MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2015
·
IF 1.955
Yonggan Hao,Xiankun Shao,Benxia Li,Luyang Hu,Tao Wang
The Au/TiO 2 hybrid nanofibers composed of mesoporous TiO 2 nanofibers and Au nanoparticles were synchronously fabricated by integrating a facile electrospinning technique and subsequent annealing in air. The Au loading content in the hybrid nanofibers was regulated by varying the dosage of chlorauric acid added in the precursor solution . The compositions, microstructures and optical response properties of the Au/TiO 2 hybrid nanofibers were characterized. The UV–vis spectra of the as-prepared hybrid fibers reveal two absorption bands belonging to the band gap absorption of TiO 2 and the surface plasmon resonance (SPR) of Au nanoparticles. For the catalytic reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride , the apparent reaction rate constant is raised but TOF value of the catalyst decreases, as the Au loading amount in the hybrid fibers increases. This is because the Au nanoparticles with smaller sizes have higher total surface areas at the same weight and therefore show higher catalytic activity . This method for producing Au/TiO 2 hybrid nanofibers is versatile and can be extended to the fabrication of other hybrid nanofibers composed of various noble metal nanoparticles and other mesoporous metal oxide nanofibers, designing of highly efficient catalysts for more important chemical reactions.
研究领域:
材料科学
·
催化化学
✓ 已验证
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
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Hong Xiao,Wenjun Guo,Bin Sun,Meishan Pei,Guowei Zhou
A series of mesoporous TiO 2 nanotubes/reduced graphene oxide (TiO 2 NT/RGO) and Co-doped TiO 2 NT/RGO composites were synthesized via a hydrothermal method. In this method, graphene oxide (GO) was reduced to RGO, whereas TiO 2 NT and Co-doped TiO 2 NT were prepared using poly(ethylene-glycol)-block-poly(propy glycol)-block-poly(ethylene-glycol) as a structure-directing agent through a simple solvothermal route. Their morphology and properties were determined using X-ray diffraction, field emission scanning electron microscopy, UV–vis diffuse reflectance spectra, and Raman measurement. Results indicated that TiO 2 NT displayed mesoporous structures with lengths ranging from about 3 μm to 10 μm, tube diameters ranging from about 400 nm to 600 nm, wall thickness of about 250 nm, and mesoporous walls of about 6 nm. The electrochemical performance of the TiO 2 -based electrodes for supercapacitor was confirmed by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge–discharge in 0.5 mol L −1 Na 2 SO 4 aqueous electrolyte solution. The Co-doped TiO 2 NT/RGO composite electrode with 10.00 wt.% GO exhibited a specific capacitance of 27.5 F g −1 at a current density of 0.2 A g −1 in a symmetrical two-electrode cell, whereas the specific capacitance of TiO 2 was 0.7 F g −1 . The Co-doped TiO 2 NT/RGO composite electrode exhibited high rate capability and excellent long-term cycle stability. The outstanding performance of the Co-doped TiO 2 NT/RGO composite electrode was attributed to the synergistic effects on capacitive behavior of Co-doped TiO 2 NT combined with high electronic conductivity of the RGO sheets.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Hang Liu,Hua Yin,Shaoyu Tang,Hui Peng,Xiaolong Yu,Guining Lu,Zhi Dang
In this work, the prepared mesoporous TiO 2 was employed to eliminate the environmental risk induced by the combined pollution (tris-(2-chloroisopropyl) phosphate (TCPP) and Cd 2+ ). The prepared material was characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance spectra (UV-DRS), Raman imaging spectrometer (Raman), N 2 adsorption/desorption isotherm and X-ray photoelectron spectroscopy (XPS). In the combined pollution system, the prepared TiO 2 simultaneously exhibited a higher adsorption and photocatalytic activity for Cd 2+ and TCPP at neutral condition, respectively. The adsorption of Cd 2+ and photo-degradation of