COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Shuang Wu,Ting-yu Zhu,Zhu Zeng,De-xiang Sun,Jing-hui Yang,Xiao-dong Qi,Yong Wang
As electronic devices become more integrated into daily life, concerns about electromagnetic radiation pollution become more severe, despite the increased portability they offer. Designing a lightweight and multifunctional material that is environmentally friendly, thermally conductive, and electromagnetically shielded is urgently needed. In this work, novel composites were fabricated by incorporating Ag@MXene hybrid particles into the wood-based aerogel. Compared with the aerogels containing only Ag nanoparticles (AgNPs) or MXene , the Ag@MXene/W aerogel exhibited more homogeneous dispersion of unfolded MXene nanosheets and more AgNPs but higher porosity (97.1 %) and smaller density (0.047 g cm −3 ). Consequently, the Ag@MXene/W aerogel exhibited high compressibility and low energy dissipation, remarkable strain sensitivity, impressive electrical conductivity (33.9 S m −1 ) and specific electromagnetic shielding efficiency (5765.96 dB cm 2 g −1 ), and high thermal conductivity (0.81 W m −1 K −1 ). The excellent comprehensive performances ensure that the aerogel has wide applications in various fields, including electromagnetic pollution protection, strain detecting, and thermal management, etc.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Yuangong Ma,Youlin Huang,Wensheng Zhang,Zhishan Liang,Bo Ding,Dongfang Han,Dongxue Han,Li Niu
In the domain of photocatalysis, harnessing solar energy, particularly the near-infrared (NIR) spectrum, presents formidable challenges. To overcome these, a novel NIR-responsive photocatalyst, denoted as NYT@ZnO@RGO@Ag, was meticulously crafted. This photocatalyst comprises a NaYF4: Yb3+, Tm3+@ZnO structure supported on reduced graphene oxide (RGO) and further composited with silver nanoparticles. It was rigorously evaluated for its performance in photodegrading tetracycline (TC) antibiotics as a model compound. Leveraging the unique properties of upconversion materials, wide bandgap semiconductors, and localized surface plasmon resonance (LSPR), the NYT@ZnO@RGO@Ag catalyst exhibited an impressive photodegradation rate of 93.6% for TC under NIR light exposure. This efficiency surpassed that of NYT@ZnO (38.2%) and NYT@ZnO@RGO (72.3%). The remarkable enhancement in NIR-driven photocatalysis observed in NYT@ZnO@RGO@Ag is primarily attributed to the efficient process of fluorescence resonance energy transfer (FRET) from NYT to its each component. This process enhances photo-induced carrier generation and facilitates efficient transfer and energy utilization under NIR irradiation. The present study offers a promising approach for NIR-driven photocatalytic degradation of pollutants in environments with limited light exposure or even under dark conditions.
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Nanophotonics
·
2024
·Vol. 13
·期 3
·307-318
·
IF 6.5
Yang Jiao,Yuanyuan Pan,Moru Yang,Zhen Li,Jing Yu,Rong Fu,Baoyuan Man,Chao Zhang,Xiaofei Zhao
Hollow urchin-like substrates have been widely interested in the field of surface-enhanced Raman scattering (SERS) and photocatalysis. However, most reported studies are simple nanoscale urchin-like substrate with limited light trapping range and complicated preparation process. In this paper, a simple and effective controllable synthesis strategy based on micro-nano hierarchical urchin-like ZnO/Ag hollow spheres was prepared. Compared with the 2D structure and solid spheres, the 3D urchin-like ZnO/Ag hollow sphere has higher laser utilization and more exposed specific surface area due to its special hollow structure, which resulted in excellent SERS and photocatalytic performance, and successfully realize the detection and photodegradation of antibiotics. The limited of detection of metronidazole can reach as low as 10 −9 M, and degradation rate achieve 89 % within 120 min. The experimental and theoretical results confirm that the ZnO/Ag hollow spheres can be used in the development of ZnO heterostructure for the detection and degradation of antibiotics, which open new avenues for the development of novel ZnO-based substrate in SERS sensing and catalytic application to address environmental challenges.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yumin Guo,Meiran Chen,Yanjie Wang,Xianglong Lu,Jingjing Wu,Xin Tang
