All-(111) Surface Silicon Nanowires: Selective Functionalization for Biosensing Applications

Masood, M.N. and Chen, S. and Carlen, E.T. and Berg van den, A. (2010) All-(111) Surface Silicon Nanowires: Selective Functionalization for Biosensing Applications. ACS Applied Materials and Interfaces, 2 (12). pp. 3422-3428. ISSN 1944-8244

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Abstract:	e demonstrate the utilization of selective functionalization of carbon-silicon (C-Si) alkyl and alkenyl monolayers covalently linked to all-(111) surface silicon nanowire (Si-NW) biosensors. Terminal amine groups on the functional monolayer surfaces were used for conjugation of biotin n-hydroxysuccinimide ester. The selective functionalization is demonstrated by contact angle, x-ray photoelectron spectroscopy (XPS), and high resolution scanning electron microscopy (HRSEM) of 5-nm diameter thiolated Au nanoparticles linked with streptavidin and conjugated to the biotinylated all-(111) surface Si-NWs. Electrical measurements of monolayer passivated Si-NWs show improved device behavior and performance. Furthermore, an analytical model is presented to demonstrate the improvement in detection sensitivity of the alkyl and alkenyl passivated all-(111) Si-NW biosensors compared to conventional nanowire biosensor geometries and silicon dioxide passivation layers as well as interface design and electrical biasing guidelines for depletion-mode sensors.
Item Type:	Article
Copyright:	© 2010 American Chemical Society
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Biomedical and Environmental Sensor systems (BIOS)
Link to this item:	http://purl.utwente.nl/publications/75859
Official URL:	http://dx.doi.org/10.1021/am100922e
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