Well-aligned TiO2 nanorod arrays （TNAs） were prepared on pretreated quartz substrates via hydrothermal method.The effect of the different preparation conditions on the growth morphologies of TNAs was systematically ...Well-aligned TiO2 nanorod arrays （TNAs） were prepared on pretreated quartz substrates via hydrothermal method.The effect of the different preparation conditions on the growth morphologies of TNAs was systematically investigated by X-ray diffraction （XRD） and field-emission scanning electron microscopy （FE-SEM）.The photocatalytic properties were tested by photodegradation of a methyl blue solution.It is demonstrated that the hydrothermal reaction conditions,such as precursor concentration,hydrothermal reaction temperature,and hydrothermal reaction times,can greatly affect the growth of TNAs.Controlling the preparation process,TNAs with 2 μm in length and 140-170 nm in diameter and well-aligned orientation have been successfully prepared.The photocatalytic experiment results indicate that TNAs have much better photocatalytic activity than TiO2 nanoparticles.展开更多
微/纳尺度压力传感器可以检测来自外部环境的压力,分析所施加力的位置,大小和方向.这种压力传感器在电子屏幕、电子皮肤、运动监测、人工触觉系统等多个领域都有很高的应用需求.本文组装了一种可实现二维映射,基于图案化铌酸钾钠纳米棒...微/纳尺度压力传感器可以检测来自外部环境的压力,分析所施加力的位置,大小和方向.这种压力传感器在电子屏幕、电子皮肤、运动监测、人工触觉系统等多个领域都有很高的应用需求.本文组装了一种可实现二维映射,基于图案化铌酸钾钠纳米棒阵列的压力传感器矩阵.水热合成的正交相铌酸钾钠纳米棒具有优异的柔性和弹性,同时具有较高的压电性能.因此在组装的压力传感器矩阵中,单个单元尺寸低至200μm,灵敏度可达0.20 V N^(-1),检测限低至20 g,且器件的稳定性高.空间分离的传感器单元能有效避免交叉干扰,使器件能准确地实现自驱动压力成像,精确地分析外部压力刺激.展开更多
High density tungsten carbide nanorod arrays have been prepared by magnetron sputtering （MS） using the aluminum lattice membrane （ALM） as template. Electrocatalytic properties of nitromethane electroreduction on t...High density tungsten carbide nanorod arrays have been prepared by magnetron sputtering （MS） using the aluminum lattice membrane （ALM） as template. Electrocatalytic properties of nitromethane electroreduction on the tungsten carbide nanorod arrays electrode were investigated by electrochemical method, and their electrocatalytic activity is approached to that of the Pt foil electrode.展开更多
Power conversion efficiency(PCE) of quantum dot-sensitized solar cells(QDSSCs) was boosted in a TiO_2 composite film(TCSF) with delicate design in structure where TiO_2 hierarchical porous film(THPF) situated on the t...Power conversion efficiency(PCE) of quantum dot-sensitized solar cells(QDSSCs) was boosted in a TiO_2 composite film(TCSF) with delicate design in structure where TiO_2 hierarchical porous film(THPF) situated on the top of TiO_2 nanorod arrays film(TNAF). In this case, TNAF could supply efficient scattering centers for high light harvesting and direct electrical pathways for fast electron transfer while the THPF could offer porous channels for loading high quantity of previously synthetized quantum dots(QDs) and facilitate the penetration of electrolyte. Meanwhile, in this specific configuration, the presence of anatase–rutile heterojunction at the interface could help the rutile TNAF layer to efficiently collect photo-injected electrons from the anatase THPF layer thus suppressing the recombination of electrons and holes in electrolyte. The results showed that the PCE of QDSSC based on the TNAF photoanode was about 1.4-fold higher(η = 3.05%, J_(sc)= 15.86 m A cm^(-2), V_(oc)= 0.602 V, FF = 0.319) than that of device based on pure THPF(η = 2.20%, J_(sc)= 13.82 m A cm^(-2), V_(oc)= 0.572 V, FF = 0.278).展开更多
Well-aligned TiO2 nanorod arrays （TNAs） were prepared on the pretreated quartz substrates. The effect of the pretreatment conditions on the growth of TNAs was systematically investigated by X-ray diffraction （XRD）...Well-aligned TiO2 nanorod arrays （TNAs） were prepared on the pretreated quartz substrates. The effect of the pretreatment conditions on the growth of TNAs was systematically investigated by X-ray diffraction （XRD）, field-emission scanning electron microscopy （FE-SEM） and high-resolution transmission electron microscopy （HRTEM）. It is demonstrated that the pre-coating TiO2 crystal seeds on the substrates can greatly improve the growth orientation of TNAs. Rutile Ti02 crystal seeds induce the nucleation and growth of TNAs more preferably than the anatase TiO2 seeds. The growth density and diameter distribution of TNAs strongly depend on the TiO2 crystal seeds density. It is proved that TNAs with different morphologies can be controllably synthesized by using hydrothermal approach by pretreating substrates. The photocatalytic activity of TNAs was investigated by measuring the photodegradation rate of methyl blue aqueous solution under UV irradiation （254 nm）. And the results show that TNAs with large growth density and small diameter size exhibit relatively higher photocatalytic activity.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 50872011, 50672006, and 50402022)the National Basic Research Program of China (No. 2007CB613608)the New Cen-tury Excellent Talents Support Program of the Ministry of Education of China (NCET-07-0071 and NCET-08-0723)
文摘Well-aligned TiO2 nanorod arrays （TNAs） were prepared on pretreated quartz substrates via hydrothermal method.The effect of the different preparation conditions on the growth morphologies of TNAs was systematically investigated by X-ray diffraction （XRD） and field-emission scanning electron microscopy （FE-SEM）.The photocatalytic properties were tested by photodegradation of a methyl blue solution.It is demonstrated that the hydrothermal reaction conditions,such as precursor concentration,hydrothermal reaction temperature,and hydrothermal reaction times,can greatly affect the growth of TNAs.Controlling the preparation process,TNAs with 2 μm in length and 140-170 nm in diameter and well-aligned orientation have been successfully prepared.The photocatalytic experiment results indicate that TNAs have much better photocatalytic activity than TiO2 nanoparticles.
