SENSORS AND ACTUATORS B-CHEMICAL
·
2012
·
IF 3.898
Xianfeng Wang,Fuhai Cui,Jinyou Lin,Bin Ding,Jianyong Yu,Salem S. Al-Deyab
This paper describes the detection of formaldehyde through analyses of the resonance frequency signal from quartz crystal microbalance (QCM) sensors coated with a novel organic–inorganic hybrid sensing coating. Nanoporous titanium dioxide (TiO 2 ) fibers with high Brunauer–Emmett–Teller (BET) surface area (68.72 m 2 /g) were fabricated by electrospinning a sol–gel titanium tetraisopropoxide (TIP)/polystyrene (PS) composite solution and following calcination process. Ethylene glycol (EG) dispersed TiO 2 nanofibers were drop casted onto the electrode of QCM, followed by the functionalization of the sensing polyethyleneimine (PEI) on the fibers. The nanoporous TiO 2 fibers covered with PEI layers worked as a highly sensitive sensing interface to provide output signal for weight changes during exposure to formaldehyde vapor. The developed formaldehyde-selective sensors exhibited rapid response and low detection limit (1 ppm) at room temperature . This is because the high specific surface area of the electrospun nanoporous TiO 2 fibers and efficient nucleophilic addition reaction between formaldehyde molecules and primary amine groups of PEI. Our new synthetic methodology promises to be a powerful approach to fabricating hybrid organic–inorganic nanostructures on QCM for gas sensing and chemical analysis.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2011
·Vol. 13
·期 12
·6661-6672
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IF 3.253
Zhou Qiang,Fu Ming-Lai,Yuan Bao-Ling,Cui Hao-Jie,Shi Jian-Wen
The semiconductor quantum dots (QDs) can be very efficient to tune the response of photocatalyst of TiO 2 to visible light. In this study, CdS QDs formed in situ with about 8 nm have been successfully deposited onto the surfaces of TiO 2 nanotubes (TNTs) to form TNTs/CdS QDs nanocomposites by use of a simple bifunctional organic linker, thiolactic acid. The diffuse reflectance spectroscopy (DRS) spectra of as prepared samples showed that the absorption edge of the TNTs/CdS composite is extended to visible range, with absorption edge at 530 nm. The photocatalytic activity and stability of TNTs/CdS were also evaluated for the photodegradation of rhodamine B. The results showed that when TNTs/CdS QDs was used, photocatalytic degradation of RhB under visible light irradiation reached 91.6%, higher than 45.4 and 30.5% for P25 and TNTs, respectively. This study indicated that the TNTs/CdS QDs nanocomposites were superior catalysts for photodegradation under visible light irradiation compared with TNTs and P25 samples, which may find wide application as a powerful photocatalyst in environmental field.
研究领域:
材料科学
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环境化学
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纳米技术
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光催化
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表面工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2016
·
IF 3.15
Hongqing Gao,Peng Zhang,Junhua Hu,Jimin Pan,Jiajie Fan,Guosheng Shao
One-dimensional Z-scheme TiO 2 /WO 3 /Pt heterostructures were fabricated by integrating a facile electrospinning technique and subsequent annealing in air. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and UV–vis diffuse reflectance spectroscopy, were used to characterize the as-fabricated samples. The results showed that the H 2 -generation of the as-fabricated one-dimensional Z-scheme TiO 2 /WO 3 /Pt heterostructures (S2) was greatly enhanced compared with pure TiO 2 nanofibers (S0) and TiO 2 /WO 3 nanofibers (S1). The enhanced photocatalyst activities were mainly attributed to the solid-state Z-scheme photosynthetic heterojunction system with Pt nanoparticle as an electron collector and WO 3 as a hole collector, leading to effective charge separation on these semiconductors, which were evidenced by electrochemical impedance spectroscopy (EIS) and photocurrent analysis.
研究领域:
材料科学
·
能源化学
·
光催化
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Naijian Hu,Min Chen,Jia Yang,Jianwen Chen,Xinmei Yu,Wenbo Zhu,Ting Wang,Xiucai Wang
Triboelectric nanogenerators (TENGs) have received much attention as cost-effective and friendly energy-harvesting devices that effectively convert mechanical energy from the environment into electrical energy. In this study, a naturally degradable TENG was papered based on TiO2/CMC, which is a cellulose derivative with ease of degradation, good biocompatibility, and low cost. By doping TiO2 nanoparticles, the open circuit voltage, short circuit current, and transfer charge were significantly improved compared to the TENG-based pure CMC film because of the increased dielectric constant, and the corresponding values of 121 V, 6.7 μA, and 20.5 nC were obtained at a doping concentration of 8 wt %. Then, the manufactured triboelectric nanogenerator (MT-TENG) was successful in lighting up LED lights and powering commercial calculators. Moreover, the MT-TENG was used to collect human mechanical energy, which confirms its potential applications. This study provides a feasible path for the research of TENGs based on biomass materials.
