JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 22
·9382-9393
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IF 4.5
Wang Bingying,Zhang Keke,Gao Yijie,Liu Peng,Liu Bo,Zhang Zhansheng
The trend toward miniaturized and highly integrated chip packaging has created a pressing need for lead-free solders with high strength, toughness, and conductivity. In this paper, we designed a scheme of Al 2 O 3 -modified nanomaterial-reinforced low silver Sn1.0Ag0.5Cu (SAC105) solder matrix. To begin with, a novel amorphous carbon and nickel core–shell structure plating modified on Al 2 O 3 (C/Ni/Al 2 O 3 ) were prepared by the electroless plating method. Then, the nano-C/Ni/Al 2 O 3 particle as reinforcement phase was mixed into the matrix solder alloy by ultrasonic vibration stirring. Finally, the morphology and relationship between coated carbon, deposited nickel and original solder interface were analyzed. The microstructure and main properties of the modified solders were also investigated. The experimental results suggested that amorphous carbon and nickel film were prepared on the surface of Al 2 O 3 by electroless plating method. The outer layer of nano-Al 2 O 3 was coated with non-uniform thickness of nickel and carbon coatings. The mass percentage of amorphous carbon was about 3.50%. Adding C/Ni/Al 2 O 3 (0–0.5%) into the SAC105 solder matrix resulted in a gradual increase in conductivity and wettability. The strength and toughness of the modified solder alloy improved as well with the adjunction of reinforced phase. The tensile fracture surface exhibited from a mixture of ductile and brittle, characterized by dimples and cleavage surface, to a purely ductile mode consisting mainly of dimples.
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NANOTECHNOLOGY
·
2019
·Vol. 30
·期 34
·345604
·
IF 3.399
Mengmeng Gao,Xiang Lin,Zhenghua Li,Xiaoxia Wang,Yebing Qiao,Haiyan Zhao,Jing Zhang,Li Wang
A highly sensitive and uniform three-dimensional (3D) surface-enhanced Raman spectroscopy (SERS) substrate has been fabricated by in situ ultraviolet ozone cleaning and layer-by-layer self-assembly. The SERS properties and the structural changes of the substrates were systematically studied by adjusting the cleaning time upon the in situ and post cleaning strategy. Under the optimal cleaning condition, the cleaning technology could give rise to clean and optimal surfaces for SERS analysis, thus obtaining efficient plasmonic films populated with a large number of homogeneous 'hot-spots'. Then with the optimal monolayer film, the SERS performance derived from plasmon coupling in multilayers of the Au@Ag nanocubes substrates was explored. It demonstrated that the plasmon coupling between layers (out-of-plane) contributed much to the SERS intensity, leading a more superior SERS enhancement from the 3D SERS substrates than that from the conventional two-dimensional SERS substrates. Also the in situ cleaning 3D SERS substrates displayed a nice uniformity and excellent time stability. With this method, the optimized substrates were further used to detect prohibited pigments in drink with an excellent linear relationship between characteristic peak intensity and analytes concentration over wide concentration ranges. Our experimental results clearly show that the in situ cleaning 3D SERS substrates provide an ideal candidate for SERS applications in food safety.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 9
·2466-2473
·
IF 5.256
Shaochen Zhou,Mei Zhang,Fangyuan Yang,Fu Wang,Chuanyi Wang
A facile and green synthetic route is developed to prepare water soluble, green-fluorescent Pt, Au, Ag and Cu quantum clusters (QCs), employing innoxious L-histidine as a capping agent. These metal QCs give out emissions at 455–495 nm, with maximum excitation wavelengths ranging between 350 and 401 nm. Interestingly, these histidine-stabilized metal quantum clusters also possess non-linear optical properties like two-photon luminescence, which is detected when they are exposed to a femtosecond laser at 812 nm. Luminescence quantum yields of Pt (2.93%), Au (13.10%), Ag (6.97%) and Cu (8.29%) clusters are found to be distinctly different, and lifetime measurement results