MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2014
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IF 1.761
Sheng-ying Ye,Sheng-wen Shen,Lu-meng Ye,Xian-liang Song,Shu-can Luo
Silver nanoparticles (AgNPs), obtained by reduction from AgNO 3 solution and stabilized in polyvinyl pyrrolidone (PVP), have been synthesized by γ-ray radiolysis . The application of photoelectrocatalytic (PEC) oxidation in ethylene gas treatment using a TiO 2 photocatalyst combined with as-prepared AgNPs on activated carbon fiber (ACF) ([Ag+TiO 2 ]/ACF) as a photoelectrode in a Nafion-based photoelectrocatalytic cell is presented. The effects on the PEC degradation of C 2 H 4 of the preparation parameters of the AgNPs, such as the radiation dose and the amount of PVP added, have been systematically investigated. Emphasis is placed on comparison of the C 2 H 4 decomposition rate constant with [Ag+TiO 2 /ACF] as a photoelectrode in a photoelectrocatalytic cell with that achieved with [TiO 2 /ACF]. The factors responsible for the enhancing effect of AgNPs on the PEC activity of the [Ag+TiO 2 /ACF] photoelectrode are discussed.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2014
·Vol. 38
·期 8
·3999-4006
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IF 3.159
Zhenzhen Wang,Shangru Zhai,Bin Zhai,Zuoyi Xiao,Feng Zhang,Qingda An
Novel protocol towards multifunctional magnetic organic–inorganic core–shell nanostructured catalysts of Fe3O4@SN/HPW@CG–Ag with tailored properties are presented in this work. Such nanocomposites congregate the properties and functions of a single component into a whole. For instance, Fe3O4 cores protected by amino-functionalized SiO2 shell endowed the composites with superparamagnetism (28.6 emu g−1) and thereby facilitate the process of separation and recovery. Phosphotungstic acid, as a bridging agent, provided a strong interaction for the anchoring of glutaraldehyde cross-linked chitosan onto the surface of Fe3O4@SN. More interestingly, chitosan could simultaneously behave as a stabilizer and reductant for the in situ synthesis of “green” Ag NPs without addition of any other reducing agent or organic solvent, and Ag NPs provided the compounds with a catalytic performance. Further the size, loading of Ag NPs and the thickness of the chitosan layer were all controllable. Meaningfully, the as-synthesized catalyst Fe3O4@SN/HPW@CG–Ag exhibited an exceptional catalytic performance for the reduction of 4-nitrophenol in the presence of sodium borohydride (the reaction was accomplished within 7 min) and could be reused at least 10 times with good stability by means of convenient magnetic separation. Thence, the design philosophy of the multifunctional robust Ag-based nanocatalysts may pave the way for the synthesis of other catalyst systems with long-term stability.
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MATERIALS CHEMISTRY AND PHYSICS
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2014
·
IF 2.129
Yecang Tang,Ting Wu,Botao Hu,Qian Yang,Li Liu,Bo Yu,Yi Ding,Shiyong Ye
Ag nanoparticles (AgNPs)-containing hybrid microgels were prepared by in situ reduction of Ag + ions pre-dispersed in copolymer microgels of poly ( N -isopropylacrylamide-co-2-(dimethylamino)ethyl methacrylate) (P(NIPAM-co- DMA)). The prepared hybrid microgels possess excellent thermo- and pH-responsive properties and exhibit a responsive swelling and shrinking behavior. The increase in pH can induce a decrease in the absorption intensity and a blue shift of the surface plasmon band of AgNPs, which is attributed to a reduction in the polarity of AgNPs surroundings as a result of the conformational change of PDMA segments. Furthermore, the hybrid microgel was found to be an active catalyst for the reduction of methylene blue by NaBH 4 in aqueous solution. The effects of temperature and the amount of catalyst on the reduction rate were investigated using UV–vis spectrophotometry . Kinetic studies indicate that the apparent reaction rate constant k app follows the typical Arrhenius-type dependence on temperature in the range of 25 ∼ 40 °C and the activation energy is 62.0 kJ mol −1 . The AgNPs embedded in hybrid microgels show good thermal and chemical stability and the catalytic activity remains unchanged after storage for 40 days at room temperature. Such hybrid microgels, with the merits of good thermal and chemical stability as well as the catalytic activity, have a potential application in the field of heterogenous catalysis.
