Synthesise Of Porphyrin And Zinc, Coper Tetraphenylporphyrin And Their Optical Waveguide Sensing Properties

With the development of industry and construction,the number of flammable,explosive,poisonous and harmful gases are increasing.Due to the advantages of low cost,easy processing, simple modification of physical and chemical properties chemical sensor has been widely used in scientific, industrial and military fields.Sensitive material as the core of the sensor, will directly affect the selectivity and sensitivity of the sensor.Porphyrins and metalloporphyrins as sensitive material of the sensor,after in contact with the VOCs,through the absorption spectrum`s of the maximum peak split, displacement, and band widening or narrowing of the band it will show corresponding response signal.Therefore, optical waveguide sensor(OWG) has many features,such as,relatively low cost,fast response,and could online detection, these features made it have wide application prospect in the field of biochemical and environmental testing.The optical waveguide(OWG) sensor has attracted considerable attention for monitoring environmental pollution, industrial processes, and biological fields, particularly, for the detection of gaseous elements in trace concentrations.OWG methods for sensing have several merits over other types of sensors, such as,the potentials for high sensitivity, fast response time and intrinsically safe detection. Furthermore, they suffer little or no interence in the waveguide element of the sensor and can be made at a very low cost. OWG sensor technology will play an important role in gas detection applications.The article began by describing the sensitive materials,such as,semiconductor materials,polymer materials,nano materials and intelligent materials object detection and detection method of the application of in various sensors,we also introduced the importance of optical waveguide chemical sensors in the analysis of the field and its working principle and characteristics.The porphyrin and metalloporphyrin complexes as sensitive material for optical waveguide sensor, Taking advantage of the characteristics of optical waveguide sensor to detect volatile organic compounds.Studies are as follows:1.Porphyrins and metalloporphyrins complexes have excellent gas sensing properties, at present, porphyrins and metalloporphyrins complexes sensors have been applied to detected the VOCs, both in China and abroad.In this paper,porphyrins and its structure, synthesis method, synthesis of porphyrins and metalloporphyrins complexes and the influencing factors has been introduced.In the second chapter, introduced the porphyrin and metalloporphyrin complex structure characteristics,synthetic method and application in various sensors.Four phenylporphyrin and four phenylporphyrin zinc, copper complexes were synthesized by the method of Alder,through column chromatography purification; characterized and discussed its structure characteristics by UV spectroscopy, infrared-spectroscopy.2.By Alder method zinc tetraphenylporphyrin complex was synthesized and its structure was characterized.Zinc tetraphenylporphyrin film was deposited onto the surface of single mode potassium ion(K+)exchanged glass optical waveguide(OWG) by spin coater.The OWG sensor was fixed on the gas sensor system to detect volatile organic compound gases.This sensor can respond towards low concentration of styrene,xylene,and toluene gases at room temperature,among them styrene gas has the best response.The sensor has high sensitivity,fast response,recovery speed,and good reversibility.3.In order to further discuss the metalloporphyrin molecule`s center metal to the detection of steam response, copper porphyrin complexes as a sensitive reagent,developed to K+-exchanged glass optical waveguide surface,than it detected to the different volatile organic gas.Compared with the primary experiment,sensitivity of the cooper tetraphenylporphyrin complex thin film basically no changed.When the gas concentration is 1×10-3(V/V0),it has smaller the response to methanol, ethanol and formaldehyde.4.Based on screening of four phenylporphyrin as the sensitive reagent,the sensitive performance to VOC was detected and the sensing principle was studied.The result manifests that,compared with the porphyrin molecule thin films,metal tetraphenylporphyrin complex thin film has considerable selectivity to xylene gas,further more,metal porphyrin complexes could detecte lower concentrations organic compound gases than porphyrin.The metal tetraphenylporphyrin complex thin film has fast response and recovery time,high reproducibility quality;more importantly,it has potent practical value.