Particuology
·
2023
·
IF 3.5
Ming Liu,Guoqiang Shao,Pengpeng Lv,Jun Li,Qingshan Zhu
Two critical parameters: Glossiness and chromaticity space of pearlescent pigments were evaluated based on crystallinity and grain size. Both the roughness and the vertical distance evolution along the surface of deposited TiO 2 film are affected by the crystallinity. The optimal crystallinity of TiO 2 was deposited at the temperature of 350 °C. The TiCl 4 concentration effectively changed the grain size. However, the high flow rate of fluidizing gas and optimal gas–solid ratio (<0.11 m 3 /(kg h)) restricted the change of TiCl 4 concentrations in fluidized bed reactor . In this case, the grain size of the deposited TiO 2 film was about 55 nm. Depending on the grain size, the color of pearlescent pigments was adjusted by controlling the film thickness based on TiO 2 concentration. Finally, the silver pearlescent pigment with high glossiness was prepared by chemical vapor deposition method in a fluidized bed reactor.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMPHYSCHEM
·
2015
·Vol. 16
·期 13
·2826-2835
·
IF 3.419
Shiwei Zhou,Yingying Wang,Ming Zhao,Li-Ping Jiang,Jun-Jie Zhu
Graphical Joining the dots: A core–shell–shell CdSeTe@CdS@ZnS quantum-dot-sensitized macroporous TiO 2 plate is built as a photoelectrochemical signal output system, and the film is modified further with biotin–DEVD–peptide, which can be cleaved specifically by caspase-3 and streptavidin-labeled alkaline phosphatase (SA-ALP), to assemble a multisignal-amplified photoelectrochemical platform. A macroporous TiO 2 film (M-TiO 2 ), which was prepared by burning off the polystyrene microsphere (PS) template from a PS/TiO 2 composite film, can provide a large active surface, improve electron-transport performance, and increase the photocurrent. Furthermore, core–shell–shell CdSeTe@CdS@ZnS quantum dots (QDs) were introduced to sensitize the M-TiO 2 film, which can efficiently broaden the absorption spectra range, separate and transfer charge carriers, reduce recombination loss, and improve photovoltaic response, with a sensitization shell of CdS and a passivation shell of ZnS. A multisignal-amplified photoelectrochemical platform was fabricated by further modifying this film with a combination of biotin–DEVD–peptide (Biotin–Gly–Asp–Gly–Asp–Glu–Val–Asp–Gly–Cys) (which is specifically cleaved by caspase-3) and streptavidin-labeled alkaline phosphatase (SA-ALP). Under the enzymatic catalysis of ALP with the substrate 2-phospho- L -ascorbic acid trisodium salt (AAP), ascorbic acid (AA) was generated as a better electron donor, leading to increased photocurrent output. The activity of caspase-3, which depends on the amount of residual peptide on the electrode, was inversely proportional to the amount of AA. By monitoring the variation of photocurrent caused by AA, caspase-3 activity and the therapeutic effect of nilotinib (a special medicine of chronic myeloid leukemia, CML) were indirectly detected and evaluated. The photoelectrochemical platform can be used as a potential evaluation system for monitoring caspase-3 activity and drug effects.
研究领域:
生物医学工程
·
光电化学
✓ 已验证
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2016
·
IF 4.732
Yaru Hou,Junyou Yang,Qinghui Jiang,Weixin Li,Zhiwei Zhou,Xin Li,Shuqin Zhou
By dipping the mesoporous TiO 2 film in Sr 2+ solutions and subsequent annealing, a modification layer of SrTiO 3 has been formed on the surface of the mesoporous TiO 2 film, and the effect of modification on the photovoltaic characteristics of the perovskite solar cells has been studied detailedly. The XPS and TEM results verified the existence and nature of the SrTiO 3 modification layer. Benifiting from the TiO 2 surface modification, the morphology of perovskite film and light absorption of the CH 3 NH 3 PbI 3 absorber have been improved effectively, and a faster charge transfer has also been achieved between the CH 3 NH 3 PbI 3 perovskite layer and the modified TiO 2 . As a result, an average conversion efficiency of 11.4% has been achieved in the perovskite solar cell based on the modified mesoporous TiO 2 by 10 mM Sr 2+ solution, and it increases approximately by 46% in comparison with the photovoltaic efficiency of 7.8% of the perovskite solar cell based the bare mesoporous TiO 2 layer.
