Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Wang Wen,Zhang Zongbao,Cai Yangyang,Chen Jinshan,Wang Jianming,Huang Riyan,Lu Xubing,Gao Xingsen,Shui Lingling,Wu Sujuan,Liu Jun-Ming
In this work, perovskite solar cells (PSCs) with CH 3 NH 3 PbI 3- x
Cl
x
as active layer and spiro-OMeTAD as hole-transport media have been fabricated by one-step method. The methylammonium iodide (CH 3 NH 3 I) solution with different concentrations is used to modify the interface between mesoporous TiO 2 (meso-TiO 2 ) film and CH 3 NH 3 PbI 3− x
Cl
x
perovskite layer. Several techniques including X-ray diffraction, scanning electron microscopy, optical absorption, electrochemical impedance spectroscopy (EIS) and photoluminescence are used to investigate the effect of the interfacial modification. It is found that the interfacial modification by CH 3 NH 3 I enhance the crystallinity and increase the grain size of CH 3 NH 3 PbI 3− x
Cl
x
layer, and improve the surface wetting properties of perovskite precursor on meso-TiO 2 film. The sunlight absorption and external quantum efficiency of PSCs in the visible region with wavelength less than 600 nm have been improved. The Nyquist plots obtained from the EIS suggest that the CH 3 NH 3 I modification can reduce the charge recombination rates. The photoluminescence measurement shows that the exciton dissociation in the modified devices is more effective than that in the control samples. The photovoltaic performance of the modified devices can be significantly improved with respect to the reference (control) devices. The CH 3 NH 3 I modified devices at the optimized concentration demonstrate the average power conversion efficiency of 12.27 % in comparison with the average efficiency of 9.68 % for the reference devices.
研究领域:
材料科学
·
光伏技术
·
纳米科技
·
表面科学
·
半导体物理
·
能源材料
·
器件物理
✓ 已验证
DOI
高影响因子
ChemPlusChem
·
2016
·Vol. 81
·期 11
·1166-1173
·
IF 2.836
Xiaozhao Wang,Kui Cheng,Wenjian Weng,Huiming Wang,Jun Lin
Graphical Break away : Carbon quantum dots (CQDs) have been incorporated as a sensitizer into TiO 2 films to regulate the light-induced cell-detachment performance. This incorporation inhibits charge recombination of the TiO 2 system under UV illumination, which increases the negative surface potential and changes the secondary structure of adsorbed extracellular protein molecules, and consequently results in a faster release of cells (see figure). Carbon quantum dots (CQDs) have been incorporated as a sensitizer into TiO 2 films to regulate the light-induced cell-detachment performance. Depending on the amount of CQDs incorporated, nanodots or porous films are obtained. It was found that the right amount of CQDs incorporation significantly improves the cell-sheet detachment efficiency, and an intact cell sheet could be obtained after merely five minutes of UV illumination (365 nm, UV365), which is much faster than that from CQDs-free TiO 2 film. Furthermore, cell sheets on CQDs-sensitized TiO 2 films show improved viability, and alkaline phosphatase and collagen I activity either before or after light-induced detachment. The improved cell-detachment performance is ascribed to the effective inhibition of charge recombination of the TiO 2 film and the microstructure variations, which increase the negative surface potential and change the secondary structure of the adsorbed extracellular protein molecules; this results in a faster release of cells. It is suggested that the faster release reduces the possible detrimental impact on cell functions during detachment and helps in maintaining the excellent cellular activity. This study demonstrates that CQDs sensitization is an effective approach for optimizing the performance of light-induced cell-sheet harvest.
