Journal of Applied Spectroscopy
·
2024
·Vol. 91
·期 4
·903-911
·
IF 0.8
Zheng Zhiheng,Zhang Fan,Liu Yankun,Wang Zhiwu,Pei Yuan,Wu Zhengang,Li Bo,Wei Yingna,Chen Ying,Wei Hengyong,Li Jingwu
TiN–Ag@Ag composite substrates were prepared via ammonia reduction nitridation followed by electrochemical deposition. Fabricated TiN–Ag@Ag substrates were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and ultraviolet-visible spectrophotometry. The surface-enhanced Raman spectroscopy activity of these substrates was evaluated using ibuprofen as the probe molecule. The size of the Ag particles prepared via electrochemical deposition was approximately 1 μm, and Ag nanoparticles with an average particle size of 100 nm were uniformly distributed on the surface of TiN–Ag films. The Raman signal of ibuprofen was significantly enhanced, and the minimum detection concentration of ibuprofen was 10 –5 M. The mechanism by which the TiN–Ag@Ag composite substrate enhanced the Raman signals was analyzed using ultraviolet photoelectron spectroscopy and density functional theory implemented in the Gaussian software. Overall, charge transfer and the local electromagnetic field effect enhanced the Raman signals of ibuprofen.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 7
·4227-4243
·
IF 1.674
Deng Anquan,Zhu Yufu
TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres have been synthesized via a low-temperature hydrothermal method using SiO 2 spheres as templates, combined with a light-induced reduction method and a hydrogen peroxide oxidation process. Scanning electron microscopy, energy-dispersive X-ray and X-ray diffraction analyses have demonstrated that Ag and Ag 2 O nanoparticles were successfully deposited on the surfaces of TiO 2 /SiO 2 nanocomposite spheres and porous TiO 2 nanospheres forming nanoheterojunctions. The photocatalytic experiment results reveal that all the as-prepared catalysts possess improved photocatalytic activities compared with P25 nanoparticles. Both TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres exhibit excellent photocatalytic performances, which can be attributed to the synergistic effects of different kinds of nanoparticles. The synergistic mechanism of these nanoparticles is also discussed in detail.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yingjie Niu,Ziqi Wang,Yuan Li,Bichan Huang,Teng Ma,Xuanbo Jiang,Hui Cheng,Kaifu Zhang,Chenglin Yi
Lightweight and ultra-thin conformal shielding films can be directly integrated on the surfaces of complex structures without occupying additional three-dimensional (3D) space, holding considerable promise for protecting sensitive precision electronic equipment. Here, titanium carbide/silver (MXene/Ag) nanocomposites were synthesized through electrostatic adsorption and in-situ self-reduction, and subsequently combined with Ag ink to create a MXene/Ag-Ag hybrid ink optimized for aerosol jet printing (AJP). The introduce of ethylene glycol based solvent system largely prevents the aggregation of aerosolized hybrid ink particles and reduce the overspray as well. This hybrid ink exhibited a printing resolution of ∼ 10 μm and excellent electrical stability, with only a 4.8 % increase in resistance of the printed trace after 1000 bending cycles. The internal pores and heterogeneous interfaces of MXene/Ag formed after sintering process significantly enhanced the electromagnetic wave absorption of the film. The specific electromagnetic interference (EMI) shielding effectiveness (SE) (SSE/t, defined as the ratio of EMI SE to the density and thickness) of the MXene/Ag-Ag film reaches 52591.4 dB·cm 2 /g at a thickness of merely 500 nm with only 0.9 mg weight increment. Simultaneously, the successful fabrication of high-quality conformal films on various complex substrates showcases the advanced manufacturing capabilities of AJP. Moreover, the utilization of the shielding film in practical applications, including electric field shielding, wireless charging, and near-field communication (NFC) interruption, highlights the potential of AJP technology for the fabrication of integrated conformal EMI shielding electronics with custom-designed structures.
