TGS (triglycine sulfate) is a pyroelectric crystal material which has an excllent pyroelectricity.The LATGS,a kind of doped TGS crystal,in which L α alanine (LA) substitues for glycine partially and induces an intern...TGS (triglycine sulfate) is a pyroelectric crystal material which has an excllent pyroelectricity.The LATGS,a kind of doped TGS crystal,in which L α alanine (LA) substitues for glycine partially and induces an internal bias in TGS resulting in permanently poled single domain crystal,becomes the comprehensively used pyroelectric material. Based on the study which was about the locked polarization in LATGS,we select many kinds of aminoacids which have a strong polarity group and a unsymmetry atom to dope into TGS crystals.The aninoacids are LB (L asparagine),LL (L lysine),LH (L histidine) and LG (L glutamid acid).The saturated solutions for above four crystals growth are prepared by TGS doped with different aminoacids in water. Transparent crystals up to several centinetres in size have been grown by circling plate method and the reversible rotation rate of the platform with the crystal was about 90 r/min.There was a prefered growth in the b axis direction,with a growth rate of the b axis of about 1.0-1.2mm/day.The concentrations of aminoacids doped in TGS crystals were determined by a liquid chromatography,the concentrations of different aminoacids are about 10 -3 . It shows that the lattice parameters ( a,b and V )of TGS doped with aminoacids are significant longer than that of pure TGS crystal. We conclude that the pyroelectic cofficient,pyroelectric merit and the locked polarization of four TGS crystals,especially,the internal bield ( E b ) of LLTGS is larger than the LATGS,so that the LLTGS crystal is a promising pyroelectrc material for infrared detector.展开更多
The BiFeO_(3)/g-C_(3)N_(4) heterostructure,which is fabricated via a simple mixing–calcining method,benefits the significant enhancement of the pyrocatalytic performance.With the growth of g-C_(3)N_(4) content in the...The BiFeO_(3)/g-C_(3)N_(4) heterostructure,which is fabricated via a simple mixing–calcining method,benefits the significant enhancement of the pyrocatalytic performance.With the growth of g-C_(3)N_(4) content in the heterostructure pyrocatalysts from 0 to 25%,the decomposition ratio of Rhodamine B(RhB)dye after 18 cold-hot temperature fluctuation(25-65℃)cycles increases at first and then decreases,reaching a maximum value of~94.2%at 10%while that of the pure BiFeO_(3) is~67.7%.The enhanced dye decomposition may be due to the generation of the internal electric field which strengthens the separation of the positive and negative carriers and further accelerates their migrations.The intermediate products in the pyrocatalytic reaction also have been detected and confirmed,which proves the key role of the pyroelectric effect in realizing the dye decomposition using BiFeO_(3)/g-C_(3)N_(4) heterostructure catalyst.The pyroelectric BiFeO_(3)/g-C_(3)N_(4) heterostructure shows the potential application in pyrocatalytically degrading dye wastewater.展开更多
The strong pyrocatalytic dye decomposition of the BaTiO_(3)/Pr_(2)O_(3) heterojunction catalyst under cold–hot alternation conditions has been demonstrated in this work.For pure BaTiO_(3) nanofibers,~54%rhodamine B(R...The strong pyrocatalytic dye decomposition of the BaTiO_(3)/Pr_(2)O_(3) heterojunction catalyst under cold–hot alternation conditions has been demonstrated in this work.For pure BaTiO_(3) nanofibers,~54%rhodamine B(RhB)dye is decomposed under the cold–hot alternation of 29–57℃.With the loading content of Pr_(2)O_(3) increases from 0 to 4 wt%,the pyrocatalytic decomposition ratio of RhB solution increases first and then decreases,eventually achieving a maximum of 91%at 3 wt%.The enhanced pyrocatalytic performance after loading Pr_(2)O_(3) can be attributed to an internal electric field of the heterojunction,which effectively separates positive and negative charges.The strongly pyrocatalytic performance of BaTiO_(3)/Pr_(2)O_(3) makes it hopeful for applications in the dye wastewater treatment through harvesting the environmental cold–hot temperature alternation thermal energy in future.展开更多
文摘TGS (triglycine sulfate) is a pyroelectric crystal material which has an excllent pyroelectricity.The LATGS,a kind of doped TGS crystal,in which L α alanine (LA) substitues for glycine partially and induces an internal bias in TGS resulting in permanently poled single domain crystal,becomes the comprehensively used pyroelectric material. Based on the study which was about the locked polarization in LATGS,we select many kinds of aminoacids which have a strong polarity group and a unsymmetry atom to dope into TGS crystals.The aninoacids are LB (L asparagine),LL (L lysine),LH (L histidine) and LG (L glutamid acid).The saturated solutions for above four crystals growth are prepared by TGS doped with different aminoacids in water. Transparent crystals up to several centinetres in size have been grown by circling plate method and the reversible rotation rate of the platform with the crystal was about 90 r/min.There was a prefered growth in the b axis direction,with a growth rate of the b axis of about 1.0-1.2mm/day.The concentrations of aminoacids doped in TGS crystals were determined by a liquid chromatography,the concentrations of different aminoacids are about 10 -3 . It shows that the lattice parameters ( a,b and V )of TGS doped with aminoacids are significant longer than that of pure TGS crystal. We conclude that the pyroelectic cofficient,pyroelectric merit and the locked polarization of four TGS crystals,especially,the internal bield ( E b ) of LLTGS is larger than the LATGS,so that the LLTGS crystal is a promising pyroelectrc material for infrared detector.
