JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 10
·13777-13786
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IF 2.478
Liu Xiao,Wu Siyuan,Chen Baishan,Ma Yunzhu,Huang Yufeng,Tang Siwei,Liu Wensheng
As an important interconnection material in electronics, conductive silver paste has attracted much research interest in chip packaging and printed circuit board due to its predominant properties like high conductivity and flexible interconnection. In this paper, the silver nanoparticles, the silver sphere particles, and flake silver powders are fabricated by various methods. Different proportions of silver powder are selected to prepare micro-silver paste and micro-nano (mn) silver paste (fabricated by silver nanoparticles:sphere particles:flake silver powder = 1:1:1). Compared to traditional silver paste with high silver content (containing 80 wt% silver), paste in this work contains only 66.67 wt% silver. When the ratio of sphere particle to flake silver powder is 1:1, the electrical resistivity of micro-silver paste cured at 200 °C for 45 min in air is about (3.31 ± 0.73) × 10 −5 Ω cm, the resistance of silver paste rises a little bit after being folded by ten times. The addition of nano-silver particles can reduce the resistivity in lower temperature curing. The folding endurance of mn silver paste is comparable to that of micro-silver paste with sphere:flake = 1:1.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
·
2024
·
IF 4.9
Xilong Ding,Yunpeng Jiang
In this study, glass bubbles (GBs) and gallium-based liquid metal (LM) were combined at varying volume fraction ratios to prepare the composites (GB-LMs), with the objective of optimising their state of matter and overall properties. Furthermore, the incorporation of high thermal conductive particles, including copper and silver, was pursued in augmenting the thermal conductive efficiency of the resulting composites. The thermal conductivity (TC), electrical conductivity (EC) and density were measured in order to construct a comprehensive structure - property relationship, while the underlying microphysical mechanisms were elucidated through the numerical simulations based on the distinctive architectures observed. As the loading of LM droplets increases, the GB-LMs undergo a transition from a scattered state to a thick pasty state and then to a dilute gel state. The composite sample with a loading of 32 % LM droplets exhibited a moderate pasty state, with a TC of 4.7 W/(m·K), an EC of 380 S/m, and a density of 2.4 g/cm 3 . The introduction of copper or silver powders into the GB-LMs resulted in a TC of 8.0 W/(m·K), an EC of 1.59 × 10 4 S/m and a low density of 3.2 g/cm 3 . The incorporation of high TC particles into GB-LMs has the potential to markedly improve the TC-to-density ratio of the composite system. These findings facilitate the implementation of LM-based composites in the advanced thermal management.
研究领域:
材料科学
·
热管理工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 2
·445
·
IF 3.1
Xianglei Yu,Hu Sun,Zhuo Qian,Weichao Li,Wei Li,Fuchun Huang,Junpeng Li,Guoyou Gan
Silver powder, as the primary component of solar silver paste, significantly influences various aspects of the paste’s performance, including printing, sintering, and conductivity. This study reveals that, beyond the shape and size of the silver powders, their microstructure is a critical factor influencing the performance of both silver powders and silver pastes in solar cell applications. The growth process leads to the formation of either polycrystalline aggregated silver powder or crystal growth silver powder. Analyzing the performance characteristics of these different microstructures provides guidance for selecting silver powders for silver pastes at different sintering temperatures. Polycrystalline aggregated silver powder exhibits higher sintering activity, with a sintering initiation temperature around 450 °C. The resulting silver paste, sintered at 750 °C, demonstrates a low sheet resistance of 2.92 mΩ/sq and high adhesion of 2.13 N. This silver powder is suitable for formulating silver pastes with lower sintering temperatures. The solar cell electrode grid lines have a high aspect ratio of 0.37, showing poor uniformity. However, due to the high sintering activity of the silver powder, the glass layer