APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Hongjun Fang,Yusong Pan,Haixian Yan,Xiulong Qin,Chao Wang,Linfeng Xu,Chengling Pan
A novel Yb 3+ /Tm 3+ co-doped Ti 3 C 2 /Ag/Ag 3 VO 4 composite with stable and robust photodegradation performance was synthesized by in-situ partially reduction along with hydrothermal strategy. In the composite, block-like Ag 3 VO 4 particles are self-assembled on the surface of 2D Ti 3 C 2 MXene accompanied by partial reduction of Ag + to Ag 0 . Photodegradation results showed that the resulting Yb 3+ /Tm 3+ co-doped Ti 3 C 2 /Ag/Ag 3 VO 4 composite with optimal Yb/Tm proportion (Y/T:0.3/0.005) presented a boosting photocatalytic performance for degradation of tetracycline (TC) and organic dyes under visible light irradiation. The removal efficiency was 97% for TC in 20 min, 96% for rhodamine B in 25 min, and 99% for methylene blue in 20 min, which was higher than that of Ag/Ag 3 VO 4 composite. As manifested by photoelectrochemical measurements, the enhanced photocatalytic performance of the Y/T:0.3/0.005 composite was attributed to the improved light absorption and excellent charge separation induced by the formation of intermediate energy states after co-doping Yb 3+ /Tm 3+ ions. Meanwhile, the photocatalytic mechanism of the photocatalyst was also investigated through electron spin resonance (ESR) spectra and trapping experiments, which verified that the active species of h + and ·O 2 − play the important role for photodegradation of tetracyline and organic dyes.
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COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Hao Yuan,Ting Li,Yang Wang,Xiaofan Wang,Xuhui Zhang,Bihua Xia,Piming Ma,Tianxi Liu,Mingqing Chen,Weifu Dong
Thermal conductive polymeric composites are becoming more and more important in the rapid development of new generation electronic equipment, which can quickly dissipate the heat generated by the equipment to ensure their stable operation with high reliability. Nowadays, the most effective way to prepare thermal conductive polymeric composites is to incorporate efficient thermal conductive fillers into polymers. However, the large thermal resistance at interfaces and degradation of mechanical properties arising from the large filler content restrict their practical applications. Herein, surface modification of BNNS by polydopamine (PDA) was carried out to improve the interfacial compatibility and interaction between fillers and polymer matrix , a simple doctor blading method was adopted to prepare PVA composite films with an aligned structure. In addition, the decoration of silver nanoparticles on BNNS surface and the addition of small amount of GO can help to promote the continuity and reduce the defect of the filler skeleton. Thus, an increase in thermal conductivity (in-plane: 6.54 W m −1 K −1 , through-plane: 1.03 W m −1 K −1 ) was observed in PVA/BNNS-PDA-Ag (10 wt%)/GO (0.5 wt%) composite film, which also possessed excellent flexibility and a favorable mechanical property of 97.1 ± 5.1 MPa.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yi Xu,Md Mehedi Hassan,Afang Zhu,Huanhuan Li,Quansheng Chen
A new dual-mode optical-nano-sensor was designed to effectively isolate, discriminate and inactivate multiple foodborne pathogens through the combined effort of magnetic SERS tags and functionalized upconversion nanoparticles. The positively charged quaternary ammonium salt (QAS) functionalized upconversion nanoparticles (UCNPs@QAS) were used as a fluorescent probe for the analysis of total bacteria count and inactivation of bacteria, and 4-mercaptophenylboronic acid (4-MPBA) modified magnetic Au@Ag NPs (MAu@Ag@MPBA) were applied as a SERS tag for isolation and classification of bacteria. Various types of bacteria can be captured by UCNPs@QAS through electrostatic interactions and by MAu@Ag@MPBA via the reversible recognition interaction of a boronic acid group of 4-MPBA and peptidoglycan from bacteria simultaneously. And then the formed complex structural assemblies were isolated rapidly from the sample matrix by employing the magnetic force for fast and simple dual-model optical detection. In addition, the novel biosensor was successfully applied to discriminate and detect Escherichia coli , Salmonella , Staphylococcus aureus, and their mixture in contaminated milk with the classification rate of 97.2–100 %. The proposed multi-functional nano-platform was able to sensitively capture, detect, and kill foodborne pathogens in a complex system, which could be deployed successfully towards the monitoring of food safety.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Huihui Xie,Hui Zhang,Xinxin Liu,Shenglong Tian,Yunsi Liu,Shiyu Fu
A lignin-based PU coating was prepared for paper-based green packaging. Two representative diisocyanate were used to prepare the coatings. Due to the rigid aromatic, the physical properties of the TDI system reached the maximum below the lignin content of 40%. The HDI that contains flexible aliphatic chains alleviated the brittleness of coating, and it showed physical advantages when the lignin content was more than 50%. Owing to the high lignin content, the coating presented enhanced thermal stability . After coated with the lignin-based PU coatings, the dry tensile strength of coated paper was improved by 126%. Amazingly, the wet strength was increased from 0.31 to 12.6 MPa with an improvement nearly 40 times. Based on the coordination of lignin, Ag + was introduced into the PU matrix, which imparted the coating with excellent antibacterial ability. The colony forming units of E. coli and S. aureus were both less than 1. However, no inhibition halo was observed, which indicated that the Ag was firmly anchored on the coating and the antibacterial ability is only available when the bacterial contact the coating surface. The lignin-based PU coating with favorable sustainability and properties shows great potential in paper-based green packaging fields.
