APPLIED SURFACE SCIENCE
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2014
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IF 2.538
Zhiyin Chao,Lan Wang,Linyong Song,Yifeng Zhou,Wangyan Nie,Pengpeng Chen
Surface hydroxyl-functionalized poly(styrene- co -hydroxyethyl acrylate) [P( S - co -HEA)] microsphere were used to prepare P( S - co -HEA)/silver composite particles. Based on the weak interaction between silver ions and hydroxyl, silver ions were adsorbed onto the polymer surface and reduced by diethanolamine (DEA). The morphology of P( S - co -HEA)/Ag was easily controlled by the molar ratio of DEA/AgNO 3 . The composite particles were characterized by SEM, XRD, and UV–vis spectroscopy. The obtained P( S - co -HEA)/Ag particles with small and denser silver nanoparticles showed a high efficient activity to catalyze reduction of methylene blue (MB). While the P( S - co -HEA)/Ag particles with big and denser silver nanoparticles showed highly sensitive Raman enhanced performance.
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高影响因子
Journal of Materials Chemistry A
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2013
·Vol. 1
·期 22
·6614-6621
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IF 0
Xinchen Li,Wallace C. H. Choy,Fengxian Xie,Shaoqing Zhang,Jianhui Hou
While metal oxide films are typically formed by high-temperature and sputtering processes, we report an approach with the features of a room-temperature, water-free and solution-based process for the formation of a molybdenum oxide (MoOx) film for inverted organic solar cells (OSCs) by proposing a vacuum treatment at room temperature and selecting an appropriate solvent. Remarkably, our results indicate that the vacuum treatment can introduce oxygen vacancies in the molybdenum oxide film and modify its work function for functioning as an efficient hole transport layer. To further improve OSC performances, a silver nanoparticle–molybdenum oxide (Ag NP–MoOx) composite film is prepared by the introduction of Ag nanoparticles into the solution. Evidence and explanations confirm that OSC performance enhancement is mainly due to the improvement of the electrical properties of the Ag NP–MoOx composite film. With the optimized composite film, inverted OSCs with a power conversion efficiency (PCE) of 7.94% are achieved. Through the demonstration of high performance inverted OSCs with different polymer materials, the water-free, room-temperature and solution-processed MoOx can contribute to the evolution of high performance OSCs such as inverted and tandem OSCs and other optoelectronic devices.
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CARBON
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2015
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IF 6.196
Jizhou Jiang,Lihua Zhu,Jing Zou,Lei Ou-yang,Anmin Zheng,Heqing Tang
Surface-enhanced Raman scattering (SERS) substrates with high SERS activity and stability are important for SERS sensors. A facile method was developed to fabricate efficient and stable SERS substrates by combining Ag nanoparticles (NPs) and micro-scale sheeted graphitic carbon nitride (g-C 3 N 4 ). The g-C 3 N 4 /Ag NPs hybrid could provide a great number of hot spots and concentrated the analyte by the π–π stacking interaction between analyte molecules and g-C 3 N 4 , making a dramatic Raman enhancement. Moreover, the g-C 3 N 4 /Ag NPs hybrid uniformly immobilized Ag NPs on the surface and edges of g-C 3 N 4 sheets by an interaction between Ag NPs and g-C 3 N 4 , leading to much improved long-term stability. This could be explained in terms of the electron–donor effect of g-C 3 N 4 , which was further confirmed by density functional theory calculations. The inherent Raman enhancing effect of g-C 3 N 4 itself also contributed to the total SERS responses. Due to multiple enhancement contributions, the g-C 3 N 4 /Ag NPs hybrid exhibited a strong Raman enhancement effect for with an enhancement factor of 4.6 × 10 8 (evaluated by using crystal violet as a probe), and possessed wide adaptability from dyes, pesticides to bio-molecules.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2014
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IF 3.633
Huyan Shi,Fu Liu,Lixin Xue,Huafeng Lu,Qingbo Zhou
Ag-loaded zeolites were synthesized and embedded into the outer layer of poly(vinylidene fluoride) (PVDF) dual-layer hollow fiber membrane (D) using a dry-jet wet-spinning co-extruding technique. The distribution of the Ag-loaded zeolites in the outer layer was confirmed by field emission scanning electron microscopy (FE-SEM) and energy-dispersive X-ray spectroscopy (EDX). It was found that the D contained only 54% of the amount of Ag-loaded zeolites that were distributed throughout the cross section of PVDF single-layer hollow fiber membrane (S), as calculated by thermogravimetric analysis (TGA). However, D showed excellent antibacterial efficiency and resistance to bacterial adhesion because of the higher concentration of Ag + in the outer layer of the membrane. The surface morphologies , pure water flux, mean pore size, pore size distribution , and thermal stability of both PVDF membranes were also investigated.