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IET Nanobiotechnology
·
2016
·Vol. 11
·期 2
·200-204
·
IF 1.541
Dan Zhu,Wenfeng Zhu,Weiwei Wang,Xiaoheng Liu
Aiming to monitor hydrogen peroxide and oxidizing ions in aqueous circumstance, functionalized attapulgite [i.e. gold-modified attapulgite nanocomposites (Au/ATP NCs)] as peroxidase mimics were prepared by loading β-cysteamine-capped gold nanoparticles onto attapulgite with the use of electrostatic interactions. As-prepared Au/ATP NCs were used for the detection of H 2 O 2 . The linear range and detection limit for H 2 O 2 were determined by quantitative experiments emerging excellent stability and recyclability. The peroxidase-like activity of Au/ATP NCs could be expanded for the detection of some oxidative ions (Fe 3+ and Ag + ) was also been discovered. Based on the absorption spectrum and steady-state kinetics, the mechanism for peroxidase mimic reaction is investigated. This work represents the first example of multitarget detection for molecule and cations (H 2 O 2 , Fe 3+ and Ag + ) using Au/ATP NCs as peroxidase enzyme mimics and holds a promise for future biomedical and analytical applications.
研究领域:
生物化学
·
分析化学
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TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Jingwei Wu,Faqiang Chen,Wanxin Wei,Yunfeng Su,Jingqing Zhang,Wei Yan,Guoqing Wei,Zhenjun Wang,Hengzhong Fan,Yongsheng Zhang
In response to the urgent demand for wide-temperature-range self-lubricating ceramics in demanding service environments, ZrO 2 -Ag-SrSO 4 composites with tailored Ag distributions were fabricated by oscillatory pressure sintering. The effects of Ag distribution (interface, matrix, lubricant phase) on the microstructure and tribological performance were investigated from room temperature (RT) to 1000 ℃. The results demonstrate that Ag and SrSO 4 can be incorporated into the ZrO 2 matrix, affecting interfacial bonding and frictional performance.The composite exhibits a low friction coefficient of 0.209–0.242 and a wear rate of (0.175–1.541) × 10 −5 mm 3 /(N·m). This is mainly attributed to Ag migration at low temperatures, Ag-SrSO 4 lubrication at medium temperatures, and formation of a SrSO 4 -Ag-NiO x tribofilm at 1000 ℃, enabling stable wide-temperature self-lubrication and providing high-performance tribological ceramic design.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Suhong Lu,Shuo Wang,Yewei Chen,Xinru Chen,Zhongtao Jiang,Chengyu Xu,Jurong Liu,Guilong Liu,Yuzhen Fang
Dumbbell-shaped α-MnO 2 hollow microspheres were synthesized via surface chemical oxidation of MnCO 3 microspheres using KMnO 4 , followed by removal of the residual MnCO 3 template with HCl. Subsequently, a series of Ag-modified α-MnO 2 catalysts with nominal loadings of m % Ag ( m = 0.05, 0.1, 0.3 and 0.5) were prepared through a redox etching process using H 2 O 2 . The strong interaction between highly dispersed Ag and the α-MnO 2 support was found to enhance the low-temperature reducibility and generate abundant active oxygen species. Furthermore, the presence of Ag increased the concentrations of Mn 2+ and Mn 3+ species, thereby facilitating the formation of oxygen vacancies. Simultaneously, the dynamic redox cycles between Ag + /Ag and Mn 4+ /Mn 3+ significantly improved oxygen mobility within the catalyst. These synergistic effects collectively contributed to the outstanding catalytic performance of the 0.3% Ag/α-MnO 2 , which achieved 75.8% HCHO conversion at 30 °C and reached complete conversion at 50 °C. In situ DRIFTS studies revealed that the addition of Ag into α-MnO 2 promoted the carbonate species qulickly converted into CO 2 and H 2 O. Both α-MnO 2 and 0.3% Ag/α-MnO 2 catalyst followed a similar reaction pathway of HCHO → DOM → HCOOH → H 2 CO 3 → CO 2 + H 2 O.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Da Wang,Ying Zhu,Weiting Yu,Zhiqiao He,Feilong Dong,Yi Shen,Tao Zeng,Xiaohui Lu,Jun Ma,Lizhang Wang,Shuang Song
Ag-based electrodes have emerged as important candidates for the industrial electrochemical CO 2 reduction reaction (eCO 2 RR) to form CO. Herein, an intrinsic versatile Ag electrode has been derived in situ from Ag-MOF on Ag foam (denoted as ER-AF), which exhibits the highest current density (57.2 mA cm −2 ) at a potential of −1.15 V vs. RHE reported to date for the formation of CO in a commonly used H-type cell. ER-AF has multiple-roles: The 3D dendrite structure promotes mass diffusion; the rich edges sites favor CO 2 adsorption and conversion, and the highly exposed (111) facet facilitates the desorption of CO. Their cooperating functions result in the remarkable performance of ER-AF in the eCO 2 RR to form CO. This work offers an effective strategy to achieve high eCO 2 RR activity and selectivity by assembling the active and stable sites together on the MOF-derived materials.
