipyridine (TMB). The ET reaction exothermicities may be varied by changing the electron acceptor or by varying the size of the MoS{sub 2} nanocluster. TMB is harder to reduce, and thus has a smaller ET driving force than bpy. The smaller nanoclusters have a higher energy conduction band, and thus have a larger ET driving force. In all cases, the ET driving force may be calculated from bulk MoS{sub 2} properties and quantum confinement theory. Both {open_quote}{open_quote}normal{close_quote}{close_quote} and {open_quote}{open_quote}inverted{close_quote}{close_quote} behaviors are observed. A reorganization energy of 0.40 eV is calculated from energy dependent ET rates. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 283527
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 13 Vol. 104; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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