Analytical Methods
·
2015
·Vol. 7
·期 4
·1328-1332
·
IF 1.821
Xiaoyan Yang,Jingyu Li,Junliang Fu
In this article, a label-free photoelectrochemical immunosensor based on a CdS-modified mesoporous TiO2 film has been developed. The CdS quantum dots could be deposited onto the mesoporous TiO2 film by electrochemical deposition, which could enhance the photocurrent intensity in the visible region. Employing specific binding of antigen–antibody, α-fetoprotein (AFP) could be captured on the surface of the modified electrode. Based on the steric hindrances, the photocurrent intensity decreased with the increase in AFP concentration. A linear response from 0.05 ng mL−1 to 20 ng mL−1 was obtained for AFP detection and the detection limit was 0.02 ng mL−1. Moreover, the practical determination of AFP in human serum was also investigated.
研究领域:
分析化学
·
生物传感器
·
纳米技术
·
医学诊断
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Haixin Zhao,Shu Cui,Guodong Li,Nan Li,Xiaotian Li
Recently, photocatalysts with a hollow mesoporous structure have drawn increasing interest owing to their extensive application in environmental protection. Herein, we prepared hollow mesoporous TiO 2 nanospheres decorated with few layer 1T- and 2H- mixed phase MoS 2 nanosheets via a template-based method and a hydrothermal reaction. The as-synthesized samples are of hollow mesoporous structure and high specific surface area, providing abundant mass transport and active sites for photocatalytic reaction. 1T-MoS 2 in the mixed phase MoS 2 mainly play the role as a bridge that transfers photoexcited electrons. Besides, the heterojunction between MoS 2 and TiO 2 can also efficiently restrain the recombination of photogenerated charge carriers in photocatalysts. As a consequence, under UV–vis light irradiation, the hollow porous TiO 2 /MoS 2 presents a remarkable photocatalytic activity in rhodaming B degradation. Scavenger studies demonstrate that the primary active species in photocatalytic process are hydroxyl radicals. Moreover, a possible photocatalytic reaction mechanism has also been put forward.
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
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
W.W. Yan,Y.F. Yuan,J.Y. Xiang,Y. Wu,T.Y. Zhang,S.M. Yin,S.Y. Guo
Triple-layered sandwich nanotubes of carbon@mesoporous TiO 2 nanocrystalline@carbon were prepared through coating hydrous titania and resorcinol-formaldehyde resin on carbon nanotubes followed by controllable crystallization and carbonization . Material characterization indicated that TiO 2 nanocrystalline with the size of 5–6 nm was uniformly assembled to the mesoporous sandwich layer of carbon nanotube-in-nanotube, leading to large specific surface area of 465.4 m 2 g −1 and large pore volume of 0.695 ml g −1 . As anode material for lithium ion batteries , triple-layered sandwich nanotubes exhibited high lithium storage capacity (244 mAh g −1 at 0.1C), good rate capability (115 mAh g −1 at 5C), and excellent cycling stability (191 mAh g −1 with coulombic efficiency of 100.2% was retained after 200 cycles at 0.2C, presenting 79% of capacity retention ratio). The superior lithium storage properties should be attributed to synergistic superiorities of TiO 2 nanocrystalline, the mesoporous sandwich layer structure and carbon nanotube-in-nanotube. These unique structural characteristics effectively reduce Li + diffusion length; enhances intercalation storage capability and pseudocapacitive interfacial storage capability of TiO 2 ; provides sufficient space to accommodate volume variation of TiO 2 nanocrystalline; increases electron conductivity and structure stability of TiO 2 . It is anticipated that the present triple-layered sandwich nanotube provides a unique carbon-based hybrid structure for other energy storage materials.
研究领域:
材料科学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
Energy Technology
·
2020
·Vol. 9
·期 2
·2000957
·
IF 3.404
Bo Li,Jianhong Zhao,Qingjie Lu,Shiqiang Zhou,Haitang Wei,Tianping Lv,Yumin Zhang,Jin Zhang,Qingju Liu
Applying metal–organic framework (MOF) materials to perovskite solar cells (PSCs) is an innovative and promising direction in the current photovoltaic field, especially in low-cost carbon-based PSCs without hole transport layer. Herein, a novel mesoporous anatase TiO 2 nanocrystalline with pie morphology, large specific surface area (SSA), and outstanding wettability is successfully prepared by sintering the NH 2 -MIL-125 at 500 °C for 6 h. The TiO 2 derived from NH 2 -MIL-125 possesses excellent penetration and crystallinity of perovskite in the electron transporting layer (ETL), and exhibits appropriate work function which matches relatively better with the conduction band of perovskite. Meanwhile, the power conversion efficiencies (PCEs) of the two PSC devices based on the as-prepared TiO 2 are 13.49% and 12.55%, respectively. Moreover, both of these devices exhibit good stability.