Zinc-air batteries (ZABs) are an emerging energy technology that is environmentally friendly and has a high theoretical energy density, but their commercial application is limited by the oxygen reduction reaction (ORR). Silver-based nanocatalysts can effectively improve the ORR performance. In this paper, a nanoporous Ag–Mn (NP-AM) electrocatalyst with bicontinuous ligaments was prepared by a combination of the melt-spinning technique and dealloying method. Theoretical calculations show that Mn-doped Ag(111) indicates a shift of the d-band center toward the Fermi energy level, which improves the adsorption energy of the OOH and thus reduces the overpotential of the decision step in the ORR process. Among them, the electrocatalyst NP-AM-5 reached a half-wave potential of 0.81 V (vs reversible hydrogen electrode (RHE)) with a limiting current density of −5.63 mA cm–2. Tests showed that its ORR process almost completely undergoes 4e– transfer with higher conversion efficiency and also exhibits better long-term stability in comparison to commercial Pt/C electrocatalysts. When used as the cathode of a zinc-air battery, the maximum power density reaches 140 mW cm–2. The discharge voltage can be maintained at about 1.2 V for a long period of time by discharging at a constant current of 10 mA cm–2, and the specific capacity is calculated to be 724 mAh g–1.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qingzhao Cai,Chengcheng Jiao,Junhao Wu,Shanqin Ge,Wei Li,Long Chen,Genxiang Gong,Jiamin Yu,Yaokang lv,Jinhong Yu,Kazuhito Nishimura,Nan Jiang,Tao Cai
Hybrid fillers show great advantages in improving the frictional properties of epoxy (EP) composites. However, to date, achieving ultra-low coefficients of friction and wear rates in self-lubricating EP systems through the use of nanofillers remains a challenge. In this study, the hard diamond nanosheets, soft silver nanoparticles, dopamine hydrochloride, and 1H,1H,2H,2H perfluorodecyltrichlorosilane (FDTS) were designed to prepare organofluorinated Ag/2D diamond nanocomposites (NDs-fPDA-Ag NPs). The tribological tests demonstrated that 3 wt% addition of NDs-fPDA-Ag NPs in EP exhibited the best friction reduction and anti-wear properties, which were reduced by 84.3 % and 98.6 % compared with pure EP. Significantly, it stands out as the sole instance reported to date that has successfully achieved the oil lubrication (average coefficient of friction 0.085 less than 0.1) in dry friction while maintaining ultra-low wear rate (4.9 × 10 -6 mm 3 /(N·m)). The superior lubrication effect is primarily attributed to three key factors: the high hardness of the two-dimensional (2D) diamond nanosheets, which provides exceptional wear resistance; the “rolling effect” generated by the zero-dimensional (0D) silver nanoparticles, which significantly reduces the friction coefficient; and the low surface energy of outermost grafted organofluorine compounds, which minimizes interactions between the NDs-fPDA-Ag NPs and the steel friction pair. The soft and hard combination of low surface energy 2D diamond greatly enhances the tribological performance of EP composites and provides a new approach for the preparation of excellent self-lubricating epoxy systems.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 9
·096505
·
IF 3.1
Zhefei Zhao,Linlin Zhang,Minghao Chen,Ruopeng Yu,Xuyao Yao,Yinghua Xu,Youqun Chu,Xinbiao Mao,Huajun Zheng
