Preparation Of Prussian Blue Modified Electrode And Its Application In Electrochemical Sensor

In recent years,rapid development of nanotechnology has greatly promoted the material electrochemistry.With its unique crystal structure,good biocompatibility and excellent electrochemical properties,Prussian blue nanomaterial is widely used in the field of electrochemical sensor.Herein,Prussian blue（PB）and ammonium thiomolybdate were treated as precursors to prepare Fe₃S₄/MoS₂ nanocomposite and it was applied in caffeic acid（CA）electrochemical sensor.Then,the carbon-based material derived from ZIF-L was prepared to promote the synthesis of PB and the composite was employed as catechol（CC）electrochemical sensor.Finally,MoSe₂ as a kind of transition metal dichalcogenides was combined with PB and the PB/MoSe₂composite was used for electrochemical detecting dopamine（DA）.The main contents are as follows:1.Fe₃S₄/MoS₂ composite was obtained via precursors Prussian blue（PB）and ammonium thiomolybdate[（NH₄）₂MoS₄]by simple solvothermal reaction.The structure and morphology were characterized by XRD,XPS,SEM and TEM.Then,Fe₃S₄/MoS₂ was loaded on the surface of glassy carbon electrode（GCE）to form Fe₃S₄/MoS₂/GCE composite electrode and it was used for CA electrochemical sensor.The excellent electrochemical performance such as low limit of detection（LOD）,high sensitivity and wide linear range confirmed good properties of the sensor.In addition,the green tea originated from Zhejiang province of China was studied as practical sample to verify its applicability and the final results demonstrated the electrochemical sensor has nearly 100%recovery in practical application.2.A kind of new two-dimensional bimetallic zeolites imidazolate framework material was synthesized at room temperature.Then,the derivative nitrogen doped porous carbon coated Zn/Co nanoparticles（Zn/Co@NPC）was obtained from Zn/Co-ZIF-L pyrolysis reaction under high temperature.Next,Zn/Co@NPC was used to promote the formation of PB,and the process was proved by UV-Vis and XPS,respectively.SEM,TEM,XRD and FT-IR were employed to characterize the composite Prussian blue supported nitrogen doped porous carbon coated Zn/Co nanoparticles（Zn/Co@NPC-PB）.Then,Zn/Co@NPC-PB/GCE composite electrode was further prepared for CC electrochemical sensor.We have studied several factors that affect the electrochemical performance by XRD and cyclic voltammetry（CV）,such as pyrolysis temperature,metal species,pyrolysis time and PB synthesis time.It indicated that the electrochemical sensor has low LOD,wide linear range and good anti-interference ability.3.With its unique layered structure and large specific surface area,MoSe₂ has excellent electrocatalytic properties.PB/MoSe₂ composite was formed via the MoSe₂promoting process for PB and the mechanism was studied by UV-vis and XPS.Then,PB/MoSe₂ was characterized by SEM,TEM,XRD,UV-vis and FT-IR,respectively.Afterwards,the PB/MoSe₂ was loaded on the graphite felt（GF）to prepare PB/MoSe₂/GF composite electrode,which was applied in DA electrochemical sensor.The results expressed that it has low LOD,high sensitivity and wide linear range.In addition,the electrochemical detection in actual human serum and urine samples shows a great practical application.