Optimization Design of Electrochemical Biosensors Based on Gold Nanomaterials

At present, chemical biosensors still have poor reproducibility and stability due to that the density of nanomaterials particles is not ideal. Therefore, an optimal design method of electrochemical biosensor based on gold nanomaterials is proposed. Two types of sensors, namely DNA biosensor and immune biosensor, were designed in this work. A DNA biosensor with gold nanorod nanocomposite modified electrode was prepared, and its electrical activity was measured by Methylene blue. In contrast, an electrochemical immune sensor with gold nanorod-modified electrode was prepared and used for detection of alpha fetoprotein. The experimental results show that the designed DNA biosensor and electrochemical immune sensor have the advantages of simple preparation, high sensitivity, good selectivity and good stability.