CHINESE CHEMICAL LETTERS
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2018
·
IF 2.631
Jun Chen,Jing Zhan,Yumeng Zhang,Yiwei Tang
A novel ZnCo 2 O 4 /Bi 2 O 3 heterojunction photocatalyst was prepared, and the formation of the heterojunction was confirmed via HRTEM . Photocatalytic activity of as-prepared samples was evaluated through photodegradation of malachite green (MG). The degradation results show that the as-prepared 13% ZnCo 2 O 4 /Bi 2 O 3 heterojunction photocatalyst exhibits higher activity than pure Bi 2 O 3 . The MG degradation rate for the as-prepared catalyst is as high as 94%. The enhanced photocatalytic activity is mainly attributed to the broad photoabsorption and low recombination rate of photogenerated electron-hole pairs, which is driven by the photogenerated potential difference formed at the ZnCo 2 O 4 /Bi 2 O 3 heterojunction interface.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 20
·17931-17938
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IF 2.324
Lu Zuizhi,Zhang Xiaoshan,Huang Meixin,Wen Lingling,Wang Huan,Huang Tianjiao,Zhou Liya
A series of pure Mn 4+ -doped red Sr 2 YNbO 6 (SYN) phosphors were synthesized through the solid-state reaction method. The crystal structure, composition, luminescence properties, and thermal stability of the phosphors were determined through X-ray powder diffraction analysis, scanning electron microscopy, energy-dispersive X-ray spectrometry, and photoluminescence excitation (PLE) spectrometry. The photoluminescence decay curve and temperature-dependent photoluminscence spectra of the phosphors were also obtained. A broad absorption band at 200–550 nm is present in the UV–Vis spectra of the phosphors. Moreover, the PLE spectra of the phosphors present two broad excitation bands at 255–420 and 460–540 nm. These results illustrate that the SYN:Mn 4+ phosphors are suitable for application in UV chips. The phosphor emits red light (675 nm) under excitation with 310 nm light. Crystal field analysis indicates that only the Mn 4+ luminescent center is present in the phosphors. The calculated activation energy of the phosphors is 0.381 eV. This result proves that the phosphors possess good thermal stability. The chromaticity coordinates of the phosphors (0.699, 0.302) are close to the standard values set by the National TV Standards Committee (0.666, 0.333). All analytical results show that SYN:Mn 4+ phosphors have considerable potential applications in white-light-emitting diodes.
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SOLAR ENERGY
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2018
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IF 4.374
Xinzhi Wang,Yurong He,Yanwei Hu,Guangri Jin,Baocheng Jiang,Yimin Huang
Photocatalytic semiconductors have attracted much attention due to their effective harvesting of solar energy for chemical synthesis and wastewater treatment. In particular, 3D hierarchical CuS materials exhibit unique photocatalytic performance due to their distinctive optical properties and high specific surface areas. In the present work, a facile and template-free solvothermal method was applied to the synthesis of monodispersed and homogeneous 3D flower-like CuS superparticles. The prepared superparticles exhibit good photocatalytic properties for degrading organic pollutants (methylene blue) in water. Furthermore, the effect of photothermal conversion in enhancing the photocatalytic activity of this flower-like material was studied; this effect has not been considered in most of the previous work. The photodegradation rate was enhanced by ∼212.7% in the photothermal-assisted system. This result reveals that photothermal conversion in CuS particles plays an important role in engendering highly efficient photocatalytic activity and the efficient utilization of solar energy.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Chuanmin Ding,Xue Wang,Kaijing Song,Bing Zhang,Junwen Wang,Zhihuan Zhao,Honghong Chang,Wenlong Wei
Herein visible light was utilized as activator to enable colorimetric immunoassay to detect tumor marker based on ternary GO-C 3 N 4 -AgBr heterojunction nanophotocatalyst. Firstly, synthesized photocatalyst GO-C 3 N 4 -AgBr could oxidize TMB due to photogenerated hole and the oxidation ability was enhanced due to ternary heterojunction structure. Secondly, depending on the specific binding of antigen and antibody, the sandwich-type immunocomplex were constructed on the platform of magnetic bead with advantages of convenient cleaning and easy separation. Finally, TMB was added into the ABS buffer solution of immunocomplex. Under visible light radiation, fast change in color was observed within 10 s. Under optimal conditions, there was a linear relation between absorbance and target protein concentration in the range of 0.5 ng mL −1 –25 ng mL −1 with the detection limit of 20 pg mL −1 . Meanwhile, the developed colorimetric immunoassay displayed preferable selectivity, repeatability, and stability.
