Research On Photoelectrochemical Sensors Based On Sulfide And Graphene Oxide Nanocomposites

Metal sulfides are optoelectronic materials with low electronegativity.They are widely used in catalysis,solar cells,and optoelectronic sensing due to their high electron transfer efficiency and fast response speed;As a carbon-based nanomaterial,graphene（GO）has high electron mobility and good electron transport properties.In addition,GO can also play a role in amplifying the signal,which has attracted much attention in the field of electrochemistry.Compared with detection methods such as fluorescence spectroscopy,chromatography,and electrochemistry,photoelectroch-emical（PEC）sensing has attracted much attention due to its high sensitivity,low cost,simple detection method,and fast analysis speed,and has broad development prospects.In this paper,a PEC sensor based on metal sulfide and GO is constructed,and the constructed sensor is applied in the field of drug detection.The details are as follows:The rod-shaped Bi₂S₃was synthesized by hydrothermal method.Starting from ZIF-8,Zn S was synthesized by etching and solvothermal method,TiO₂and GO were synthesized by traditional solution method,and Bi₂S₃/Zn S/TiO₂/GO nanocomposites were obtained by compounding.Based on the inhibitory effect of rutin on photocurrent,a Bi₂S₃/Zn S/TiO₂/GO/GCE PEC sensor for rutin detection was constructed.The photocurrent of the sensor decreases with the increase of rutin concentration and has a good linear relationship,with a wide linear range,namely0.01-100μM,low detection limit,LOD of 0.004μM,and recovery rate of98.59%-100.69%,The RSD was 0.43%-0.66%,indicating that the detection of real rutin samples has good feasibility.The flower-like Sn S₂and sea urchin-like Ag Bi S₂were successfully synthesized by the solvothermal method,and then combined with GO,the Sn S₂/Ag Bi S₂/GO composite material was successfully prepared,which has excellent PEC performance.which are selective for photocurrent in acetaminophen（AP）on the basis of the inhibitory effect,a PEC sensor for AP detection was successfully prepared.In the best environment,the sensor has a wide linear range:0.01-1μM and 1-50μM,and a low detection limit（LOD=0.004μM）,good anti-interference,stability and reproducibility;it can realize sensitive detection of AP real samples,which has potential development prospects.Cd-In₂S₃was successfully synthesized by solvothermal method,b-TiO₂was obtained by reducing TiO₂with Na BH₄at high temperature,and Cd-In₂S₃/b-TiO₂/GO with excellent PEC performance was obtained by combining Cd-In₂S₃,b-TiO₂and GO based on the composite material,a PEC sensor for baicalein detection was constructed based on the selective inhibition of baicalein on the photocurrent of the composite material.The Cd-In₂S₃/b-TiO₂/GO/GCE sensor has a wide linear range（1n M-10 n M,10 n M-30μM）,low detection limits（LOD（S/N=3）=0.5 n M）,good stability,reproducibility,and immunity to interference,and shows a good recovery rate in the detection of baicalein real samples,indicating that it has a broad development prospect in baicalein real samples.