JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Y. Lu,S. Khan,C.L. Song,K.K. Wang,G.Z. Yuan,W. Li,G.R. Han,Y. Liu
The column-structured Nb-doped TiO 2 (TNO) films with various Nb concentrations in the range between 0 and 10 at.% have been prepared by a sol–gel method. The phase compositions, element concentrations, microstructures, and optical-electron properties have been characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, electron microscopy , and UV/Vis/Near-IR spectrophotometer. The experimental results show that all of the samples prepared in the present work exhibit column-structured morphology and Nb doping concentration has a non-monotonic effect upon the microstructure. The relatively low conductivity and high transmittance of the samples demonstrate that column-structured microstructures greatly improve the optical and electronic properties of TNO films. The favorable sample with 10 at.% Nb doping concentration exhibits a resistance of about 2.27 Ω cm and transmittance of approximately 68.78% with 85 nm thickness.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Zheng-peng Yang,Xuan Liu,Chun-jing Zhang,Bao-zhong Liu
Transparent photocatalytic surfaces are of ever increasing importance for the enhancement of the photocatalytic efficiency. Here, the highly ordered transparent TiO 2 nanotube arrays were prepared by the anodization and thermal annealing of titanium layer deposited onto the glass substrate , and a novel nonenzymatic piezoelectric sensor was developed for urea detection based on the modification of molecularly imprinted TiO 2 thin film onto transparent TiO 2 nanotube arrays. The performance of the fabricated sensor was evaluated and the results indicated that the sensor exhibited high sensitivity in urea detection, with a linear range from 0.04 to 120 μM and a limit of detection of 0.01 μM. Moreover, the sensor presented outstanding selectivity while used in coexisting systems containing various interferents with high concentration. The analytical application of the urea sensor confirmed the feasibility of urea detection in urine sample.
研究领域:
生物传感技术
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Wenzhang Li,Guanhua Jin,Haishi Hu,Jie Li,Yanghui Yang,Qiyuan Chen
Dye-sensitized solar cells (DSSCs) based on phosphotungstic acid–TiO 2 composites (PT) and WO 3 nanoparticle incorporated TiO 2 photoanodes were successfully constructed by doctor blading TiO 2 paste containing PT and various amounts of WO 3 . Film features were investigated by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, and ultraviolet–visible spectroscopy. Photoelectrochemical properties were examined by the photocurrent–voltage ( J – V ) curves as well as monochromatic incident photon-to-photocurrent conversion efficiency and electrochemical impedance spectroscopy (EIS) measurements. Compared with the DSSC based on pure P25 films, that based on PT/P25 films yielded a 16.9% higher J sc and a 21.3% higher η , while that based on PT/P25 + 1/70WO 3 films resulted in a 49.2% higher J sc and a 40.3% higher η . EIS data demonstrated that charge transfer resistance was clearly reduced by introducing PT and WO 3 into TiO 2 films. The introduction of PT and WO 3 was observed to promote electron transfer and retard recombination synergistically, leading to a significant improvement in cell performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Di Zhang,Pin Ma,Shuo Wang,Mingpeng Xia,Sidong Zhang,Dongmei Xie,Xiaowen Zhou,Yuan Lin
Recently, the pre-synthesized oil-soluble quantum dots (QDs) have triggered great interests due to advantages of monodispersity, stability and easy synthesis. Aggregation of QDs is the reason for low loading and poor efficiency during the in situ ligand exchange linker-assisted assembly process of preparing photovoltaic devices. In this work, we modify TiO 2 films with 4-mercaptobenzoic acid (MBA) as linkers and adjust modification time (MT) of MBA on the surface of TiO 2 films. As the MT increases from 0 to 6 min, even 360 min, loading amount of QDs and photovoltaic performance improve first and then decrease. The results of line scan in cross-sectional view of photoanodes show that QDs uniformly distribute throughout the short-MT films thickness, while obvious aggregation occur in the surface of long-MT films. The best device with 3 min of MBA modification exhibits an optimal efficiency of 5.58%.
