ACS Applied Nano Materials
·
2021
·
IF 5.097
Xiuli Zhang,Weiyan Liu,Hailong Li,Shuixin Xia,Chia-Kuang Tsung,Hao Liu,Wei Liu,Yi Yu
Understanding the sintering kinetics of nanoparticles is important for their applications, such as printable nanoinks and wearable devices. However, it is challenging to in situ study the sintering process at nanoscale in a liquid environment. In this work, in situ investigation of the thermal sintering of gold nanoparticles is performed using liquid cell transmission electron microscopy. We have observed the unique sintering process of two nanoparticles in the liquid phase. By heating the gold nanoparticle solution in a liquid cell, a neck formed between the two nanoparticles at the initial sintering stage, followed by a rapid increase of neck size accompanied by a more rounded surface, and finally, the as-formed gold dimer shrank to a short nanorod. The sintering observations are dominated by two different surface diffusion paths and grain boundary diffusion. Furthermore, the high surface energy of small nanoparticles results in a higher shrinkage ratio in sintering. This insight of the kinetics of nanoparticle sintering provided by in situ characterization offers guidance for the future applications such as ink-jet printing.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
·
2014
·Vol. 2014
·期 1
·193201
·
IF 1.611
Yuan-Jun Song,Jing Chen,Jing-Yuan Wu,Tong Zhang
Silver nanowire has potential applications on transparent conducting film and electrode of electrochemical capacitor due to its excellent conductivity. Transparent conducting film (G-film) was prepared by coating silver nanowires on glass substrate using Meyer rod method, which exhibited better performance than carbon nanotube and graphene. The conductivity of G-film can be improved by increasing sintering temperature. Electrode of electrochemical capacitor (I-film) was fabricated through the same method with G-film on indium tin oxide (ITO). CV curves of I-film under different scanning rates had obvious redox peaks, which indicated that I-film exhibited excellent electrochemical pseudocapacitance performance and good reversibility during charge/discharge process. In addition, the specific capacitance of I-film was measured by galvanostatic charge/discharge experiments, indicating that I-film exhibits high special capacitance and excellent electrochemical stability.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Advanced Healthcare Materials
·
2022
·Vol. 12
·期 10
·2202531
·
IF 11.092
Yan Niu,Gongwei Tian,Cuiyuan Liang,Tianchi Wang,Xu Ma,Guifen Gong,Dianpeng Qi
Liquid metal (especially eutectic gallium indium, EGaIn) nanoparticle inks overcome the poor wettability of high surface tension EGaIn to elastomer substrates and show great potential in soft electronics. Normally, a sintering strategy is required to break the oxide shells of the EGaIn nanoparticles (EGaIn NPs) to achieve conductive paths. Herein, for the first time, thermal-sinterable EGaIn NP inks are prepared by introducing thermal expansion microspheres (TEMs) into EGaIn NP solution. Through the mechanical pressure induced by the expansion of the heated TEMs, the printed EGaIn NPs can be sintered into electrically conductive paths to achieve highly stretchable bioelectrode arrays, which exhibit giant electromechanical performance (up to 680% strain), good cyclic stability (over 2 × 10 4 cycles), and stable conductivity after high-speed rotation (6000 rpm). Simultaneously, the recording sites are hermetically sealed by ionic elastomer layers, ensuring the complete leakage-free property of EGaIn and reducing the electrochemical impedance of the electrodes (891.16 Ω at 1 kHz). The bioelectrode is successfully applied to monitor dynamic electromyographic signals. The sintering strategy overcomes the disadvantages of the traditional sintering strategies, such as leakage of EGaIn, reformation of large EGaIn droplets, and low throughput, which promotes the application of EGaIn in soft electronics.
研究领域:
材料科学
·
生物医学工程
·
软体电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Zhiwei Liu,Yan Zhao,Shuang Li,Tianpei Sun,Hansong Liu,Kai Wang,Xiangbao Chen
In this paper, a two-dimensional MXene loaded with CeO2 nanoparticles was successfully synthesized through a simple solvothermal sintering method. The nanocomposite obtained by mixing the CeO2/Ti3C2Tx MXene with paraffin at 30 wt % has a high reflection loss of −47.27 dB at a thickness of 1.9 mm and an effective absorption bandwidth of up to 4.22 GHz which is higher than that of a similar absorbing system. By adjusting the composition ratio and the thickness of the system, almost all S, C, X, and Ku bands can be covered. Its excellent performance benefits from the abundant oxygen vacancies brought by CeO2 nanoparticles in which Ce3+ and Ce4+ ions coexist and the rich microinterfaces brought by the CeO2–C–Ti3C2Tx sandwich structure. In addition, CeO2/Ti3C2Tx MXene nanocomposites also have high thermal stability. This research extends the thought on the design of high-performance microwave-absorbing materials.
研究领域:
材料科学
·
电磁材料
·
纳米技术
✓ 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）