Preparation, Characterization And Application Of Prussian Blue Composite Nanomaterials

Prussian blue (PB) is known for its excellent electrochemical, photophysical, magnetic, electrochromic properties due to its special structure. Therefore, it has extensive applications in many fields, such as electroanalytical chemistry, electrocatalysis, sensors, electrochromism, photoresponse and batteries. The study of the electrocatalytic properties and detection performance of PB-modified electrode has made some progress in recent years. However, PB-modified electrodes still face some disadvantages especially with regards to its wastage during the determination process and its long-term stability. Meanwhile, nanotechnology is booming these years because of the nontraditional characterization of nanomaterials. Therefore, it has become essential and challenging for combining PB with other nanomaterials to improve the performance of PB.This thesis comprises four parts, as follows:1. The structure, character and application of PB were summarized. The application in the field of chemically modified electrode was described in detail. And the property and function of a variety of nanomaterials was introduced. In the end, the research objectives and research mentality of this thesis were also represented.2. A block polymer which has a novel configuration was recommended, its full name is poly(ethylene glycol)-b-poly(propyleneglycol)-b-poly(ethylene glycol) terminated with pentacyano(4-(dimethylamino)pyridine)ferrate (EPE-Fe). It could be used as a precursor of PB which has a series of morphology. The EPE-Fe exhibited favorable electrochemical quality during the electrochemical analysis. And a point of inflection which could possibly be the critical micelle concentration (CMC) or the critical point of a self-assembled framework was calculated through quantitative analysis. All of the information obtained could be crucial to fabricate PB composite nanomaterials.3. PB nanoshells were successfully incorporated into supported phospholipids layers on GC electrode. The obtained PB/lipid bilayer/GC electrode inhibited the inherent electrochemical properties of PB. It also exhibited electrocatalytical activity toward H2O2 and L-cysteine. The obtained PB/lipid bilayer/GC electrode could be used to develop various oxidase-based biosensors since lipid bilayer could also give a biological benign environment to enzyme molecules.4. We have developed a simple strategy for the formation of a closely packed and stable monolayer of PBPPy nanocomposites on the surface of aqueous solution which could be transferred onto the electrode surface to fabricate a PBPPy modified electrode by a simple LBL assembly technique. The resulted sensor showed excellent electrocatalysis toward the reduction of H2O2. It is believed that the suggested method can be extended to a wide range of nanomaterials assembly.