suggest that the emissions of metal clusters (4.59–7.39 ns) stem from singlet transitions among different electron energy levels rather than metal–ligand electron transfer behaviors. The Pt, Au, Ag and Cu quantum clusters have average sizes of 1.3–1.9 nm, and are mainly composed of 11, 9, 4 and 7 metal atoms, respectively, according to the electrospray ionization mass spectrometry results. Moreover, the as-prepared metal clusters are sensitive to aqueous ferric ions, both as highly selective fluorescent and colorimetric probes in a low and wide concentration range, and are promising in many biological applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2017
·Vol. 28
·期 7
·1-11
·
IF 2.325
Cao Weiwei,Zhang Yu,Wang Xi,Chen Yinyan,Li Qiang,Xing Xiaodong,Xiao Yuhong,Peng Xuefeng,Ye Zhiwen
Abstract Research on the incorporation of cutting-edge nano-antibacterial agent for designing dental materials with potent and long-lasting antibacterial property is demanding and provoking work. In this study, a novel resin-based dental material containing photocurable core-shell AgBr/cationic polymer nanocomposite (AgBr/BHPVP) was designed and developed. The shell of polymerizable cationic polymer not only provided non-releasing antibacterial capability for dental resins, but also had the potential to polymerize with other methacrylate monomers and prevented nanoparticles from aggregating in the resin matrix. As a result, incorporation of AgBr/BHPVP nanocomposites did not adversely affect the flexural strength and modulus but greatly increased the Vicker’s hardness of resin disks. By continuing to release Ag + ions without the impact of anaerobic environment, resins containing AgBr/BHPVP nanoparticles are particularly suitable to combat anaerobic cariogenic bacteria. By reason of the combined bactericidal effect of the contact-killing cationic polymers and the releasing-killing Ag + ions, AgBr/BHPVP-containing resin disks had potent bactericidal activity against S. mutans . The long-lasting antibacterial activity was also achieved through the sustained release of Ag + ions due to the core-shell structure of the nanocomposites. The results of macrophage cytotoxicity showed that the cell viability of dental resins loading less than 1.0 wt% AgBr/BHPVP was close to that of neat resins. The AgBr/BHPVP-containing dental resin with dual bactericidal capability and long term antimicrobial effect is a promising material aimed at preventing second caries and prolonging the longevity of resin composite restorations. Graphical Abstract
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jing Sun,Yalei Mei,Weiliang Bai,Li Han,Yuqiang Li,Yuzhong Gao,Ming-Fei Lang,Hongsheng Xue
Flexible sheet reference electrodes play a crucial role in both flexible electrochemical biosensors and electrophysiological monitoring. Enhancing electrode stability and extending continuous operational lifespan are key issues in the research of flexible sheet reference electrodes. In this study, a novel flexible Ag/AgCl sheet reference electrode was fabricated by semi-embedding nano-silver dendrites within a polydimethylsiloxane (PDMS) matrix. The flexible Dendritic Ag/AgCl quasi-reference electrodes showed comparable stability of open circuit potential to commercial glass reference electrodes, with a single continuous stable operation time exceeding 12 h and sustained stable operation for at least 30 days when operated continuously for 1 h per day. Additionally, the shelf life was significantly extended to at least 1 year. An in-depth exploration of its mechanism reveals that the embedding strategy plays a crucial role. It strengthens the tight connections between silver dendrites, forming a robust and stable conductive network that ensures rapid and stable charge transfer. Furthermore, the strong adhesion between silver dendrites and PDMS greatly enhances its mechanical durability. This electrode exhibits high practical value in electrophysiological monitoring such as electroencephalogram and electrocardiogram, as well as in flexible sensor applications for H 2 O 2 sensing in pleural effusions, opening new pathways for advancements in flexible wearable devices and biomedical sensor technologies.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yansheng Liu,Zhenle Qin,Guofu Wang,Xiaobo Jia,Jin Zhou,Hongqi Li,Zhaoxu Li,Xiaohui Fang