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RSC Advances
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2015
·Vol. 5
·期 121
·99914-99919
·
IF 3.84
S. N. Chen,X. Li,S. Han,J. H. Liu,Y. Y. Zhao
Ag–molecularly imprinted polymer (MIP) hybrid composites (Ag@MIPs) were prepared for the ultra-sensitive detection of organic pollutants in water based on surface enhanced Raman scattering (SERS). The prepared Ag@MIPs hybrid, with about a 2 nm ultrathin polymer shell, exhibited high affinity. Meanwhile, upon SERS measurements, the limit of detection for the Ag@MIPs hybrid can be as low as 10−12 M for the target molecule Rhodamine B, which was three orders of magnitude higher than classical SERS detection on silver nanoparticles. Furthermore, the Ag@MIPs hybrid also showed good reproducibility and high selectivity toward structurally related analogues. In addition, the present work provides a promising platform for the highly sensitive and selective detection of organic pollutants in water based on SERS measurements.
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APPLIED SURFACE SCIENCE
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2015
·
IF 2.711
Guangliang Chen,Xiaolei Si,Jinsong Yu,Huiyu Bai,Xianhui Zhang
This paper reports the synthesis of nanosized Ag/Co 3 O 4 composite catalysts using a silver-mirror reaction and the calibration of their catalytic activities towards methyl blue (MB) dye degradation with peroxymonosulfate (PMS) under visible light. The nanosized Ag/Co 3 O 4 composites were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–vis spectroscopy. The experimental evidence indicated that the hydrothermal synthesis approach lead to the exposure of the {1 1 2} facets of the Co 3 O 4 nanoflakes. Compared to Co 3 O 4 nanoflakes, Co 3 O 4 doped with Ag nanoparticle (average diameters of 10–15 nm) presented lower band gap energy and photoluminescent (PL) intensity. Meanwhile, the Ag/Co 3 O 4 exhibited high stability and excellent dispersion property in dye solution. Experimental data suggested that 3.06 wt% Ag nanoparticle-doped Ag/Co 3 O 4 nanocomposite catalyst possessed the highest catalytic activity towards MB degradation in aqueous solution at the tested concentration level of 15 mg/L, about 2.4 times higher than that of pure Co 3 O 4 . Complete decolorization of the 15 mg/L MB solution can be achieved by 3.06 wt% Ag-doped Ag/Co 3 O 4 nanocomposite within 20 min of visible light irradiation.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yongzheng Shi,Dongzhi Yang,Yuan Li,Jin Qu,Zhong-Zhen Yu
Although TiO 2 -based photocatalysts have exhibited a great potential for degradation of organic pollutants, it is still necessary to simultaneously enhance their visible-light-driven photocatalytic efficiency and physical recyclability. Herein, highly efficient, visible-light-driven photocatalytically active, and recyclable nanofibrous membranes with thin TiO 2 /Ag heterojunction layer are prepared using electrospun polyacrylonitrile (PAN) nanofibrous membrane as the substrate. By regulating the concentration and hydrolysis process of Ti precursors, TiO 2 nanoparticles steadily grow on the PAN nanofibers with high-specific surface area to form a continuous mesoporous shell with the thickness of 20 nm for efficient degradation of organic pollutants. Furthermore, to form a stable heterojunction structure, Ag nanoparticles are deposited on the TiO 2 surface by using dopamine as a binder and reductant. The presence of Ag nanoparticles leads to an obvious red-shift from 380 nm to 490 nm, which improves the utilization efficiency of visible light, and reduces the electron/hole recombination rate simultaneously. The resulting PAN@TiO 2 /Ag membranes hold enhanced photocatalytic activity for methylene blue degradation within 1 h under visible light irradiation, and satisfactory recyclability, which endow them with a great potential for adsorption and photocatalytic applications.