研究领域:
材料科学
·
光伏技术
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yi Jiang,Yile Dai,Xianfei Xie,Qing Wang,Jianfeng Dai
In this work, we propose a strategy that is different from the traditional technology of increasing the specific area of the TiO2 film to improve the carrying capacity of QDs in QDSSCs. Transparent anatase TiO2 films are prepared by improving the optical transmittance of the photoanode TiO2 film so that the attached QDs can capture more photons and improve the efficiency of utilizing QDs. This QDSSC preparation technology sacrifices part of QDs loading but improves the utilization efficiency of QDs. At the same time, the transparent bulk TiO2 film decreases the transmission distance of photogenerated charge carriers, reduces the cross-interface transport, optimizes the transmission path, and reduces the carrier capture composite rate compared with the TiO2 particle film. Therefore, it not only increases the Voc, FF, and PCE of QDSSCs to 0.628 V, 54.7, and 6.166%, respectively, but also has greater transparency. It meets the demand for solar cell transparency in practical applications and has a wider range of applications and better aesthetics. The mechanism simulation and theoretical analysis of photothermal conversion and electromagnetic mechanism show that the barrier of carrier transfer in bulk transparent anatase TiO2 is lower than the physical barrier between anatase TiO2 NPs. The advantages of the anatase transparent TiO2 film in the process of photogenerated charge carrier transmission are verified. It provides an idea for the development of QDSSCs. It also brings the technology of transparent TiO2 film to related fields.
研究领域:
材料科学
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光伏技术
·
界面物理
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Cuicui Zhou,Shiqi Hong,Xinyu Chen,Quanfeng Li,Zongqi Chen,Songwang Yang
The electron transport layer (ETL) plays a critical role in efficient and stable perovskite solar cells (PSCs). The current effective method for the large-scale preparation of metal oxide ETLs is mainly based on expensive sputtering processes. Here, a screen-assisted self-spreading method is proposed as a novel approach to prepare uniformly thin and conformal TiO2 films on a rough fluorine-doped tin oxide (FTO) substrate as an ETL in planar PSCs. The TiO2 ETL deposited by this method exhibited good coverage and homogeneity on the rough FTO substrate, thereby minimizing interfacial recombination. The photovoltaic performance of the PSCs fabricated by this method is superior to that of the cells fabricated by spin coating, especially in terms of the fill factor. The performance enhancement can be attributed to the complete coverage of the FTO substrate by the conformal TiO2 film, confirming the effectiveness and reliability of the proposed method for the preparation of the TiO2 ETL. The advantages of this method lie in its scalability to prepare oxide films with a large area, eliminating the requirement of complex equipment, such as spinners, sputters, or physical vapor deposition equipment.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
PubMed
高影响因子
Environmental Technology & Innovation
·
2024
·
IF 6.7
Cheng Chang,Zitao Li,Saeed Rad,Lei Gan,Junfeng Dai,Asfandyar Shahab
The high demand for water treatment and environmental restoration via advanced oxidation process (AOP) has estimated the increased production of TiO 2 -based materials. Low cost, high transmittance, durability, and thermal stability, make the recycling low-iron crushed glass an excellent candidate for nano TiO 2 film coating via sol-gel process. Besides support selection, the reactor design plays a vital role in the final product's applicability and efficiency. In this work, small pieces (3–6 mm) of recycled low iron crushed glass were deep coated with multiple layers of nano TiO 2 film for photocatalytic degradation of selected contaminants in a new design packed-bed reactor. A multi-chamber packed-bed photocatalytic reactor was set up for efficient BOD degradation under UV light exposure. SEM, XRD, and BET analysis characterized coating characteristics, morphology, phase, and surface area. For film adherence and coating durability, SEM characteristics and durability of TiO 2 photocatalytic activity tests were performed after the second reutilization. Results revealed that the new reactor can achieve 45.81 up to 79.50% BOD 5 reduction after 24 to 48 h of circulation with constant operation, respectively. low iron crushed glass appeared to be a perfect support for TiO 2 film coating with a BET of 0.0742 m 2 /g after 9 cycles of coating. XRD results showed 95–97% anatase phase crystals with an average particle size of 12.97 nm with different rounds of annealing at 550 °C in muffle. Results underpinned that the technique seems promising to be applied on a large scale for pretreated industrial or pharmaceutical wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Xiumei Wan,Dan-feng Lu,Ran Gao,Jin Cheng,Zhi-mei Qi
A metal-clad optical waveguide sensor based on guided-mode resonance spectroscopy has been developed using a mesoporous TiO2 film as the chemical-sensitive core layer. The sol–gel block copolymer templated mesoporous TiO2 films are ∼275 nm thick, supporting both the transverse electric (TE) and transverse magnetic (TM) modes and thus providing the sensor with the TE- and TM-related dual sensitivities. Both the TE- and TM-mode resonance wavelengths (λR) at the same incident angle were obtained by broadband attenuated total reflection spectroscopy. The film porosity was determined to be ∼0.535 by using the combination of Fresnel formula and Bruggeman approximation to fit the measured values of λR. The TE- and TM-related sensitivities of the sensor to the two analytes of elaidic acid (EA) and Cr6+ were measured at the same incident angle. For each analyte, the TM-related sensitivity is higher than that with the TE-related one. The two sensitivities can be calibrated with each other. Moreover, by adjusting the block copolymer concentration in the coating solution, the mesoporous TiO2 films with different porosities were prepared for investigating the porosity dependence of the sensor’s sensitivity. The findings indicate that a larger-porosity TiO2 film can lead to higher sensitivity. The work demonstrated that the metal-clad mesoporous TiO2 film-based guided-mode resonance sensor is advantageous over a conventional SPR sensor for in situ detection of small molecules.
