ACS Applied Electronic Materials
·
2019
·
IF 0
Nan Zhang,Chun Huang,Shangshang Wan,Ling Kang,Menghan Hu,Yonghua Zhang,Xing Wu,Jian Zhang
An easy-to-fabricate, high-performance, and ultrabendable heater is always essential for the development of flexible devices such as gas sensors. Currently, most of the flexible heaters involve vacuum facilities or special inkjet printers/inks, which leads to complex processes and high fabrication cost. In this work, an innovative polymeric metalization technique was developed on polyimide substrate: in addition to the tunable electrical properties, Ag thin films obtained through the low-temperature solution-based process, the so-called surface modification and ion exchange (SMIE) process, could provide enhanced interfacial adhesion and mechanical stability. With a carbon ink as a masking layer, generated by a common home-/office-use inkjet printer, more than 400 patterned flexible heaters can be batch-fabricated on an A4 size polyimide conveniently. The results indicate that the heaters exhibit good electrical properties as well as superior bending stabilities. For the heaters with dimension of 1 cm × 1 cm, under an applied voltage of 20 Vdc, the maximum temperature achieved is 300 °C. Both the response time and recovery time are less than 15 s. The heaters can bear more than 1200 times bending cycling with a relative resistance change ratio of 0.11%. The developed technology is compatible with current batch fabrication processes such as roll-to-roll and can be employed to develop flexible heaters with high mechanical stability in the future.
研究领域:
材料科学
·
柔性电子
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产品关联
DOI
CRYSTAL GROWTH & DESIGN
·
2017
·
IF 4.055
Kaisheng Yao,Zhiyong Li,Xinying Li,Weiwei Lu,Airong Xu,Hucheng Zhang,Jianji Wang
The design of green and ingenious strategies for the fabrication of anisotropic nanoparticles and their assembly is particularly important in the advancement of nanoscience and nanotechnology but still remains an enormous challenge. In this work, the Ag films, with variously shaped particles as building blocks, were successfully prepared at the interface of different ionic liquids and water (ILs–H2O) under ambient conditions only by using ILs with different cationic structures. The as-prepared Ag films with different morphologies were characterized and analyzed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray powder diffraction. The possible growth mechanisms were also suggested for the formation of differently morphological Ag films at the ILs–H2O interface. The as-obtained Ag films could be directly applied to perform surface-enhanced Raman scattering (SERS) studies. It was found that the nanobelt-contructed Ag films prepared at the interface of methyltrioctylammonium bis(trifluoromethylsulfonyl)imide ([N8881][Tf2N]) and water exhibited striking SERS sensitivities and good reproducibility.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2024
·
IF 1.3
Liu Cheng Y.,Jie Chao Y.,Cao Dao,Liu Yu,Li Feng Cui,Gao Shu N.
Silver film is commonly used to examine the structure and composition of molecules due to its surface-enhanced Raman scattering (SERS) effect. A simple method for preparing SERS silver films is proposed in this paper by electrodeposition in an amide-based liquid mixture (urea-acetamide-LiBr). The electrochemical behavior of silver in urea-acetamide-LiBr mixture was studied by cyclic voltammetry (CV) and chronoamperometry. It was found that the nucleation mechanism of silver shifts to instantaneous nucleation under diffusion control with increasing overpotential and temperature. The energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) investigations confirmed that the obtained deposits are pure silver. Scanning electron microscopy (SEM) analysis showed that the morphology of the silver deposits depends on the deposition potential and temperature. Rhodamine 6G was used as probe molecules for SERS experiments, showing that these new active substrates have high sensitivity to SERS response with high enhancement factors, of approximately 107, and enable Raman scattering even for diluted solutions.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
IEEE Sensors Letters
·
2024
·Vol. 8
·期 8
·1-4
·
IF 2.2
Shuimin Li,Zhongkai Zhang,Jiaming Lei,Zhaojun Liu,Jiangjiang Liu,Meng Wang,Qing Tan,Rui Qi,Bian Tian
Thin-film thermocouples (TFTC) have been extensively studied for their wide range of applications in various environments. However, TFTC faces challenges in electromagnetic environments as they can generate AC interference voltage. In this study, we introduce a thermocouple temperature sensor shielded by silver (Ag) thin film on both sides of aluminum oxide (Al
2
O
3
) substrate. The high conductivity of Ag film (11.48 mΩ/□) helps reduce interference caused by alternating current, resulting in a superior electromagnetic shielding effectiveness of 43.68 dB. The temperature sensitivity coefficient of this sensor is 20.87
$\mu$
V/°C at a hot end temperature of 318.44 °C. These shielded TFTC temperature sensors show great potential for applications in aerospace, iron and steel metallurgy, and other industries.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Danping Wang,Erwei Cheng,Zhaoming Qu,Yingying Wang,Qingguo Wang