研究领域:
材料科学
·
生物材料
·
细胞工程
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
Functional Materials Letters
·
2024
·
IF 1.2
Bo Zhang,Hui Wang,Yiwei Lu,Yang Song,Yanlin Li,Yuanyuan Tian
Fabrication of electrochromic films with micro/nanostructures is one of the most feasible ways to improve their properties for high-performance electrochromic devices (ECDs). In this work, mesoporous TiO 2 and NiO electrochromic films are prepared by sol-gel technique with an auxiliary solvent of F108 (PEO 1 3 2 PPO 5 0 PEO 1 3 2 ). By adjusting the content of F108 and heat treatment temperature, the transparent and uniform mesoporous films are successfully prepared. The TiO 2 and NiO films are composed of inter-connected nanoparticles with a size of about 20 nm. The thicknesses of the films are about 300 nm and the mesoporous sizes are about 13 nm. The films have a short response time during the electrochromic process. When supplied with positive/negative voltages for 50 s, the coloring/bleaching times of TiO 2 and NiO mesoporous films are 15/13 and 17/12 s, respectively. The ECD fabricated with TiO 2 and NiO mesoporous films shows good electrochromic properties: short response time (14/19 s, for bleaching/coloring time), wide transmittance modulation range ( ∼ 37.21% at 540 nm), high coloration efficiency (CE) (100.6 cm 2 /C at 540 nm) and outstanding cycle stability (800 cycles). These are attributed to the mesoporous channels of films, which can increase reaction activity site, shorten ions transport path, and thus improve electrochromic reaction.
研究领域:
材料科学
·
纳米技术
·
电化学
·
薄膜技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 6
·6338-6343
·
IF 1.338
Du Yingying,Yang Ping,Liu Yunshi,Zhao Jie,He Haiyan,Miao Yanping
TiO2 films consisted of small nanoparticles were fabricated via a spinning coating method on fluorine doped in tin oxide (FTO) slide glass. After calcination, the films were subsequently sensitized by CdSe quantum dots (QDs) using mercaptopropionic acid (MPA) as a bifunctional
surface modifier. Upon UV light irradiation, CdSe QDs inject electrons into TiO2 nanoparticles, thus resulting in the generation of photocurrent in QD-sensitized solar cell. The results indicate that TiO2 films sensitized by CdSe QDs have achieved 1.5-fold enhancement
in photocurrent compared with pure TiO2 films, indicating that CdSe QDs can improve the photocurrent by promoting the separation of photoinduced charge carriers. In addition, the photocurrent enhances as the thickness of TiO2 films increased. Such improved photoelectrochemical
performance is ascribed to the basis of improved interfacial charge transport of the TiO2-CdSe composite films. Combining QDs on TiO2 thin films is a promising and effective way to enhance the photoelectrochemical performance, which is important in QD-sensitized solar
cell application.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
光化学
✓ 已验证
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 9
·798
·
IF 4
Zhiyong Fang,Lizhe Ma,Jieli Duan,Kefu Zhu,Xiangshu Zhang,Zhou Yang
The internal flow field and hydrodynamic properties of a photocatalytic reactor are crucial for the enhancement of degradation performance. In this study, TiO2films were loaded on the surface of quartz glass tubes and activated with UV-LEDs. Combining the degradation experiments with computational fluid dynamics (CFD) numerical simulations, the regulation laws of film surface area, flow field configuration, ratio of film surface area to solution volume (S/V), inlet flow rate and diameter on the reaction process were systematically evaluated. The results showed that the film surface area was positively correlated with the degradation efficiency of tetracycline hydrochloride (TCH). The degradation rate of TCH ranged between 32.15% and 64.83% in 12 equal film area flow field configurations. It was further found that the S/V value was positively correlated with the degradation efficiency only for the same flow field configuration, and the degradation rate of TCH was enhanced by 32.73% when the S/V value was increased from 0.018 m−1to 0.034 m−1. In addition, as the flow rate increases, the optimal inlet diameter increases accordingly (10, 25, 40, 55, and 70 mL/min corresponded to 10, 15, 20, 20, and 25 mm, respectively). The optimum structural parameters of the reactor were determined as follows: inlet flow rate of 10 mL/min, inlet diameter of 10 mm, flow field configuration type b, S/V value of 0.034 m−1, and height of 450 mm. The degradation rate of TCH under these conditions was 96.34%. The relationship between the film-reactor flow field and degradation efficiency of the photocatalytic reactor established in this study provides a reference for optimizing the design of tubular catalytic reactors.