研究领域:
光学传感
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Yi Jiang,Yile Dai,Qing Wang,Jianfeng Dai
While transparent photoanodes are highly desired for smart energy devices, their performance is still far from expectation. In the present work, a transparent TiO2 film was prepared using a two-step spin-coating method, which served as photoanodes of quantum dot-sensitized solar cells (QDSSCs). A porous TiO2 photoanode prepared by P25 was also fabricated for comparison. Compared with the porous TiO2 photoanode, QDSSCs based on the transparent TiO2 film showed an obviously declined short-circuit current density (Jsc) but greatly improved fill factor (54.3%), resulting in a larger power conversion efficiency (4.32%). The reason is due to the decreased series resistance and increased shunt resistance of solar cells based on the transparent TiO2 photoanode, which is consistent with the requirement of solar cells to load resistance. The present work proves that the transparent TiO2 film has great potential in the field of transparent solar cells.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 5
·3104-3118
·
IF 3.094
Xiang Lv,Zhengyi Zhang,Zhiqiang Cao,Wei Jiang,Lifen Shi,Xiaojuan Zhao,Liyun Ma,Tianhe Wang,Shou Peng
A stable and translucent Bi@Bi 4 Ti 3 O 12 /TiO 2 film was fabricated on conventional glass substrates for the first time. The film exhibited a good photocatalytic performance and efficient self-cleaning capability against organic dyes under full spectral irradiation and visible light irradiation. Bi 4 Ti 3 O 12 /TiO 2 film was first prepared on a glass substrate with colloidal silica as a high temperature binder, followed by implantation of nanoscale Bi in it by an in-situ partially reduction of Bi 4 Ti 3 O 12 to generate Bi@Bi 4 Ti 3 O 12 /TiO 2 films. The improved photocatalytic ability is probably attributed to the surface plasmon resonance of Bi atom as well as the enhanced electron transfer efficiency and synergistic effect of Bi 4 Ti 3 O 12 and TiO 2 . According to trapping experiments, hydroxyl radicals (OH) were active species in the photocatalytic degradation of dyes under full spectral light irradiation and possible photocatalytic mechanism was proposed. The film prepared in this work may well have potential practical applications in many aspects, such as cleansing treatments for high building external decorative panels and also systematic characterization of the film suggests that the in-situ reduction is an effective and simple way to produce nanoscale Bi@Bi 4 Ti 3 O 12 .
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 6
·3049-3056
·
IF 2.961
Xu Bozheng,Wang Liying,Li Xuesong,Yang Xijia,Lü Wei
While transparent photoanode is highly desired for energy devices, its performance is still far from expectation. In the present work, a facile strategy was developed to prepare transparent TiO 2 films as photoanodes of quantum dot–sensitized solar cells (QDSSCs). Different TiO 2 nanoparticles (P25, rutile, anatase) were dispersed in C 16 H 36 O 4 Ti included solution and spin-coated on FTO glass, which is followed by sintering. The as-prepared TiO 2 films were used as photoanodes of QDSSCs. It has been shown that QDSSCs assembled by TiO 2 film prepared by P25 and N-butyl titanate slurry achieved the best performance. The transparency could be controlled by coating times, and the three-layer TiO 2 film showed the best performance with 2.70% of power conversion efficiency. Our work simplified the preparation process of TiO 2 slurry, shortened the preparation time, and realized the control of the crystal type proportion ofTiO 2 . It provides a new method for preparing transparent TiO 2 thin film for QDSSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2021
·
IF 1.556
Zhenyu Hu,Ruifeng Zheng,Wei Lü,Jialun Li,Xuesong Li,Yi Jiang,Xijia Yang,Liying Wang
While transparent solar cells are highly desired for smart energy devices, the general fabrication method is to sacrifice the film thickness of an electrode in exchange for a certain light transmittance, which limits the device performance. In this work, we developed a facile and economic strategy to prepare transparent TiO 2 films, which involved spin-coating n-butyl titanate on conductive FTO glass and sintering at suitable temperature. A transmittance up to ∼ 9 0 % in the visible and infrared range could be achieved. With the transparent TiO 2 film as photoanode of quantum dot sensitized solar cells, the highest power conversion efficiency was 2.92%. This work inspires new ways for the transparent electrode preparation of solar cells and provides a flexible and practical approach to anti-ultraviolet work, demonstrating its application potential in related fields.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2011
·
IF 2.827
Jing Yang,Kunqi Wang,Liang Liang,Ligang Feng,Yuwei Zhang,Bo Sun,Wei Xing
A hybrid photoelectrochemical biofuel cell is composed of a TiO 2 film conductive glass electrode sensitized by a copper chlorophyll trisodium salt in combination with the platinized cathode and the electrolyte which contains redox mediator and enzyme as catalyst. The photovoltaic measurements indicate the optimal dye-adsorption time is 4 h and the incident photon-to-collected electron conversion efficiency is 16% at 400 nm. From the current–voltage curve the open-circuit voltage, short-circuit current density, maximum power density and overall energy conversion efficiency are 468 mV, 482 μA/cm 2 , 97 μW/cm 2 and 9.7%, respectively.
研究领域:
生物工程
·
材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）