Electron transfer dynamics in MoS{sub 2} nanoclusters: Normal and inverted behavior

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.471128· OSTI ID:283527

Parsapour, F; Kelley, D F ^[1]; Craft, S; Wilcoxon, J P ^[2]

---

1. Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872 (United States)
2. 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

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ACCEPTORS
CONDUCTION BANDS
ELECTRON TRANSFER
EMISSION SPECTROSCOPY
MOLYBDENUM SULFIDES
PHOTOCHEMICAL REACTIONS
SIZE EFFECT
SOLID CLUSTERS
TIME RESOLUTION