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Catalysis Science & Technology
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2018
·Vol. 8
·期 10
·2578-2587
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IF 5.365
Yanzi Wang,Jing Sun,Haohai Zhang,Zhiping Zhao,Wenfang Liu
Coenzyme regeneration is important for the industrial utilization of oxidoreductase. In this work, reduced nicotinamide adenine dinucleotide (NADH) was regenerated under visible light via a photosensitizer and an electron donor. First, several photosensitizers including 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (TCPP), zinc porphyrin (ZnTCPP) and eosin Y (EY) with varied concentrations were compared. Next, using TCPP as the photosensitizer, the type and concentration of the electron donor, pH value and concentration of the buffer system for the reaction were optimized. Following that, TCPP was immobilized onto the surface of various supports for screening. Then, the immobilization conditions were optimized and the photocatalytic performance of silica-attached TCPP was studied. Lastly, the effect of a rhodium mediator on NADH regeneration was evaluated. The results show that the optimum concentration of TCPP, ZnTCPP and EY was 2, 1 and 4 mM, respectively, and the highest NADH yield of the TCPP system was 2.37 and 1.47 times those of the ZnTCPP and EY systems. With TCPP as the photosensitizer, triethanolamine was the most efficient electron donor and its appropriate concentration was 5 mM. The optimal pH value and concentration of the phosphate buffer was 7.0 and 0.05 M. Under these conditions, a high NADH yield of 81.5% was achieved after 60 min. For the supports examined, the thiol-containing silica microspheres coated with polydopamine and polyethyleneimine had the highest loading capacity of TCPP (9.15 mg per g-support). Via sensitization, the NADH yield was 9.64% after 90 min and was upgraded to 22.5% with the addition of the rhodium mediator.
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CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Hongju Han,Min Fu,Yalin Li,Wei Guan,Peng Lu,Xueli Hu
Polypyrrole-modified graphitic carbon nitride composites (PPy/g-C 3 N 4 ) are fabricated using an in-situ polymerization method to improve the visible light photocatalytic activity of g-C 3 N 4 . The PPy/g-C 3 N 4 is applied to the photocatalytic degradation of methylene blue (MB) under visible light irradiation. Various characterization techniques are employed to investigate the relationship between the structural properties and photoactivities of the as-prepared composites. Results show that the specific surface area of the PPy/g-C 3 N 4 composites increases upon assembly of the amorphous PPy nanoparticles on the g-C 3 N 4 surface. Owing to the strong conductivity, the PPy can be used as a transition channel for electrons to move onto the g-C 3 N 4 surface, thus inhibiting the recombination of photogenerated carriers of g-C 3 N 4 and improving the photocatalytic performance. The elevated light adsorption of PPy/g-C 3 N 4 composites is attributed to the strong absorption coefficient of PPy. The composite containing 0.75 wt% PPy exhibits a photocatalytic efficiency that is 3 times higher than that of g-C 3 N 4 in 2 h. Moreover, the degradation kinetics follow a pseudo-first-order model. A detailed photocatalytic mechanism is proposed with · OH and · O 2 − radicals as the main reactive species. The present work provides new insights into the mechanistic understanding of PPy in PPy/g-C 3 N 4 composites for environmental applications.
