A highly sensitive electrochemical platform based on the bimetallic Pd@Au nanowires network for organophosphorus pesticides detection

Various of nanomaterials have been applied for the construction of acetylcholinesterase biosensors to detect pesticides. In this work, a kind of network structure composed of bimetallic Pd@Au nanowires with high aspect ratio has been developed. The nanowires network structure not only provided multiple electron pathways, thus a better electrical conductivity, but also possessed enlarged electroactive surface area for the immobilization of enzyme which were due to the self-interconnecting nanowires. Moreover, the stability of the enzyme electrode was also improved. Combined with the intrinsic good electrical conductivity and electrocatalytic activity of the Pd@Au nanomaterials, the Pd@Au nanowires network electrode could be a promising platform for the electrochemical biosensing application. As a result, the developed biosensor based on Pd@Au nanowires network could detect malathion in the range of 0.1 pM to 100 nM with a detection limit of 0.037 pM, meanwhile, excellent reproducibility, high selectivity as well as good stability were also obtained. Besides, the biosensor could achieve a high accuracy in real samples analysis.