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RARE METALS
·
2021
·Vol. 41
·期 2
·630-638
·
IF 4.003
Qiu Jia-Jun,Yang Ting-Ting,Li Yi-Fan,Qian Wen-Hao,Liu Xuan-Yong
Although titanium and its alloys are extensively used in orthopedics and dentistry fields, implant failures still happen because of implant-associated infections. Herein, Au@Ag@Pt core–shell nanorods with noble metal combination were fabricated and assembled on medical titanium surface and the antibacterial activity and biocompatibility were investigated. The results showed that antibacterial rates of Ti–Au@Ag@Pt against S. epidermidis and P. aeruginosa were 89.7% and 92.7%, respectively. Besides, Ti–Au@Ag@Pt showed no obvious cell toxicity with MC3T3-E1 cells grew well on the sample surface. It was discovered that the Pt shell layer on Ti–Au@Ag@Pt slowed down the Ag ion release rate which endowed medical titanium surface with both antibacterial activity and good biocompatibility. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Shaofeng Zhang,Feng Ren,Wei Wu,Juan Zhou,Lingling Sun,Xiangheng Xiao,Changzhong Jiang
Composite photocatalysts that consist of semiconductor and noble metal nanostructures have been considered to be the promising and crucial materials for straightforward improving the efficiency in photocatalytic process and for the conversion of solar to chemical energy. In this work, we fabricated Ag-α-Fe 2 O 3 hybrid composites through a self-catalytic growth method by using the aldehyde-modified spindle α-Fe 2 O 3 nanoparticles (NPs) as supports. The size of supported Ag NPs can be directly controlled on the surface of α-Fe 2 O 3 . The morphology and structure of the resulting Ag-α-Fe 2 O 3 hybrid composites were studied by various techniques, including SEM, TEM, and XRD. The distinct photocatalytic behaviors were examined through the photodegradation of RhB dye. It was found that with the Ag NPs, the photocatalytic activities were enhanced greatly and the size of the Ag NPs played a crucial influence on the photocatalytic behaviors of the Ag-α-Fe 2 O 3 composites.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xin Zheng,Guanglei Li,Jingyi Zhang,Jie Zhang,Jian Yuan,Wenjing Yan,Peng Li,Changrui Xing
In this study, a planar benzothiazole Schiff base derivative ZX1 was designed and synthesized to selectively precipitate silver ions, in conjunction with the immunoassay detection of Hg 2+ ions. The silver chelation process was highly effective in the pH range of 7–10, with a silver ion precipitation ratio of 99.9 %. The coordination behavior of ZX1 with Ag + was studied using a series of spectroscopic measurements, topography analysis and DFT calculation. The shortest bond distances were 2.251 and 2.254 Å between nitrogen atom of thiazole and Ag + . Weak interactions were analyzed using the interaction region indicator (IRI) method and VMD. The immunoassay was developed through an anti-Hg 2+ /Ag + monoclonal antibody, which showed similar sensitivities for Ag + and Hg 2+ . The selectivity and anti-interference ability of the Schiff base ligands were tested for some hard metal ions and several anions. With co-existence of interference ion Ag + , Hg 2+ was detected in rice matrix solution with 77 %∼123.5 % recovery by addition of ZX1 as the masking reagent and 90.3 %∼115 % for wheat matrix. This research provides a promising immunoassay strategy for simultaneous detection of silver ions and mercury ions in food matrix by utilization of Schiff base ligands. This novel Schiff base ligand was then used as the pre-treatment reagent to remove silver ions within 5 min for detection of Hg 2+ or detection of both Ag + and Hg 2+ based on a novel bi-specific heavy metal antibody.
