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Proceedings Paper

Biofunctionalization of Si nanowires using a solution based technique
Author(s): Elissa H. Williams; Albert V. Davydov; Vladimir P. Oleshko; Nancy J. Lin; Kristen L. Steffens; Amy K. Manocchi; Sergiy Krylyuk; Mulpuri V. Rao; John A. Schreifels
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Paper Abstract

Here we present a solution based functionalization technique for streptavidin (SA) protein conjugation to silicon nanowires (Si NWs). Si NWs, with a diameter of 110 nm to 130 nm and a length of 5 μm to 10 μm, were functionalized with 3-aminopropyltriethoxysilane (APTES) followed by biotin for the selective attachment of SA. High-resolution transmission electron microscopy (HRTEM) and atomic force microscopy (AFM) showed that the Si NWs were conformally coated with 20 nm to 30 nm thick APTES, biotin, and SA layers upon functionalization. Successful attachment of each bio/organic layer was confirmed by X-ray photoelectron spectroscopy (XPS) and fluorescence microscopy. Fluorescence microscopy also demonstrated that there was an undesirable non-specific binding of the SA protein as well as a control protein, bovine serum albumin (BSA), to the APTES-coated Si NWs. However, inhibition of BSA binding and enhancement of SA binding were achieved following the biotinylation step. The biofunctionalized Si NWs show potential as label-free biosensing platforms for the specific and selective detection of biomolecules.

Paper Details

Date Published: 19 October 2012
PDF: 8 pages
Proc. SPIE 8467, Nanoepitaxy: Materials and Devices IV, 846702 (19 October 2012); doi: 10.1117/12.970460
Show Author Affiliations
Elissa H. Williams, National Institute of Standards and Technology (United States)
George Mason Univ. (United States)
Albert V. Davydov, National Institute of Standards and Technology (United States)
Vladimir P. Oleshko, National Institute of Standards and Technology (United States)
Nancy J. Lin, National Institute of Standards and Technology (United States)
Kristen L. Steffens, National Institute of Standards and Technology (United States)
Amy K. Manocchi, U.S. Army Research Lab. (United States)
Sergiy Krylyuk, National Institute of Standards and Technology (United States)
Univ. of Maryland, College Park (United States)
Mulpuri V. Rao, George Mason Univ. (United States)
John A. Schreifels, George Mason Univ. (United States)


Published in SPIE Proceedings Vol. 8467:
Nanoepitaxy: Materials and Devices IV
Nobuhiko P. Kobayashi; A. Alec Talin; M. Saif Islam, Editor(s)

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