JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 11
·1-12
·
IF 2.533
Shen Xingwang,Xi Shuang,Xu Liang,Zhao Tao,Sun Rong,Li Junjie
A rising variety of power devices based on wide-bandgap (WBG) semiconductors are employed in products that can service at high temperatures consistently for extending the working life. Traditional tin–lead and lead-free solders are no longer suitable for power device packaging. Recently, nano-Ag pressureless sintering technology has attracted widespread attention for high-temperature application. When commercial Ag powders are applied, satisfactory sintering quality is often not obtained due to unstable product batches, unknown surface cladding, and poor sintering performance. In this work, Ag nanoparticles are surface modified with tert-dodecyl mercaptan (TDM) to prevent agglomeration at room temperature for improving pressureless sintering performance. We systematically introduced the modification process of Ag nanoparticles and Ag paste preparation and sintering process and compared the changes in the sintering performance of modified Ag nanoparticles with different TDM contents. With a minor amount of TDM, 1.5% of the total weight of Ag, the sintering performance of the Ag paste can be effectively improved and the porosity reduced. The highest average shear strength of the bonded joints based on modified Ag nanoparticles is up to 46.82 MPa with only 6.1% porosity by pressureless and low-temperature sinter at 250 °C for 10 min in ambient air, and the sintering morphology is better than the joints without nanoparticle modification. At the same time, increasing the sintering time does not have much effect on the bond strength, which indicated that 10 min already formed a high-quality joint. The analysis reveals that TDM molecules can be absorbed on the surface of Ag nanoparticles by headgroups to form a coating layer. The mechanism of TDM modification to enhance the sintering performance is also proposed, which provides theoretical support for the practical application of the pressureless Ag sintering technology. Graphical abstract
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Chuncheng Wang,Hiroaki Tatsumi,Liang Xu,Tao Zhao,Pengli Zhu,Rong Sun,Hiroshi Nishikawa
Simplifying the bonding technique used to package power devices is crucial for electric vehicles and 5G communication. Herein, a transparent liquid Ag-based complex was employed to simplify the Ag sintering process. The complex can directly fabricate Ag nanostructures on substrates and dies by thermal decomposition at 180 °C for 30 min. These nanostructures consisted of linked nanoparticles with a wide size distribution and exhibited remarkable compressibility, indicating an excellent potential for sintering. Unlike traditional Ag paste, the Ag-based complex presented a single phase, and the obtained Ag nanostructures could be directly sintered at a low temperature. Robust sintered Ag joints with a high average shear strength of 45.4 MPa and a low porosity of 9.3% were successfully achieved by sintering at 300 °C and 5 MPa for 40 min. Such joint properties can be attributed to the frame–filler structure generated during sintering. This structure, which featured large Ag particles acting as frames and small Ag particles acting as bridges linking the frames, was beneficial for improving the sintering performance of the Ag nanostructures. The Ag-based complex could be used for the facile preparation of robust sintered Ag joints, creating possibilities for die attachment while reducing manufacturing costs.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 12
·125601
·
IF 3.551
Qianyun Bin,Min Wang,Lishi Wang
In this work, silver nanoparticles (Ag NPs) were decorated into the cavities of ZIF-8 to fabricate a novel Ag NPs/ZIF-8 modified glassy carbon electrode (GCE) for electrochemical sensing of chloride ion. Benefiting from the synergistic properties of ZIF-8 and Ag NPs, the Ag NPs/ZIF-8/GCE showed favorable performance towards chloride ion. For comparison, the electrochemical activity of Ag NPs wrapped by ZIF-8 (Ag NPs@ZIF-8) and Ag NPs coating on ZIF-8 (Ag NPs-on-ZIF-8) were also investigated and it was found that Ag NPs/ZIF-8 possessed the best performance. Some experimental parameters including pH of the supporting electrolyte and scan rate were also investigated. Under optimal conditions, the proposed sensor exhibited excellent stability, reproducibility and selectivity for the determination of chloride ion with a wide linear detection range from 5 to 4000 μmol dm−3 and a low detection limit of 0.61 μmol dm−3 (S/N = 3). The proposed sensor was successfully applied to the determination of chloride ion spiked in human serum. All these results indicated that the developed Ag NPs/ZIF-8/GCE sensor was superior.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Ling Zhou,Xiaojun Wen,Yuanzhi Min,Jiafeng He,Lijun You,Jumei Li