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高影响因子
Optical Materials Express
·
2021
·Vol. 11
·期 7
·2076-2088
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IF 3.442
Chen Junfan,Chen Hongxian,Zhang Jie,Zhu Yong
Combining self-assembly technology and the thin-film annealing method, annealed Ag nano-islands (Ag NIs) with SiO2 microsphere (MS) arrays were prepared as surface-enhanced Raman scattering (SERS) substrate in this paper. A “top-binding” model was established to analyze the effect of SiO2 MS at different annealing temperatures and different Ag film thickness. The corresponding comparative analysis with and without MS templates have been carried on. We simulated the electric field enhancement, coupling enhancement spectrum and the optical focus function of SiO2 MS. Characterization and experiments showed that the use of a SiO2 MS array as a dewetting template can well regulate the size and morphology of Ag NIs. Among them, SiO2 MS-Ag-20 can achieve the most uniform particle size at an annealing temperature of 873.15 K. According to the UV-Vis absorption spectrum, it had an active SERS analytical enhancement factor (AEF) of ∼3.91×105 and good SERS reproducibility (relative standard deviation, RSD = 0.113) for R6G when the wavelength was 532 nm.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Chundong Liu,Maosen Yang,Jing Yu,Fengcai Lei,Yisheng Wei,Qianqian Peng,Chonghui Li,Zhen Li,Chao Zhang,Baoyuan Man
Surface-enhanced Raman spectroscopy (SERS) is widely used in chemical analysis, with very promising application prospects in daily life. However, there are still lots of problems in actual operation, for instance, pollutant detection from sewage, in which the analyte is often dispersed in nonhomogeneous solutions, leading to inaccurate Raman signal collection. Adjusting surface wettability to realize selective self-separation of multiphase liquids in situ on SERS substrate is an effective and challenging approach. In this work, a complex of CuO@Ag nanowires on Cu mesh modified by different wettability, converting from hydrophilic to hydrophobic by simple infrared illumination, is prepared as a multifunctional SERS substrate. Benefitting from the controllable wettability of the substrate, the multiphase solution can be self-separated and adsorbed at the two opposite terminals of it, and the 10 −9 M of malachite green and 10 −5 M of thiram used as two kinds of probe molecules can be separately detected at these two terminals. In addition, after fully hydrophobic modification, the substrate can be also used to extract the organic phase in the ‘water/oil’ mixture and perform in situ detection of the probe molecules in the ‘oil’.
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Polymers
·
2020
·Vol. 12
·期 1
·120
·
IF 3.426
Lu Gan,Aobo Geng,Ying Wu,Linjie Wang,Xingyu Fang,Lijie Xu,Changtong Mei
In the present study, flexible and conductive nanofiber membranes were prepared by coating PLA nanofibrous scaffolds with carbon nanotubes and silver nanoparticles. The morphology and structure of the prepared membrane was characterized, as well as its mechanical properties, electrical sensing behavior during consecutive stretching-releasing cycles and human motion detecting performance. Furthermore, the antibacterial properties of the membrane was also investigated. Due to the synergistic and interconnected three-dimensional (3D) conductive networks, formed by carbon nanotubes and silver nanoparticles, the membrane exhibited repeatable and durable strain-dependent sensitivity. Further, the prepared membrane could accurately detect the motions of different body parts. Accompanied with promising antibacterial properties and washing fastness, the prepared flexible and conductive membrane provides great application potential as a wearable fabric for real-time body motion sensing.Keywords:PLA nanofiber;flexible membrane;carbon nanotubes;silver;antibacterial properties;electrical properties
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高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 3
·1649-1659
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IF 3.917
Zhou Zidan,Zhong Linxin,Zhang Lei,Ma Jiliang,Peng Xinwen,Sun Runcang
Hydroxyl-rich waste fibers have been utilized as support to synthesize paper derived monodispersed Ag composites. We utilized the one-step thermal reduction and carbonization method to synthesize a meso-pore carbon frame with mono-dispersed silver nanoparticles (Ag@C). The Ag@C showed excellent catalytic activity in 4-nitrophenol reduction reactions attributing to their well dispersed silver nanoparticles and high surface area. The Ag@C catalyst could be recycled for ten times without significant loss of its catalytic activity. Furthermore, the Ag@C could be used as a Surface-enhanced Raman scattering (SERS) substrate, and the SERS signals strength were shown to be seven times higher than unloaded carbon membrane. The results clearly indicated that the Ag nanoparticle-loaded recycled fibers exhibited SERS activity, rendering it an excellent SERS substrate for practical applications. The efficient utilization of the widely accessible waste fibers from paper-making industry could provide a sustainable feature of this work to reduce manufacturing cost and contribute it to be an environment-friendly bifunctional material.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Ziwei Deng,Peihua Wen,Ni Wang,Bo Peng
