Anisotropic multi-spot DBR porous silicon chip for the detection of human immunoglobin G.

Anisotropic multi-spot DBR porous silicon chip for the detection of human immunoglobin G.

Journal of nanoscience and nanotechnology (2014-04-25)

Bomin Cho, Sungyong Um, Honglae Sohn

ABSTRACT

Asymmetric porous silicon multilayer (APSM)-based optical biosensor was developed to specify human Immunoglobin G (Ig G). APSM chip was generated by an electrochemical etching of silicon wafer using an asymmetric electrode configuration in aqueous ethanolic HF solution and constituted with nine arrayed porous silicon multilayer. APSM prepared from anisotropic etching conditions displayed a sharp reflection resonance in the reflectivity spectrum. Each spot displayed single reflection resonance at different wavelengths as a function of the lateral distance from the Pt counter electrode. The sensor system was consisted of the 3 x 3 spot array of APSM modified with protein A. The system was probed with an aqueous human Ig G. Molecular binding and specificity was monitored as a shift in wavelength of reflection resonance.

MATERIALS

Product Number

Brand

Product Description

GF46268433

Silicon, disks, 15.9mm, thickness 0.38mm, single crystal, n-type, 100%

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Silicon, rod, 100mm, diameter 12.7mm, single crystal - random orientation, 100%

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Silicon, disks, 13mm, thickness 0.38mm, single crystal, 100%

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Silicon, rod, 100mm, diameter 2.0mm, crystalline, 100%

GF16286227

Silicon, disks, 15.9mm, thickness 0.38mm, single crystal, n-type, 100%

GF04814951

Silicon, rod, 100mm, diameter 25mm, crystalline, 100%

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Silicon, rod, 100mm, diameter 10.0mm, single crystal - random orientation, 100%

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Silicon, rod, 50mm, diameter 2.0mm, crystalline, 100%

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Silicon, sheet, 14x14mm, thickness 1.0mm, single crystal, -111, 100%

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Silicon, rod, 100mm, diameter 5.0mm, crystalline, 100%

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Silicon, sheet, 52x52mm, thickness 1.0mm, polycrystalline, 99.999%

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Silicon, rod, 80mm, diameter 20mm, single crystal, -100, 99.999%

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215619

Sigma-Aldrich

Silicon, powder, −325 mesh, 99% trace metals basis

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Sigma-Aldrich

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Sigma-Aldrich

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