Dopamine polymer/noble metal nanoparticle electrochemical sensor as well as preparation method and application thereof

The invention provides a dopamine polymer/noble metal nanoparticle electrochemical sensor as well as a preparation method and application thereof. The novel bioelectrochemical sensor is a three-electrode system sensor, wherein a reference electrode is a saturated calomel electrode, a counter electrode is a platinum wire electrode, and a working electrode is a glassy-carbon electrode modified by noble metal nanoparticles. According to the invention, noble metal nanoparticles are prepared by dropping a new-made dopamine or a ramification solution thereof and a water solution of a noble metal precursor on the glassy-carbon electrode layer by layer and reacting through a self-assembly method; and a dopamine polymer generated through the reaction has adhesion capacity and can increase the firmness of the noble metal nanoparticles and the glassy-carbon electrode. The dopamine polymer/noble metal nanoparticle electrochemical sensor provided by the invention can be applied to the detection of hydrogen peroxide; and a result indicates that the dopamine polymer/noble metal nanoparticle electrochemical sensor provided by the invention has the advantages of simple and fast preparation method, high firmness, low detection limit, good reproducibility and fast response.