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CELLULOSE
·
2021
·Vol. 28
·期 3
·1715-1729
·
IF 5.044
Liu Hongyu,Yang Lin,Zhan Yifei,Lan Jianwu,Shang Jiaojiao,Zhou Mi,Lin Shaojian
In this work, a durable and sunlight-driven self-cleaning superhydrophobic cotton fabric was developed as a multifunctional oil/water separation material. First of all, Ag/AgCl was successfully deposited on the polydopamine modified cotton fabric surface by electrostatic adsorption, then the Ag/AgCl loaded fabric was coated by the polydimethylsiloxane (PDMS) via simple dip-coating method. The as-prepared cotton fabric (PDMS-Ag/AgCl@CF) presented the superhydrophobic property with water contact angle about 155°. Meanwhile, the prepared PDMS-Ag/AgCl@CF exhibited great tolerance and resistance to broad pH and various organic solvents, and it can also withstand 50 cycles of abrasion or 60 min of ultrasound treatment without an apparent decrease of superhydrophobicity, indicating its outstanding mechanical durability. As expected, this durable superhydrophobic fabric can availably separate various oil/water mixtures by gravity-driven force with high separation efficiency (over 97.8%), and it possessed good reusability. Additionally, the PDMS-Ag/AgCl@CF exhibited an outstanding self-cleaning performance under sunlight irradiation, due to visible light photocatalytic performance of Ag/AgCl. Finally, the resultant cotton fabric displayed good antibacterial activity. Therefore, in consideration of its prominent comprehensive performances, it is expected that the PDMS-Ag/AgCl@CF can be used as a promising material for oily water remediation.
研究领域:
材料科学
·
环境科学
·
光催化
·
抗菌材料
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CELLULOSE
·
2014
·Vol. 21
·期 6
·4557-4567
·
IF 3.033
Feng Jin,Shi Qingshan,Li Wenru,Shu Xiulin,Chen Aimei,Xie Xiaobao,Huang Xiaomo
In order to improve the antimicrobial activity of bacterial cellulose (BC), the silver nanoparticles (Ag NPs) were in situ fabricated on the BC membranes, affording BC and Ag hybrid antimicrobial materials, BC + Ag, which possesses excellent antimicrobial performance. Typically, carboxyl groups were firstly introduced into BC by TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation. Then, the carboxyl-functionalized BC was performed with ion-exchange reaction to change the sodium ions into Ag + by immersing in AgNO 3 aqueous solution, generating Ag + anchored BC. Finally, two types of distinct reductive reagents including NaBH 4 and sodium citrate were employed to transform Ag + into Ag NPs to fabricate BC + Ag. The diameters of Ag NPs were determined to be 3.8 nm for NaBH 4 -reduced BC + Ag, and 22.0 nm for sodium citrate-reduced one, respectively. The silver content of BC + Ag were determined to be 1.944 and 2.895 wt% for NaBH 4 -reduced sample and sodium citrate-reduced one, respectively. Two types of BC + Ag both showed a slow and persistent Ag + release profile, but the NaBH 4 -reduced one released much more Ag + than that of sodium citrate under the same measurement condition. In-depth antibacterial analysis via the disc diffusion and colony forming count method disclosed that BC + Ag exhibited strong bactericidal effects against both Escherichia coli and Staphylococcus aureus . And the antibacterial activity of NaBH 4 -reduced BC + Ag was higher than the sodium citrate-reduced one. Overall, this study would further improve the antibacterial efficiency of BC + Ag.
研究领域:
材料科学
·
微生物学
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