研究领域:
材料科学
·
纳米技术
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2016
·
IF 1.34
Ya-hui YANG,Ren-rui XIE,Hang LI,Can-jun LIU,Wen-hua LIU,Fa-qi ZHAN
A novel WO 3– x /TiO 2 film as photoanode was synthesized for photoelectrocatalytic (PEC) reduction of CO 2 into formic acid (HCOOH). The films prepared by doctor blade method were characterized with X-ray diffractometer (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The existence of oxygen vacancies in the WO 3– x was confirmed with an X-ray photoelectron spectroscopy (XPS), and the accurate oxygen index was determined by a modified potentiometric titrimetry method. After 3 h of photoelectrocatalytic reduction, the formic acid yield of the WO 3– x /TiO 2 film is 872 nmol/cm 2 , which is 1.83 times that of the WO 3 /TiO 2 film. The results of PEC performance demonstrate that the introduction of WO 3– x nanoparticles can improve the charge transfer performance so as to enhance the performance of PEC reduction of CO 2 into formic acid.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Jing Guo,Bingkang Niu,Meng Chai,Ruirui Li,Zhengyi Chao,Junfang Liu,Chao Zhang,Weizhou Jiao,Guisheng Qi,Youzhi Liu
Normally, a transparent inert film is coated on the surface of TiO 2 particles to enhance the weatherability of the pigment. Liquid-phase coating process is mainly used in industry, which difficult to get really uniform films. This work combining nanoparticle fluidization technology with atomic layer deposition (ALD) technology to achieve precise surface modification of a large number of micro-nano particles. First, we explored the fluidization characteristics of TiO 2 nanoparticles in a home-made atmospheric fluidized bed ALD reactor (FB-ALD) to ensure the uniform fluidization of a large number of nanoparticles. Then TiCl 4 and H 2 O were used as precursors to deposit amorphous TiO 2 films on the surface of TiO 2 nanoparticles at 80 °C under atmospheric pressure, and the growth per cycle was about 1.09 Å per cycle. After 30 ALD cycles, the film thickness was about 3.1 nm, which could almost fully suppress the photocatalytic activity of TiO 2 . Compared with other traditional coating materials, amorphous TiO 2 has higher light refractive index, and realizes the suppression of the photocatalytic activity of TiO 2 without introducing other substances, demonstrating greater application potential in TiO 2 pigment coating field. The process is a gas-phase coating method, which is efficient, no waste water, and easy to scale up. This work shown the excellent property of interface engineering in improving pigment weatherability and can also provide guidance for the nanoparticle surface modification.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2013
·
IF 5.437
Kai Yan,Rui Wang,Jingdong Zhang
A novel photoelectrochemical (PEC) biosensing platform was constructed by assembling CdSe quantum dots (QDs) and DNA on liquid phase deposited TiO 2 (DNA–CdSe/TiO 2 ) film electrode. The transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis indicated that CdSe QDs were homogeneously assembled on TiO 2 film. The UV–visible diffuse reflectance spectra (DRS) showed that CdSe and DNA could effectively enhance the absorption of TiO 2 film to visible light. The obtained electrode showed a sensitive PEC response to o -aminophenol (OAP) under visible light irradiation . Due to the interaction between DNA and OAP, the response of OAP was improved by DNA immobilized on the sensing film. Under optimized conditions, the photocurrent was linearly proportional to OAP in the concentration range from 4.0×10 −7 to 2.7×10 −5 mol L −1 , with a detection limit (3 S/N) of 8.0×10 −8 mol L −1 . The novel strategy could provide a fast and sensitive method for OAP determination.
研究领域:
生物传感技术
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 16
·2200903
·
IF 10.05
Siyuan Huang,Renfu Zhang,Peipei Shao,Yiwen Zhang,Rui-Tao Wen
Electrochromic performance fading is inevitable upon extended cycling, and the limited lifetime greatly prevents large-scale commercialization of electrochromism-based devices. Here the origin of the performance degradation is uncovered and the performance restoration in TiO 2 thin films is explored. It is shown that, depending on the applied potential windows, the inserted ions are immobilized in α - traps resulting in a monotonous degradation of colored state, or immobilized in b - and modified α - traps leading to mutual degradation of colored and bleached state of the films. It is found by releasing the resided ions in various traps, the initial performance can be restored accordingly. Moreover, reversible sites and all traps are demonstrated to be interconvertible through an ion trapping and detrapping process. These results provide a general scope in understanding the electrochromism in oxide thin films and offer the scheme for potential traps control or even elimination, aiming at superior electrochromic devices.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Lei Tang,Zhixiang Zeng,Gang Wang,Eryong Liu,Longyang Li,Qunji Xue
In this paper, different apertures of superhydrophilic porous TiO 2 films are fabricated by sol-gel method with PEG2000 additive. The drag reduction effect of the films is investigated through experiment of falling-ball method and FEM simulation. The larger PEG2000 content, the bigger size and the more regular and homogeneous of the pores. The joint action of anatase crystal, hydroxyl groups and water molecules absorbed on the surface and porous structure causes the superhydrophilicity. The resistance test shows that when the addition amount of PEG2000 changes from 0.25 g to 2 g, the drag reduction efficiency increases from − 17.9% to 8.6% and − 16.8% to 9.4% with 12 mm and 25 mm diameter balls. The drag reduction mechanism can be obtained from Finite Element Method simulation. The result shows that vortexes are formed in the pore which can reduce the frictional drag by lowering the velocity gradient and giving a frictional driving force. Meanwhile, an “extra press drag” is formed between the front and back wall. If the degree of friction drag reduction is greater than the degree of press drag increase, the film will show the effect of drag reduction overall.