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 8
·2245-2252
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IF 2.137
Lin Tong,Yakai Feng,Xujun Sun,Ying Han,Dongshun Jiao,Xiaohua Tan
The encapsulation of high power light emitting diode (LED) needs the silicone resins to have relative high refractive index and thermal-aging properties. Herein, high refractive index adamantane-based phenyl epoxy-silicone (APES) resins for LED encapsulation were synthesized by the sol-gel condensation of 1-adamantane methanol propyltrimethoxysilane-3-urethane, γ-(2,3-epoxypropoxy)propytrimethoxysilane and diphenylsilanediol. These adamantane-based silicone resins have multifunctional groups including adamantyl group, phenyl group, and epoxy group in order to meet the various requirements for LED encapsulation. Importantly, the adamantane group in the silicone resins benefits for high refractive index and anti-thermal properties. These APES resins were characterized by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. When APES resins were cured by methylhexahydrophthalic anhydride, they showed relatively high refractive index of 1.56, high hardness, and high thermal resistance. The encapsulated LED demonstrated high adhesion properties by red-ink tests. These merits make adamantane-based silicone resins promising candidates as LED encapsulation materials.
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JOURNAL OF ELECTRONIC MATERIALS
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2018
·Vol. 47
·期 12
·7497-7504
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IF 1.566
Zheng Jingxia,Wang Junli,Wang Yaling,Yang Yongzhen,Liu Xuguang,Xu Bingshe
A one-pot microwave-assisted hydrothermal approach was developed to quickly synthesize yellow fluorescent carbon dots (CDs) using o -phenylenediamine and urea as raw materials. The optimized reaction temperature of 140°C and reaction time of 10 min were adopted to synthesize the CDs with photoluminescence quantum yield of 4.23%. The as-prepared CDs exhibit yellow fluorescence ( λ em ∼ 563 nm) and an excitation-independent PL emission in the region of 440–700 nm. The CDs were combined with a blue chip ( λ ex = 420 nm) to fabricate white light-emitting diodes (WLEDs) and realize white light emission. The WLED has the color coordinates of (0.30, 0.30) and the correlated color temperature of 7915 K, which is suitable for office and outdoor illumination. The results demonstrate that as-obtained CDs can be a promising candidate as yellow-emitting phosphors for WLEDs.
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Journal of Inorganic and Organometallic Polymers and Materials
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2018
·Vol. 28
·期 6
·2701-2713
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IF 1.754
Wu Gang,Guo Shuang,Yin Yue,Sun Gang,Zhong Yongjian,You Bo
This paper presented a facile method to prepare the silica/poly (methyl methacrylate) (SiO 2 /PMMA) nanocomposite hollow microspheres (NHSs) which were firstly applied to fabricate the light diffusion films with high transmittance and high haze simultaneously. The SiO 2 /PMMA NHSs were prepared via in situ diffusion of polymeric core into the voids of inorganic shell under strong electrostatic attraction. The hollow morphologies of the microspheres were studied under the help of transmission electron microscope and scanning electronic microscope. The formation process of these NHSs could be elucidated using a mechanism similar to the Kirkendall effect. These NHSs were firstly used to produce light diffusion films by blending with polyacrylate latex. The new kind of light diffusion films with micro-nano structure were built by casting the SiO 2 /PMMA NHSs/polyacrylate coatings on optical-grade PET films. The transmittance and haze value of the light diffusion films were tested by a haze meter and application on a LED lamp. As a result, the coating films with NHSs had the best light diffusion properties compared to those films with no spheres or nanocomposite solid microspheres, which indicated that the light diffusion films with NHSs were promisingly applied in LED illumination, photoelectric devices and large area LCD.