In situ and real time monitoring chemical reactions has been subjected to widespread concern in many areas. Herein, a novel and efficient SERS platform constructed from coating mesoporous ZrO 2 (mZrO 2 ) interlayer onto an Ag core and subsequently depositing outer Ag nanoparticles was successfully fabricated. The Ag@mZrO 2 @Ag nanocomposite exhibited an ultrahigh SERS sensitivity as well as remarkably photocatalytic property assisted by a plenty of Ag nanoparticles on the outer surface and photoactive mZrO 2. Experimental results proved the limit of detection of Cr(VI) was down to 10 −8 M and the good linearity dependence of SERS intensities on the logarithm of concentration (R 2 = 0.93) was obtained. Moreover, a simple SERS method was used to in situ monitor the photocatalytic reduction of Cr(VI) under visible light (λ > 420 nm). In addition, as practical SERS substrates, Ag@mZrO 2 @Ag nanocomposites presented outstanding signal reproducibility and remarkable storing stability. As a consequent, this study came up with a new strategy for in situ monitoring photocatalytic reactions and will be possibly utilized in chemical sensing and ecological restoration in the future.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Ling Zhang,Yiquan Xie,Yiwen Jiang,Yaobin Li,Chunying Wang,Shichao Han,Huimin Luan,Xiangju Meng,Feng-Shou Xiao
Catalytic combustion at low temperature has been considered as an effective route for removal of indoor HCHO pollutant, and conventional catalysts are supported noble metal nanoparticles, which are costly for wide applications. Solution of this issue is to use relatively low metal catalysts. Herein, we report that Mn-promoted Ag catalyst supported on pure silica Beta zeolite with a good hydrophobicity is very active for catalytic combustion of HCHO. By optimizing the loadings of Ag and Mn, it is found that 10 wt% Ag with 8 wt% Mn (10 %Ag8 %Mn/Beta-Si) exhibits highest activity, giving the complete HCHO conversion at around 45 °C, which steadily outperform the temperatures (70–145 °C) for full oxidation of HCHO reported previously. The choice of Ag loading with 10 wt.% is due to the highest exposed surface of Ag sites, and the use of Mn loading with 8 wt% is assigned to the balance of density and mobility for active oxygen species in the catalysts. The strategy combining the hydrophobic supports with optimized active oxygen species might offer an alternative way to develop highly efficient heterogeneous catalysts for the removal of air pollutants in the future.
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Jian Zhu,Zai-jie Xu,Guo-jun Weng,Jing Zhao,Jian-jun Li,Jun-wu Zhao
In this report, Ag-dielectric-Au three-layered nanoshells with controlled inner core size were synthesized. The fluorescence emission of the rhodamine 6G (R6G) could be quenched by the three-layered nanoshells distinctly. What's more, the fluorescence quenching efficiency could be further improved by tuning the etching of inner Ag nanosphere . The maximum fluorescence quenching efficiency is obtained when the separate layer just appears between the inner Ag core and the outer Au shell. Whereas the fluorescence quenching efficiency is weakened when no gaps take place around the inner Ag core or the separate layer is too thick and greater than 13 nm. The fluorescence quenching properties of the Ag-dielectric-Au three-layered nanoshells with different initial sizes of the Ag nanoparticles are also studied. The maximum fluorescence quenching efficiency is obtained when the three-layered nanoshells are synthesized based on the Ag nanoparticles with 60 nm, which is better than others two sizes (42 and 79 nm). Thus we believe that the size of initial Ag nanospheres also greatly affects the optimized fluorescence quenching efficiency. These results about fluorescence quenching properties of Ag-dielectric-Au three-layered nanoshells present a potential for design and fabrication of fluorescence nanosensors based on tuning the geometry of the inner core and the separate layer.
