An amperometric cholesterol biosensor with excellent sensitivity and limit of detection based on an enzyme-immobilized microtubular ZnO@ZnS heterostructure

摘要: The controlled synthesis of porous nanostructure materials and their use as active for cholesterol sensing are key importance in current research due to exceptionally high surface area, optical electrical properties, good electron transport characteristics. In the present study we have synthesized a microtubular ZnO@ZnS heterostructure from corresponding ZnO microtubes by simple aqueous chemical sulphidation process. ZnS also been removal using acetic acid. Both area (56 68 m2 g−1, respectively) modified electronic structure. A heterostructure-modified electrode has excellent amperometric cholesterol-sensing performance, with sensitivity 52.67 mA M−1 cm−2, signal noise (S/N) ratio = 15, limit detection (LOD) 0.02 mM S/N 3. performance heterostructure, including both LOD, is superior that reported either ZnO-based or Au- Pt-modified sensors. Its originates its microstructure-based structure, which facilitate electrode.