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Title: | Conductivity of Langmuir-Blodgett films of a disk-shaped liquid-crystalline molecule-DNA complex studied by current-sensing atomic force microscopy |
Authors: | Nayak, Alpana Suresh, K.A. |
Issue Date: | 27-Aug-2008 |
Publisher: | American Physical Society |
Citation: | Physical Review E, 2008, Vol.78, p021606 |
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. |
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) |
URI: | http://hdl.handle.net/2289/3685 |
ISSN: | E-ISSN: 1550-2376 P-ISSN: 1539-3755 |
Alternative Location: | http://dx.doi.org/10.1103/PhysRevE.78.021606 |
Copyright: | 2008 The American Physical Society |
Appears in Collections: | Research Papers (SCM) |
Files in This Item:
File | Description | Size | Format | |
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2008 PRE_V78_021606.pdf | Open Access | 831.03 kB | Adobe PDF | View/Open |
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