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 5
·4528-4533
·
IF 3.277
Wan Li,Xiaoping Zeng,Hong Wang,Qin Wang,Yajiang Yang
Glutathione–Ag (GSH–Ag) supramolecular hydrogels have almost no mechanical strength, and the disassembly of GSH–Ag complexes occurs very easily under UV irradiation. In this work, low molecular weight polyvinyl alcohol (PVA) was used to reinforce GSH–Ag gels. The phase transition temperature of GSH–Ag gels can be increased from 45 to 60 °C in the presence of only 0.8 wt% of PVA. Rheological studies indicated that the storage modulus of reinforced GSH–Ag gels was 6 times higher than that of unreinforced gels. SEM studies revealed that the macromolecular chains of PVA are intertwined with the GSH–Ag aggregates, leading to an increase of mechanical strength. The TEM studies and UV-vis spectra indicated that Ag+ within the GSH–Ag gels was in situ reduced to form Ag nanoparticles under UV irradiation. Meanwhile, gradual disassembly of GSH–Ag hydrogels can be induced through controlling the time of UV irradiation. Based on this feature, the controllable release of a loaded model drug (crystal violet) and Ag species can be realized from the reinforced GSH–Ag gels. The release media show a good inhibition effect on E. coli.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Lin Huang,Maoqing Chen,Ying Yang,Qingshou Zheng,Li Gu,Ruobing Cheng,Xuebo Cao
Electro-reforming of organics such as alcohols into commodity chemicals and H 2 powered by renewables is intriguing and prevailing with the remarkable renaissance of electrochemical technology. Integrating Pt/Pd with an auxiliary metal, metal oxide, and metal hydroxide are feasible strategies to design the desirable catalysts toward alcohols electro-oxidation reactions. These catalysts however have high affinity toward carbonyl intermediates that occupy and poison the active sites. Thus, the target products suffer from poor selectivity. To address these issues, a facile binary Pt–Ag alloy nanowires (NWs) catalytic system was reported for efficient electro-oxidative reforming of ethylene glycol (EG), yielding glycolate with a selectivity of 91.5 %, an EG conversion of 96.4 %, and Faradaic efficiency (FE) of 87.4 %. Experimental and theoretical investigations revealed that Ag-induced electronic structure perturbations in Pt 0.66 Ag catalyst boosted the kinetics and robustness as a conventional promoter toward EG electro-oxidation reaction (EGOR). Moreover, the one-electron oxidation of water/hydroxide ion to generate abundant hydroxyl adspecies (OH ad ) on Ag served as another crucial promoter for efficient dehydrogenation, glycolate formation, and carbonyl intermediates release via a highly efficient, noncompetitive Langmuir–Hinshelwood (L–H) mechanism, but not the competitive L–H mechanism or the Eley–Rideal (E–R) mechanism. These findings provide new insights into the selective alcohol electro-oxidation reaction, and facilitate the generation of commodity chemicals via partial electro-oxidation reactions.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yingjie Niu,Ziqi Wang,Zhenxiang Xiong,Yuanyuan Tan,Zhijian Meng,Dejin Yan,Hui Cheng,Chenglin Yi,Kaifu Zhang
Temperature sensors play a vital role in fields such as food safety, medical diagnostics, and aerospace. However, the development of conformal temperature sensors with high sensitivity, low cost, broad detection range, and reliable performance under extreme conditions remains a significant challenge due to limitations in materials and fabrication technologies. In this study, we synthesized titanium carbide/silver (MXene/Ag) nanocomposites through electrostatic adsorption and in-situ self-reduction, and formulated a hybrid ink suitable for aerosol jet printing (AJP). The MXene/Ag-Ag-0.28 % ink, prepared with the optimal MXene/Ag and Ag mass ratio, demonstrated outstanding printability with a resolution of up to 10 μm, along with excellent electrical conductivity and mechanical durability. The printed traces achieved a conductivity as high as 2.32 × 10 7 S/m, representing a 56 % improvement over traces printed with Ag ink. Furthermore, the resistance of the printed traces changed by only 2.8 % after 1000 bending cycles, which is 3.22 times more stable than Ag traces. In addition, the printed sensors exhibited a wide temperature detection range from −50 °C to 270 °C, with a response delay as short as 90 ms and a temperature coefficient of resistance (TCR) as high as 3.03 × 10 −3 /°C at 30 °C, which is 24 % higher than that of pure Ag ink. The sensor also demonstrated reliable responsiveness under extreme conditions such as open flame and exposure to liquid nitrogen. Moreover, high-quality conformal temperature sensors were successfully fabricated on a variety of complex curved surfaces, highlighting the advanced manufacturing capabilities of AJP. Notably, conformal sensors were also integrated onto the surface of a turning tool for real-time temperature monitoring during the machining of carbon fiber reinforced polymer (CFRP). These results offer valuable insights into the potential of AJP technology for fabricating high-performance, conformal electronic sensors.
