Surfaces and Interfaces
·
2024
·
IF 5.7
Yuqing Xu,Beibei Cui,Xueqin Zhang,Ying Sun,Baoping Lin
The Cu@Ag core-shell particles are the highly anticipated functional materials in electronic applications which are required to be high electrical conductivity, good thermal properties and low cost. However, it remains a challenge to obtain a completely and uniformly coated Ag shell in low silver content. During the coating process, it is essential to regulate the reduction of Ag + on the surface of Cu to ensure uniformly silver shell. We developed a strategy to prepare uniformly coated Cu@Ag particles by employing hydroxy acids as complexing agents with “double-sided adhesive” function. Compared to conventional complexing agents, the employed hydroxy acids can not only coordinate with Ag + but also complex with Cu due to the more carboxyl and hydroxyl groups which act like a “double-sided adhesive”, that can pull Ag + to the surface of Cu, and then accomplish the coating of Ag with replacement and reduction reaction. The impact of different types of hydroxy acids as complexing agents on the coating effect of silver-clad copper powder was investigated when the silver addition was 15 %. Results indicated that the obtained Cu@Ag particles with tannic acid as complexing agent show high coating quality layer with low surface sliver content (11.4 %). Moreover, the obtained Cu@Ag particles exhibit good dispersibility, promising thermal stability and low electrical resistivity (30 μΩ·cm).
研究领域:
材料科学
·
电子应用
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 12
·8761-8770
·
IF 3.531
Yanhong Ji,Peng Miao,Ruonan Zhang,Quan Li,Yifan Zha,Fengying Dai,Xi Du,Benqiao He,Shaoyun Fu
Low silver contents are desirable for electrically conductive adhesives (ECAs) due to the high cost of silver. In the present work, micro-sized flower-like silver particles (MFSPs) with long and thin petals are prepared by a novel, green, and facile chemical reduction method in an aqueous solution. The effects of reactant mass ratio and reactant concentration are investigated to control the morphology and size of MFSPs. Three kinds of MFSPs with different sizes are filled into an epoxy resin to prepare novel ECA. Due to the easily formed conductive paths by such morphological silver particles, the as-prepared MFSP/epoxy composite adhesive has a low percolation threshold, a high conductivity, and high adhesion strength at a very low silver content. When considering the optimal combination of low electrical resistance and high adhesion strength, the MFSP obtained at the 1.5:1 ratio of ascorbic acid to silver nitrate is promising for preparing the ECA with a low Ag content of 30 wt% which is the lowest content for ECAs compared with the literature. The synthesis process of MFSPs has the advantages of mild condition, simple process, and environmental friendship. This study provides a new way to prepare highly conductive Ag/epoxy adhesives with low silver contents.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2017
·
IF 0
Jun Liu,Qingyong Tian,Zhaohui Wu,Weijing Yao,Xiangheng Xiao,Wei Wu
Trinary g-C 3 N 4 /Ag/Ag 3 PO 4 heterostructures with different Ag content were designed and synthesized by in situ deposition and reduction routes. The photocatalytic performances of these heterostructures were investigated under visible light (λ > 450 nm) and simulated sunlight. Moreover, the influence of Ag content and ratio of each component on the photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 was also studied. As a result, the photocatalytic activities of all these g-C 3 N 4 /Ag/Ag 3 PO 4 samples were higher than commercial P25 (TiO 2 ). Moreover, sample S1 (the ratio of g-C 3 N 4 , Ag 3 PO 4 and Ag is 1: 2.52: 0.12) showed the better photocatalytic activities than other g-C 3 N 4 /Ag/Ag 3 PO 4 samples (S2 and S3) and g-C 3 N 4 /Ag 3 PO 4 (1: 3) under the same light irradiation. It indicated that small amount of Ag nanoparticles could improve the photocatalytic performances by compared with g-C 3 N 4 /Ag 3 PO 4 sample. And S1 showed a stable photodegradation after 6 times of cycle experiments under simulated sunlight. The stable and significant superior photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 could be attributed to the fast charge separation among g-C 3 N 4 , Ag and Ag 3 PO 4 during the Z -scheme charge transfer and recombination process.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 21
