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Molecular Bridging of Silicon Nanogaps

Ashwell, Geoff and Phillips, Laurie J. and Robinson, Benjamin J. and Urasinska-Wojcik, Barbara and Lambert, Colin J. and Grace, Iain M. and Bryce, Martin R. and Jitchati, Rukkiat and Tavasli, Mustafa and Cox, Timothy I. and Sage, Ian C. and Tuffin, Rachel P. and Ray, Shona (2010) Molecular Bridging of Silicon Nanogaps. ACS Nano, 4 (12). pp. 7401-7406. ISSN 1936-0851

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Abstract

The highly doped electrodes of a vertical silicon nanogap device have been bridged by a 5.85 nm long molecular wire, which was synthesized in situ by grafting 4-ethynylbenzaldehyde via C-Si links to the top and bottom electrodes and thereafter by coupling an amino-terminated fluorene unit to the aldehyde groups of the activated electrode surfaces. The number of bridging molecules is constrained by relying on surface roughness to match the 5.85 nm length with an electrode gap that is nominally 1 nm wider and may be controlled by varying the reaction time: the device current increases from <= 1 pA at 1 V following the initial grafting step to 10-100 nA at 1 V when reacted for 5-15 min with the amino-terminated linker and 10 mu A when reacted for 16-53 h. It is the first time that both ends of a molecular wire have been directly grafted to silicon electrodes, and these molecule-Induced changes are reversible. The bridges detach when the device Is rinsed with dilute add solution, which breaks the imine links of the in situ formed wire and causes the current to revert to the subpicoampere leakage value of the 4-ethynylbenzaldehyde-grafted nanogap structure.

Item Type: Article
Journal or Publication Title: ACS Nano
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 57867
Deposited By: ep_importer_pure
Deposited On: 28 Aug 2012 15:17
Refereed?: Yes
Published?: Published
Last Modified: 21 Nov 2017 18:19
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/57867

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