研究领域:
材料科学
·
流体力学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2015
·
IF 1.998
Xinying Qi,Ge Su,Guoshuai Bo,Lixin Cao,Wei Liu
NiO and NiO/TiO 2 films were prepared on fluorine doped tin oxide (FTO) coated glass substrates by electrochemial deposition and sol–gel method. Choline chloride–urea ionic liquid was used as electrodeposition media. The composition, morphology and microstructure of the films were characterized by a scanning electron microscope (SEM) and X-ray diffractometer (XRD). Cyclic voltammetry (CV), cycle life, response time and transmittance of the films were measured and compared with each other. Photocatalytic activity of the NiO/TiO 2 film was examined and explained through the degradation of methyl orange. Results show that, after 8000 cycles, both NiO and NiO/TiO 2 films still maintain their good electrochromic property and stability. The NiO/TiO 2 film not only performs excellent electrochromic function but also displays a certain photocatalytic activity. And interestingly, the NiO/TiO 2 film at bleached and colored states demonstrates different photocatalytic activities, which are higher than that at as-prepared state.
研究领域:
材料科学
·
电化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Zhibin Wang,Yingying Lin,Rong Chen,Qiang Liao,Xun Zhu,Liang An,Xuefeng He,Wei Zhang
In present study, a micro membrane-less photoelectrochemical cell (μML-PEC) is developed for simultaneous hydrogen and electricity productions in the presence of methanol, in which the photoanode of a TiO 2 film is consisted of a compact layer at the bottom and a porous layer on the top. The experimental results indicate the PEC miniaturization, and the membrane elimination, and the addition of a compact layer can enhance the mass, electron and photon transfer, which eventually boosts the performance. The performance of the developed μML-PEC is also evaluated under various operating conditions, including the light intensity, methanol and electrolyte concentrations and flow rate . It is shown that the maximum power density increases and the fill factor (FF) and solar-to-hydrogen conversion efficiency (STH) decrease with increasing the light intensity. For the electrolyte concentration, the maximum power density and STH and FF all increases with increasing the electrolyte concentration. Once the electrolyte is high enough, its effect become insignificant. Besides, the increase of the methanol concentration and the decrease of the flow rate are beneficial for the improvement in the performance. The obtained results reveal that the μML-PEC developed in this work shows the promising potential for simultaneously producing electricity and hydrogen in the presence of methanol.
研究领域:
能源科学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2016
·
IF 9.407
Jun Shao,Songwang Yang,Lei Lei,Qipeng Cao,Yu Yu,Yan Liu
Pore size and porosity of the porous materials play an important role in catalysis, dye-sensitized solar cells and mesoscopic perovskite solar cells (PSC), etc. Increasing pore size and porosity of mesoporous TiO2 is crucial for facilitating pore-filling of perovskite, charge extraction on TiO2/CH3NH3PbI3 interface and thus cell performance enhancement. Highly porous TiO2 films (TFs) with a large pore size that extends the limit of particle size have been achieved through a novel TiO2 paste using copolymer P123 as a pore-adjusting agent and 2-butoxyethyl acetate as a solvent. A highly porous structure with the pore size of 34.2 nm and porosity of 73.5% has been obtained, the porosity of which is the largest that has ever been reported in the screen-printed TiO2 thick films. The pore size and porosity of TFs can be successively adjusted in a certain range by tuning the P123 content in the pastes. As particle size and surface area of TFs are kept almost constant, the specific investigation on the effect of varied pore size on the performance of bilayer-structured PSCs becomes possible. The hysteresis phenomenon, the notorious problem of PSCs, is found to depend greatly on pore size and porosity of TFs, that is, pore-filling of perovskite. The suppressing effect of highly porous TFs on hysteresis by avoiding charges accumulation on the interface due to enhanced interfacial contact is proved by the invariable photocurrent response after prebias treatment. A hysteresis-free solar cell with an efficiency of 15.47% was achieved by depositing a 242 nm-thick perovskite capping layer upon 350 nm-thick TF with a pore size of 34.2 nm. This method developed for the preparation of highly porous TFs provides a new way to fabricate hysteresis-free PSCs and is widely applicable for the fabrication of other mesoporous metal oxide films with large pore sizes.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）