·1-10
·
IF 2.8
Li Ali,Ruan Lvquan,Gao Yan,Zhang Yiyi,Zhang Xianhao,Chen Tengfei,Qiao Yu
With the rapid advancement of flexible and wearable electronics, there is an increasing demand for conductive inks that are low-cost, low-temperature processable, and high-performance. In this study, a particle-free conductive silver ink with a low silver content (22 wt%) was developed using silver acetate as the precursor. The influence of curing conditions on the performance of printed silver electrodes was systematically examined. The ink exhibits excellent low-temperature sintering capability, achieving high electrical conductivity with a resistivity as low as 4.8 × 10 –6 Ω m at temperatures below 100 °C, showing similar properties to those of high-temperature-processed commercial inks. Characterization techniques, including four-point probe measurements, scanning electron microscopy, and X-ray diffraction, revealed that the electrical conductivity of the silver electrodes is highly dependent on annealing temperature and dwell time. At 100 °C for 20 min, silver ions were reduced into continuous conductive networks, achieving a resistivity that, while higher than bulk silver, remains sufficiently low to meet the requirements of low-temperature electronic applications. Extending the annealing duration to 30 min further reduces the resistivity to 4.45 × 10 –6 Ω m. These findings provide both theoretical insights and practical reference for the low-cost manufacturing of flexible electronic applications, including wearable sensors, printed circuits, and bendable displays.
研究领域:
材料科学
·
电气工程
·
纳米技术
·
高分子科学
·
电子器件
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Di Li,Yanyan Gong,Minchen Du,Chao Bu,Cheng Chen,Somboon Chaemcheun,Jia Hu,Yongxing Zhang,Ye Yuan,Francis Verpoort
α-Hydroxy ketones are a series of biologically active fragments in nature as well as important synthons for organic chemistry. Herein, an AgOAc/1-ethyl-3-methylimidazolium acetate ionic liquid system was developed for the CO2-promoted hydration of propargylic alcohols and H2O to produce α-hydroxy ketones. Diverse desired products could be obtained in satisfactory yields under 1 bar of CO2 pressure with the catalysis of only a trace amount of silver (0.005–0.25 mol %), which is the lowest level ever reported for the metal-catalyzed systems. In particular, this system had robust recyclability, and it could be reused effectively at least 5 times. Furthermore, an unprecedented turnover number (TON) of 9200 was achieved, which is considered to be the highest TON ever reached for this hydration.
研究领域:
有机化学
·
催化
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
P. Ning,C.C. Liu,Y.J. Wang,X.Z. Li,R. Ranjithkumar,Z.H. Gan,Y.Y. Wu,T. Fu
Magnetic MnFe 2 O 4 nanoparticles containing 0, 1 and 3 at.% silver, respectively were synthesized by one-pot sol-gel method for antibacterial applications in biomedical fields. Material characterizations indicate that MnFe 2 O 4 begins crystallization at 134 °C and oxidation at 450 °C, the grain size and agglomeration degree increase with the silver content and silver exists as metallic state for the particles. The saturation magnetization decreases with the sintering temperature and slightly increases with the silver content, with the maximum of 50.0 emu/g obtained. Antibacterial tests by plate counting and PI-Hoechst 33342 staining suggest that the antibacterial activity of Ag–MnFe 2 O 4 nanoparticles is silver content-dependent. Silver ions concentration measurement, β-galactosidase activity assay and transmission electron microscopic observation show that the antibacterial activity is dominated by the actions of the released silver ions, rather than the membrane cell impairment or reactive oxygen species-induced oxidative stress mechanism. MC3T3-E1 cell test demonstrates the best cytocompatibility of the nanoparticles with 3 at.% silver, which is likely related to the reduced cell endocytosis of the aggregated particles. The combination of magnetism , antibacterial activity and biocompatibility would make Ag–MnFe 2 O 4 nanoparticles a potential multi-functional material in various biomedical applications.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）