dissolves and deposits more silver, resulting in excellent conductivity, a low contact resistance of the silver electrode, a low series resistance of the solar cell of 1.23 mΩ, and a high photoelectric conversion efficiency of 23.16%. Crystal growth silver powder exhibits the highest tap density of 5.52 g/cm3. The corresponding silver paste shows improved densification upon sintering, especially at 840 °C, yielding a sheet resistance of 2.56 mΩ/sq and adhesion of 3.05 N. This silver powder is suitable for formulating silver pastes with higher sintering temperatures. The solar cell electrode grid lines are uniform with the highest aspect ratio of 0.40, resulting in a smaller shading area, a high fill factor of 81.59%, and a slightly higher photoelectric conversion efficiency of 23.17% compared to the polycrystalline aggregated silver powder.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 10
·1-12
·
IF 2.8
Xue Tiange,Huang Zeya,Zhang Xiaotian,Meng Meng,Yu Shixiang,Chen Tian,Fu Renli
In this paper, the effects of the composition and sintering process of the conductive silver paste on the packaging and electrical interconnection performance of the silicon carbide high temperature pressure sensor are studied in detail. At the same time, a self-built high temperature reliability test platform is used to test the electrical interconnection reliability of the conductive silver paste under high temperature environments. The results show that flake silver powder can not only effectively promote the density of the conductive silver paste, but also improve the grain boundary migration behavior of the conductive silver paste, thereby improving the electromigration resistance of the sintered silver. The prepared conductive silver paste has good compatibility with high temperature pressure sensor materials such as SiC, AlN, and Pt, and the adhesion strength reach 23.12 MPa, 26.35 MPa, and 19.22 MPa, respectively. When the silver paste does not contain flake silver, the sheet resistance of the sintered silver paste is the lowest at 650 °C, which is only 2.58 mΩ/□, and there is still room for improvement. The high temperature stability test shows acceptable performance, but in the high current test with a current density of 125 A/mm 2 , the failure time is only 105 min. After adding 20 wt% of flake silver powder, the sheet resistance of the silver paste can be further reduced to 1.50 mΩ/□ by 41.9%, and the failure time can be extended to 158 min, with a 50.5% increase.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 10
·105001
·
IF 1.929
Lin Tang,Guoyou Gan,Xianglei Yu,Chengbin Liu,Junhua Cheng
Due to the high conductivity and stability of silver, silver ink has been widely used in the field of printed electronics. However, since mechanical strain would cause the contact between key particles to be broken. Recently, higher requirements have been put on the bending resistance of silver paste. In this experiment, by preparing Ag NPs: Ag Flakes composite materials of 20:80 and 30:70 respectively, a new method for preparing stable modified flake silver powder is proposed, and the attachment and growth methods of Ag NPs reduced on micron flake silver powder is discussed. Flake silver powder, dispersant and reducing agent are added to the silver-ammonia complex, and the nano-silver particles are reduced on the flake silver powder by controlling the reaction conditions. When Ag+: Ag Flakes in the solution is 30:70, there is a clear interface between the silver particles and the silver flakes, and the size distribution range is between 10 and 100 nm; when Ag+: Ag Flakes is 20:80, the distance between the nano-silver particles and the silver plate crystal plane is about 0.222 nm and 0.260 nm, these spacings represent the (1–12) and (004) planes of Ag, respectively. The reduced silver particles grow on the surface of the silver sheet, the size is about 5 ∼ 60 nm, and form a sheet-point combination of shaped silver powder, which can be used to make conductive silver paste with cost and performance competitiveness. The reaction can be completed at room temperature (5 ∼ 25 °C) and atmospheric pressure (80 ∼ 100 kPa), the operation is simple, the reaction time is short, and it has a positive effect on the commercial production of printable highly conductive silver paste.
