公开(公告)号：US20190077056A1

公开(公告)日：2019-03-14

申请号：US16188304

申请日：2018-11-13

申请人： University of Electronic Science and Technology of China

发明人： Weizhi Li ,  Yuming Wu ,  Xiaosong Du ,  Jimeng Li ,  Huiling Tai ,  Guangzhong Xie

IPC分类号： B29C41/00 ,  B29C41/46 ,  B29C41/52

摘要： A one-step solution casting method for preparing a PVDF-based pyroelectric polymer film is provided, which belongs to the technical field of functional material preparation. The method comprises steps of: treating a substrate with a hydrophilic reagent to obtain a hydrophilically-modified substrate, and then casting the organic solution of polyvinylidene fluoride (PVDF) or its copolymer on the hydrophilically-modified substrate. After cured, the as-casted PVDF-based film shows pyroelectricity without undergoing any stretching or poling post-treatment, indicates that the dipoles of the one-step prepared film are aligned. The self-polarization of the prepared film is attributed to a hydrogen bond induced layer-by-layer electrostatic self-assembly growth mechanism. The method is simple, low cost, high efficient, high capability to produce thick and large-area film with smooth morphology and ease to be scalized.

公开(公告)号：US11750116B2

公开(公告)日：2023-09-05

申请号：US17153833

申请日：2021-01-20

申请人： University of Electronic Science and Technology of China

发明人： Yuanjie Su ,  Qichen Gong ,  Guangzhong Xie ,  Mingliang Yao ,  Chunxu Chen ,  Jinyang Yi ,  Li Jia ,  Weizhi Li ,  Huiling Tai ,  Xiaosong Du ,  Yadong Jiang

IPC分类号： H02N1/04 ,  F01N11/00 ,  H10N30/05

CPC分类号： H02N1/04 ,  F01N11/00 ,  H10N30/05 ,  F01N2560/026

摘要： A self-powered automobile exhaust gas sensor including a supporting frame, a ferroelectric-triboelectric coupling functional film, and two metal electrodes. The ferroelectric-triboelectric coupling functional film comprises a first end fixed on the supporting beam in middle of the supporting frame, and a second end is freestanding. The two metal electrodes are grounded and adhered on the upper and lower sides of the supporting frame, respectively. An iron block is mounted on the top of the supporting frame. The ferroelectric-triboelectric coupling functional film includes a negative triboelectric charging layer, a ferroelectric composite material layer and a positive triboelectric charging layer; the ferroelectric composite material layer is prepared via casting method by mixing the ferroelectric material and the gas-sensitive material; the negative triboelectric charging layer has stronger electron affinity ability than the positive triboelectric charging layer, and attracts electrons from the positive triboelectric charging layer.

公开(公告)号：US20180186060A1

公开(公告)日：2018-07-05

申请号：US15893678

申请日：2018-02-11

申请人： University of Electronic Science and Technology of China

发明人： Weizhi Li ,  Jimeng Li ,  Yuming Wu ,  Xiaosong Du ,  Huiling Tai ,  He Yu

IPC分类号： B29C55/04 ,  C08J5/18 ,  B29C41/00 ,  B29C41/02 ,  B29C41/46 ,  B29C55/00

CPC分类号： B29C55/04 ,  B29C41/003 ,  B29C41/02 ,  B29C41/46 ,  B29C55/005 ,  B29K2027/16 ,  B29K2105/0073 ,  B29K2995/0003 ,  B29L2007/008 ,  C08J5/18 ,  C08J2327/16 ,  C08J2327/20

摘要： A method for preparing a pyroelectric polymer film based on a combined process of solution casting and uniaxial stretching is disclosed. The pyroelectric polymer film is firstly prepared by solution casting, afterwards, the casted film is subjected to uniaxial stretching when the film is in a semi-cured state (wet film). Thus a larger stretching ratio (>10) at a lower temperature (even at room temperature) is realized. Without undergoing a further poling process, the as-stretched film does have a fairly good pyroelectric performance. Moreover, the surface of the stretched film is smoother and having less surface defects.