研究领域:
材料科学
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能源技术
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生物医学工程
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 4
·717-723
·
IF 1.797
Duan Yinli,Ma Jing,Liu Jiao,Qiang Liangsheng,Xue Juanqin
In this paper, a facile and efficient method was performed to prepare the thermo-responsive Poly(N-isopropylacrylamide)/TiO 2 (TiO 2 /PNIPAM) with the dispersing of TiO 2 nanoparticles into PNIPAM. The structures of nanoparticles and the grafted polymer were confirmed by X-ray diffraction (XRD), Raman spectra, Fourier transform infrared spectra (FT-IR) and Dynamic Light Scattering (DLS). The interactions between the two components were studied by X-ray photoelectron spectroscopy (XPS), and the morphology of TiO 2 /PNIPAM was observed by scanning electron microscopy (SEM). The results showed that TiO 2 exhibited homogeneous dispersion, without sacrificing the properties of TiO 2 . Furthermore, The composite was used to photocatalytic degradation of Methylene blue (MB). The highest MB removal efficiency is 86.3 %. The photocatalytic activities above or below the lower critical solution temperature (LCST) of PNIPAM was also investigated. The experiment results show that the existence of PNIPAM contributed not only the thermo-responsive abilities to TiO 2 , but also the enhanced photocatalytic activities to TiO 2 . In addition, the corresponding mechanism of enhanced photocatalytic activity was proposed. The results manifest that the well-designed TiO 2 /PNIPAM is a promising candidate in wastewater treatment application.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 3
·447-452
·
IF 1.063
He Yilei,Zhang Xing,Wei Yanze,Chen Xiaoyu,Wang Zumin,Yu Ranbo
Nanostructured N-doped TiO 2 photocatalyst has been prepared via a new approach from Ti-based MOF[NH 2 -MIL-125(Ti)] precursor. The success of N doping enhances light absorption and narrows the bandgap. Moreover, the as-prepared nanostructure is constructed with tiny nanoparticles and resembles a pie-like morphology inherited from the MOF, which accelerates electron transfer. Hence, as a photocatalyst for the degradation of methylene blue(MB) under visible light irradiation, the N-doped TiO 2 (N-TiO 2 ) nanostructure shows higher photocatalytic activity with a reaction rate constant of 0.018 min −1 than that of the TiO 2 -P25 and TiO 2 under the visible light.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Yumei Peng,Lixia Qin,Jiefei Liu,Shi-Zhao Kang,Guodong Li,Xiangqing Li
Here, by a simple one-step in situ chemical reduction method, the Ag x Cu y alloy was tailored on the surface of mesoporous TiO 2 (M-TiO 2 ), therefore, a series of bi-functional mesoporous TiO 2 nanohybrids (M-TiO 2 /Ag x Cu y ) for both surface enhanced Raman scattering (SERS) detection and photocatalytic degradation of ampicillin (AMP) were achieved. The composition and structure of the nanohybrids were well characterized using XRD, TEM, XPS and HRTEM-EDS measurements. Results indicated that Ag x Cu y alloy was mainly attached around the pores of M-TiO 2 which may generate more active sites than nonporous P25−Ag−Cu. Thus, the M-TiO 2 /Ag x Cu y nanohybrids could be used as efficient SERS substrates to sensitively monitor the AMP in water with lower detection limit (˜ 1 ppt) than P25−Ag−Cu. Besides, the M-TiO 2 /Ag 3 Cu 1 nanohybrid also showed higher photocatalytic activities for the degradation of AMP under UV irradiation over the M-TiO 2 /Ag, the M-TiO 2 /Cu and the P25−Ag−Cu. This work provided a simple and effective approach to synthesize bi-functional nanohybrids for detection and degradation of organic contaminants in wastewater.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Xin Li,Xiang Chen,Hao Niu,Xiao Han,Ting Zhang,Jiuyu Liu,Huiming Lin,Fengyu Qu
In this paper, CdS/TiO 2 heteronanofibers have been prepared for the photocatalysis toward organic dyes under visible irradiation. Firstly, the one dimensional (1D) TiO 2 porous nanofibers (50–100) nm in diameter and several micrometers in length were synthesized by electrospinning and then CdS nanopaticles (50–100 nm in size) successfully grown onto TiO 2 fibers to form the heterostructure . These CdS/TiO 2 heteronanofibers were adopted as photocatalyst and the photocatalsis processes were analyzed in detail, showing the enhanced visible photodecomposition and good recycle ability. Furthermore, the degradation kinetics was further investigated by varying the amount of CdS. The increase of CdS component may enhance the degradation rate under visible light , but the total degradation efficiency also is affected by the adsorption capacity of catalyst toward the dyes. With the improved visible light degradation performance, these CdS/TiO 2 heteronanofibers would be expected to be used in water purification .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Jiabai Cai,Xueqing Wu,Yuehai Li,Ye Lin,Hui Yang,Shunxing Li