基金supported by the National Natural Science Foundation of China(Nos.51872264 and 51778391)Shaanxi Provincial National Science Foundation of China(No.2020JM-579)+1 种基金Key Research and Development Program of Shaanxi Province,China(No.2020GXLH-Z-032)the Basic Public Welfare Research Program of Zhejiang Province,China(No.LGG18E020005)。
文摘The BiFeO_(3)/g-C_(3)N_(4) heterostructure,which is fabricated via a simple mixing–calcining method,benefits the significant enhancement of the pyrocatalytic performance.With the growth of g-C_(3)N_(4) content in the heterostructure pyrocatalysts from 0 to 25%,the decomposition ratio of Rhodamine B(RhB)dye after 18 cold-hot temperature fluctuation(25-65℃)cycles increases at first and then decreases,reaching a maximum value of~94.2%at 10%while that of the pure BiFeO_(3) is~67.7%.The enhanced dye decomposition may be due to the generation of the internal electric field which strengthens the separation of the positive and negative carriers and further accelerates their migrations.The intermediate products in the pyrocatalytic reaction also have been detected and confirmed,which proves the key role of the pyroelectric effect in realizing the dye decomposition using BiFeO_(3)/g-C_(3)N_(4) heterostructure catalyst.The pyroelectric BiFeO_(3)/g-C_(3)N_(4) heterostructure shows the potential application in pyrocatalytically degrading dye wastewater.
基金supported by the National Natural Science Foundation of China(No.22179108)Key Research and Development Projects of Shaanxi Province(Nos.2020GXLH-Z032 and 2022GY-161)+7 种基金Shaanxi Province High-level Talent Introduction Program(Youth Project)Doctoral Research Startup Fund project of Xi’an Polytechnic University(No.107020589)Open Project for Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province(No.22567627H)Scientific Research Project of Shaanxi Provincial Education Departmentthe Biological Resources Development and the Textile Wastewater Treatment Innovation Team(No.23JP055)Xi’an Key Laboratory of Textile and Chemical Additives Performance Assessment Reward and Subsidy Project(No.2021JH-201-0004)Young Talent Fund of the University Association for Science and Technology in Shaanxi(No.20210424)Research and Development Project fund of Beilin District in Xi’an(No.GX2208).
文摘The strong pyrocatalytic dye decomposition of the BaTiO_(3)/Pr_(2)O_(3) heterojunction catalyst under cold–hot alternation conditions has been demonstrated in this work.For pure BaTiO_(3) nanofibers,~54%rhodamine B(RhB)dye is decomposed under the cold–hot alternation of 29–57℃.With the loading content of Pr_(2)O_(3) increases from 0 to 4 wt%,the pyrocatalytic decomposition ratio of RhB solution increases first and then decreases,eventually achieving a maximum of 91%at 3 wt%.The enhanced pyrocatalytic performance after loading Pr_(2)O_(3) can be attributed to an internal electric field of the heterojunction,which effectively separates positive and negative charges.The strongly pyrocatalytic performance of BaTiO_(3)/Pr_(2)O_(3) makes it hopeful for applications in the dye wastewater treatment through harvesting the environmental cold–hot temperature alternation thermal energy in future.