Preparation Of Novel Nanosensors And Research On Ambient Temperature Sensing

In recent years,as the research on sensors continues to deepen,the demand for environmental sensors has increased and their applications have become more and more extensive,so the requirements for sensor performance have become higher and higher.At present,there are many researches on large-scale environmental sensors,but few researches on nanometer-level temperature sensors.With the vigorous development of nanotechnology,nanomaterials with different shapes and properties have been continuously synthesized.Among them,the core/shell nanomaterials have attracted the most attention.The preparation method is simple,the cost is low,and the size can be flexibly controlled.The physical and chemical properties and functional characteristics of Environmentally responsive nanomaterials can quickly produce responsive behaviors to changes in external environmental conditions,and are mainly synthesized from a new type of functional polymer materials or inorganic functional materials.In this paper,the core/shell polymer microspheres are endowed with two properties of temperature sensitivity and fluorescence,and a new type of nano sensor with environmental temperature sensing performance is prepared,and the environmental temperature response and temperature sensing performance of the new type of nano sensor are explored.The new nano sensor prepared by us is used in some special occasions where it is not convenient to use a thermometer,and its temperature sensing performance is used to predict the ambient temperature.In the first phase of the work,a temperature-sensitive core/shell fluorescent polymer microsphere was mainly prepared.The polymer microspheres are mainly prepared by two-step distillation precipitation polymerization to prepare divinylbenzene mother spheres with amide groups,that is,DVB@AAm microspheres are obtained,which are used as the inner core,and the chloroauric acid is reduced in the inner core.The surface of the microspheres is loaded with gold nanoparticles as a template for the next polymerization;the surface of DVB@AAm@Au microspheres is modified,and two functional monomers,temperature-sensitive and fluorescent,are introduced through distillation precipitation polymerization to obtain a core/shell structurepolymerizationObjectmicrospheres,namely DVB@AAm@Au@NIPAAm-NVC core/shell composite microspheres.The polymer microspheres were characterized by SEM,TEM,FITR,XPS,EDAX,and thermogravimetric analysis.In the second stage of this work,a temperature-sensitive egg yolk/shell fluorescent polymer microsphere was prepared based on the first stage.First,a series of cue balls with different monomer content were prepared by distillation precipitation polymerization using vinylimidazole as the monomer as the inner core to obtain P(MBA-co-?)core microspheres;through in-situ reduction of chloroauric acid,the inner core The surface is loaded with gold nanoparticles as the template for the next reaction;with TEOS as the silicon source,a layer of silicon shell layer is formed on the surface of the core loaded with gold nanoparticles by hydrolysis under alkaline conditions,and its surface is modified as the next step.One-step sacrificial template;temperature-sensitive and fluorescent functional monomers are introduced by distillation precipitation polymerization to obtain polymer microspheres with a three-layer composite structure;temperature-sensitive egg yolk/shell fluorescent polymerization is obtained after the silicon layer is etched by hydrofluoric acid P(MBA-co-?)@Au@SiO₂-MPS@NIPAAm-NVCthree-layercomposite microspheres are obtained.The polymer microspheres were characterized by TEM,FITR,XPS,EDAX,and thermogravimetric analysis,and the environmental temperature sensing performance of the egg yolk/shell composite microspheres was explored.Prove that our ideal new nanosensor was successfully prepared.