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ANALYTICAL CHEMISTRY
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2018
·
IF 6.042
Lili Liang,Long Jin,Yang Ran,Li-Peng Sun,Bai-Ou Guan
Highly sensitive detection of molecular tumor markers is essential for biomarker-based cancer diagnostics. In this work, we showcase the implementation of fiber light-coupled optofluidic waveguide (FLOW) immunosensor for the detection of p53 protein, a typical tumor marker. The FLOW consists of a liquid-core capillary and an accompanying optical fiber, which allows evanescent interaction between light and microfluidic sample. Molecular binding at internal surface of the capillary induces a response in wavelength shift of the transmission spectrum in the optical fiber. To enable highly sensitive molecular detection, the evanescent-wave interaction has been strengthened by enlarging shape factor R via fine geometry control. The proposed FLOW immunosensor works with flowing microfluid, which increases the surface molecular coverage and improves the detection limit. As a result, the FLOW immunosensor presents a log–linear response to the tumor protein at concentrations ranging from 10 fg/mL up to 10 ng/mL. In addition, the nonspecifically adsorbed molecules can be effectively removed by the fluid at an optimal flow rate, which benefits the accuracy of the measurement. Tested in serum samples, the FLOW successfully maintains its sensitivity and specificity on p53 protein, making it suitable for diagnostics applications.
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PubMed
高影响因子
Small
·
2018
·Vol. 14
·期 38
·1801754
·
IF 9.598
Wen Liu,Miaoliang Ruan,Yanming Wang,Rongguang Song,Xin Ji,Jiake Xu,Jian Dai,Wei Xue
Red blood cell (RBC) membrane-cloaked nanoparticles, reserving the intact cell membrane structure and membrane protein, can gain excellent cell-specific functions such as long blood circulation and immune escape, providing a promising therapy nanoplatform for drug delivery. Herein, a novel RBC membrane biomimetic combination therapeutic system with tumor targeting ability is constructed by embedding bovine serum albumin (BSA) encapsulated with 1,2-diaminocyclohexane-platinum (II) (DACHPt) and indocyanine green (ICG) in the targeting peptide-modified erythrocyte membrane (R-RBC@BPtI) for enhancing tumor internalization and synergetic chemophototherapy. R-RBC@BPtI displays excellent stability and high encapsulation efficiency with multiple cores enveloped in the membrane. Benefited from the stealth functionality and targeting modification of erythrocyte membranes, R-RBC@BPtI can significantly promote tumor targeting and cellular uptake. Under the near-infrared laser stimuli, R-RBC@BPtI presents remarkable instability by singlet oxygen and heat-mediated cleavage so as to trigger effective drug release, thereby achieving deep penetration and accumulation of DACHPt and ROS in the tumor site. Consequently, R-RBC@BPtI with tumor-specific targeting ability accomplishes remarkable ablation of tumors and suppressed lung metastasis in vivo by photothermal and chemotherapy combined ablation under phototriggering. This research provides a novel strategy of targeted biomimetic nanoplatforms for combined cancer chemotherapy–phototherapy.
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高影响因子
MATERIALS RESEARCH BULLETIN
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2018
·
IF 2.873
Feng Hou,Yong Li,Yanting Gao,Shan Hu,Baogang Wu,Hongliang Bao,Hong Wang,Baojiang Jiang
Non-metallic boron modified graphitic carbon nitrogen (BCN) tube was prepared by a simple hydrothermal method using melamine as initial material and boric acid as boron source. Through thermal treatment, boron was directly introduced into g-C 3 N 4 tube structure. Boron modified could increase the specific surface area of g-C 3 N 4 and enhance its visible-light responsiveness. Importantly, the separation of the photogenerated electrons and holes in BCN tube was significantly enhanced, which can contribute to the improvement of photocatalytic activity. The photocatalytic activity of BCN tube was evaluated by degrading Rhodamine B (RhB) and Methylene blue (MB) experiments under visible light irradiation. The prepared BCN-3 sample (B: 0.36 mol %) showed the best photocatalytic activity when the initial material molar ratio of melamine to boric acid was 1:1. The degradation rate of BCN-3 to RhB was 99.3% under visible light irradiation for 90 min. The catalyst also showed good degradation effect for MB.
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