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RSC Advances
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2015
·Vol. 5
·期 124
·102610-102618
·
IF 3.84
Yufeng Shan,Yong Yang,Yanqin Cao,Zhengren Huang
Nanocomposites of noble metal and magnetic materials deliver both SERS activity and magnetic properties, and thereby have great advantages for trace analysis in the fields of analytical chemistry, biological and environmental sciences. In this work, Ag/Fe3O4 nanocomposites have been obtained by a facile one-pot solvothermal method. The Fe3O4 nanoparticles (NPs) compounded with Ag possess excellent superparamagnetism, which guarantees an effective self-aggregation of the Ag/Fe3O4 composites. The saturation magnetic moment and SERS activity of the as-prepared nanocomposites are easily optimized by adjusting the mole ratio of silver oleate and iron oleate. The sample with Ag/Fe = 5 possesses optimal SERS performance for both R6G and MB detection. The Fe3O4 NPs with ultra small size behave just like glue or a contractile net, which wrap the Ag NPs together under an external magnetic field and give rise to high-density and high-intensity “hot-spots”. The enhancement factors (EFs) of the sample with Ag/Fe = 5 are over ∼108 both for R6G and MB detection. The as-prepared magnetic nanocomposites have been applied to realize an efficient but convenient real-time on-line monitoring of atrazine in flowing pesticide contaminated water, which show enormous potential in the application of on-line monitoring for industrial and agricultural production.
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ACS Applied Polymer Materials
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2024
·
IF 4.4
Lan Yang,Junyu Zhao,Chengyang Wang,Ruotong Pang,Daming Wang,Xiaogang Zhao,Chunhai Chen
In recent years, polymer-based composites with high thermal conductivity have become important for the effective removal of accumulated heat in thermal management devices, though enhancing the thermal conductivity of poly(ether imide) materials remains challenging. Herein, to prepare high-thermal-conductivity materials, silver nanoparticles are chemically reduced onto the surface of graphite nanoplates as hybrid fillers. Consequently, inspired by “cellular structures”, segregated thermally conductive networks in composites are designed by mixing hybrid fillers and poly(ether imide) microspheres, followed by a hot-pressing process. Benefiting from the three-dimensional heat-transfer network and the bridging effect of silver nanoparticles, thermal conduction pathways are easily constructed, reducing interfacial heat resistance in the polymer matrix. At a hybrid filler loading of 40 wt %, the through-plane and in-plane thermal conductivities reach 4.7 and 11.3 W/m K, respectively. Moreover, the finite-element simulation reveals that the composites have high thermally conductive ability owing to the hybrid fillers, which offer highly effective pathways for phonon transmission. Besides, polymer composites exhibit a great electrical magnetic shielding performance (30.5 dB). In summary, this study provides a strategy for fabricating thermally conductive polymer-based composite materials for use in industrial heat dissipation devices.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Rui Liu,Bolin Wu,Rijia Liu,Xin Zhang,Yuan Sun,Jing Ma
The accurate and real-time detection of antibiotics in the complex mixtures remain a significant challenge in the clinical drug monitoring, the food safety and the environmental surveillance. In this study, we developed an innovative electrochemical sensor platform, i.e. Ag/ZIF-67/g-C 3 N 4 /GCE, combined with the assistance of machine learning for the detection of chloramphenicol (CHL) in the practice pharmaceutical and urine samples. The incorporation of machine learning into the sensor design represents a key advancement, enabling the intelligent analysis and the enhanced sensing performance. The Ag/ZIF-67/g-C 3 N 4 composite electrode exhibited remarkable electrochemical properties, including a broad linear detection range (0.01–250.00 μmol L −1 ) and an ultralow detection limit of 5.32 nmol L −1 . The sensor demonstrated excellent selectivity, reproducibility and stability, even in the complex sample matrices. For practical application, the developed sensor achieved high recovery rates (98.00–103.00 % in the pharmaceutical samples and 96.67–103.33 % in the urine samples) with the standard deviations below 2.56 % and 2.26 %, respectively. More importantly, the artificial neural network (ANN), specifically the backpropagation (BP) neural network, was applied to analyze the collected sensor data, successfully predicting and validating the CHL sensing efficiency. This study highlights the synergistic combination of the advanced materials and machine learning for the intelligent and the accurate detection of antibiotics, paving ways for the AI-powered electrochemical sensing platforms with potential applications in both health monitoring and real-world sample analysis.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanting Liu,Qiumei Li,Lili Meng,Qi Pang,Yanzhu Wang,Hua Yao,Qian Chen
