Preparation Of Graphene-like Two-dimensional Sheet Metal Oxide Nanomaterials And Their Application In Electrochemistry

Electrochemical detection method is a convenient,fast,and does not require special equipment analysis method,in various fields has been widely concerned applied and developed in recent years,.The preparation of photoactive materials with excellent photoelectric properties is the research basis and basis for the construction of electrochemical sensors.Generally,the composite of nanomaterials with some metal materials,semiconductor materials and nanomaterials can obtain more excellent properties and break through the limitations of single materials in application.This paper combines the WO₃,Bi₂O₃,fluorescent carbon?CDs?and gold nanoparticles materials of their respective advantages,respectively,the preparation of the WO₃/CDs,Bi₂O₃/CDs and TiO₂/Au/three performance functional nanocomposites,as the PEC sensor platform,and build the antibiotic sensor,through continuous experiment made some beneficial results,main contents is as follows:1.WO₃/CDs nanocomposites were prepared by ultrasonic method.Comparative experiments show that the addition of fluorescence carbon quantum can effectively improve the radius and dispersion of WO₃,broaden the effective range of WO₃absorption wavelength,promote the separation of photogenerated electrons and holes,and improve the rate of charge transfer.And based on the carbon quantum and antibiotic between the pion-pi conjugate action can be effectively combined in the catalytic interface,thus achieving the enrichment effect of the characteristics.The photoelectric chemical sensor of WO₃/CDs nanocomposite was constructed based on its high performance.Studies have shown that the electrochemical sensor has a good response to and detection effect of tetracycline in antibiotics.In addition,by comparing a series of factors such as different enrichment time,different buffer solution and different pH value,the optimal experimental conditions are obtained to complete the final detection of a series of tetracycline concentrations.Subsequent experiments proved that the sensor has high stability and good selectivity,which can be used for sensitive and rapid detection of tetracycline.There was a linear relationship between the concentration of tetracycline and the PEC response within the range of0.2³.6umol?linear correlation R²=0.9941?.2.Bi₂O₃/CDs nanocomposites were prepared by microwave ultrasonic synthesis using fluorescent carbon dots?CDs?prepared by electrolysis as raw materials.The successful recombination of CDs and Bi₂O₃ was confirmed by transmission electron microscope?TEM?,scanning electron microscope?SEM?,spectrograph and electrochemical detection.Due to the interaction between Bi₂O₃ and fluorescent carbon point nanomaterials,it is compared with single Bi₂O₃ or CDs materials.Experiment found that the fluorescence of quantum dots doped carbon can effectively improve the efficiency of light gave birth to the separation of electrons and holes,the composite has more excellent electrical conduction ability,improve the electrochemical performance of Bi₂O₃,under the condition of illumination,further coupling adapter body,constructed the Bi₂O₃/CDs nanocomposite photoelectrochemical sensor interface used in the detection of oxytetracycline in nature.A series of concentrations of oxytetracycline were tested in the experiment,and the results showed that the electrochemical oxytetracycline sensor based on Bi₂O₃/CDs nanocomposite material had higher stability,sensitivity and better anti-interference ability.The detection range of oxytetracycline was 2.5-20?mol,and it could be used for the detection of oxytetracycline in actual samples.3.TiO₂/Au/?-CD nanocomposites were prepared by cyclic voltammetry and their electrochemical properties were investigated.It was found that the introduction of metallic gold particles with the characteristics of surface plasmon resonance could significantly inhibit the recombination of photogenerated electrons and holes,improve the rate of charge transfer and enhance the absorption of visible light.The interface composition was further optimized to construct the photoelectric chemical sensor of TiO₂/Au/?-CD nanocomposite material.Under the irradiation of visible light,based on the principle of photoelectric electron hole oxidation of MP,an ultra-sensitive photoelectric biosensor platform was constructed for the detection of environmental MP pollutants.After a series of optimization,the sensor platform constructed by the sensor realizes sensitive electrochemical sensing detection of the target,and the sensor has good stability.Its advantages are simple preparation process,environmental protection,fast analysis time,good reproducibility,high selectivity,better than the traditional analysis method.