APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yaocheng Deng,Lin Tang,Guangming Zeng,Haoran Dong,Ming Yan,Jingjing Wang,Wei Hu,Jiajia Wang,Yaoyu Zhou,Jing Tang
Polyaniline (PANI) modified mesoporous single crystal TiO 2 microsphere (PANI/MS-TiO 2 ) with excellent photocatalytic activity was successfully prepared by a simple method of solution evaporation and chemisorption. The X-ray diffraction characterization demonstrated that the whole MS-TiO 2 kept the crystal type of anatase. The nitrogen adsorption-desorption characterization coupled with scanning electron microscopy indicated that the MS-TiO 2 possessed a unique mesoporous structure with high specific surface area, which resulted in the increased load of PANI on the surface of MS-TiO 2 and multiple light reflection in the photocatalyst. The UV–vis diffuse reflectance spectra confirmed that PANI/MS-TiO 2 presented more absorption ability in the visible light range than that of the pristine MS-TiO 2 . The transient photocurrent responses and electrochemical impedance spectroscopy (EIS) indicated the high photo responses and fast photogenerated charge separation efficiency of PANI/MS-TiO 2 . The photocatalytic activity of the PANI/MS-TiO 2 was evaluated by the photodegradation of RhB and MB under visible light irradiation. MS-TiO 2 photocatalyst with different molar ration of PANI had been prepared, and the results showed that the optimal photocatalyst (PANI/MS-TiO 2 (1:40)) exhibited the highest photocatalytic efficiency which is nearly three times as great as that of pristine MS-TiO 2 for the degradation of the RhB and MB under visible light irradiation. The remarkable performance of the PANI/MS-TiO 2 under visible light was attributed to its mesoporous single crystal structure with large surface, conductivity, as well as the synergistic effect between PANI and MS-TiO 2 .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Junfang Li,Qinhui Xie,Junbo Li,Lei Sun,Yunfei Xie,Yukihiro Ozaki,Wei Ji
Semiconductor materials represent an ideal choice for designing surface-enhanced Raman scattering (SERS)-based sensors due to their superior thermal and chemical stability compared to conventional metal materials. However, current SERS-active semiconductor substrates have limitations such as low detection sensitivity and often complicated preparation steps, which restrict their real-life applications. In this work, for the first time the feasibility of large-area fabricating SERS-active semiconductor substrates based on screen-printing of micron-sized TiO 2 ink synthesized through a simple flame thermal-assisted method is demonstrated. The resultant TiO 2 microspherical arrays (MSAs) exhibit extraordinary SERS sensitivity with an enhancement factor of 3.28 × 10 7 , which represents one of the highest sensitivity and are the easiest strategy among the reported SERS-active semiconductor substrates. Both experiments and simulations rationalize the observed enhancement factor and propose that multiple synergistic resonances, including Mie resonance, charge-transfer resonance, and molecular resonance significantly boost the performance of semiconductor substrates. Dye-modified TiO 2 MSAs are further exploited as the sensing platform for the development of a ratiometric SERS sensor, enabling the highly sensitive, selective, low cost, and stable detection of Hg 2+ ions. This study opens up new possibilities for preparing a large-scale SERS-active semiconductor array, ultimately advancing the fields of semiconductor-based SERS sensing technology.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Hong Tao,Wanping Chen,Jing Wang,Weijun Ke,Jiawei Wan,Jionghua Wu,Guo-jia Fang
Size controllable anatase TiO 2 microspheres with compact nano-aggregate structures are synthesized via a facile and low-temperature solvothermal treatment. The diameters of as-prepared products can be controlled to vary from 250 to 1100 nm. Different kinds of TiO 2 microsphere films are built on the top of TiO 2 nanoparticle underlayer to prepare a type of bi-layer anodes. It is illustrated that this type of TiO 2 microsphere scattering layer can not only increase the absorption of light, but also improve the carrier transport and charge collection efficiency of dye sensitized solar cell (DSSC). Therefore, an optimized efficiency of 8.20% is achieved for DSSC with a scattering layer consisted of 500 nm TiO 2 microspheres. Then we further optimize the interface of TiO 2 microsphere scattering layer through TiCl 4 treatment and Mg 2+ modified TiCl 4 treatment. TiCl 4 treatment can improve the dye adsorption and connections between the TiO 2 microspheres. However, it also generates more surface defects in the meantime. And through the Mg 2+ modified TiCl 4 treatment, we can increase the dye adsorption density and retard the interfacial charge recombination and decrease the surface defects, simultaneously. As a result, the efficiency of DSSC based on bi-layer anode is enhanced from 8.20% to 9.12%.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 1
·212-220
·
IF 2.324
Hu Zhen,Zhao Li,Guo Haiyong,Wang Shimin,Li Wenlu,Yang Xiaojie,Dong Binghai,Wan Li
A novel composite double-layer film was developed using TiO 2 /La(OH) 3 :Yb 3+ /Er 3+ nanoparticles (P25/UC) and porous-hollow TiO 2 microspheres (PHTS) for highly efficient dye-sensitized solar cells (DSSCs). P25/UC was used as the first layer and coated onto fluorine-doped tin oxide glass substrate to create a good contact and upconversion effect. The P25/UC layer can absorb and convert infrared light into visible red and green light, increasing light utilization. PHTS has a large size and a high specific surface area, was deposited onto the surface of the P25/UC film to improve the light scattering performance and dye adsorption of solar cells. The P25/UC composite double-layer film (P25/UC + PHTS) achieved the highest short-circuit current density of 20.33 mA/cm 2 and photoelectron conversion efficiency of 8.89% due to the synergistic effect of the upconversion layers and light-scattering layers, which increased by 51.26% and 38.04% compared with that of the pure P25 film photoelectrode.
