RSC Advances
·
2017
·Vol. 7
·期 7
·3949-3957
·
IF 3.108
Enjie Yu,Qilong Zhang,Nuoxin Xu,Hui Yang
In this study, self-assembly flower-like TiO2 (F-TiO2) particles with an average diameter of 400 nm are synthesized via a facile one-pot solvothermal method. P(VDF-HFP)-based composites with F-TiO2 particles of different volume ratio as fillers are prepared. Microstructure and thermal analyses confirm that F-TiO2 does not change the crystallization process of the polymer matrix, but disrupts the crystallization degree of P(VDF-HFP). Dielectric properties measured at various frequencies and temperatures indicate that the addition of the F-TiO2 fillers enhances the dielectric constant of the composites, while the dielectric loss and electric conductivity do not significantly increase. The dielectric permittivity of the polymer nanocomposites is enhanced by 200% over that of the P(VDF-HFP) matrix at a filler content of 20 vol% while maintaining a rather low dielectric loss (0.043 at 1 kHz). Especially, the F-TiO2/P(VDF-HFP) composites exhibit low electric conductivity (≤10−11 S cm−1) at low frequencies. All the improved performances suggest an easy method to fabricate nanocomposites having potential electrical applications.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Gang Jian,Qingzhen Meng,Yong Jiao,Liang Feng,Hui Shao,Fengwei Wang,Fang Meng
Electrophoretic deposition is employed to deposit flower-like TiO 2 (F-TiO 2 ) particles onto stainless steel textiles to obtain a Fe@F-TiO 2 /PDMS hybrid textile as the negative tribo-material. The electrophoresis process enables adjustable deposit amounts and three-dimensional and uniform deposits of flower TiO 2 . The textile triboelectric nanogenerators (tTENGs) fabricated from the Fe@F-TiO 2 /PDMS hybrid textile working in conjunction with cotton and silk exhibit excellent performances. The tTENG generates a voltage of 120 V, a current of 25 μA and an output power of 0.85 W m −2 with the cotton and 110 V, 30 μA and 1.05 W m −2 with the silk. The flower-like TiO 2 is significant for the high performance of the tTENG, being attributed to the tailored surface and improved permittivity. Wearable tTENGs exhibit good durability after 8,000 cycles and power 58 light emitting diodes. By utilizing the worn tTENG, real-time biomechanical energy harvesting is realized; furthermore, a wireless communication via infrared rays is achieved, confirmed by the successfully receiving of the wireless signal and lighting up of the indicator LED. This work demonstrates high-performance hybrid textiles prepared by electrophoretic deposition and tTENGs for applications in wearable real-time energy harvesters and wireless communication units.
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
MATERIALS & DESIGN
·
2016
·
IF 3.997
Yawen Wang,Zunli Mo,Ping Zhang,Chun Zhang,Lijuan Han,Ruibin Guo,Hao Gou,Xiaojiao Wei,Rere Hu
A surfactant-assisted hydrothermal route was developed for the synthesis of three-dimensional (3D) flower-like TiO 2 microsphere decorated graphene composite (FT/GN) based on the hydrothermal reduction of graphene oxide and formation of TiO 2 microsphere in the presence of poly(vinyl pyrrolidone) (PVP). By several characterization methods such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, we demonstrated that uniform flower-like TiO 2 (FT) microsphere with average diameter of 1.4 μm have successfully anchored on the surface of graphene sheets . Effects of PVP and reaction temperature on the microstructure of the composite were investigated. Benefits from the combined graphene with FT microsphere were that the FT/GN composite exhibited higher adsorption capacity and photocatalytic activity for the removal of rhodamin B (RhB) than blank FT microsphere and P25. Especially, the removal rate of RhB using FT/8GN composite under UV light irradiation reached 99.2% in 80 min, with corresponding TOC removal efficiency of 66.49%. Moreover, the recycled photoactivity tests showed that the prepared composite were stable enough and maintained high removal efficiency for RhB even after four cycles. It is expected that the present synthetic strategy may provide a new strategy for the fabrication of various GN-based hybrids with multi-dimensional structure.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhen Hu,Li Zhao,Wenlu Li,Shimin Wang,Binghai Dong
A composite film was prepared by mixing NaLuF 4 :Yb 3+ /Er 3+ up-conversion luminescent material with commercial P25, and a scattering layer composed of flower-like TiO 2 was added on to the composite film (UC/P25) to form a double-layer composite film (UC/P25 + FT). An AgNO 3 solution was irradiated by ultraviolet light to deposit nano-Ag particles on the prepared double-layer film, and a nano-Ag modified double-layer film (UC/P25 + FT + Ag) was finally obtained. The synergistic effect of the three improved methods conferred the UC/P25 + FT + Ag film with a wide spectral absorption range, strong light-scattering ability, and strong light absorption capability, which greatly improved the photoelectric performance of the film. The maximum photoelectron conversion efficiency of dye-sensitized solar cells with the UC/P25 + FT + Ag photoanode reached up to 8.14%, which increased by 32.36% compared with that of the pure P25 film photoelectrode .
