Research On Electrochemical Sensors With Metal Nanoparticles Modification And Visible Light Irradiation

Caffeic acid is a common cinnamic acid in daily life,which plays an extremely important role in the field of life science and medicine.However,it is also a substance with carcinogenic risk that it is necessary to develop an effective method to detect it and quantitate it.Uric acid is one of the metabolites.The level of uric acid is related to a variety of diseases.The monitoring of uric acid level has important clinical value and is significant for the prevention of related diseases.Therefore,our work had focused on the detection of these two substances.Metal nanoparticles primely meet the basic requirement as a catalyst due to their small size and specific surface area.The state of chemical bond and electrons on the surface are different from internal ones and the coordination defects of surface atoms lead to the increase of surface activity.On the other hand,when the frequency of incident photon resonate with the collective oscillation of metal free electrons,it will arouse the localized surface plasmon resonance(LSPR)effect of noble metal nanoparticles.In our work,we concentrated not only on exploring the catalytic effect of metal nanoparticles on electrochemical sensors,but also on investigating the role of visible light irradiation in electrochemical detection.To be specific,the glassy carbon electrodes modified with trifurcate PtCu nanoparticles and waxberry-like PtAuRu nanoparticles were prepared.Both of them had good catalytic effects on the detection of caffeic acid,and the visible light irradiation enhanced the sensitive of the latter.In addition,the spherical gold nanoparticles were uniformly modified on the surface of the glassy carbon electrode by means of electrochemical deposition.The result of electrical analysis under visible light irradiation is superior to that without light irradiation.The introduction of visible light to enhance the detection effect of noble metal nanomaterials modified electrode might provide a new feasible idea for the development of electrochemical sensors.