A colorimetric immunoassay biosensor is developed employing CNTs as a label material, which allowed direct observation of the sensing result by the naked eye. Implemented for HSA, the detection limit is 3 Â 10 À5 mg ml À1 when characterized using UV-Vis. Scheme 1 Schematics diagram of the biosensor system including (a) a sensingsubstrate and (b) a CNT-label. (c) Schematic diagrams for the operation flow of HSA detection using this biosensor.
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