研究领域:
光伏技术
·
材料科学
·
太阳能
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2016
·
IF 4.732
Xian Hou,Tongtong Xuan,Hengchao Sun,Xiaohong Chen,Huili Li,Likun Pan
ZnGa 2 O 4 :Eu 3+ nanophosphor was synthesized through a hydrothermal method and used as an effective light down-shifting/converting material in mesoporous TiO 2 layer of perovskite solar cells (PSCs). The nanophosphor can convert the high energy incident photon into the photon(s) with lower energy, which can excite CH 3 NH 3 PbI 3 to generate more photo generated electron–hole pairs, and thus promote the incident light use ratio and increase the power conversion efficiency (PCE) of PSCs. After the incorporation of suitable amount of ZnGa 2 O 4 :Eu 3+ into PSCs, the cell PCE is increased to 13.80% with a photocurrent density of 23.68 mA cm − 2 and a highest PCE of 14.34% with a photocurrent density of 25.02 mA cm −2 is achieved, much higher than those of the cell without ZnGa 2 O 4 :Eu 3+ (PCE of 10.67% and photocurrent density of 20.2 mA cm −2 ). The enhanced photovoltaic performance by incorporating the nanophosphor into PSCs should be ascribed to the increased incident light use ratio and improved exciton generation rate.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Shuqing Xiang,Mingqian Wang,Li Li,Jian Shen
The gas therapy of some endogenous signaling molecules to treat diseases has caused extensive research, among which NO gas has shown great potential in fighting infection with various pathogens, promoting wound healing, etc. Here, we propose a photothermal/photodynamic/NO synergistic antibacterial nanoplatform by loading L -arginine (LA) on mesoporous TiO 2 and then encapsulating it with polydopamine . The obtained TiO 2−x [email protected] nanocomposite possesses both the excellent photothermal effect and ROS generation ability of mesoporous TiO 2 , and the release of nitric oxide (NO) from L -arginine under near-infrared (NIR) light irradiation , while the sealing layer of PDA could induce NIR-triggered NO controlled release. In vitro antibacterial experiments confirmed that the synergistic effect of TiO 2−x [email protected] nanocomposites has excellent antibacterial effects against Gram-negative and Gram-positive bacteria, while in vivo experiments showed that it has lower toxicity. It is worth noting that compared with the pure photothermal effect and ROS, the generated NO showed a better bactericidal effect , and NO had a better ability to promote wound healing. In conclusion, the developed TiO 2−x [email protected] nanoplatform can be used as a nanoantibacterial agent, which can be further explored in the related biomedical field of photothermal activation of multimodal combined antibacterial therapy.
研究领域:
纳米技术
·
生物医学工程
·
药学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2024
·Vol. 137
·期 3
·1535-1552
·
IF 1.7
Feng Shangzhen,Zhou Hantao,Jiang Huanjin,Yang Jie,Chen Jixiang
Herein, the Ni–Co alloy supported on TiO 2 catalysts were prepared by sol–gel method assisted with Polymethyl Methacrylate (PMMA) template, and they were tested for in situ aqueous phase hydrodeoxygenation (HDO) of methyl palmitate to hydrocarbons using methanol as hydrogen donor. It has been found that the introduction of PMMA decreases the Ni–Co alloy particles size, reduces the metal-support interactions (SMSI), constructs the mesopores and enlarges the mesopore size. Also, the Ni–Co alloy particles can be partially embedded in TiO 2 , beneficial to the catalyst stability since the sintering and leaching of the Ni–Co alloy particles can be suppressed under hydrothermal condition. In the in situ HDO of methyl palmitate, the main deoxygenation pathway is decarboxylation/decarbonylation on the Ni–Co alloy catalysts. The catalysts prepared with PMMA exhibits higher activity than that without PMMA, giving the pentadecane yield of 86.2% at 310 °C. This is ascribed to their more exposed active sites and wider mesopores. Moreover, the catalyst is not obviously deactivated during five reactions.
研究领域:
催化
·
化学工程
·
材料科学
·
环境科学
·
有机化学
✓ 已验证
DOI
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Ye Zhu,Zhixuan Cheng,Qun Xiang,Xikun Chen,Jiaqiang Xu
Mesoporous TiO 2 -SiO 2 functionalized with p-hexa-fluoroisopropanol aniline (HFIP) was designed and synthesized to achieve highly sensitive and selective sensing toward nerve agent simulant dimethyl methylphosphonate (DMMP) due to a hydrogen bonding between target DMMP and TiO 2 -SiO 2 -HFIP. The sensing experiments were conducted by coating compounds onto quartz crystal microbalance (QCM) transducers. It was found that the observed frequency shifts gradually and turned saturated in the range from 10 to 60 ppm. Gas sensing test results revealed that sensors had enhanced sensitivity due to the decoration of HFIP on TiO 2 -SiO 2 in a ppb level. Furthermore, when the doping of HFIP reached 20 wt%, the sensors achieved the best sensing performance. In conclusion, the QCM sensor coated with mesoporous TiO 2 -SiO 2 -HFIP exhibited fast response, excellent reversibility and high selectivity to nerve agent stimulant DMMP vapor, implying that mesoporous TiO 2 -SiO 2 -HFIP may be a good candidate for sensing DMMP.
