Construction Of Ordered Macrocyclic Conjugate System And Low Power Consumption Gas Sensor

The macrocyclic conjugated complexes including porphyrin derivatives,perylene tetracarboxylic acid diimide(PDI)compounds,covalent organic frameworks and grahene have attracted increasing research interest in areas of molecular devices because of their unique optical and electronic properties associated with the extended networks along the axis perpendicular to the macrocycle planes.Meanwhile,based on their unique and electrical properties and chemical stability,it has many positions for substituent group to adjust their properties.In the various resch directions gas sensor and its gas sensitivity are always important point.The research work has been focused on the following respects: 1.3D synergistical r GO/Eu(TPy P)(Pc)hybrid aerogel for high-performance NO2 gas sensor with enhanced immunity to humidityThe sandwich-type(phthalocyaninato)(porphyrinato)europium double-decker complex Eu(TPy P)(Pc)[TPy P = meso-tetra(4-pyridyl)porphyrin;Pc = phthalocyanine] was in situ self-assembled on the surface of reduced graphene oxide(r GO)driven by the ?–? interaction,forming a 3D synergistical r GO/Eu(TPy P)(Pc)hybrid aerogel.The resulting aerogel not only effectively integrates the gas sensing of Eu(TPy P)(Pc)and good conductivity of r GO,but also exhibited a prominent synergy effect.Ascribed to the attractive properties,the fabricated NO2 gas sensor exhibits superior sensitivity and selectivity in the range of 0.5 to 100 ppm with an extremely low theoretical limit level of detection(80 ppb)at ambient temperature.The response and recovery time of r GO/Eu(TPy P)(Pc)hybrid aerogel based sensor to 20 ppm NO2 were 172 and 828 s,respectively.Remarkably,the hydrophobic porous structure of r GO/Eu(TPy P)(Pc)hybrid aerogel endows the prepared sensor with excellent immunity to high relative humidity,which conquered the key technical issue of real application.The present sensor,simultaneously featured with high performance,low-power consumption,and good tolerance to environmental variations,is anticipated to offer the ?on-site? and?on-line? measurement tool in real samples.2.Non-covalent interaction-driven self-assembly of perylene diimide on r GO for room-temperature sensing of triethylamine with enhanced immunity to humidityN,N-di-n-hexyl-1,6,7,12-tetrakis(3,5-difluoro-4-cyanophenoxy)-3,4:9,10-tetracarboxylic diimide(DF-PDI)is effectively self-assembled on reduced graphene oxide(r GO)driven by the non-covalent ?-? interactions.The resulting r GO/DF-PDI heterojunction not only effectively integrates the gas sensing of DF-PDI and the good conductivity of r GO but also exhibits the amplification effect of the p-n heterojunction and the high surface area of the r GO/DF-PDI film.Benefiting from this remarkable synergy,the r GO/DF-PDI based gas sensor exhibits high sensitivity and selectivity with a low limit of detection of 16 ppb towards triethylamine(TEA)at ambient temperature.Remarkably,the hydrophobic advantage of the r GO endows the prepared sensor with outstanding immunity to high humidity,which resolves the key technical issue of real application.The sensor presented here,with its high performance,low power consumption,and good tolerance to environmental variations,is anticipated to offer a solution to the emerging need for the on-line identification of TEA in real systems for the forthcoming Io T.3.In situ grown COF on 3D strutted graphene aerogel for electrochemical detection of nitric oxide released from living cellsThe COF-366-Fe/GA was prepared by in situ growth of COF-366-Fe on 3D graphene aerogel(GA),which allowed the highly electrocatalytic property caused by COF-366-Fe and the 3D porous structure induced by GA to build a unique sensing component for ultrasensitive and real-time determination of NO.Benefiting from the remarkable synergy of COF-366-Fe/GA,the prepared biosensor presents a fast and ultrasensitive response in the wide range of 0.18 to 400 ?M with a lower detection limit(30 n M)and higher sensitivity(8.8 ?A·?M-1·cm-2).Moreover,the molecular signals could be immediately captured by the fabricated device after release of the gas messenger NO secreted by human umbilical vein endothelial cells.These results imply that the proposed COF-366-Fe/GA with precisely controllable active sites and 3D porous structure solves randomly arrangement problem of active sites for the nitrogen-coordinated electrocatalyst,which would provide a promising powerful platform for real-time analysis of biomarkers in clinical diagnostics.