研究领域:
材料科学
·
能源技术
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Xin-Zheng Yue,Chuan-Qi Li,Zhong-Yi Liu,Sha-Sha Yi,De-Liang Chen,Feng Wang,Shuai-Hui Li
The constructing of functional materials with well-defined nanostructure , showing efficient charge separation and transportation properties, has been intensively and in depth investigated to fabricate catalysts for H 2 generation from solar-driven water reduction. Here we demonstrate that loading W 2 C@C structure in which each W 2 C nanoparticle (NP) is wrapped by carbon shell on surface of hollow TiO 2 microspheres (HTMs) can enhance the separation of photogenerated electron-hole pairs by building an internal electric field in W 2 C@C/HTMs composite structure and act as the reaction active sites for water reduction. As expected, the optimized W 2 C@C/HTMs construction exhibits the highest photocatalytic H 2 generation rate of 6.91 mmol h −1 g −1 under simulated solar light illumination, over 20 times larger than that of bare HTMs. The underlying mechanism has been investigated from the perspective of photochemistry and photophysics based on a series of characterization techniques, which suggests that W 2 C@C can effectively steer the charge kinetics, maximizing the charge carriers’ separation.
研究领域:
材料科学
·
光催化
·
纳米技术
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 15
·20104-20114
·
IF 2.478
Sun Junchen,Fang Min,Zhu Weiju,Wu Zhenyu,Li Cun
SiO 2 @TiO 2 -Ag (STA) microspheres decorated with Ag nanoparticles (Ag NPs) were prepared and assembled into the photoanode. The photoanode composed of STA microspheres and TiO 2 nanoparticles (P25) was prepared by doctor blade method. UV–vis measurement indicates that the introduction of a few STA microspheres observably enhances the light scattering and capturing ability of the photoanode. The photoelectric conversion efficiency of the DSSCs with 2wt% STA photoanode increased to 7.4% from 4.3% comparing with pure P25 TiO 2 nanoparticles. The configuration DSSCs have the maximum short circuit current density ( J sc ) of 16.0 mA cm −2 and open-circuit voltage ( V oc ) of 0.780 V, which are significantly higher than the pure TiO 2 DSSCs. The significant improvement of the DSSCs performance can be due to the synergistic effect of the superior light scattering of STA and the localized surface plasma resonance (LSPR) effect of Ag NPs modified on the microspheres surface.
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
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yuan Li,Yusheng Zhou,Yong Wang,Ru Zhou,Qiang Ling,Haihong Niu,Wei Zhang,Chaoqun Wang,Jihong Qiu,Zhiqiang Guo,Jinzhang Xu
Urchin-like TiO 2 hierarchical microspheres (UTHMs) with an extremely large surface area of 331 m 2 g −1 were synthesized via a facile one-pot hydrothermal method and studied for dye-sensitized solar cells (DSSCs) application. In-situ growth of Au nanoparticles (NPs) on the surface of the UTHMs were further conducted to achieve Au-decorated UTHMs (Au-UTHMs). A series of novel composite photoanode films were designed through the combined use of Au-UTHMs and UTHMs at different mass ratios. The DSSC constructed with the composite photoanode prepared under an optimal Au-UTHMs to UTHMs ratio of 2 wt% yields a considerable power conversion efficiency of 7.21%, which was markedly higher than that of the pure P25 NPs based device (5.19%) and pure UTHMs based device (6.10%). The significantly enhanced performance of the composite photoanode based DSSC can be attributed to the synergistic effect of two benefits: (1) the large specific surface area, strong light scattering and fast electron transfer channels arising from the novel hierarchical features of UTHMs, and (2) the enhanced light absorption owing to the localized surface plasmon resonance (LSPR) effect of Au NPs.