基金financially supported by the National Natural Science Foundation of China(NSFC,52072115,51972102,and U21A20500)Wang J acknowledges the support by A*STAR,under RIE2020 AME Individual Research Grant(IRG)(A20E5c0086),for the research conducted at the National University of Singaporesupported in part by a grant from the Key Laboratory of Wireless Sensor Network&Communication,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences(20190909)。
文摘微/纳尺度压力传感器可以检测来自外部环境的压力,分析所施加力的位置,大小和方向.这种压力传感器在电子屏幕、电子皮肤、运动监测、人工触觉系统等多个领域都有很高的应用需求.本文组装了一种可实现二维映射,基于图案化铌酸钾钠纳米棒阵列的压力传感器矩阵.水热合成的正交相铌酸钾钠纳米棒具有优异的柔性和弹性,同时具有较高的压电性能.因此在组装的压力传感器矩阵中,单个单元尺寸低至200μm,灵敏度可达0.20 V N^(-1),检测限低至20 g,且器件的稳定性高.空间分离的传感器单元能有效避免交叉干扰,使器件能准确地实现自驱动压力成像,精确地分析外部压力刺激.
基金National Nature Science Foundation of China(10804014)Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Micro Structure(SKL200802SIC)
基金the National Natural Science Foundation of China （No. 20276096, 20476097） the 0pening Foundation of Zhejiang Provincial Top Key Discipline.
文摘High density tungsten carbide nanorod arrays have been prepared by magnetron sputtering （MS） using the aluminum lattice membrane （ALM） as template. Electrocatalytic properties of nitromethane electroreduction on the tungsten carbide nanorod arrays electrode were investigated by electrochemical method, and their electrocatalytic activity is approached to that of the Pt foil electrode.
基金financially supported by the China Postdoctoral Science Foundation(2015M572210,2016M602376)the National Natural Science Foundation of China(61604110)+1 种基金the Hubei Natural Science Foundation of China(2017CFB291)the Foundation of Wuhan University of Science and Technology(2016XZ002)
文摘Power conversion efficiency(PCE) of quantum dot-sensitized solar cells(QDSSCs) was boosted in a TiO_2 composite film(TCSF) with delicate design in structure where TiO_2 hierarchical porous film(THPF) situated on the top of TiO_2 nanorod arrays film(TNAF). In this case, TNAF could supply efficient scattering centers for high light harvesting and direct electrical pathways for fast electron transfer while the THPF could offer porous channels for loading high quantity of previously synthetized quantum dots(QDs) and facilitate the penetration of electrolyte. Meanwhile, in this specific configuration, the presence of anatase–rutile heterojunction at the interface could help the rutile TNAF layer to efficiently collect photo-injected electrons from the anatase THPF layer thus suppressing the recombination of electrons and holes in electrolyte. The results showed that the PCE of QDSSC based on the TNAF photoanode was about 1.4-fold higher(η = 3.05%, J_(sc)= 15.86 m A cm^(-2), V_(oc)= 0.602 V, FF = 0.319) than that of device based on pure THPF(η = 2.20%, J_(sc)= 13.82 m A cm^(-2), V_(oc)= 0.572 V, FF = 0.278).
基金supported by the National Natural Science Foundation of China (Nos. 50872011 and 50772004)the National Basic Research Program of China ("973 Program", Grant No. 2007CB613608)the New Century Excellent Talents Support Program of Ministry of Education, China (NCET-07-0071, NCET-08-0723)
文摘Well-aligned TiO2 nanorod arrays （TNAs） were prepared on the pretreated quartz substrates. The effect of the pretreatment conditions on the growth of TNAs was systematically investigated by X-ray diffraction （XRD）, field-emission scanning electron microscopy （FE-SEM） and high-resolution transmission electron microscopy （HRTEM）. It is demonstrated that the pre-coating TiO2 crystal seeds on the substrates can greatly improve the growth orientation of TNAs. Rutile Ti02 crystal seeds induce the nucleation and growth of TNAs more preferably than the anatase TiO2 seeds. The growth density and diameter distribution of TNAs strongly depend on the TiO2 crystal seeds density. It is proved that TNAs with different morphologies can be controllably synthesized by using hydrothermal approach by pretreating substrates. The photocatalytic activity of TNAs was investigated by measuring the photodegradation rate of methyl blue aqueous solution under UV irradiation （254 nm）. And the results show that TNAs with large growth density and small diameter size exhibit relatively higher photocatalytic activity.