研究领域:
环境工程
·
化学反应工程
·
计算流体力学(CFD)
·
光催化
·
反应器设计与优化
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Yuanyuan Tian,Xinyang Zhang,Enze Wu,Shengli Liu,Bo Zhang
In this study, amorphous TiO 2 nanofilm has been prepared by a pulsed magnetron sputtering method. The uniform amorphous TiO 2 nanostructure shows the excellent electrochromic performance in visible and near-infrared bands, including the wide transmittance modulations of 63.4 % at 460 nm and 22.1 % at 2000 nm, the short switching time of 9.4 s/8.6 s for coloring/bleaching, and the large coloration efficiency of 62.4 cm 2 /C at 460 nm. Furthermore, the amorphous TiO 2 nanofilm has the feasible energy storage property. The TiO 2 film exhibits a large areal capacitance with good rate performance (9.3 mF/cm 2 ). It provides an intuitive method for monitoring energy storage through changes in TiO 2 electrode color. In addition, the oxygen concentration and sputtered time have significant effects on the microstructure, crystallization and electrochemical properties of TiO 2 films. These results have significant guiding significance for the development of amorphous TiO 2 films and related advanced dual functional devices with electrochromism and energy storage.
研究领域:
材料科学
·
电化学
·
纳米技术
·
光学材料
·
薄膜技术
✓ 已验证
产品关联
DOI
高影响因子
THIN SOLID FILMS
·
2025
·
IF 2
Iram Hussain,Lisha Zhang,Zhizhen Ye,Jin-Ming Wu
In this work, a low-temperature method for creating nanostructured TiO 2 thin films with controlled morphologies for the photocatalytic degradation of the persistent antibiotic pollutant ofloxacin in water is presented. A Ti–H₂O₂ interaction was used to produce hydrogen titanate nanowires, which were subsequently converted into three different nanostructures: anatase nanowires by calcined at 450°C, porous nanorods and hierarchical nanoflowers by treating at 80°C for 72 hours with hot water and sulfuric acid, respectively. Controls over surface area, hydroxyl group contents, and crystal phase composition were made possible by these post-treatments. With a reaction rate constant of 0.72 h⁻¹ and a photocatalytic efficiency of 98% ofloxacin degradation in 4 hours under UV light, TiO 2 nanoflowers outperformed commercial benchmark P25 mixed phase TiO 2 nanoparticle films (0.64 h⁻¹) among the different nanostructures. The mixed anatase-rutile phase, high surface area of 49.1 m²/g, large pore volume of 0.15 mL/g, and numerous surface hydroxyl groups are responsible for the superior performance. These results show that morphology-engineered TiO 2 films can be used to treat water effectively through photocatalysis.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
光催化
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Xiao Yu,Xinyi Zhang,Yongjian Lai,Donghai Wang,Yong Liu
3D electrodes have shown extraordinary promise for electrochemical energy storage devices in wearable electronics. However, it is still a significant challenge to rationally design 3D electrode that has the characteristics of lightweight, flexibility, low cost, high performance and miniaturization. In this work, we present a novel design of 3D electrode by directly growing the nanocrystalline TiO 2 film on carbonized eggshell membrane. The unique architecture can supply not only a continuous electron transport pathway through an interconnected carbon fibrous network but also an efficient electrolyte flux via an interpenetrating porous network. Besides, nanocrystalline TiO 2 film on carbonized eggshell membrane offers a short ion diffusion path in the solid-phase, leading to a rapid kinetic of electrochemical reaction. When tested as an anode for Li-ion battery, TiO 2 film in 3D electrode demonstrated excellent electrochemical performance with a large reversible capacity, excellent rate capacity and long life cycling property.
研究领域:
材料科学
·
电化学
·
能量存储
·
纳米技术
·
可穿戴技术
✓ 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）