TCPP by mesoporous TiO 2 followed pseudo-second-order and pseudo-first-order kinetics model, respectively. The removal efficiency of TCPP was improved from 67% to 100% when the concentration of co-existed Cd 2+ increased from 0.5 mg L −1 to 2 mg L −1 , due to the fact that the adsorbed Cd 2+ on the surface of TiO 2 scavenged electron and thus inhibited the photo-generated electron-hole pairs recombination. In addition, six degradation intermediates were determined by high resolution mass spectrum (HRMS) and potential transformation pathways of TCPP under the co-existence of Cd 2+ were proposed. The results suggested that rapid and high-efficient simultaneous removal of Cd 2+ and TCPP was feasible, which laid the basis for the remediation of other combined pollution in the future.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2018
·
IF 3.609
Yujie Zheng,Bingjie Liu,Pei Cao,Hui Huang,Jing Zhang,Guowei Zhou
In this study, flower-like mesoporous TiO 2 hierarchical spheres (FMTHSs) with ordered stratified structure and TiO 2 nanoparticles (TNPs) were synthesized via a facile solvothermal route and an etching reaction. Multilamellar vesicles (MTSVs) and unilamellar TiO 2 /SiO 2 vesicles (UTSVs) were prepared using cetyltrimethylammonium bromide and didodecyldimethylammonium bromide as structure-directing agents under different solvothermal conditions. FMTHSs and TNPs were obtained from the etching reactions of MTSVs and UTSVs, respectively, in an alkaline system. FMTHSs display flower-like, ordered stratified structures on each petal. The thickness of the ordered stratified structure is approximately 3–6 nm, and the number of layers is approximately 2–4. The FMTHSs2 electrode exhibits the first discharge capacity of 212.4 mA h g −1 at 0.2 C, which is higher than that of TNPs electrode (167.6 mA h g −1 ). The discharge specific capacity of FMTHSs2 electrode after 200 cycles at 1 C is 105.9 mA h g −1 , which is higher than that of TNPs electrode (52.2 mA h g −1 ) after the same number of cycles. The outstanding performance of FMTHSs2 electrode is attributed to the advantages of FMTHSs. In particular, their own stratified structure can provide additional active sites for reactions. The hierarchical structure can provide short diffusion length for Li + , large electrolyte–electrode contact area, and superior accommodation of the strain of Li + intercalation/deintercalation.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2014
·Vol. 20
·期 43
·14012-14017
·
IF 5.696
Meili Yin,Enguo Ju,Zhaowei Chen,Zhenhua Li,Jinsong Ren,Xiaogang Qu
Graphical Better together : Upconverting nanoparticles with a mesoporous TiO 2 shell (MTUNs) have been synthesized for light-triggered drug delivery and synergistic cancer therapy. Cytotoxicity experiments demonstrated that combined therapy mediated the highest rate of death of breast carcinoma cells compared with that of single chemotherapy or photodynamic therapy (see figure; Dox=doxorubicin, HA=hyaluronic acid, Hyal=hyaluronidase). Malignant tumors remain a major health burden throughout the world and effective therapeutic strategies are urgently needed. Herein, we report the synthesis of upconverting nanoparticles with a mesoporous TiO 2 (mTiO 2 ) shell for near-infrared (NIR)-triggered drug delivery and synergistic targeted cancer therapy. The NaGdF 4 :Yb,Tm could convert NIR light to UV light, which activated the mTiO 2 to produce reactive oxygen species for photodynamic therapy (PDT). Due to the large surface area and porous structure, the mTiO 2 shell endowed the nanoplatform with another functionality of anticancer drug loading for chemotherapy. The hyaluronic acid modified on the surface not only promised controlled drug release but also conferred targeted ability of the system toward cluster determinant 44 overexpressed cancer cells. More importantly, cytotoxicity experiments demonstrated that combined therapy mediated the highest rate of death of breast carcinoma cells compared with that of single chemotherapy or PDT.