Surface-enhanced Raman scattering (SERS) allows for label-free detection of analyte molecules with high sensitivity, but it is still vastly challenged for the detection of ultra-highly diluted analyte solutions in practice, e.g., femtomolar concentrates, 10 −15 M. Here, we report a facile approach for the fabrication of hierarchical superhydrophobic melamine-formaldehyde/Ag (MF/Ag) nanocomposite array substrates, applicable for ultra-highly sensitive SERS detection of biological analytes at very low concentrations up to femtomolar levels. Hierarchical superhydrophobic MF/Ag nanocomposite arrays are synthesized by integrating colloidal lithography at the air-liquid interface and in-situ interfacial reactions. These substrates can confine analyte molecules within the localized sensing regions, so as to effectively prevent the random spread of analyte molecules. In this way, these substrates are able to detect dopamine with a detection limit of 10 -15 M, and with a SERS enhancement factor (EF) as high as 3.21 × 10 10 . The substrates are durable and the SERS results are reproducible. For practical demonstration, these superhydrophobic SERS-active substrates are also applied for detecting proteins, lysozyme and hemoglobin at low concentrates. This work presents a straightforward way to synthesize the hierarchical superhydrophobic SERS-active substrates with superior sensitivity and long-term reproducibility, with rational modification, which might merit the practical SERS applications in detection of drug and pollutants in extremely dilute environments.
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Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Lina Xu,Xiaohua Yang,Haiyang Ding,Shouhai Li,Mei Li,Dan Wang,Jianling Xia
A simple synthesis strategy was designed and applied to synthesize nitrogen and sulfur co-doped aminated ligninsulfonate/graphene quantum dots (ASL/GQDs) composites using citric acid monohydrate and byproducts of the sulfite-pulping procedure (sodium lignosulfonate). The combination of these two materials improves surface chemical activities and electronic characteristics. As a result，the combination offers excellent photoluminescence properties and sensitivity. The fluorescence intensity of the as-prepared ASL/GQDs composites is more than three times that of the free GQDs. ASL/GQDs based fluorescent probe was applied to sensitively determine Ag + with a good linearity in a range from 0.005 to 500 μM with a correlation coefficient of 0.99. The method was also used successfully to determine the amount of Ag + in environmental water samples. Using an MTT assay, the ASL/GQDs have low toxicity and are biocompatible with A549 cells, and may be successfully used to image A549 cells.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 4
·2211-2218
·
IF 1.093
Tao Cai-Hong,Chen Tiandi,Ma Fusheng,Liu Hui,Li Xiuqi,Lin Shenghong
The submicron-sized Fe3O4 particles were synthesized by solvothermal method. Then polydopamine (PDA) was used to modify the surface of Fe3O4 particles. And then the core—shell Fe3O4@PDA@BSA (single layer and multilayer)
microspheres were prepared by the layer by layer self-assembly method (SAM). In addition, Ag nanospheres were grafted onto the surface of Fe3O4@PDA particles to obtain Fe3O4@PDA-Ag core—shell nanoparticles using silver mirror reaction. The
morphology and component of the obtained core—shell particles were characterized by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The biocompatibility of the microspheres was researched in vitro by MTT method and its magnetic properties were
also evaluated. The results showed that the microsphere has excellent magnetic properties and good biological safety. Then the catalytic performance of Fe3O4@PDA-Ag microspheres for methylene blue (MB) was studied. And the antimicrobial properties of Fe3O4@PDA-Ag
microspheres for Escherichia coli and Bacillus subtilis were also be discussed. The results indicated good catalytic properties and antibacterial properties.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zaizai Yu,Bowen Zhan,Binghui Ge,Yingtao Zhu,Ying Dai,Guangjun Zhou,Fapeng Yu,Peng Wang,Baibiao Huang,Jie Zhan
The efficiency and stability of plasmonic photocatalysts that closely related with microstructure characteristics are intensively studied for practical applications. Here, a plasmonic photocatalyst Ag/AgNbO 3 was successfully synthesized by a facile combustion method, and systematically characterized by XRD, XPS , DRS, SEM, TEM and photocurrent techniques. The photocatalytic activity of Ag/AgNbO 3 as a function of Ag vs Nb contents are assessed toward Rhodamine B (RhB) and tetracycline (TC) degradation under the visible-light. At an optimal Ag content, the greatest photocatalytic efficiency of as-prepared Ag/AgNbO 3 on photodegradation of RhB (0.0447 min −1 ) was 2 times higher than that of currently reported solvents routes (0.0213 min −1 ). Meanwhile, the experimental and theoretical studies were conducted to examine the photocatalytic efficiency and stability of the as-prepared photocatalysts, the results show that the photocatalytic efficiency and stability are related with the SPR effect, ferroelectric polarization, specific exposed crystal-facets and interfacial crystallinity . This work may also provide new ideas for the design and preparation of other highly efficient and stable plasmonic photocatalysts.
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