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2013
·
IF 2.505
Shi Dongjian,Sui Jing,Duan Fang,Chen Mingqing,He Bingxiao
Thermal-sensitive poly( N , N -diethylacrylamide) grafted poly(acrylonitrile/styrene) (PDEAm- g -PAN/PSt) polymeric microspheres were prepared from PDEAm macromonomer, St and AN by dispersion copolymerization . The polymeric microspheres had raspberry-like morphology with large surface area. Palladium–metal (Pd–M) (M: copper, Cu, silver , Ag) bimetallic nanoparticles were stabilized on the surface of the PDEAm- g -PAN/PSt microspheres via the coordinate interaction between amide groups in PDEAm and metal ions with the reduction of the corresponding ions. Transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and thermogravimetry analysis (TGA) results confirmed the size and composition of the immobilized Pd–M nanoparticles. The Pd–M bimetallic nanoparticles showed superior catalytic efficiencies for the reduction of 4-nitrophenol (4-NP) than the monometallic nanoparticles. The catalytic activity of the Pd–M bimetallic catalysts could be controlled by the molar ratio of Pd and M ions and composition of Pd–M nanoparticles. Moreover, the catalytic property of the Pd–M nanoparticles could be regulated by temperature and increased with increasing the temperature above lower critical solution temperature (LCST). Furthermore, the Pd–M nanoparticles could be easily recycled and reused to catalyze 4-NP for five times without loss of activity. These bimetallic nanoparticles possess great potential in future practical application in catalytic technology.
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高影响因子
CARBOHYDRATE POLYMERS
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2015
·
IF 4.074
Zidan Zhou,Xinwen Peng,Linxin Zhong,Lan Wu,Xuefei Cao,Run Cang Sun
Electrospun cellulose acetate (CA) membrane was employed as a support that provided sites for AgCl crystals in situ growth. The Ag@AgCl crystals on electrospun CA composites with exposed {1 0 0} and {1 1 1} facets were fabricated at room temperature by a double diffusion technique. The crystal structure, morphology, composition, and absorption light ability of CA supported Ag@AgCl were characterized utilizing X-ray powder diffraction (XRD), scanning electron microscopy (SEM), attenuated total reflection-infrared intensity (ATR-IR), X-ray photoelectron spectroscopy measurements (XPS), energy dispersive spectrometer (EDS) and ultraviolet–visible (UV–vis) diffuse reflectance spectra, respectively. The photocatalytic activity of the catalysts was evaluated using methyl orange (MO) as a target. The CA supported cubic Ag@AgCl catalyst exhibited much higher catalytic activity than octahedral catalyst in terms of the degradation of MO under visible light. The 10 mg CA based cubes could completely degrade MO (10 mg L −1 ) in 160 min. The photocatalyst still exhibited a good catalytic ability after three times.