研究领域:
生物医学工程
·
肿瘤学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 24
·22844-22855
·
IF 2.22
Zhou Xiaojun,Ni Jian,Guan Jiayi,Liu Yue,Yin Junyang,Wang Jinlin,Zhang Yaofang,Li Juan,Cai Hongkun,Zhang Jianjun
Mesoporous TiO 2 (m-TiO 2 ) layer has been widely used as a photoelectrode of solar cells. Compared with conventional planar TiO 2 layer, appropriate pore size dramatically improves infiltration of perovskite (PVK) into the mesoporous layer because of the larger voids formed within the TiO 2 mesoporous layer and further enhances the light absorption efficiency of PVK for the better light-scattering ability of 20 nm TiO 2 nanoparticles. In our study, 75–95 nm pore size of TiO 2 scaffold layer was successfully prepared by adding different contents of ethyl cellulose (EC) as a template and terpineol as a leveling agent into conventional TiO 2 paste composed of 20 nm-sized TiO 2 nanoparticles and then applied to PVK solar cells (PSCs).The novel mesoporous layer was conducive to increase light-harvesting capacity and photovoltaic performance of PSCs. The influence of different contents of EC was discussed systematically for TiO 2 scaffold layer, the charge carrier dynamic, and the hysteresis behavior for our devices. Finally, by optimizing the parameters of the electron transport layer, the power conversion efficiency of the champion device with a 16.5% mass fraction of EC reached as high as 18%.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Jiaxin Li,Dandan Wang,Renquan Guan,Yujun Zhang,Zhao Zhao,Hongju Zhai,Zaicheng Sun
Photocatalysis provides a sustainable route to convert N2 to NH3 with the aid of a photogenerated electron. Beyond the typical issue in the photocatalytic field, NH3 synthesis requires adsorption, activation, and hydrogenation of N2. In this report, Ni-doped TiO2 (Ni-x-TiO2) photocatalysts were fabricated by a simple sol–gel method to introduce the oxygen defects and Ni site on TiO2. The oxygen vacancy (Vo) enhances the adsorption of N2 on the catalyst surface. The Ni doping induced a defect energy level below the conduction band, which prefers to accept the photogenerated electron. The electron captured by Vo tends to transfer to the adsorbed N2 and activate N2. On the other hand, the Ni site is a typical H2 production site. It provides enough H2 for the hydrogenation of N2 to form NH3. To sum up all of these advantages, Ni-doped TiO2 displays a high NH3 production rate of 46.80 μmol·g–1·h–1 which is about 7 times higher than that of pure TiO2. This manuscript provides a potential method to design a highly efficient photocatalyst for the NH3 synthesis.
研究领域:
材料科学
·
催化
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2015
·
IF 2.638
Dezhi Chen,Shasha Chen,Hongying Quan,Zhongning Huang,Lin Lu,Xubiao Luo,Lin Guo
Combining hydrothermal treatment and photocatalytic deposition, W 6+ doping TiO 2 composites modified with Au nanoparticles (Au/W–TiO 2 ) were synthesized successfully. A series of characterization techniques including X-ray diffraction, scanning electron microscopy, transmission electron microscopy and N 2 adsorption indicated that the Au nanoparticles are distributed homogeneously on the W 6+ doping TiO 2 clusters with mesoporous structures. The photocatalytic properties of the Au/W–TiO 2 nanocomposites were evaluated through the photodegradation of organic dye in aqueous solution and characterized in detail by UV–visible diffuse reflectance spectra and PL fluorescence spectra. Compared with the three samples of pristine TiO 2 , W 6+ doping TiO 2 and Au/TiO 2 , the resulting Au/W–TiO 2 nanocomposites exhibited an enhanced photocatalytic performance for degradation of contaminant under simulated solar light and visible light irradiation. Under simulated solar light irradiation (duration: 15 min), 84.6%, 77.8%, 67.8% and 47.6% of organic dye was decomposed by Au/W–TiO 2 , Au/TiO 2 , W–TiO 2 and bare TiO 2 , respectively. Furthermore, the degradation rate of organic dye is 98%, 90%, 76%, and 62% for Au/W–TiO 2 , Au/TiO 2 , W–TiO 2 and pure TiO 2 under visible light irradiation for 90 min, respectively. The enhanced photocatalytic activity is attributed to the synergetic effects of W 6+ doping and Au modification, which can effectively improve the light absorption intensity and, the range, increase the adsorption active sites and reduce the electron–hole pair recombination in TiO 2 .