Nanoplastic particles (NPPs) have attracted lots of attention due to their toxicity. In this study, a Surface-enhanced Raman scattering (SERS)-based category on selectivity and quantification detecting the polystyrene (PS) NPPs has been presented. Firstly, the size-dependent SERS relationship between the diameter of Ag nanocavities (AgNCAs) and the diameter of the PS NPPs is studied. By continuously dripping the PS NPPs on proposed AgNCAs substrates, AgNCAs exhibit excellent enrichment capability with a promoted limit of detection (LOD) of 0.001 mg/mL. Secondly, thermally evaporated Ag nanoparticles (AgNPs) as an enhancement layer are used to form the AgNPs/PS NPPs/AgNCAs sandwich structure with a SERS enhancement of 300 %. Thirdly, a SERS microfluidic chip constructed by integrating two kinds of pore size (87 nm and 356 nm) AgNCAs is fabricated to selectivity quantifying absolute concentration of the mixed PS NPPs with different diameters in a mixed solution. It shows excellent performance. This novel category proves a good method for identifying plastic nanoparticles and analyzing their size distribution existing in the surroundings indicating good practical applications.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Mingzhe Jiang,Min Wang,Wenjing Lai,Chenglin Hong,Xuetong Song,Siyu Chen
Mycotoxin contamination currently poses a significant concern and presents a major challenge to global food safety management. In this research, gold‑silver nanoclusters (Au-AgNCs) were utilized as platforms for electrogenerated chemiluminescence (ECL) and electrochemical (EC) responses, while polyaniline-coated cobalt tetraoxide and gold (PANI@Co 3 O 4 /AuNPs) served as bifunctional probes with intelligently modulated light/electric signals to develop a dual mode adaptor sensor for sensitive detection of alternariol (AOH). The sensor's benefits are evident in three areas:(1) Bandgap modulation allows Au-Ag to exhibit enhanced light/electric response;(2) PANI@Co 3 O 4 /AuNPs exhibit both ECL quenching effects and the capability to activate KHSO 5 , along with improved electrical conductivity, which collectively improves the sensor's detection performance;(3) The dual-channel signal outputs significantly reduce the risk of false detections. Testing results indicated that the ECL and EC sensors performed exceptionally well across AOH concentration ranges of 0.001–100 ng/mL and 0.01–1000 ng/mL, with detection limit of 0.803 pg/mL and 0.378 pg/mL, respectively.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jince Zhang,Xiaochen Qi,Yukun Chen,Yixiang Hu,Di Fang,Taiyu Jin,Jun Wang,Dawei Fang
In this study, hydrodynamic cavitation (HC) is used as a novel and simple large-scale preparation technique. Water-soluble CdSeS alloy quantum dots (QDs) were successfully prepared by using Cd(NO 3 ) 2 ·4H 2 O, Na 2 S·9H 2 O and selenium powder as cadmium, sulfur and selenium sources. The effects of cycle time, reaction temperature, inlet pressure and Se/S molar ratio on the morphology, size and optical properties of CdSeS QDs were investigated. The prepared CdSeS QDs were characterized by X-ray diffractometer, X-ray photoelectron spectroscopy, transmission electron microscopy, UV–vis absorption spectra, fluorescence emission spectra and fluorescence attenuation curves. Finally, under the conditions of 12 h cycle time, 3.0 bar inlet pressure, 60 °C reaction temperature and 0.5/0.5 Se/S molar ratio, the ternary alloy CdSeS QDs with 2.62 nm average particle size and 482.62 ns fluorescence lifetime was obtained. Furthermore, a mechanism of preparing CdSeS QDs by using the HC method was proposed to explain the process of CdSeS precipitates conversion to CdSeS QDs. In addition, it is also found that Ag + has a quenching effect on the prepared CdSeS QDs, which means that CdSeS QDs can be used as a fluorescence probe to specifically detect Ag + . This work not only provides a new possibility for large-scale preparation of high-performance QDs but also helps to understand the mechanism of CdSeS QDs as a metal ion selective fluorescence probe.