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PubMed
高影响因子
Analytical Methods
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2015
·Vol. 7
·期 15
·6103-6108
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IF 1.821
Yuling Hu,Dongmei Wang,Gongke Li
Inspired by the bioadhesive and redox properties of the 3,4-dihydroxy-phenylalanine (DOPA) contained in marine mussels, a facile, rapid and economic colorimetric strategy for Hg2+ detection was developed. The abundant catechol chains on the surface of Ag@DOPA can reduce Hg2+ to Hg0 and form a Ag@DOPA@Hg nanostructure with the deposition of Hg0. The nanostructures of Ag@DOPA and Ag@DOPA@Hg were confirmed by X-ray photoelectron spectroscopy, transmission electron microscopy, elemental mapping and Fourier transform infrared spectroscopy. The formation of the Ag@DOPA@Hg nanostructure causes a change in the color of the Ag@DOPA colloids from golden yellow to purple blue, making it directly possible to detect Hg2+ using a colorimetric strategy within 5 minutes. With increasing concentrations of Hg2+ from 10 nM to 4 μM, the surface plasmon resonance absorbance peak of the Ag@DOPA colloids decreased in intensity and exhibited a good linear relationship with the Hg2+ concentration. The limit of detection was determined as 5 nM. Furthermore, this response was found to be highly selective for Hg2+ as the absorption spectrum was not affected by other metal ions such as Pb2+, Cr3+, Cu2+, Al3+, Ni2+, Co2+, etc. The excellent stability, selectivity and sensitivity of this strategy offer analytical practicability for Hg2+ detection in real water samples with recoveries in the range of 104–105% and cosmetic samples with recoveries in the range of 85–103%.
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高影响因子
Journal of Materials Chemistry A
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2014
·Vol. 3
·期 8
·4307-4313
·
IF 0
Xianchun Liu,Renxi Jin,Dashu Chen,Lin Chen,Shuangxi Xing,Hongzhu Xing,Yan Xing,Zhongmin Su
In this study, we report a simple in situ auto-reduction strategy for the fabrication of Ag@FDU-15 nanocomposites, in which the small sized Ag nanoparticles are monodispersed in the channels of FDU-15 ordered mesopolymers. The as-prepared Ag@FDU-15 nanocomposites were characterized by small and wide angle X-ray diffraction (XRD), nitrogen sorption, thermo-gravimetric analysis (TGA), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). TEM results show that the silver nanoparticles are uniformly dispersed with a mean diameter of 5.6 ± 0.5 nm. When used as a hydrogenation catalyst, the Ag@FDU-15 nanocomposites exhibit excellent catalytic performance and reusability for the reduction of 4-nitrophenol (4-NP) in the presence of NaBH4.
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BIOSENSORS & BIOELECTRONICS
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2017
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IF 7.78
Nan Hao,Rong Hua,Saibo Chen,Ying Zhang,Zhou Zhou,Jing Qian,Qian Liu,Kun Wang
In this study, Ag/TiO 2 /3D nitrogen doped graphene hydrogel (3DNGH) was prepared for the first time and the photocurrent intensity of this material was greatly enhanced, which was attributed to the multiple enhancements accomplished in one step. The porous structure of 3DNGH could provide an exceptionally large accessible surface area, which was beneficial for the anchoring of Ag and TiO 2 nanoparticles . The introduction of nitrogen doped graphene and metal nanoparticles was capable to facilitate the charge separation efficiency and accelerate the transfer rate of the photogenerated electron-hole pairs. Then the photoelectrochemical performance was further amplified by the localized surface plasmon resonance of Ag nanoparticles. On the basis of excellent PEC properties of Ag/TiO 2 /3DNGH, a sensitive label-free PEC sensor has been established for the determination of thrombin successfully. This proposed PEC biosensor exhibited good PEC performances with a wide linear in the range from 0.01 p.M. to 10 p.M. as well as a relative low detection limit of 3 fM (S/N = 3), indicating that Ag/TiO 2 /3DNGH would serve as a promising photoactive material in the applications of PEC biosensors.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Yue Gao,Xiangyi He,Rong Hu,Qing Li
In this study, we synthesized Ag-doped Au/Ag nanoclusters (GSH-Au/Ag NCs) with enhanced luminescence. We conducted a comprehensive investigation into the mechanism behind KMnO 4 -induced fluorescence (FL) quenching of these bimetallic nanoclusters and, leveraging this understanding, developed a sensitive fluorescent method for determining acid phosphatase activity (ACP). The fluorescence quenching mechanism was attributed to a combination of the inner filter effect (IFE) and redox reactions. Subsequently, ascorbic acid (AA) was generated from L-ascorbic acid 2-phosphate trisodium salt (AAP), which was selectively hydrolyzed by ACP . The released AA then reduced KMnO 4 , leading to the inhibition of fluorescence quenching of GSH-Au/Ag NCs by KMnO 4 . This innovative approach exhibited higher sensitivity, with a lower limit of detection of 0.0085 U/L (S/N = 3) for ACP activity sensing. Our proposed strategy was successfully applied to analyze ACP activity in human serum samples, demonstrating promising potential for the widespread utilization of metal nanoclusters in various applications.
