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

215619

Sigma-Aldrich

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

GF41762493

Silicon, sheet, 25x25mm, thickness 1.0mm, single crystal, -100, 100%

GF46268433

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

GF14076930

Silicon, rod, 50mm, diameter 5.0mm, crystalline, 100%

GF84708681

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

GF64686998

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

GF16286227

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

GF84840004

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

GF91515034

Silicon, rod, 50mm, diameter 3.15mm, single crystal - random orientation, 100%

GF20311254

Silicon, sheet, 25x25mm, thickness 1.0mm, polycrystalline, 99.999%

GF04814951

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

GF10907377

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

GF43555664

Silicon, rod, 25mm, diameter 3.15mm, single crystal - random orientation, 100%

GF91141792

Silicon, sheet, 10x10mm, thickness 0.5mm, single crystal, -100, 100%

GF70438518

Silicon, rod, 40mm, diameter 20mm, single crystal, -100, 99.999%

GF73529051

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

GF16363391

Silicon, rod, 10mm, diameter 2.0mm, crystalline, 100%

GF64342188

Silicon, rod, 50mm, diameter 6mm, single crystal, -111, 99.999%

GF66465276

Silicon, rod, 25mm, diameter 2.0mm, crystalline, 100%

GF28448691

Silicon, rod, 50mm, diameter 5mm, single crystal, -100, 99.999%

GF72027266

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

GF85621923

Silicon, sheet, 40x40mm, thickness 3.0mm, single crystal, p-type, 100%

GF40945754

Silicon, rod, 50mm, diameter 5mm, single crystal, -111, 99.999%

GF05482852

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

GF37993595

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

GF71817543

Silicon, sheet, 10x10mm, thickness 0.6mm, single crystal, -100, 100%

GF22929307

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

647802

Sigma-Aldrich

Silicon, wafer (single side polished), <100>, N-type, contains phosphorus as dopant, diam. × thickness 3 in. × 0.5 mm

647799

Sigma-Aldrich

Silicon, wafer (single side polished), <111>, N-type, contains phosphorus as dopant, diam. × thickness 2 in. × 0.5 mm

647543

Sigma-Aldrich

Silicon, wafer (single side polished), <111>, N-type, contains no dopant, diam. × thickness 3 in. × 0.5 mm