Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals · 1999 · 11 citations · 3 references
Natural SciencesChemistryMaterials ScienceElectronic MaterialsInorganic ChemistrySensorsChemical BondingChemical SensorsGas SensorsOrganic Electronic MaterialsSensor MaterialsActivation EnergyBand Gap EnergyEnergy Band GapEnergy Gap AnalysisGas SensingGas Sensor ApplicationsGas-responsive Materials
Abstract Two kinds of amphiphilic phthalocyanines(AmPc,AmPcZn) have been deposited as smooth and well ordered LB films. Absorption spectra show that AmPc films are consistent with a stacked cofacial columnar structure while the AmPcZn films consist of aggregates with weakly interacting molecules. These two films exhibit different behavior toward NH3 gas-sensing. AmPcZn films gave strong and fast response on exposure to NH3 whereas AmPc films showed very weak response. It is proposed that coordination of NH3 by AmPcZn results in lowering the energy gap and hence the activation energy of AmpcZn that account for the larger increase in conductance of AmpcZn films compared with AmPc films. Key Words: phthalocyanineLB filmsgas-sensor
3