The goal of this work was to assess the performance of Pt nanoparticles (NPs) as co-catalysts on the photocatalytic activity of TiO 2 @Pt@C 3 N 4 hollow spheres, which was tested by photodegrading rhodamine B and methyl blue under visible light irradiation. TiO 2 @Pt@C 3 N 4 composites were fabricated by using modified polystyrene balls as templates, hydrothermal reactions , and calcination . Under simulated sunlight irradiation, photocatalytic activity was in the following of TiO 2 @Pt@C 3 N 4 > TiO 2 @C 3 N 4 > C 3 N 4 > P25. The photo-conversion rate of the TiO 2 @Pt@C 3 N 4 increased significantly relative to TiO 2 @C 3 N 4 and the others. The combination of TiO 2 and C 3 N 4 , as well as the sandwiched of Pt NPs reduce electron-hole recombination as a result of having an electron trap site, which can store and shuttle photo-generated electrons, and enhance photo-generation of active radicals. Electron paramagnetic resonance (EPR) spectroscopy, as well as photo-luminescence (PL), and electrochemical measurements were taken to verify this conclusion. Considering the multi-functional combination of precious metals and semiconductor materials , this work may provide new ideas for the design of high-performance catalysts.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2017
·Vol. 75
·期 2
·623-635
·
IF 1.43
Zhang Qing,Li Deling,Zhang Hongxia,Su Guixian,Li Guanghui
Poly(lactic acid)/sesbania gum/nano-TiO 2 composites were prepared by melt blending in the mixing chamber of a torque rheometer in this work. The processing rheological properties, mechanical properties, morphologies, thermal properties, and optical properties of the resulting composites were evaluated. Effects of nano-TiO 2 content and plasticizer content on the processing rheological properties and mechanical properties of composites were discussed. Scanning electron microscopy micrographs clearly revealed good dispersion of nano-TiO 2 aggregates in the matrix at the low nano-TiO 2 content, while higher content contributed to easy aggregation within the matrix, which was consistent with the results of mechanical properties, thermal properties, and optical properties. As for the processing rheological properties, a reasonable choice of nano-TiO 2 and plasticizer content should be made depending on the used processing equipment and process.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Wei Xu,Tao Wang,Ye Yu,Sheng Wang
Core-shell composites of TiO 2 nanospheres equipped with MoS 2 nanosheets (TiO 2 @MoS 2 ) were synthesized in the presence of cetyltrimethylammonium bromide through a facile hydrothermal method , which was followed by annealing process in an atmosphere of 2% H 2 balanced by Ar. The TiO 2 @MoS 2 composites exhibited higher electrochemical performance than pure MoS 2 nanosheets, and showed a reversible capacity of 467 mAh g −1 at 100 mA g −1 after 80 cycles with highly stable capacity retention. This good performance may be attributed to the dispersed MoS 2 layer, which accelerates the surface electrochemical reactions and offers a stable structure, and the TiO 2 sphere, which serves as a stabilizer to retain the MoS 2 structure upon prolonged cycling. The core-shell composites can be a promising candidate for use in lithium-ion batteries.
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
Journal of Central South University
·
2014
·Vol. 21
·期 5
·1714-1718
·
IF 0.464
Tang Yi-ping,Wang Shi-ming,Tan Xiao-xu,Hou Guang-ya,Zheng Guo-qu
A simple strategy to prepare a hybrid of nanocomposites of anatase TiO 2 /graphene nanosheets (GNS) as anode materials for lithium-ion batteries was reported. The morphology and crystal structure were studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The electrochemical performance was evaluated by galvanostatic charge-discharge tests and alternating current (AC) impedance spectroscopy. The results show that the TiO 2 /GNS electrode exhibit higher electrochemical performance than that of TiO 2 electrode regardless of the rate. Even at 500 mA/g, the capacity of TiO 2 /GNS is 120.3 mAh/g, which is higher than that of TiO 2 61.6 mAh/g. The high performance is attributed to the addition of graphene to improve electrical conductivity and reduce polarization.
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
危险品化学品经营许可证（带存储）