| Nowadays,along with the rapid development of society,the problems of energy,environment and food safety are attracting more and more attention;hence the detection biomolecule become more and more important.The carbon material is an ideal component of electrochemical sensors,because the carbon material has good chemical stability,high conductivity,easy preparation and low-cost.Meanwhile,Prussian blue(PB)has excellent properties in magnetism,electrochromism and electrocatalysis.Therefore,three composite based on PB and different carbon material is designed and applied as electrochemical sensors for hydrazine,ascorbic acid and dopamine,respectively.The detail work as follows:1.The PB and chotisan is loaded on the pretreatment carbon cloth by the electrodepostion method.The morphology of modified electrode is tested through scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR)and X-ray diffraction(XRD),and the electrochemical performance of modified electrode is measured by CV and I-T.Finally,the modified electrode is applied as a electrochemical sensor to detect ascorbic acid,and the modified electrode demonstrate high sensitivity,low detection limit and high selectivity in the detection of ascorbic acid.2.The nitrogen-doped carbon nanopolyhedras(CNP)prepared by carbonizing the Zeolitic Imidazole Framework-67(ZIF-67),are used to load the PB nanoparticles.It is the first time that CNP are found to be able to promote the synthesis of PB.Then the PB/CNP is coated by polypyrrole(PPy).In order to measure the morphology and construction of composite,the as-prepared composite was characterized by SEM,TEM,FT-IR,XRD,Ultraviolet–visible spectroscopy spectrophotometry and electrochemical methods.Finally,the modified electrode is applied to detect of hydrazine;the results demonstrate the modified electrode has high sensitivity,ultra long linear range,low detection limit,good electrochemical stability and selectivity of hydrazine.3.First,we prepare the carbon microsphere(C)by carbonizing organic microsphere.Then PB is loaded on the carbon microsphere which can catalyze the synthesis of PB.Afterward,the composite of PB/C is coated by PPy.The synthesized PB/C/PPy is characterized by SEM,TEM,FTIR and XRD methods.Finally,the modified electrode is used to detect dopamine.The results demonstrate PB/C/PPy electrode has rapid response,low detection limit and long linear range in the dopamine detection. |