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Catalysis Science & Technology
·
2024
·Vol. 14
·期 22
·6621-6640
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IF 4.4
Bin Guan,Junyan Chen,Zhongqi Zhuang,Zhan Gao,Zeren Ma,Xuehan Hu,Chenyu Zhu,Sikai Zhao,Kaiyou Shu,Hongtao Dang,Tiankui Zhu,Zhen Huang
As a promising future energy material, g-C3N4 as a CO2 photo-thermal-reduction catalyst can effectively convert CO2 to renewable fuel, but the low yield and low product selectivity significantly limit its further development and application. Herein, Ag and Bi2MoO6 were loaded separately or together on g-C3N4 catalysts by photo-deposition and solvothermal synthesis methods, wherein the conversion efficiency of the g-C3N4 catalyst co-loaded with 0.5% Ag and 10% Bi2MoO6 was the highest (CO yield = 50.77 μmol g−1 h−1, CO selectivity = 96.98%). Characterization shows that the co-loading of Ag and Bi2MoO6 reduces the band gap of g-C3N4, improves the light absorption performance, and promotes the photoelectron transfer and CO2 adsorption, which may be attributed to the LSPR of Ag and the Z-scheme heterojunction between g-C3N4 and Bi2MoO6. The results of in situ DRIFTS and DFT calculations are consistent with the above conclusion and show that Ag loading effectively reduces the energy barrier of each intermediate state. This thesis aims to provide data support and theoretical guidance for optimal design of g-C3N4 catalysts.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Guanwen Su,Yue Liu,Yulin Hou,Rui Zhang,Wei Wang,Jie Zhang,Leping Dang
A core–shell–shell sandwich material is developed with silver nanowires as the core, ZIF-8 as an inner shell, and gold nanoparticles as the outer shell, namely, Ag@ZIF-8@Au nanowires (AZA-NW). Then, the synthesized AZA-NW is transformed into a surface-enhanced Raman spectroscopy (SERS) sensor (named M-AZA) by the vacuum filtration method and used to enrich, detect, and inactivate traces of bacteria in the environment. The M-AZA sensor has three main functions: (1) trace bacteria are effectively enriched, with an enrichment efficiency of 91.4%; (2) ultrasensitive detection of trace bacteria is realized, with a minimum detectable concentration of 1 × 101 CFU/mL; (3) bacteria are effectively killed up to 92.4%. The shell thickness of ZIF-8 (5–75 nm) is controlled by adjusting the synthesis conditions. At an optimum shell thickness of 15 nm, the effect of gold nanoparticles and ZIF-8 shell on the sensor’s stability, SERS activity, and antibacterial performance is investigated. The simulation of the SERS sensor using the finite difference time domain (FDTD) method is consistent with the experimental results, theoretically demonstrating the role of the gold nanoparticles and the ZIF-8 shell. The sensor also shows excellent stability, safety, and generalizability. The campus water sample is then tested on-site by the M-AZA SERS sensor, indicating its potential for practical applications.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Wen-Jing Chen,Xiao-Qing Liu,Shun Zhang,Hong Jiang
The synthesis of new surface-enhanced Raman scattering (SERS) substrates for the detection of trace poisonous organic pollutants is important for environmental monitoring. Herein, we designed and prepared monodispersed and uniform Ag NPs anchored on silica microspheres (Ag@ASMs) by the orientation of grafted amino groups and applied it as a SERS substrate for the detection of ultralow concentrations of poisonous organic pollutants (Rhodamine 6G (R6G), crystal violet (CV), and melamine) with high sensitivity and reproducibility in aqueous solution. A ratio of 2:1 Ag@ASMs exhibited optimum SERS performance, allowing the detection of 10–12 M of R6G with an enhancement factor of 6.36 × 107 (collect the normal Raman signal based on 10–4 M R6G) as well as 10–8 M of CV and melamine. The density functional theory calculation also provided evidence that modified 3-triethoxysilylpropylamine molecules are interspaced, and the optimum Ag dosage further tuned the gap between Ag NPs as well as the size of Ag NPs. This approach can suggest new ideas for the design and synthesis of other improved SERS-active substrates.
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JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Lu Huang,Haiyun Zhai,Guohuan Liang,Zihao Su,Kaisong Yuan,Guoqiang Lu,Yufang Pan
An analytical technique for selective, simultaneous determination of bisphenol A (BPA) and nonyl phenol (NP) in fish samples was established by a solid-phase extraction chip integrated with array columns of dual-molecularly imprinted polymer-coated silver-modified graphene oxide (Ag/GO-dual-MISPE-chip). Ag/GO dual-molecularly imprinted polymers (Ag/GO-dual-MIPs) were synthesized by in situ polymerization using Ag/GO as the supporting matrix which extracted templates easily. The affinity and specificity on the Ag/GO-dual-MISPE monolithic column were also investigated. The array extraction chip showed high binding capacity and selectivity to BPA and NP, with the imprinting factors of BPA and NP reaching 2.6 and 2.9, respectively. Ag/GO-dual-MIPs were characterized by scanning electron microscopy and Fourier transform-infrared (FT-IR) spectroscopy. As Low as 2.4 ng L −1 BPA and 4.7 ng L −1 NP were detected by high performance liquid chromatography coupled with fluorescence detection. The enrichment factor was 113-fold for BPA and 92-fold for NP. Therefore, the chip-based array columns are feasibly applicable to facile extraction of BPA and NP and effective clean-up of impurities in fish samples.
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