研究领域:
材料科学
·
环境科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Lijuan Zhang,Si Wang,Zhiqin Yuan,Chao Lu
Development of selective cataluminescence (CTL) sensors toward volatile organic compounds (VOCs) is of great importance to environmental analysis and daily chemicals safety. Although some reports for the determination of VOCs based on CTL have been reported, part of them suffered relatively low selectivity because of their high sensitivity toward interferents. In this study, mesoporous TiO 2 nanoparticles have been exploited to detect diethyl ether with the usage of a 440 nm bandpass filter. The proposed method showed high selectivity toward diethyl ether over other VOCs, such as acetaldehyde, acetone, butanone and butanol, etc. Such a high selectivity was majorly attributed to the difference of CTL emission profiles of various VOCs reaction intermediates, and only diethyl ether exhibited strong CTL emission at about 440 nm. Under the optimal conditions, diethyl ether could be detected ranging from 2.0 to 50.0 mM. Furthermore, the practical application of this proposed CTL sensor for diethyl ether was validated with artificial samples and commercial perfumes. In general, such a simple method with high selective detection through controlling detection range could be extended to other analytes.
研究领域:
环境分析
·
化学安全
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Ke Wang,Xianhe Li,Nan Wang,Quanhao Shen,Maochang Liu,Jiancheng Zhou,Naixu Li
Solar photocatalysis has long relied on the rational design of semiconductor photocatalysts. Herein, a ternary meso-TiO2@ZnIn2S4/Ti3C2 MXene photocatalyst is prepared and demonstrated with a core–shell structure accompanied by few-layered Ti3C2 Mxene on the ZnIn2S4 shell. The success of the synthesis depends on a two-step method consisting of hydrothermal and electrostatic self-assembly procedures. The ternary heterojunction exhibits a good behavior for photocatalytic CO2 reduction. A mechanism study of the photocatalytic reaction indicates that the photogenerated charges transfer in a Z-scheme pathway. Moreover, the construction of the Schottky junction between metallic Ti3C2 and TiO2@ZnIn2S4 is extremely effective for the reduction reaction. Consequently, the photocatalytic rates toward CO and CH4 production are up to 30.5 and 34.0 μmol/g within 3 h of illumination by simulated sunlight, respectively, while the CH4 selectivity reaches 52.7%. This work provides a good strategy to achieve highly efficient photocatalytic CO2 reduction.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Green Processing and Synthesis
·
2022
·Vol. 11
·期 1
·536-544
·
IF 3.97
Ba-Duc Tran,Phuong-Nam Tran,Xuan-Thanh Bui,Duy-Hung Nguyen,Thanh-Tung Duong
In this study, CsPb 1– x
Mn
x
Br 3–2 x
Cl 2 x
( x = 0–0.5) nanoparticles were synthesized directly in toluene solvents at high temperature. This approach results in small-size nanoparticles, which can be used in photoelectric components without adding a filtration process to eliminate high-temperature solvents such as octadecene. The high content Mn 2+ -incorporated CsPb(Cl/Br) 3 host is observed by strongly wideband emission at 592 nm of manganese d-states spin and orbital forbidden transition. After infiltration into mesoporous TiO 2 , the Mn 2+ ion receives energy from the CsPb(Cl/Br) 3 host (irradiated 405 nm light-emitting diode source) and effectively transfers to the TiO 2 scaffold layer. As a result, a metal/semiconductor/metal planar structure photodetector with m-TiO 2 /CsPb 1– x
Mn
x
Br 3–2 x
Cl 2 x
( x = 0–0.5) composite showed several figures of merit compared to bare m-TiO 2 and m-TiO 2 /CsPbBr 3 such as on/off ratio of 10 4 times, responsivity of 1.67 A·W −1 , and detectivity of 4.42 × 10 9 Jones. The key factors contributing to the growth of the on/off ratio include the decreasing dark current and enhancing exciton energy and transportation due to the infiltration of CsPb 1– x
Mn
x
Br 3–2 x
Cl 2 x
( x = 0–0.5) perovskite quantum dots into mesopores of the m-TiO 2 scaffold layer.
研究领域:
材料科学
·
纳米技术
·
光子学
·
半导体器件
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）