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高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Xiaoxuan Fan,Yonggui Zheng,Zimin Yao,Pingping Liang,Xuemei Lu,Jianbo Xu,Baijie Guan,Tianya Tan,Shuo Cao,Yang Zhao,Kexin Wang,Feifei Yin,Jiwei Wang
Long afterglow photocatalyst has shown the potential to support all-weather photocatalytic reactions. In this work, an Ag/Ca2Al2SiO7: Pr3+ (Ag/CASO: Pr3+) composite has been synthesized to enhance afterglow-driven photocatalytic activity. Ag loading introduces the surface plasmon resonance (SPR) effect to increase light absorption capacity. It extends the afterglow duration and improves the afterglow intensity via the storage and release of hot electrons. The Schottky junction between Ag and CASO: Pr3+ inhibits the recombination of photogenerated electrons and holes and increase the active sites in photocatalytic reactions. The photodegradation performance of Ag/CASO: Pr3+ was increased by up to 6.6-fold compared to CASO: Pr3+ under afterglow driven. The concentration of active species was further increased by adding Fe3+ and H2O2 to construct the Fenton system. Ag/CASO: Pr3+ can achieve a 55% removal rate of TC and 60% removal rate of NFX under its own afterglow-driven within 1 h after 10 min of ultraviolet light irradiation. This work expands the use of long afterglow luminescence materials and advances the development of all-weather photocatalytic technology.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Yaxi Tan,Kuanjun Fang,Weichao Chen,Qi Shi,Chunming Zhang
A superhydrophobic cotton fabric with unidirectional moisture transfer ability, antibacterial, and oil-water separation capabilities was fabricated by combining a simple coating method and oxygen plasma etching. Polydimethylsiloxane (PDMS) was employed to impart low surface energy to the cotton fabric, thereby endowing it with hydrophobic characteristics. The synthesized quaternized chitosan/TiO 2 /Ag (CTA) compound was subsequently applied onto the cotton fabric surface to introduce a desirable level of surface roughness, thus enhancing its hydrophobic properties and conferring excellent antibacterial efficacy. The cotton was subsequently treated by oxygen plasma to trigger asymmetrical wetting on both sides. The experimental findings reveal that the optimally treated cotton fabric exhibits hydrophobic properties on the bottom surface, with a water contact angle (WCA) reaching 162.8°, while the upper surface displays hydrophilic behavior, establishing a wetting gradient along the thickness direction. Notably, even under the influence of reverse gravity, water droplets are capable of transferring from the back to the top surface within 2 s, while preventing reverse penetration of liquid. Moreover, the synthesized compound CTA endows the cotton fabric with efficient and long-lasting antibacterial properties through two modes (contact and release sterilization modes) and three sterilization mechanisms (electrostatic interaction, plasma surface resonance effect, and reactive oxygen species). Remarkably, within a time frame of only 1 h, the modified cotton fabric is able to achieve a kill rate exceeding 99% against Escherichia coli and Staphylococcus aureus . Moreover, the aforementioned properties demonstrate outstanding durability against repeated washing, continuous abrasion, exposure to strong acid/base, and ultraviolet radiation. Additionally, this modified cotton fabric exhibits remarkable efficiency in terms of oil-water separation, effectively separating both light and heavy oil from water. It is worth noting that the preparation process is cost-effective, environmentally friendly, and free from fluorine.
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高影响因子
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