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高影响因子
OPTICS EXPRESS
·
2024
·Vol. 32
·期 6
·9276-9286
·
IF 3.2
Shuya Ning,Shuya Ning,Zhihui Liu,Shuo Wang,Naming Zhang,Bin Yang,Xin Wang,Fanghui Zhang
All-inorganic halide perovskite quantum dots (QDs) have recently received much attention due to their excellent optoelectronic properties. And their emission properties still need to be improved for further applications. Here, we demonstrated a remarkable emission enhancement of the CsPbBr3 QDs based on an Ag nanoparticle-Ag film plasmonic coupling structure. Through precise control of the gap distance between Ag nanoparticle and Ag film, the localized surface plasmon resonance (LSPR) peak was tuned to match the emission wavelength of the CsPbBr3 QDs. We achieved a 30-fold fluorescence intensity enhancement and a lower lasing threshold, which is 25% of that of the CsPbBr3 QDs without plasmonic coupling structure. It is attributed to that the plasmonic coupling structure exhibits an extremely strong local electric field owing to the coupling between LSPR of Ag nanoparticle and surface plasmon polariton of Ag film. This work provides an effective way to enhance the optical emission of perovskite QDs and promotes the further exploration of on-chip light source.
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DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Yingjie Niu,Ziqi Wang,Biqi Yang,Hui Cheng,Ao Li,Yuanyuan Tan,Linbo Bian,Chenglin Yi,Kaifu Zhang
Temperature sensors are widely used in daily life and industry. Developing low-cost, scalable, high-sensitivity conformal temperature sensors with a broad detection range is highly desirable. In this study, we prepared a hybrid functional ink composed of silver nanoparticles (Ag NPs) and silver nanowires (Ag NWs) via physically mixing for aerosol jet printing (AJP). The resulting Ag NPs/Ag NWs-0.5% ink exhibited a fine printing resolution of 10 µm and excellent conductivity up to 1.95 × 10 7 S/m. After 1000 bending cycles, the resistance increased by only 2.22%, which is 3.6 times better than that of pure Ag NPs ink. The sintering of the hybrid ink promoted densification of printed traces, enhancing the temperature coefficient of resistance (TCR) to 2.71 × 10 −3 /°C at 30 °C, enabling precise monitoring across a broad temperature range of 0–240 °C. Molecular dynamics (MD) simulations revealed Ag nanomaterial growth and densification mechanisms during sintering. High-quality conformal temperature sensors were also successfully fabricated on curved structures and applied for accurate temperature monitoring during the battery discharging process of new energy vehicles. These findings underscore the significant potential of emerging AJP technology in the fabrication of high-performance conformal sensing electronic devices.
研究领域:
材料科学
·
纳米技术
·
柔性电子学
·
传感器与传感技术
·
增材制造
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Hongxia Liu,Meng Wang,Xuqiang Zhang,Jiantai Ma,Gongxuan Lu
The development of an active but cheaper catalyst is critical for efficient photocatalytic hydrogen from renewable source. In this study, we develop a high active catalyst for hydrogen evolution from formaldehyde via alloying of Pd with Ag and sensitization with a dye eosin Y (EY). The XRD, XPS, TEM and HRTEM characterizations indicate that the catalyst exhibits a core-shell structure (Ag core and Ag-Pd shell). Alloying Pd with Ag not only provides more efficient catalytic sites than single component Pd catalyst, but greatly promotes the efficient electron transfer and prolongs the lifetime of photogenerated electrons, enhances the charge separation efficiency and the photocatalytic hydrogen evolution activity significantly. The catalyst activity for hydrogen is highly dependent on the adsorption energies of HCHO and H 2 O molecules on metal surface of the alloy catalyst. Our results disclose a new route to high efficient catalyst development for solar hydrogen generation from formaldehyde.
研究领域:
材料科学
·
能源化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）