研究领域:
材料科学
·
纳米技术
·
电子材料
✓ 已验证
DOI
高影响因子
International Journal of Materials Research
·
2021
·Vol. 112
·期 6
·457-464
·
IF 0.748
Dunying Deng,Zhaoyong Chen,Yongle Hu,Yonggang Tong,Xiubing Liang
Corrugated-surface silver powders were prepared for front contact pastes of silicon solar cells. The effects of using different pH controlling agents on the powder diameter, morphology, and conversion of silver ions to silver powders were investigated. Silver powders with wrinkled surface and 100% conversion were prepared, and ground by using spiral jet milling and tumbling ball milling, respectively. Silver powders ground by using spiral jet milling had better size distribution, higher tap density, and corrugated surface, the tap density of silver powders ground by using spiral jet milling was 6.52 g cm –3 . The silver powders were used to prepare front contact pastes of silicon solar cells, the aspect ratio of printed gridlines was 0.34.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 11
·8923-8932
·
IF 2.22
Su Yu,Zhang Lei,Liao Bing,Mai Yu L.,Dai Yong Q.,Hu Wei
For electrically conductive adhesives (ECAs), high electrical conductivity generally conflicts with excellent mechanical properties because electrical conductivity increases while desirable mechanical properties decrease with the increase in loading of conductive fillers or removal of lubricants on the silver filler surface. In this work, a method was developed to improve both the electrical conductivity and mechanical properties of the ECAs by introducing double bonds. Itaconic acid (IA) was used to replace the lubricant on the silver flake (Ag-F) surface, and acrylic acid (AA) was used as part of the ECA resin matrix. IA can replace the lubricant on the Ag-F surface, similar to other short-chain dibasic acids, to improve the ECA electrical conductivity. Furthermore, IA can be polymerized with AA to form covalent bonds between the silver flakes and the resin matrix, enhancing the mechanical properties of ECA. Compared with ECA filled with commercial silver flakes, the electrical conductivity of ECA filled with IA-treated silver flakes increased by ~ 21%, and the lap shear strength increased by ~ 29%.
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 Cleaner Production
·
2025
·
IF 10
Jianghao Chen,Shaoyi Huang,Shuiping Zhong,Wen Tan,Guangsheng Zeng,Wei Weng,Xiaopeng Chi
Conventional silver powder production routes, which reduce silver nitrate solution in the presence of a polymer protective agent, complicate subsequent powder cleaning and wastewater treatment. This study proposes a sulfate-based inorganic protective agent (utilizing Ag 2 SO 4 precursor replacement) that serves dual functions: morphology stabilization and wastewater treatment simplification. This innovation enables the environmentally friendly preparation of sub-micron spherical silver powder. The effects of peristaltic pump flow rate, pH value, temperature, concentration ratio of oxidant to reducing agent on the particle size and morphology of silver powder were systematically investigated. The resulting silver powder exhibited an average particle size of 0.64 ± 0.05 μm and excellent thermal stability (weight loss rate < 0.50 % up to 1000 °C). Mechanistic analysis via combined XRD, Zeta potential measurements, and density functional theory (DFT) calculations revealed that SO 4 2− preferentially adsorbs on Ag(111) facet via chemisorption. Moreover, the production wastewater can be directly treated biochemically after calcium oxide precipitation and air-stripping treatment. Furthermore, the scale-up experiment (single yield 50.0 g) showed that the performance of the experimental product was consistent with the lab-scale results, indicating that the process has good reproducibility.
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2025
·
IF 4.6
Wei Wang,Jia Liu,Yapeng Jia,Jun Yin,Lianzhou Zhang,Xuefei Zhou,Junpeng Li,Jianqiang Wang,Guoping Yang,Wenyan Zhang
Silver powder, as a pivotal material in electronics and new energy applications, critically depends on its tapped density and sintering activity. This study systematically optimizes the physical properties and sintering performance of micron silver powder through a synergistic surface modification strategy integrating jet milling classification and high-speed shear shaping. Results demonstrate that the modified silver powder exhibits a 40–45 % enhancement in tapped density (5.91 g/cm 3 ), a 50–56 % increase in apparent density (4.01 g/cm 3 ), a narrowed particle size distribution span (reduced from 2.93 to 0.52), and significantly improved flowability (angle of repose: 28.97°). The conductive silver paste formulated with modified powder achieves optimized rheological properties, including a 41.8 % higher 17-s recovery rate (84.5 %) and a 79.08 % reduction in static viscosity. Sintering experiments revealed that the modified silver powder achieved a maximum reduction in sintering temperature of 100 °C, with a relative density exceeding 97.3 % at 650 °C, with grain boundary diffusion and defect density modulation identified as the core mechanisms for densification. This work elucidates the synergistic regulatory mechanisms of surface modification on the sintering behavior of silver powders, aligning with the principles of tapped density enhancement and low-temperature sintering.