研究领域:
材料科学
·
化学传感
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 40
·2202981
·
IF 15.153
Minrong Guan,Yongxin Huang,Qianqian Meng,Botao Zhang,Nuo Chen,Li Li,Feng Wu,Renjie Chen
The next generation of high-energy-density storage devices is expected to be rechargeable lithium metal batteries. However, unstable metal-electrolyte interfaces, dendrite growth, and volume expansion will compromise lithium metal batteries (LMB) safety and life. A simple drop-casting method is used to create a double-layer functional interface composed of inorganic mesoporous TiO 2 and F-rich organics PFDMA. For high-quality lithium deposition, TiO 2 can provide uniform mechanical pressure, abundant mesoporous channels, and increased ionic conductivity, while PFDMA provides enough F to form LiF in the first cycle and improves Li-electrolyte compatibility. Experiments and simulations are combined to investigate the optimized mechanism of the LiF-rich solid electrolyte interface (SEI). The high binding energy of organic matter and Li demonstrates that Li + preferentially binds with the F atom in organic matter. As a result, the tightly bound double-layer structure can inhibit lithium dendrite growth and slow electrolyte decomposition. Consequently, the symmetric Li||Li cell has a high stability performance of over 800 h. The assembled LiFePO 4 ||Li cell can sustain 300 cycles at a 1 C rate and has a reversible capacity of 136.7 mAh g −1 .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Donghui Kou,Tan Shi,Lei Li,Shufen Zhang,Wei Ma
Water is closely linked with our life and pH monitoring is of great significance to biochemistry, environment and industry. Herein, utilizing a controllable post-hydrolysis modification strategy, multilayered photonic crystal based pH sensors consist of mesoporous TiO 2 and partially hydrolyzed poly(acrylamide- N,N’ -methylene bis(acrylamide)) (P(AM-MBA)) layers are proposed. Varying pH from 4.0 to 8.5, the portable sensor transforms its color from violet to red with a linearly increased wavelength of 199 nm as the stopband generates ∼7 nm shift per 0.1 pH unit. The sensor exhibits repeatable response to pH change with a short sensing time of 0.8 s. Through goal-directed molecular regulations by the post-hydrolysis strategy, innovative dot-matrix sensor arrays with multiple sensing elements are created and present distinct color difference maps under diverse pH circumstances. And color based radar maps and PCA analysis greatly promote the detection accuracy and reliability. The dot-matrix sensors provide convenience for color-blind crowd and are applicable for use in human perspirations, suggesting promising potential in clinical applications. Furthermore, quartz crystal microbalance studies reveal the effect of the molecular regulation involving functional group and segment structure modifications on the sensing performance of the polymer based photonic materials, showcasing high reference values for future polymer-related researches.
研究领域:
生物化学
·
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Kanghong Wang,Yi Tao,Zikun Tang,Daniele Benetti,François Vidal,Haiguang Zhao,Federico Rosei,Xuhui Sun
Colloidal Quantum dots (QDs) are considered promising light harvesters for photoelectrochemical (PEC) hydrogen generation devices due to their size tunable optoelectronic properties. However, the solar-to-hydrogen (STH) efficiency and long-term stability of devices based on QDs are still relatively low, thus limiting the commercial development. These limitations are attributed to the limited absorption range of QDs, unfavorable band energy alignment and photo-oxidation. Here we propose and realize two core/multiple-shell architecture based on CdSe/CdS/ZnS QDs. The shell composition is optimized with gradient layers, forming CdSe/CdSe x S 1−x /CdS/Zn y Cd 1−y S/ZnS core/multiple-shell structures, which reduces the surface traps and defects of QDs and simultaneously suppresses exciton recombination by providing intermediated alloyed interlayers . The PEC device based on a mesoporous TiO 2 sensitized with two types of core/multiple-shell QDs exhibited an outstanding saturated photocurrent density of 20.5 mA/cm 2 for alloyed core/multiple-shell QDs, under one sun illumination (AM 1.5 G, 100 mW/cm 2 ). To our knowledge, this is comparable to the highest value reported so far for the PEC devices based on colloidal QDs. In addition, the as-prepared PEC devices exhibited excellent stability, maintaining ~93.4 % of the initial photocurrent density after 2-hour continuous illumination (100 mW/cm 2 ). This work provides an efficient approach for improving the performance of PEC devices through QDs structure engineering.
研究领域:
材料科学
·
纳米技术
·
光电化学
·
可再生能源
✓ 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）