Abstract
Vertically aligned silicon nanowire arrays (SiNWs) have been synthesized by electroless metal deposition process. The fabricated SiNWs have an average diameter of 75nm and 3.5–4.0μm length, as confirmed from scanning electron microscopy. A characteristic asymmetric peak broadening at 520cm−1 from Raman spectroscopy was obtained for the SiNWs as compared to the bulk silicon crystal due to phonon confinement. The as-prepared SiNWs exhibit good electron field-emission properties with turn-on field of about 8.26Vμm−1 at a current density of 4.9μAcm−2. The SiNWs was functionalized by coating with a thin gold metallic film for 60s, and then used as bio-probe for the detection of bovine serum albumin (BSA) protein molecules. From the linear sweep voltammetry analysis, the Au coated SiNWs, exhibit linear response to the BSA analyte with increase in concentration. The minimum detection limit of the protein molecule was calculated of about 1.16μM by the as-synthesized SiNWs probe.
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