Research On Synthesis And Sensing Properties Of Sandwich Type Phthalocyanine Based Semiconductor Materials

In modern society,people are keen on pursuing economic benefits.Sometimes,they even break the laws of nature and destroy the environment.as a consequences,the pollution have become more and more serious.Especially in recent years,people's environmental protection consciousness are awaked,more and more people are wiling to protect the environment.they demand a portable device which can monitor the atmospheric conditions at any time,At this time,gas sensors are came into being and gas sensors also act as a very important class of members in the field of chemical sensors.The sensor have very good properties.First of all,the stability of chemical sensors is very high and pretty stable throughout the working hours.In fact,the sensitivity is another very important factord for gas sensor.The third,which is the more important parameter,is selectivity.Sensors play a decisive role in all fields,but their sensing characteristics are closely related to the materials which were used to construct the devices.It can be said that material is one of the most important factors in determining sensor sensing characteristics.Nowadays,scientific researcher especially hope that they can find a kind of low cost,simple operation,better performance materials to meet their requirements.Fortunately,phthalocyanine porphyrin molecules are perfectly to meet people's requirements.As a new type of functional materials,sandwich type phthalocyanine porphyrin complexes,with unique photoelectric properties and macrocyclic molecules as well as a strong ?-? interaction,making phthalocyanine porphyrin compounds have potential applications in various fields,especially in the field of materials When they work as sensor material,they achieve good results which prove that they's prospect is pretty bright.This paper is mainly divided into two parts1.Study on the synthesis of Eu(Pc)[T(OH)PP]and Its biosensor propertiesAccording to the synthetic route which had already be published,we synthesized a kind of phthalocyanine porphyrin mixed bilayer compound,which was transferred to the quartz substrate by QLS for UV-visible absorption,and polarization UV absorption detection.The above results showed that the molecule was face to face gather mode.X-ray diffraction gave a molecular size of 1.29 nm.The structure of the compound was transferred to Si/SiO2 substrate for electronic scanning electron microscopy.It was found that the membrane structure was a one-dimensional planar membrane structure,the surface of the film was smooth and the surface area was large.The compounds were then modified by QLS to ITO electrodes for electrochemical properties.The result indicated that it is feasible to use Eu(Pc)[T(OH)PP]as a modified material to detect DA.The sensor can detect the dopamine concentration in the range of 8-100 uM.it sensitivity was 0.05,and the minimum detection limit was 4.9 uM2.Synthesis and Sensitivity of Novel Sandwich Phthalocyanine MoleculesWe had synthesized a novel three-layer symmetric phthalocyanine europium Eu2[Pc(OPhCF3)4],for the first time and studied the energy distribution of the complexes by cyclic voltammetry.It was found that the synthesized complex is a bipolar semiconductor material.The complexes were made into aggregates by different methods:1ML 1×10-4M was rapidly injected into 5 mL of methanol,n-hexane,water for 3 h and 12 h and the morphology was followed by SEM.The above five aggregates were transferred to the substrate for UV-visible absorption spectroscopy.UV-Vis spectra and polarized absorption spectra.The spectra showed that the complexes were taken to face to face H-aggregation mode.X-ray diffraction(XRD)study showed that the above five kinds of membrane formation aggregation state is slightly different,explaining that the morphology will also be different.Using scanning electron microscopy(SEM)found that aggregates in different polarity solvents were different with each other,however in the same polarity solvent but growth with different times,the morphology were the same,although the size were different.In the n-hexane,our compound aggregates into a two-dimensional helical structure,in methanol,it is assembled into nano-rods,however,in the water,our compound formed into two-dimensional uniform nano-short rod,and the size did not change with time prolong.The gas sensing results showed that the nanorods formed in the water are more sensitive to both NH3 or NO2.Showing lower detection limits and higher sensitivity.The minimum detection of nitrogen dioxide in water was 50 ppb,and the other aggregates can detect a minimum of 125 ppb.Similarly,the detection of ammonia was also more sensitive.This is because the nanorods are more uniform and well ordered which lead to a larger surface area.When gas and the nano-short rod meet each other,the gas contact area is relatively large,adsorption of more gas,so the detection of gas is more sensitive.