Ag thin films having attractive optical transmittance and effective shielding capability are usually used as a preferred choice for the transparent electromagnetic shielding windows. Whereas, the Ag films are grown primarily via an island growth (Volmer-Weber) mechanism, which greatly restricts its application. In this study, by introducing Al atoms and suitable annealing treatment, the continuous and smooth Ag thin films are successfully fabricated by magnetron co-sputtering method. The effect of annealing temperature on the microstructure, optical and electromagnetic shielding properties of the films are conducted the comprehensive and profound study. Our results indicate that the 5 mol% Al-Ag thin film annealed at 200 °C could transform into planar growth structure, and display excellent the highest optical transmittance 89.15 % at 550 nm. Meanwhile, the shielding effectiveness (SE) reaches a peak value of 28.1 dB. 500 °C is estimated as the threshold annealing temperature of Al-Ag thin film with comprehensive performances gradually declining. Moreover, the Al dopants significantly improve the thermal stability of Ag thin films than that of the pure Ag films. These findings are of important guidance for the preparation of high-quality Al-Ag thin films to meet the practical applications.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 6
·49806
·
IF 2.52
Dexin Chen,Zhixin Kang,Wei Li
Here, thin Ag films with excellent properties were successfully prepared on flexible substrates through surface grafting and assembling followed by simple spray-assisted deposition process. The constructed molecule brushes provide the interfacial adhesion for Ag layers onto polymer substrates. The mechanical and electrical properties of the conductive Ag coated PET could be tuned by changing the spraying passes. As the electromagnetic interference shielding material, the composite PET possesses a highest shielding efficiency of 45 dB. In addition, the Ag coated PET with the thickness of 0.1 mm would maintain the 72% electrical conductivity even been folded even at a minimum diameter of 0.2 mm. It was demonstrated that uniform and fine cracks would generate when the Ag coated PET was stretching, but Ag films still retain continuous networks to maintain the high electronic conductivity even stretching to 100%. Simple finite element modeling results prove that the stress by stretching would concentrate in corner of the crack and the deformation is mainly at stress side. The Ag layers were also produced on TPU substrates to detect the stretching, showing its potential applications for strain sensors and health monitoring systems.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Lian Hu,Tianning Xu,Huaxin Zhu,Chaoqun Ma,Guoqing Chen
Enhanced luminescence of an emitter on a Ag film is usually ascribed to the resonant surface plasmons. In these studies, the solid cadmium sulfide (CdS) and cadmium selenide (CdSe) quantum dot/silver (QD/Ag) hybrids were prepared, and the luminescence characteristics of these QD/Ag hybrids were measured. It is found that the enhancement of the trap state emission (TSE) is related to the QD size. The TSE features of the annealed QD/Ag hybrids are insensitive to the morphology of the Ag film. We used the wet and dry methods to separate the QD and Ag components and found that the photoluminescence (PL) of the QD component was permanently changed from the initial state. The PL modification is ascribed to the Ag+ doping effect rather than the surface plasmons. This doping method uses pure Ag as the Ag+ ion source. In this case, though the CdS and CdSe QD/Ag hybrids are the solid state, the cation exchange between Ag+ and Cd2+ ions can still occur on the QD surface. Even a small amount of Ag can efficiently influence the luminescence of the QDs embedded in the poly(methyl methacrylate) matrix. A hypothetical model was proposed to explain the PL modification of the QD/Ag hybrid with and without annealing. Using this dry method for doping, the transparent luminescence label can be prepared easily, and the doped QDs can be further doped with Ag+ dopants.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Hongyuan He,Jiebin Du,Zhangzhao Weng,Changxiang Fan,Luo Xicai,Zhixin Kang,Dexin Chen
Superhydrophobic surfaces were fabricated by a simple one-step electrodeposition technique to deposit three distinct micro/nano hierarchical structures of Ce, Mg, or Cu-based compounds on Ag films on a flexible polymer substrate. Scanning electron microscopy was used to examine the surface morphologies of obtained structures with different deposition. Compared with the bare Ag films, one-step electrodeposition process resulted in superhydrophobicity, including a water contact angle of 159.7° for Ce-modified surfaces, 157.0° for Mg-modified surfaces, and 153.8° for Cu-modified surfaces. Besides, these surfaces showed high thermal stability below 120 ℃, and good flexibility but low electrical conductivity . EDS and XPS results suggest the production of low surface energy materials that formed the superhydrophobic features on the Ag films. Besides, because of the formation of CeO 2 , Ce-SHS had better superhydrophobicity than Mg-SHS and Cu-SHS. In addition, the potentiodynamic polarization experiments showed that the electrodeposited superhydrophobic surfaces had lower I corr , higher E corr and impedance values in NaCl solution, Na 2 SO 4 solution and Simulated body fluid, and artificial sweat solution compared with the bare silver film, indicating that the electrodeposited protective film has good anti-corrosion properties. These results suggest that the one-step electrodeposition method is a promising strategy to fabricate conducting films with superhydrophobic surfaces for surface protection under various corrosive environments.