研究领域:
材料科学
·
电子材料
·
粉末冶金
·
表面工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·14368-14384
·
IF 2.478
Hu Yongcai,Du Zhaofu,Yao Yingbang,Ma Yue,Li Yi,Xu Yiwen,Zhao Xiaobo,Tao Tao,Liang Bo,Lu Shengguo
Silver powders were prepared by a chemical reduction method. Effects of different surfactants during this preparation process were examined. Using these silver powders, silver pastes were prepared for low temperature co-fired ceramics (LTCC) applications. Another batch of different surfactants were added into the silver paste and evaluated. Moreover, various organic thixotropic agents were used to modify the thixotropy behavior of the silver paste. It was found that the surfactants of PVP (Polyvinyl pyrrolidone, for preparation of the silver powder) and Span-85 (for the preparation of silver paste) exhibited the best performance, with an electrical resistivity of 0.11 mΩ mm. The silver paste with the thixotropic agent of hydrogenated castor oil shows the largest thixotropic index of 1.56. Using different organic additives, the microstructural, rheological and electrical properties of the silver paste can be considerably improved, and our results shed light on the optimization of the silver paste for LTCC applications.
研究领域:
材料科学
·
化学工程
·
电气工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 13
·7207-7217
·
IF 14.511
Chuanling Mu,Xue Wang,Zhiyuan Ma,Xiaohuan Liu,Wen Li
Flexible supercapacitors (SCs) are promising energy storage devices for wearable and soft technologies. However, efforts to achieve reliable performance during mechanical deformation have been unsuccessful owing the inevitable displacement and separation between electrode coatings and electrolytes or current collectors, which usually results in an increase of interfacial contact resistance. To address this challenge, we herein explored a kind of redox and conductive underwater adhesive as an electrode coating to improve interfacial adhesion and reduce the interfacial contact resistance. This kind of underwater adhesive, that merges the redox activity of heteropoly acids, the adhesion of aromatic amino acids and the conduction of silver powder into a single system, showcases collective advantages, such as exceptional adhesion to flexible substrates and electrolytes, adaptive and deformable features, conductivity, reversible redox behaviour and fast electron transfer/storage abilities. The all-in-one adhesives could be directly employed as both anode and cathode coatings for the convenient fabrication of a flexible supercapacitor. The capacitance retention of the flexible supercapacitor was found to be kept at 86% and 94% upon stretching and bending deformation, respectively. An electric watch can be easily lighted up by a serially flexible supercapacitor device, and the brightness of the electric watch remains unchanged during stretching and bending processes, indicative of outstanding reliability.
研究领域:
材料科学
·
电化学
·
能源存储
·
可穿戴技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Lefan Li,Tuanzhang Li,Pengfei Zhao,Jingyuan Guo,Chengpeng Li,Zhang Hu,Sidong Li,Chengyong Li
Continuous steam generation is still challenging for existing solar-powered interfacial evaporation systems due to insufficient sunlight exposure in overcast day and time from late afternoon to early morning. Here, we present a novel solar-afterglow driven interfacial evaporation system that leverages the effective absorption and thermal conversion stemming from the afterglow of strontium aluminate (SAO) and photothermal effects of the multi-walled carbon nanotubes/silver/polyacrylamide (MWCNTs/Ag/PAM). In virtue of these synergetic effects, this system demonstrates an evaporation rate of 2.91 kg·m −2 ·h −1 under one sun (1 kW m −2 ) in the daytime and an enhanced evaporation capacity of 5.61 kg·m −2 under SAO-induced afterglow overnight. This innovative strategy significantly broadens the utilizing solar energy and emitted fluorescence for continuous interfacial evaporation in seawater desalination.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 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）