公开(公告)号：US20180086893A1

公开(公告)日：2018-03-29

申请号：US15825109

申请日：2017-11-29

申请人： University of Electronic Science and Technology of China

发明人： Huiling Tai ,  Xueliang Ye ,  Zhen Yuan ,  Rui Guo ,  Yadong Jiang ,  Weizhi Li ,  Xiaosong Du

IPC分类号： C08K3/04 ,  C08F26/10 ,  C08F120/56 ,  C08G73/02 ,  C08F2/20

摘要： A carbon material-polymer strain sensitive film and its preparation method are disclosed. The carbon material-polymer strain sensitive film includes multiple layers of carbon sensitive films and multiple layers of polymer films, wherein the multiple layers of carbon sensitive films and the multiple layers of polymer films form a multi-layer composite film in sequence through a layer-by-layer assembly process. The preparation method includes steps of: cleaning, processing a hydrophilic treatment and processing a hydrophobic treatment on a rigid substrate in sequence; preparing a carbon material in dispersion solution and a polymer dispersion solution; through a layer-by-layer self-assembly process, growing the polymer and the carbon material in a form of layer-by-layer on the rigid substrate; transferring the composite film from the rigid substrate to a flexible substrate; and pasting two electrodes at two ends of the composite film and encapsulating with a flexible film.

公开(公告)号：US11235496B2

公开(公告)日：2022-02-01

申请号：US16188304

申请日：2018-11-13

申请人： University of Electronic Science and Technology of China

发明人： Weizhi Li ,  Yuming Wu ,  Xiaosong Du ,  Jimeng Li ,  Huiling Tai ,  Guangzhong Xie

IPC分类号： B29C41/00 ,  B29C41/46 ,  B29C41/52 ,  B29L7/00 ,  B29K27/00

摘要： A one-step solution casting method for preparing a PVDF-based pyroelectric polymer film is provided, which belongs to the technical field of functional material preparation. The method comprises steps of: treating a substrate with a hydrophilic reagent to obtain a hydrophilically-modified substrate, and then casting the organic solution of polyvinylidene fluoride (PVDF) or its copolymer on the hydrophilically-modified substrate. After cured, the as-casted PVDF-based film shows pyroelectricity without undergoing any stretching or poling post-treatment, indicates that the dipoles of the one-step prepared film are aligned. The self-polarization of the prepared film is attributed to a hydrogen bond induced layer-by-layer electrostatic self-assembly growth mechanism. The method is simple, low cost, high efficient, high capability to produce thick and large-area film with smooth morphology and ease to be scalized.

公开(公告)号：US10550240B2

公开(公告)日：2020-02-04

申请号：US15825109

申请日：2017-11-29

申请人： University of Electronic Science and Technology of China

发明人： Huiling Tai ,  Xueliang Ye ,  Zhen Yuan ,  Rui Guo ,  Yadong Jiang ,  Weizhi Li ,  Xiaosong Du

IPC分类号： B29D7/01 ,  C08J5/18 ,  B32B27/12 ,  C08K3/04 ,  C08F2/20 ,  C08F26/10 ,  C08F120/56 ,  B32B27/30 ,  B32B27/28 ,  C08G73/02 ,  G01N21/35 ,  G01Q60/24 ,  H01J37/28

摘要： A carbon material-polymer strain sensitive film and its preparation method are disclosed. The carbon material-polymer strain sensitive film includes multiple layers of carbon sensitive films and multiple layers of polymer films, wherein the multiple layers of carbon sensitive films and the multiple layers of polymer films form a multi-layer composite film in sequence through a layer-by-layer assembly process. The preparation method includes steps of: cleaning, processing a hydrophilic treatment and processing a hydrophobic treatment on a rigid substrate in sequence; preparing a carbon material in dispersion solution and a polymer dispersion solution; through a layer-by-layer self-assembly process, growing the polymer and the carbon material in a form of layer-by-layer on the rigid substrate; transferring the composite film from the rigid substrate to a flexible substrate; and pasting two electrodes at two ends of the composite film and encapsulating with a flexible film.

公开(公告)号：US10730226B2

公开(公告)日：2020-08-04

申请号：US15893678

申请日：2018-02-11

申请人： University of Electronic Science and Technology of China

发明人： Weizhi Li ,  Jimeng Li ,  Yuming Wu ,  Xiaosong Du ,  Huiling Tai ,  He Yu

IPC分类号： B29C55/04 ,  C08J5/18 ,  B29C41/00 ,  B29C41/02 ,  B29C41/46 ,  B29C55/00 ,  B29L7/00 ,  B29K27/00 ,  B29K105/00

摘要： A method for preparing a pyroelectric polymer film based on a combined process of solution casting and uniaxial stretching is disclosed. The pyroelectric polymer film is firstly prepared by solution casting, afterwards, the casted film is subjected to uniaxial stretching when the film is in a semi-cured state (wet film). Thus a larger stretching ratio (>10) at a lower temperature (even at room temperature) is realized. Without undergoing a further poling process, the as-stretched film does have a fairly, good pyroelectric performance. Moreover, the surface of the stretched film is smoother and has fewer surface defects.