Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential applications.However,the inherent brittleness and unsatisfactory piezoelectric...Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential applications.However,the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified applications.Here,flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators(PENGs)and stress/temperature/light sensors.The open cir-cuit voltage(V_(oc))and the density of short circuit current(I_(sc))of the PENG based on the PVDF/5 wt%6H-SiC composite fiber films reach 28.94 V and 0.24μA cm^(-2),showing a significant improvement of 240%and 300%compared with that based on the pure PVDF films.The effect of 6H-SiC nanoparticles(NPs)on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element analysis.The stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding stimuli.This study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.展开更多
With the aim of producing simple and effective transparent conducting electrodes, the conducting polymer poly(3-hexylthiophene) (P3HT) incorporated with reduced graphene oxide film (rGO) (called rGO-P3HT) was prepared...With the aim of producing simple and effective transparent conducting electrodes, the conducting polymer poly(3-hexylthiophene) (P3HT) incorporated with reduced graphene oxide film (rGO) (called rGO-P3HT) was prepared by spin-coating method. Structural, electrical and optical characterization showed that rGO-P3HT films 9.0 wt% P3HT exhibited good stability when exposed to the ambient atmosphere. These composite films of 200 nm thickness possess a sheet resistance and transparency of R□~ 17Ω and T ~ 72%, respectively. Owing to containing conducting polymer, rGO-P3HT-coated glass could be efficiently used in photovoltaic applications, in organic solar cells in particular, with the replacement of the indium tin oxide (ITO) and fluorine tin oxide (FTO) electrodes.展开更多
采用微波水热法合成制备出NBT(Na 0.5 Bi 0.5 TiO 3,简称NBT)粉体,以及固相法合成了钛酸锶(SrTiO 3,简称ST)粉体,再采用溶液流延法分别制备填充了不同NBT含量的NBT-ST/PVDF复合膜,并研究了不同含量的NBT对复合膜击穿场强与储能密度的影...采用微波水热法合成制备出NBT(Na 0.5 Bi 0.5 TiO 3,简称NBT)粉体,以及固相法合成了钛酸锶(SrTiO 3,简称ST)粉体,再采用溶液流延法分别制备填充了不同NBT含量的NBT-ST/PVDF复合膜,并研究了不同含量的NBT对复合膜击穿场强与储能密度的影响.研究结果表明:在NBT含量为0.5%时,复合膜具有最大的储能密度,达到8.5 J/cm ^3.展开更多
以聚偏氟乙烯(PVDF)作为Cd_xZn_(1-x)Se_yS_(1-y)量子点微封装材料,利用简易刮涂法工艺成功制备出大面积、高稳定性的Cd_xZn_(1-x)Se_yS_(1-y)量子点/PVDF纳米复合薄膜,同时对该纳米复合薄膜的结构、形貌及光学性能进行表征和分析,并进...以聚偏氟乙烯(PVDF)作为Cd_xZn_(1-x)Se_yS_(1-y)量子点微封装材料,利用简易刮涂法工艺成功制备出大面积、高稳定性的Cd_xZn_(1-x)Se_yS_(1-y)量子点/PVDF纳米复合薄膜,同时对该纳米复合薄膜的结构、形貌及光学性能进行表征和分析,并进一步研究纳米复合薄膜的水热稳定性。研究结果表明,使用刮涂工艺制备的Cd_xZn_(1-x)Se_yS_(1-y)量子点/PVDF纳米复合薄膜仍然保持优良的荧光光致发光特性,利用该工艺能够实现大面积8 cm×15 cm Cd_xZn_(1-x)Se_yS_(1-y)量子点/PVDF纳米复合薄膜制备,该薄膜在紫外灯照射下发出明亮红光。通过PVDF和Cd_xZn_(1-x)Se_yS_(1-y)量子点的复合,将得到的复合薄膜在沸水中沸煮240min发光性能基本不会发生变化,具备超高的稳定性。展开更多
基金supported by the National Science Fund for Distinguished Young Scholars(No.52025041)the National Natural Science Foundation of China(Nos.51902020,51974021,and 52250091)+2 种基金the Fundamental Research Funds for the Central Universities of NO.FRF-TP-20-02C2This project is supported by the S tate Key Laboratory of Featured Metal Materials and Lifecycle Safety for Composite Structures,Guangxi University(Grant No.2021GXYSOF12)the Interdisciplinary Research Project for Young Teachers of USTB(Fundamental Research Funds for the Central Universities)(No.FRF-IDRY-21-028).
文摘Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential applications.However,the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified applications.Here,flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators(PENGs)and stress/temperature/light sensors.The open cir-cuit voltage(V_(oc))and the density of short circuit current(I_(sc))of the PENG based on the PVDF/5 wt%6H-SiC composite fiber films reach 28.94 V and 0.24μA cm^(-2),showing a significant improvement of 240%and 300%compared with that based on the pure PVDF films.The effect of 6H-SiC nanoparticles(NPs)on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element analysis.The stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding stimuli.This study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.
文摘With the aim of producing simple and effective transparent conducting electrodes, the conducting polymer poly(3-hexylthiophene) (P3HT) incorporated with reduced graphene oxide film (rGO) (called rGO-P3HT) was prepared by spin-coating method. Structural, electrical and optical characterization showed that rGO-P3HT films 9.0 wt% P3HT exhibited good stability when exposed to the ambient atmosphere. These composite films of 200 nm thickness possess a sheet resistance and transparency of R□~ 17Ω and T ~ 72%, respectively. Owing to containing conducting polymer, rGO-P3HT-coated glass could be efficiently used in photovoltaic applications, in organic solar cells in particular, with the replacement of the indium tin oxide (ITO) and fluorine tin oxide (FTO) electrodes.
文摘采用微波水热法合成制备出NBT(Na 0.5 Bi 0.5 TiO 3,简称NBT)粉体,以及固相法合成了钛酸锶(SrTiO 3,简称ST)粉体,再采用溶液流延法分别制备填充了不同NBT含量的NBT-ST/PVDF复合膜,并研究了不同含量的NBT对复合膜击穿场强与储能密度的影响.研究结果表明:在NBT含量为0.5%时,复合膜具有最大的储能密度,达到8.5 J/cm ^3.
文摘以聚偏氟乙烯(PVDF)作为Cd_xZn_(1-x)Se_yS_(1-y)量子点微封装材料,利用简易刮涂法工艺成功制备出大面积、高稳定性的Cd_xZn_(1-x)Se_yS_(1-y)量子点/PVDF纳米复合薄膜,同时对该纳米复合薄膜的结构、形貌及光学性能进行表征和分析,并进一步研究纳米复合薄膜的水热稳定性。研究结果表明,使用刮涂工艺制备的Cd_xZn_(1-x)Se_yS_(1-y)量子点/PVDF纳米复合薄膜仍然保持优良的荧光光致发光特性,利用该工艺能够实现大面积8 cm×15 cm Cd_xZn_(1-x)Se_yS_(1-y)量子点/PVDF纳米复合薄膜制备,该薄膜在紫外灯照射下发出明亮红光。通过PVDF和Cd_xZn_(1-x)Se_yS_(1-y)量子点的复合,将得到的复合薄膜在沸水中沸煮240min发光性能基本不会发生变化,具备超高的稳定性。
