Optical Nonlinearity Of Thin Layers Of Black Phosphorus And Applications In Electrochemical Detection

The synthesis and application of nanomaterials is one of the important directions for the development of physical science in the new century.In order to broaden the application of thin-layered black phosphorus nanosheets(BPNSs)in the field of physical science,the optical and electrochemical properties of thin-layered black phosphorus nanosheets were investigated.The improved method was used to prepare thin-layer black phosphorus nanosheets,which improved the preparation yield and monodispersity of BPNSs,and the micro morphology and structure of BPNSs were determined by the characterization technology of nanomaterials.The nonlinear optical properties of thin-layered black phosphorus nanosheets were studied by Z scan technique.Open-aperture Z scan measurement is carried out by nanosecond pulse laser with low repetition rate(10 Hz),so as to reduce the existence and accumulation of thermal accumulation effect.BPNSs have strong saturated absorption(SA)under short wavelength excitation and reverse saturated absorption(RSA)under specific wavelength excitation.With the increase of laser energy,the RSA is more obvious,which indicates that the RSA of thin-layered black phosphorus nanosheets is not only related to the specific wavelength,but also to the energy.The electrochemical properties of BPNSs were investigated using an integrated test system.The black phosphorus nanosheet modified electrode(BPNSs/GCE)was fabricated,and the application of BPNSs/GCE in electrochemical detection was explored.When hydrogen peroxide was added into the system,the peak current of the modified electrode was three times that of the bare electrode,and the response time of the current signal was less than 1 s,so the response time was short and the reaction was sensitive.The results show that the successful modification of thin-layer black phosphorus nanosheet electrodes can promote the electron transfer rate,which is helpful for the electrochemical detection of hydrogen peroxide.