研究领域:
材料科学
·
光电子学
·
能源科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Zhao-huan Zhang,Junjie Hu,Han Zhu,Qiang Chen,Kwangnak Koh,Hongxia Chen,Xiao-hui Xu
Alzheimer’s disease (AD) is one of the most prevalent neurodegenerative disease. Plasma total phosphorylated tau (P-tau) with multi-phosphorylation sites is a potentially efficient biomarker for the diagnosis and prognosis of AD. Single phosphorylation site recognition methods lead to the false positive detection of P-tau and decrease the accuracy of AD analysis. In this work, a simple and precise electrochemical immunoassay was developed for the specific detection of P-tau. Calixarene derivative ProLinker was utilized to orient Anti-tau onto the surface of gold electrode. ProLinker provide abundant binding sites for immobilized antibodies via host-guest recognitions and ensure Anti-tau activity through non-covalent interactions. Flower-shaped TiO 2 (F-TiO 2 ) forming coordination bonds with the phosphate group of phosphorylated protein were utilized as signal amplification tags to construct a simple sandwich assay for multiple phosphorylated sites sensing of P-tau. The combination of F-TiO 2 and Anti-tau ensured the bispecific and precise recognition of P-tau with a wide detection range (1–200 ng/mL) and a low detection of limit (1.774 pg/mL). With large specific surface area, high electron hinder ability, and great stability, F-TiO 2 as an amplification molecule can improve the performance of the immunosensor and produce sensitive signal changes according to the concentration of P-tau in the clinical samples. Hence, this P-tau immunoassay paves the way for the development of efficient detection tools for clinical diagnosis and monitoring.
研究领域:
生物医学工程
·
神经科学
·
诊断学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 26
·14160-14170
·
IF 6.895
Gang Jian,Qingzhen Meng,Yong Jiao,Fang Meng,Yanpeng Cao,Mingfang Wu
In this study, a flower-like TiO2 filled polymethyl methacrylate (PMMA) composite is presented as a positive tribo-material to produce an excellent-performance triboelectric nanogenerator (TENG). By working in conjunction with polydimethylsiloxane (PDMS), the flat-surface PDMS/PMMA-flower TiO2 TENG generates a voltage of 1200 V, a current of 139 mA m−2 and an output power of 34.85 W m−2, showing significant enhancement compared with its counterpart utilizing neat PMMA as the positive tribo-material under the same operating conditions, whose voltage is 620 V, current is 78 mA m−2 and output power is 13.89 W m−2, respectively. The performance of the TENG is highly dependent on filler loadings of TiO2 flower particles in PMMA composites with an optimal filler loading of 40 wt% with the highest performances. The flower TiO2 is vital to the enhanced performances of the TENG, which is due to the modified surface, the tailored dielectric constant and the space charge polarization. The TENG is capable of powering 600 light emitting diodes, a calculator and a digit display, and applied in self-powered electrophoretic deposition of oxide films. This work demonstrates a facile, low-cost approach for obtaining high-performance TENGs utilizing a PMMA-flower TiO2 composite as the positive tribo-material for applications in sustainable power systems.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Baichuan Zhao,Huihui Liu,Lingzhi Xia,Zhi Wang,Congyun Zhang
The development of powerful technologies to simultaneously monitor and eliminate toxic organic pollutants is a vital focus of environmental research. For this purpose, a recyclable surface-enhanced Raman scattering (SERS) substrate was successfully prepared by successively depositing gold nanoparticles (AuNPs) and a reduced graphene oxide (rGO) film on TiO2 microflower particles by two-step in situ reduction processes. The prepared TiO2@Au-rGO ternary composites exhibit not only good SERS performance via molecule enrichment of rGO and surface plasmon resonance (SPR) capability, but also enhanced photocatalytic degradation activity because of the increased broadband UV–visible-light-harvesting efficiency and SPR-enhanced charge transfer. The detection limit of rhodamine 6G (R6G) as low as 10–11 M and excellent reproducibility were achieved. Additionally, the TiO2@Au-rGO ternary composites yield complete removal of R6G within 15 min under broadband UV–visible light illumination, wherein their apparent reaction-rate constant is 2.8 and 5.5 times larger than those of binary TiO2@Au and pure TiO2, respectively. Meanwhile, no distinct SERS and photocatalytic activity loss were observed even after five reusability tests, achieving the recycling SERS application by photocatalytic degradation. Most importantly, the as-fabricated ternary samples can be explored for the efficient capture, sensitive detection, and self-cleaning degradation of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47), revealing great potential applications in the SERS-based simultaneous monitoring and removal of trace aromatic persistent organic pollutants.
研究领域:
环境科学
·
材料科学
·
分析化学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）