Conductivity of Langmuir-Blodgett films of a disk-shaped liquid-crystalline molecule-DNA complex studied by current-sensing atomic force microscopy

Nayak, Alpana; Suresh, K.A.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3685

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DC Field	Value	Language
dc.contributor.author	Nayak, Alpana	-
dc.contributor.author	Suresh, K.A.	-
dc.date.accessioned	2008-12-18T11:01:19Z	-
dc.date.available	2008-12-18T11:01:19Z	-
dc.date.issued	2008-08-27	-
dc.identifier.citation	Physical Review E, 2008, Vol.78, p021606	en
dc.identifier.issn	E-ISSN: 1550-2376	-
dc.identifier.issn	P-ISSN: 1539-3755	-
dc.identifier.uri	http://hdl.handle.net/2289/3685	-
dc.description	Open Access. Also in Virtual Journal of Nanoscale Science & Technology (Vol.18, No.10, Sept 8, 2008) and Virtual Journal of Biological Physics Research (Vol.16, No.5, Sept 1, 2008)	en
dc.description.abstract	We have studied the electrical conductivity in monolayer films of an ionic disk-shaped liquid-crystal molecule, pyridinium tethered with hexaalkoxytriphenylene (PyTp), and its complex with DNA by current-sensing atomic force microscopy (CS-AFM). The pure PyTp and PyTp-DNA complex monolayer films were first formed at the air-water interface and then transferred onto conducting substrates by the Langmuir-Blodgett (LB) technique to study the nanoscale electron transport through these films. The conductive tip of CS-AFM, the LB film, and the metal substrate form a nanoscopic metal-LB film-metal (M-LB-M) junction. We have measured the current-voltage (I-V) characteristics for the M-LB-M junction using CS-AFM and have analyzed the data quantitatively. We find that the I-V curves fit well to the Fowler-Nordheim (FN) model, suggesting electron tunneling to be a possible mechanism for electron transport in our system. Further, analysis of the I-V curves based on the FN model yields the barrier heights of PyTp-DNA complex and pure PyTp films. Electron transport studies of films of ionic disk-shaped liquid-crystal molecules and their complex with DNA are important from the point of view of their applications in organic electronics.	en
dc.language.iso	en	en
dc.publisher	American Physical Society	en
dc.relation.uri	http://dx.doi.org/10.1103/PhysRevE.78.021606	en
dc.rights	2008 The American Physical Society	en
dc.title	Conductivity of Langmuir-Blodgett films of a disk-shaped liquid-crystalline molecule-DNA complex studied by current-sensing atomic force microscopy	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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