Nano Archive

Reversible electron-transfer reactions within a nanoscale metal oxide cage mediated by metallic substrates

Fleming, Christopher and Long, De-Liang and Mcmillan, Nicola and Johnston, Jacqueline and Bovet, Nicolas and Dhanak, Vinod R. and Gadegaard, Nikolaj and Kogerler, Paul and Cronin, Leroy and Kadodwala, Malcolm (2008) Reversible electron-transfer reactions within a nanoscale metal oxide cage mediated by metallic substrates. NATURE NANOTECHNOLOGY, 3 (4). pp. 229-233.

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Transition metal oxides exhibit a rich collection of electronic properties and have many practical applications in areas such as catalysis and ultra-high-density magnetic data storage. Therefore the development of switchable molecular transition metal oxides has potential for the engineering of single-molecule devices and nanoscale electronics. At present, the electronic properties of transition metal oxides can only be tailored through the irreversible introduction of dopant ions, modifying the electronic structure by either injecting electrons or core holes. Here we show that a molybdenum( VI) oxide `polyoxometalate' molecular nanocluster containing two embedded redox agents is activated by a metallic surface and can reversibly interconvert between two electronic states. Upon thermal activation two electrons are ejected from the active sulphite anions and delocalized over the metal oxide cluster cage, switching it from a fully oxidized state to a two-electron reduced state along with the concomitant formation of an S-S bonding interaction between the two sulphur centres inside the cluster shell.

Item Type:Article
Subjects:Physical Science > Nano objects
Material Science > Nanostructured materials
Material Science > Nanochemistry
ID Code:2348
Deposited By:Anuj Seth
Deposited On:18 Dec 2008 10:55
Last Modified:26 Mar 2009 13:57

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