Electrochemical selective dechlorination can be regarded as one of the most promising strategies for generating high-valued chemicals. In the electrochemical dechlorination process of 2-chloro-5-trichloromethylpyridine (TCMP), except the anticipated dechlorination products involving 2-chloro-5-dichloromethylpyridine (DCMP), 2-chloro-5-chloromethylpyridine (CCMP), and 2-chloro-5-methylpyridine (CMP), some unexpected oxygen-incorporated products (6-chloronicotinic acid (CNA) and 6-chloronicotinoyl methyl ester (MCN)) can be obtained. Consequently, understanding the electrochemical dechlorination behavior of TCMP is crucial. Our research revealed that the activated Ag electrodes in halide ion solution exhibit enhanced electrochemical activities for electrochemical dechlorination of TCMP, compared with the pure Ag owing to the increased active specific surface areas and charge transfer. Second, oxygen participation in the reaction is a necessary condition for the formation of oxygen-incorporated products. A 100% selectivity of oxygen-incorporated products can be obtained at the potential of −0.6 V vs Ag/AgCl. Conversely, insufficient oxygen may lead to the potential becoming the determining condition that affects the reaction pathways. A more negative potential (−1.2 V vs Ag/AgCl) is conducive to the formation of dechlorination products with 94.2% conversion and 100% selectivity. This study, for the first time, elucidates the electrocatalyst, atmosphere, and potential-dependent activity and selectivity for the two dechlorination pathways of TCMP.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wenmin Yin,Long Wu,Fan Ding,Qin Li,Pan Wang,Jinjie Li,Zhicheng Lu,Heyou Han
To circumvent the limitations of natural antibodies, receptor, or enzyme, molecular imprinting technique has received intensive attention in analytical methods Herein, based on surface enhanced Raman scattering (SERS) molecularly imprinted polymer (SERS-MIP), a SERS-MIP sensor has been developed for the sensitive and selective detection of bisphenol A (BPA). To construct the BPA sensor, raspberry-type SiO 2 @Ag nanoparticles (SiO 2 @Ag NPs) were prepared to act as supporting substrate, and BPA was adopted as template molecule, tetraethyl orthosilicate (TEOS) as functional monomer and 3-aminopropyltriethoxysilane (APTES) as cross-linker. Due to the strong plasma resonance character of Ag NPs, the SERS-MIP sensor showed good sensitivity in the detection of BPA. The core-shell and satellite-like structure of the SiO 2 @Ag composites could provide a large surface area for BPA recognition by molecular binding domains. In addition, the sensor could prevent interferences such as 4,4′-(Hexafluoroisopropylidene) diphenol (BPAF) and 4,4′-Dihydroxybiphenyl (DOD). Moreover, the real water samples were tested to verify the reliability and feasibility of the method. Under the optimal conditions, the proposed method behaved good analytical performance to BPA with a wide linear range from 1.75 × 10 −11 to 1.75 × 10 −6 M and a detection limit of 1.46 × 10 −11 M.
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Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Meng Li,Zipeng Xing,Jiaojiao Jiang,Zhenzi Li,Junwei Yin,Junyan Kuang,Siyu Tan,Qi Zhu,Wei Zhou
A novel plasmonic Ag decorated S-TiO 2− x nanorods are successfully fabricated under 700 °C calcination, then followed by an in-situ solid-state chemical reduction approach with NaBH 4 in a mild calcination (350 °C) and combined with photo-deposition approach. The resultant Ag/S-TiO 2− x sample with high crystallinity and narrow band gap of ∼2.39 eV, extends the photoresponse to near-infrared region. The visible-light-driven photocatalytic degradation rate of phenol and hydrogen production rate for Ag/S-TiO 2− x nanorods are as high as 98.67% and 209.2 µmol h −1 g −1 , which is about 2 and 5 times higher than that of S-TiO 2 . Especially, first-order reaction rate constant of Ag/S-TiO 2− x nanorods is 14 times higher than that of S-TiO 2 . The excellent photocatalytic property can be attributed to the synergistic effect of Ti 3+ self-doping, S doping and the enhanced surface plasmon resonance of Ag nanoparticles, which narrows the band gap, favors the visible light utilization, and promotes the separation of photogenerated charge carriers.