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
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Jingcheng He,Qingju Liu,Yumin Zhang,Xinbo Zhao,Genlin Zhang,Bin Xiao,Kaixin Fu
C–TiO 2 microspheres were prepared in situ through microwave-assisted solvothermal method followed by low-temperature heat treatment in this study. Different carbon content doping samples were obtained through different temperatures of heat treatment. The characterization results indicate that C–TiO 2 samples are exclusively composed of anatase crystallites, and also the interstitial carbon and the surface carbonate species are confirmed existed in the samples, which could significantly enhance the photocatalytic activity under visible light. When irradiated for 60 min under 5 W visible-light, the degradation efficiency of 40 mg/l methylene blue (200 mg catalyst) and 10 mg/l methyl orange (100 mg catalyst) can reach 92.59% and 98.42%, respectively, which is significantly higher than that of commercial titania P25 (5.74% and 24.53%, respectively). In addition, the sample exhibits excellent recyclability and stability, which might be considered as a novel and facil scheme for modification of titania photodegradation driven by visible light.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHROMATOGRAPHIA
·
2022
·Vol. 85
·期 4
·365-371
·
IF 2.213
Mei Ling,Tang Hao,Wang Shuai,Guo Yong,Liang Xiaojing
Sub-2-µm sea-urchin-like TiO 2 microspheres were prepared through the one-step solvothermal method. Results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that there are a lot of nanorods coming out from the center of the TiO 2 microsphere, making it look like a sea urchin. The morphology and structure of these microspheres are very suitable for chromatographic packing. During the separation of inorganic anions on this new stationary phase, the retention mechanism is electrostatic interaction, and the pH of the mobile phase plays an important role in retention behaviors. With this new stationary phase for separation of organic anions and nucleobases, Lewis acid–base interaction is more outstanding, which can cause peak broadening and tail for larger conjugated structure compounds. The separation of aromatic hydrocarbons on this new stationary phase demonstrates that Lewis acid–base interaction has a favorable influence on the separation of electron-rich aromatic hydrocarbons under normal phase chromatographic conditions. Graphical abstract
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Li Qiao,Ning Gan,Jiayu Wang,Huiju Gao,Futao Hu,Hongfei Wang,Tianhua Li
A novel 8-electrode array as stir bar was designed for selective extraction of trace level exogenous estrogens from food samples, followed by liquid desorption and HPLC-photodiode array detection. The array consisted of 8 screen-printed electrodes and each electrode was modified with Fe 3 O 4 @meso-/macroporous TiO 2 microspheres and molecularly imprinted film (m-TiMIF). The fabrication of the imprinted film coating was very simple without organic solvents and chemical grafting. Both bisphenol A (BPA) and diethylstilbestrol (DES) were employed as templates in m-TiMIF fabrication in order to enrich both targets simultaneously. Interestingly, the imprinted stir bar array showed higher extraction capacity and selectivity for BPA and DES than the non-imprinted counterpart. Meanwhile, it exhibited fast adsorption and desorption kinetics due to increased mass transport in the ultra-thin film. Importantly, the m-TiMIF coating was robust enough for at least 20 uses without obvious alteration in extraction performance. The main parameters affecting the extraction efficiency, including stir speeding, sample pH, ionic strength, extraction time, desorption solvent and time, were optimized. Under optimal experimental conditions, the limits of detection (S/N = 3) of the developed method were 0.28 and 0.47 μg L −1 for BPA and DES respectively, with enrichment factors of 32.6 and 52.8-fold. The linear ranges were 3.0–1500 μg L −1 and 4.0–1500 μg L −1 for BPA and DES, respectively. The m-TiMIF-coating conferred better recovery and selectivity, compared with the commercial stir bar coating. The new method was successfully applied to assess BPA and DES in pork and chicken samples with satisfactory recovery.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 40
·期 1
·755-763
·
IF 3.086
Zhihong Zhang,Hongfei Ji,Shuai Zhang,Donglai Peng,Qixuan Fu,Minghua Wang,Linghao He,Lingyu Yue
We report a novel nanocomposite of hollow TiO2 microspheres and plasma polyacrylic acid (TiO2@PPAA) modified with rhodamine B (TiO2@PPAA-RhB). This nanocomposite was further used as an electrochemical sensor for the ultra-sensitive and selective detection of Cu2+ in water. A gold electrode was modified with hollow TiO2 nanospheres, followed by the closely bonded layer of PPAA via plasma polymerization. Subsequently, the carboxyl groups of TiO2@PPAA nanocomposites were activated to ester groups by N-hydroxysuccinimide/1-ethyl-3-(3-dimethylaminoprolyl) carbodiimide hydrochloride. The resultant activated ester groups reacted with the amino groups on rhodamine to form the amide groups, leading to the modification of TiO2@PPAA nanocomposites with rhodamine. Considering the synergistic effect of strong electrostatic interaction between the carboxyl groups of PPAA and Cu2+, the direct adsorption of Cu2+ on the TiO2 surface, and the coordination chemistry formed between Cu2+ and rhodamine, the developed electrochemical biosensor exhibited high sensitivity of Cu2+ detection, with a detection limit of 0.404 pM within the range of 0.001–10 nM of Cu2+. Therefore, the fabricated electrochemical sensor based on TiO2@PPAA-RhB can be obtained via plasma polymerization and represents a highly promising tool for use in environmental monitoring.
研究领域:
电化学
·
材料科学
·
环境监测
✓ 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）