All-(111) surface silicon nanowires: selective functionalization for biosensing applications


Masood, M.N. and Chen, S. and Carlen, E.T. and Berg, A. van den (2010) All-(111) surface silicon nanowires: selective functionalization for biosensing applications. ACS applied materials & interfaces, 2 (12). pp. 3422-3428. ISSN 1944-8244

[img] PDF
Restricted to UT campus only
: Request a copy
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
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:
Official URL:
Export this item as:BibTeX
HTML Citation
Reference Manager


Repository Staff Only: item control page

Metis ID: 277511