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Journal of Environmental Chemical Engineering
·
2018
·
IF 0
Qingyong Li,Jiacheng Yao,Muhammad Arif,Ting Huang,Xiaoheng Liu,Guorong Duan,Xujie Yang
In this work, we first successfully designed and fabricated the ternary plasmonic Ag/β-Ag 2 WO 4 /WO 3 photocatalysts with different contents of Ag/β-Ag 2 WO 4 particles in situ decorated on the surface of WO 3 nanoplates by a simple precipitation method at room temperature condition. The photocatalytic activity of as-prepared samples was investigated by degradation of rhodamine B (RhB), methylene blue (MB) and methyl orange (MO) under visible-light irradiation. It was found that the prepared 40 wt% Ag/β-Ag 2 WO 4 /WO 3 photocatalyst showed the highest photocatalytic RhB efficiency with 83.21 and 86.83 times higher than those of pure WO 3 and Ag/β-Ag 2 WO 4 samples, respectively. The highly enhanced photocatalytic performance was attributed to the Z-scheme mechanism in this ternary composites, in which Ag particles play a crucial role by the surface plasmon resonance (SPR) effect; meanwhile, Ag particles also can work as the charge transmission-bridge, giving rise to effectively restraining recombination of the photogenerated charge carriers. This novel ternary Ag/β-Ag 2 WO 4 /WO 3 nanostructures may provide an appropriate insight in the consideration as an ideal candidate in environmental remediation.
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JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Dongliang Qian,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Water pollution has led to increased attention on wastewater treatment and renewable industries. Various materials have been developed for removing pollutants from water. However, materials capable of emulsion separation and soluble-contaminant degradation in a single step are rare. We report a TiO 2 /sulfonated graphene oxide/Ag nanoparticle (TSA) membrane, which possesses useful wettability and photocatalytic properties. A photocatalytic TiO 2 nanorod array-based mesh with favorable wettability properties is integrated with a sulfonated graphene oxide/Ag layer, to form a bifunctional TSA membrane. The membrane exhibits excellent oil/water separation performance, and efficient photodegradation of solubilized methylene blue under ultraviolet irradiation. The membrane also exhibits excellent stability and durability, with a water contact angle of > 150°, and a high separation efficiency after 10 consecutive cycles. The membrane therefore has potential in sewage and wastewater treatment.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Linlin Ren,Qiang Li,Jibao Lu,Xiaoliang Zeng,Rong Sun,Jianbo Wu,Jian-Bin Xu,Ching-Ping Wong
Polymer composites with high thermal conductivity have a great potential application in modern electronics, due to their light-weight, easy process, low cost and stable physical and chemical properties. Nevertheless, most polymer composites commonly possess unsatisfactory thermal conductivity, primarily because of the high interfacial thermal resistance between inorganic fillers. Herein, we report a novel method through silver-deposition on the surface of the fillers to create a silver nanoparticle “bridge”, to decrease the interfacial thermal resistance between fillers. The results demonstrate that the out-of-plane thermal conductivity of the epoxy resin/sphere alumina composites is increased to 1.304 W m −1 K −1 , representing an improvement of 624% compared with pure epoxy resin. This strategy provides an insight for the design of thermally conductive polymer composites with potential to be used in next-generation electronic packaging.
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NANOTECHNOLOGY
·
2017
·Vol. 29
·期 4
·044002
·
IF 3.44
Liang Huang,Chengpeng Jiao,Liqiong Wang,Zili Huang,Feng Liang,Simin Liu,Yuhua Wang,Haijun Zhang,Shaowei Zhang
ISOBAM-104 protected Rh/Ag bimetallic nanoparticles (NPs) with average diameter less than 3.0 nm were synthesized by a co-reduction method. Ultraviolet–visible spectroscopy, transmission electron microscopy (TEM), high-resolution TEM and x-ray photoelectron spectroscopy (XPS) were employed to characterize the structure, particle size, and electronic structure of the prepared bimetallic NPs. The catalytic activities of prepared bimetallic NPs for hydrogen generation from hydrolysis of a basic KBH4 solution were evaluated in detail. The results indicated that as-prepared Rh/Ag bimetallic NPs showed a higher catalytic activity than corresponding monometallic NPs. Among all the monometallic NPs and bimetallic NPs, Rh80Ag20 bimetallic NPs exhibited the highest catalytic activity with a value of 6010 mol-H2·h−1·mol-catalyst−1 at pH = 12 and 303 K. The high catalytic activities of Rh/Ag bimetallic NPs could be attributed to presence of negatively charged Rh atoms and positively charged Ag atoms, which is supported by the results of XPS and density functional theory calculation. Based on the kinetic study, the apparent activation energy for the hydrolysis reaction of the basic KBH4 solution catalyzed by Rh80Ag20 bimetallic NPs was about 47.0 ± 3.9 kJ mol−1.
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