JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Biao Zhang,Feng Ye,Shichao Liu,Haoqian Zhang,Qiang Liu,Ye Gao,Jie Ma
In this study, we developed a new route to fabricate polymer/ceramic composites. This method mainly involves tape casting and vacuum assist infiltration (called TC-VI). Composites, using Bisphenol-A cyanate ester resin (BADCy) as matrix and mixed dielectric ceramic powders (1− x ) Ni 0.5 Ti 0.5 NbO 4 + x ZnNb 2 O 6 ( x = 0–100 vol. %) as fillers, were prepared successfully by this route. Dielectric properties and thermal conductivity of the composites were tested. Furthermore, the migration of silver (Ag) electrodes in the composites was investigated. Results show that the composites exhibit excellent dielectric properties. Dielectric constant of the composites can be adjusted continuously from 13.49 to 22.46 (at 9045 MHz). Dielectric loss is lower than 3.68 × 10 −3 (at 7320 MHz). The addition of ceramic fillers can significantly enhance the thermal conductivity of BADCy resin. Moreover, no obvious Ag element migration can be detected in the composites. Due to the good performances of the composites, this method could be widely used in the fabrication of multilayer devices.
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
ORGANIC ELECTRONICS
·
2020
·
IF 3.31
Jiachen Kang,Kang Han,Xue Sun,Lianping Zhang,Rong Huang,Irfan Ismail,Zhenguo Wang,Changzeng Ding,Wusong Zha,Fangsen Li,Qun Luo,Yuanjie Li,Jian Lin,Chang-Qi Ma
Silver nanowires (Ag NWs) network is an excellent candidate as flexible transparent electrode applying in flexible perovskite solar cells, owing to their excellent electrical and optical properties . However, several problems including large surface roughness, chemical reaction between Ag and perovskite precursor, and migration of Ag limited the application in high performance perovskite solar cells . Aiming to solve these problems, the composite electrode combining the spray coated Ag nanowires and the low-temperature sol-gel zinc oxide was developed in this work. The optimized concentration and annealing temperature of sol-gel ZnO were 0.45 M and 150 °C. The introduction of zinc oxide with suitable concentration caused slight impact on the transmittance and sheet resistant of transparent composite electrode, and promoted mechanical and chemical stability in air relative to the pristine Ag NWs electrode. The use of the composite flexible electrode could decrease the surface roughness of the Ag NWs electrode, passivate the reaction of perovskite and silver electrode, and prevent the migration of Ag. As a consequence, the performance of the flexible device significantly improved from 9.51% to 13.12%. Under the AM 1.5G constant illumination, the optimization device has a remarkably improved stability than pristine device. This study demonstrates that spray Ag NWs as bottom electrode is suitable for flexible perovskite solar cells. Meanwhile, it's an effective method using sol-gel ZnO to construct composite electrode to promote the device performance and stability.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Liu Jing-Yuan,Chen Ling,Wu Li-Ming
The argyrodite Ag 9 GaSe 6 is a newly recognized high-efficiency thermoelectric material with an ultralow thermal conductivity; however, liquid-like Ag atoms are believed to cause poor stability and performance irreproducibility, which was evidenced even after the 1 st measurement run. Herein, we demonstrate the abovementioned instability and irreproducibility are caused by standard thermoelectric sample hot-pressing procedure, during which high pressure promotes the 3-fold-coordinated Ag atoms migrate to 4-fold-coordinated sites with higher-chemical potentials. Such instability can be eliminated by a simple annealing treatment, driving the metastable Ag atoms back to the original sites with lower-chemical potentials as revealed by the valence band X-ray photoelectron chemical potential spectra and single crystal X-ray diffraction data. Furthermore, the hot-pressed-annealed samples exhibit great stability and TE property repeatability. Such a stability and repeatability has never been reported before. This discovery will give liquid-like materials great application potential.
研究领域:
材料科学
·
热电学
·
固体物理学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Kun Li,Kun Liu,Dingxuan Wang,Dongyu Lvyu,Jue Cheng,Junying Zhang,Haobo Zhang,Feng Gao
The tethering of silver nanowires (AgNWs) on the optical polymeric membrane is regarded as one of the most applicable strategies constructing flexible transparent conductive electrodes (FTCEs) meeting the growing demand from flexible electronics. However, it remains a challenge to establish reliable connections between AgNWs and polymeric surface enhancing the foldable stability of FTCEs without alternating the transparency. Herein, a bifunctional interfacial engineering strategy was proposed, synergizing covalent anchoring and passivation shielding to concurrently achieve folding stability, silver migration suppression, environmental stability, and retained optical transparency. Polyethylene terephthalate (PET) surface was decorated via carbene, which was able to insert to C-H bonds instantaneously with the chain propagation hardly observed, forming the quasi-monolayer of thiol groups covalently connected with the most top layer of the PET substrate, without altering the transparency. The adhesion strength between AgNWs and PET surface was greatly enhanced by the Ag-S bonds, where the AgNWs surface frame and the sheet resistance showed no significant change after 100 seconds ultrasonic treatment in DI water and 1000 times folded, respectively. The surface decoration endowed the prepared FTCEs with high visible light transparency (85%), low sheet resistance (11.5 Ω/sq) and high infrared reflectivity (65%) simultaneously. Fluorinated alkyl chains were covalently decorated on the prepared FTCEs, forming the Ag-S bonds and protecting the electrode from the invasion of moisture, which effectively suppressed Ag migration. The presenting surface modification strategy provides a robust solution for constructing long-term stable AgNWs based FTCEs.
研究领域:
材料科学
·
纳米技术
·
电子学
·
高分子科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）