Preparation And Applications Of Soliquid-Gelatum Molecularly Imprinted Polymers And Metallic Nanomaterials In The Construction Of Sensors

Sensors are small devices that incorporate a recognition element with a signal transducer. Such devices can be used for direct measurement of the analyte in the sample matrix. The sensor technology is a discipline high-tech which intersects the achievements of biology, chemistry, physics, medicine, electronics and other disciplines. It has found a vast range of important applications in the fields of medical diagnostics, food safety, drug discovery, chemical industry, genomics and proteomics, environmental, and agricultural analyses because of its good selectivity, high sensitivity, fast analysis, inexpensive, online continuous monitoring in a complex system.Signal transducers is the critical component of the sensors, it can convert the physical and chemical changes that occured on the surface of the sensitive element into measurable signals. In the piezoelectric sensor, piezoelectric quartz crystal is used for the signal transducers. Electrochemical sensors, in which an electrode is used as the transduction element, represent an important subclass of chemical sensors. In this study, we choose piezoelectric quartz crystal and inert metal electrode as signal transducer, sol-gel molecularly imprinted polymers, the dendritic silver nanostructure, silver nanowires and multi-wall carbon nanotube-Pt nanoparticles were prepared respectively in order to modify the surface of the signal transducers.The contents of this paper mainly include four parts, as shown in the following:1. The research status and development tendency of sol-gel MIP technology, piezoelectric sensor, metallic nono-materials were reviewed and the significance of this paper were discussed in the introduction.2. In the second chapter, the sol-gel MIPs were in-situ polymerization on the surface of the QCM chip, online detection of atrazine were realized by the QCM sensor. The response was proportional to the atrazine concentration in the range from0.5to10×10-8mol L-1, the linear regression equation is y=-4.22x-7.10(R2=0.9849), and the sensitivity was-4.22Hz mol-1L. In addition, the lower detection limit was3.6 ×10-9mol L-1at the signal-to-noise ratio of3. Provides a sensitive and reliable method for the detection of atrazine.3. In the third and fourth chapters, We prepared two kinds of silver nano-materials which shows excellent electrocatalytic activity in the detection of hydrogen peroxide.4. We prepared multi-wall carbon nanotube-platinum nanoparticles nanocomposite at the last two chapters, the method is easy to perform and the nanocomposite has excellent electrocatalytic activity in the detection of hydrogen peroxide and ethanol.