Nanometer multilayer composite films of lead phthalocyanine(PbPc) and vanadyl phthalocyanine(VOPc) were prepared by vacuum vapor deposition. It is found that a new absorption peak around 940 nm appeared as discovered ...Nanometer multilayer composite films of lead phthalocyanine(PbPc) and vanadyl phthalocyanine(VOPc) were prepared by vacuum vapor deposition. It is found that a new absorption peak around 940 nm appeared as discovered by UV-visible absorption analysis. Compared to the Q bands absorption of single component films of VOPc and PbPc, the new peak is red-shifted. It is also found that the new peak shows a small red-shift when the thickness of the PbPc layer increases. It is concluded that the new peak is a result of composition, and the red-shift is caused by both interface effect and quantum confinement effect of the nanometer multilayered structure.展开更多
Pressure-related sensing materials in mechanochromic luminescent materials have received wide attention.However,at present,most piezochromic luminescence(PCL)materials have problems such as aggregation-caused quenchin...Pressure-related sensing materials in mechanochromic luminescent materials have received wide attention.However,at present,most piezochromic luminescence(PCL)materials have problems such as aggregation-caused quenching(ACQ)effect due to the presence of powder form,complicated preparation methods and fluorescence quenching effect under high pressure.To solve these problems,we employ three components containing carbon dots(CDs),layered double hydroxides(LDHs)and polyvinyl alcohol(PVA)to construct the CDs-LDHs/PVA film.The LDHs can provide a rigid environment for CDs and improve the luminescent efficiency of CDs.The film shows high sensitivity,stability and reversibility.Moreover,the compressed film can recover to its original state by heating.Therefore,the PCL film with dual emission(fluorescence and phosphorescence)characteristic is constructed,which boosts the sensitivity of pressure-sensing.展开更多
By dip-coating poly（3,4-ethylenedioxythiophene）/poly（styrenesulfonate）,an organic semiconductor,on slide glass and then calcining at a low temperature of 100 ℃,the organic-inorganic composite TiO2-PEDT/PSS film w...By dip-coating poly（3,4-ethylenedioxythiophene）/poly（styrenesulfonate）,an organic semiconductor,on slide glass and then calcining at a low temperature of 100 ℃,the organic-inorganic composite TiO2-PEDT/PSS film was prepared.In the TiO2-PEDT/PSS dual-layer structure,photo-generated electrons in the TiO2 layer inject into the PEDT/PSS layer under UV illumination,and the recombination of photo-generated electrons and holes in the TiO2 layer is suppressed consequently,so the photocatalytic activity of this composite film is increased significantly compared with TiO2 film.展开更多
文摘Nanometer multilayer composite films of lead phthalocyanine(PbPc) and vanadyl phthalocyanine(VOPc) were prepared by vacuum vapor deposition. It is found that a new absorption peak around 940 nm appeared as discovered by UV-visible absorption analysis. Compared to the Q bands absorption of single component films of VOPc and PbPc, the new peak is red-shifted. It is also found that the new peak shows a small red-shift when the thickness of the PbPc layer increases. It is concluded that the new peak is a result of composition, and the red-shift is caused by both interface effect and quantum confinement effect of the nanometer multilayered structure.
基金supported by the National Key R&D Program of China(No.2019YFC1906100)the National Natural Science Foundation of China(Nos.21571014 and 21521005)+2 种基金the Beijing Municipal Natural Science Foundation(No.2172044)the Open Research Fund Program of Key Laboratory of Cosmetic,China National Light Industry,Beijing Technology and Business University(No.KLC-2019-ZD1)the Fundamental Research Funds for the Central Universities(No.12060093063)。
文摘Pressure-related sensing materials in mechanochromic luminescent materials have received wide attention.However,at present,most piezochromic luminescence(PCL)materials have problems such as aggregation-caused quenching(ACQ)effect due to the presence of powder form,complicated preparation methods and fluorescence quenching effect under high pressure.To solve these problems,we employ three components containing carbon dots(CDs),layered double hydroxides(LDHs)and polyvinyl alcohol(PVA)to construct the CDs-LDHs/PVA film.The LDHs can provide a rigid environment for CDs and improve the luminescent efficiency of CDs.The film shows high sensitivity,stability and reversibility.Moreover,the compressed film can recover to its original state by heating.Therefore,the PCL film with dual emission(fluorescence and phosphorescence)characteristic is constructed,which boosts the sensitivity of pressure-sensing.
文摘By dip-coating poly（3,4-ethylenedioxythiophene）/poly（styrenesulfonate）,an organic semiconductor,on slide glass and then calcining at a low temperature of 100 ℃,the organic-inorganic composite TiO2-PEDT/PSS film was prepared.In the TiO2-PEDT/PSS dual-layer structure,photo-generated electrons in the TiO2 layer inject into the PEDT/PSS layer under UV illumination,and the recombination of photo-generated electrons and holes in the TiO2 layer is suppressed consequently,so the photocatalytic activity of this composite film is increased significantly compared with TiO2 film.