Currently, lanthanide (Ln 3+ ) doped double perovskites (DPs) suffer from poor controllability of doping and the high concentration quenching phenomenon. Herein, a novel efficient energy transfer (ET) host of Cs 2 NaLuCl 6 Rare-earth-based (RE-based) DPs via Ag + /Bi 3+ co-doping for further Ho 3+ doping is developed. Benefiting from Ag + /Bi 3+ - manipulated the parity of the wavefunction of the self-trapped exciton, intense self-trapped excitons (STEs) broadband warm white visible emission is boosted. Specifically, photoluminescence quantum yield (PLQY) of co-doping with Bi 3+ and Ag + ions in Cs 2 NaLuCl 6 under 350 nm excitation is dramatically promoted to 86.19 % with half maximum (FWHM) of 224 nm. Although the pristine crystal Cs 2 NaLuCl 6 exhibits intrinsic blue emission with FWHM of 75 nm. Furthermore, the ET channel from STEs to Ho 3+ was constructed by tri-doping Ho 3+ , and the effective red and near-infrared (NIR) emission of Ho 3+ was obtained. Finally, NIR light-emitting diodes (LEDs) and white LED based on Ho 3+ doped/undoped Cs 2 Na 0.8 Ag 0.2 Lu 0.98 Bi 0.02 Cl 6 DPs were prepared with different application features. Specifically, white LEDs showed higher color rendering index and lower associated color temperature, while NIR LEDs showed good night vision imaging. This work provides a new strategy for the design of an ET host suitable for Ln 3+ doping, avoiding the effects of the concentration quenching phenomenon that always occurs in heavily doped hosts and realizing controllable doping.
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Nanoscale
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2025
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IF 5.1
Jiasheng Wang,Tianyu Zhang,Jiliang Song,Fengxin Zhang,Hong Liu,Wan-Hui Wang,Ming Bao
Unsaturated alcohols (UOLs) are important fine chemical intermediates. Thus, it is of great significance to design and prepare catalysts for highly selective hydrogenation of CO of α,β-unsaturated aldehydes (UALs). In this paper, a fluffy mesoporous Al2O3-supported Ag–In2O3 catalyst (Ag-In2O3/f-m-Al2O3) was synthesized by employing a two-solvent method, in which Ag and In2O3 form a Mott–Schottky junction and lead to electron transfer from In2O3 to Ag. Electron-rich Ag repels the CC bond owing to “four-electron repulsion”, and electron-deficient In2O3 acts as the electrophilic site to adsorb the O atom of the CO bond, thus improving the selectivity towards UOLs. In addition to a larger specific surface area and smaller mass transfer resistance, the fluffy mesopore Al2O3 exhibits a large number of Lewis acid sites, which can further improve UOL selectivity. With the help of Ag–In2O3/f-m-Al2O3, high UOL selectivity can be obtained from UALs containing aliphatic, aromatic and heterocyclic groups. This elaborate design of the catalyst could contribute to the highly selective hydrogenation of UALs to UOLs.
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PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Pan Tao,Yang Luo,Kai Zheng,Jing Cao,Li Zhu,Xunsi Wang,Wei Zhang,Shixun Dai,Qiushun Zou,Peiqing Zhang
Background Permethrin is a pesticide used to kill insects, and once used in excess, it poses a great threat to the environment and human health, therefore, it is necessary to realize the rapid and accurate detection of permethrin. Fiber optic surface enhanced Raman scattering (SERS) probes have the advantages of small volume and can be used for remote monitoring, which have great potential for application in achieving in-situ detection of pesticide residues. Results Fiber taper waist (FTW) SERS probes modified by silver nanocubes-graphene oxide (Ag NCs-GO) composite structures were prepared for in situ detection of permethrin in lake water. Evanescent wave was used to excite SERS signals from Ag NCs-GO composite substrates, which was designed to enhance signals through expanded excitation light-analyte contact area. Ag NCs can provide stronger hot spots, and GO further enhances the sensitivity of SERS through electron transfer and improves the stability of the detection. The detection limit of prepared FTW SERS probe for Rhodamine 6G (R6G) was calculated to be 8.5×10 -9 M and RSD were all below 5% using the drop-casting method. The in-situ detection limit of R6G and permethrin in water was tested to be 10 -6 M and 10 -5 M, respectively. Significance This work utilizes fiber optic evanescent waves to excite SERS signals, and adopts a special FTW structure and SERS substrates to achieve good performance. The synergistic enhancement of electromagnetism and chemistry is realized while increasing the contact area, which improves the sensitivity of in situ detection of the pesticide residue permethrin. It Promotes the application of fiber optic SERS sensors in pesticide residue detection.
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