Abstract
Recently some of the metal nano composites are used in the semiconductor based electrical, electrochemical and optical bio-sensors. ZnO nano particles have drawn great interest due to its unique properties like low cost, wide range of band gap, biocompatible, easy to synthesize in different size and shapes and catalytic surface activity. The surface of the ZnO nano particles are perfect for immobilisation of bio molecules without hampering their biological activity. This property increase the sensitivity of bio-sensors. In this review we highlight the use of different ZnO nano particles in bio-sensors enhancing the efficiency of Bio-sensors.
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