Polyoxometalate-Based Layered Structures for Charge Transport Control in Molecular Devices
- 18 March 2008
- journal article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 2 (4), 733-742
- https://doi.org/10.1021/nn700333j
Abstract
Hybrid organic-inorganic films consisted of molecular layers of a Keggin-structure polyoxometalate (POM: 12-tungstophosphoric acid, H(3)PW(12)O(40)) and 1,12-diaminododecane (DD) on 3-aminopropyl triethoxysilane (APTES)-modified silicon surface, fabricated via the layer-by-layer (LBL) self-assembly method are evaluated as molecular materials for electronic devices. The effect of the fabrication process parameters, including primarily compositions of deposition solutions, on the structural characteristics of the POM-based multilayers was studied extensively with a combination of spectroscopic methods (UV, FTIR, and XPS). Well-characterized POM-based films (both single-layers and multilayers) in a controlled and reproducible way were obtained. The conduction mechanisms in single-layered and multilayered structures were elucidated by the electrical characterization of the produced films supported by the appropriate theoretical analysis. Fowler-Nordheim (FN) tunneling and percolation mechanisms were encountered in good correlation with the structural characteristics of the films encouraging further investigation on the use of these materials in electronic and, in particular, in memory devices.Keywords
This publication has 50 references indexed in Scilit:
- Polyoxometalate clusters, nanostructures and materials: From self assembly to designer materials and devicesChemical Society Reviews, 2006
- Monolayer to Multilayer Nanostructural Growth Transition in N-Type Oligothiophenes on Au(111) and Implications for Organic Field-Effect Transistor PerformanceNano Letters, 2006
- Photoelectron Spectroscopy of Free Multiply Charged Keggin Anions α-[PM12O40]3- (M = Mo, W) in the Gas PhaseThe Journal of Physical Chemistry A, 2006
- Towards molecular electronics with large-area molecular junctionsNature, 2006
- Metal-free silicon–molecule–nanotube testbed and memory deviceNature Materials, 2005
- Molecularly inherent voltage-controlled conductance switchingNature Materials, 2005
- Distance Dependence of the Electron-Transfer Rate Across Covalently Bonded Monolayers on SiliconThe Journal of Physical Chemistry B, 2001
- Electronic and Magnetic Properties of α-Keggin Anions: A DFT Study of [XM12O40]n-, (M = W, Mo; X = AlIII, SiIV, PV, FeIII, CoII, CoIII ) and [SiM11VO40]m- (M = Mo and W)Journal of the American Chemical Society, 2001
- Electron Delocalization and Magnetic State of Doubly-Reduced PolyoxometalatesJournal of the American Chemical Society, 2001
- Preparation, Structural Principles, Properties and ApplicationsPublished by Springer Science and Business Media LLC ,1983