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
Materials Research Express
·
2022
·Vol. 9
·期 1
·016303
·
IF 2.025
PeiYuan Fan,WenHua Zhang,Xianglei Yu,GuoYou Gan
Attaining low-temperature sintering and high electrical conductivity is vital in the field of flexible electronics. Inks with silver oxalate as the precursor have recently received significant attention in this field; however, the high sintering temperature and long sintering time limit commercial applicability. High sintering temperature can shorten the sintering time but lead to porous and uneven film morphology; thus, reducing the conductivity. On the other hand, low sintering temperature prolongs the sintering time; thus, reducing the production efficiency. To solve the abovementioned problems, a silver composite conductive ink modified by polyvinylpyrrolidone (PVP) was prepared in this study. The ink used silver oxalate as the precursor, methanol and acetone as the solvent, and 1, 2-diaminopropane as the complexing agent, and could reduce the sintering temperature and time to 160 °C and 20 min, respectively. After sintering, the silver film showed good electrical conductivity, and low resistivity (4.56 μΩ·cm). Furthermore, the impact of sintering temperature on the surface morphology and electrical conductivity were also studied, and the results showed that PVP had a positive influence on the nucleation of silver and the microstructure of the sintered silver film.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
OPTICS EXPRESS
·
2024
·Vol. 32
·期 19
·33330-33343
·
IF 3.2
Zhibing Zhang,Zhiyong Yin,Shuguang Li,Linchuan Hu
To achieve more accurate analysis and detection of changes in liquid parameters, we propose a dual-parameter surface plasmon resonance (SPR) sensor that can measure refractive index (RI) and pH simultaneously. In this paper, we compare and analyze the transmission spectrum when the SPR effect is excited by the cladding mode of a photonic crystal fiber (PCF) and the core mode of the no-core fiber. The results show that the SPR effect excited using the cladding mode is stronger and the sensor has better loss peaks, which is more conducive to realizing the detection of the external environment. Therefore, the sensor uses PCF as the substrate and utilizes a cascade composite film structure, and the area where a silver film is deposited on the surface of the PCF is selected as the RI sensing area. Another part of the PCF, after the silver film is deposited, uses a high-sensitivity polyacrylic acid/chitosan self-assembled nanofilm as the pH-sensitive film. Experimental results show that the maximum sensitivity is 4122.44 nm/RIU and -57.82 nm/pH when the RI range is between 1.333 and 1.385 and the pH range is between 3.11 and 8.63, respectively. In addition, we experimentally verified that the sensor had good stability and repeatability. The design of the sensor provides new possibilities for real-time monitoring and precise control, helping to advance scientific research and the development of industry.
研究领域:
光学传感
·
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yongshuai Jing,Cheng Tao,Hao Zhang,Ziying Wang,Hanju Fan,Beibei Hu,Lanfang Wu
Facing the clinical challenge of uncontrolled bleeding and infection after trauma, it is urgent to obtain a new type of dressing with antibacterial and wound healing promoting activities and good biological safety. Polysaccharide was extracted from Laminaria japonica Aresch by water extraction and alcohol precipitation, and LA-1 was obtained after separation and purification by DEAE-52 cellulose column. LA-1 had →2,6)-β-Manp-(1→) as the main chain and →4)-OAC-β-Galp-(1→, →3)-α-Fucp(1→, →4)-β-ManpA-(1→ and →4). Then, A kind of (PSx%AN) membrane with hemostatic and antibacterial functions was prepared by solution casting with LA-1 as green reducing agent and stabilizer. The (PSx%AN) film was formed by the cross-linking reaction of LA-1, AgNO 3 , polyvinyl alcohol and starch (3:1), in which the starch interacted with the polyhydroxy structure of polyvinyl alcohol to form hydrogen bonds, which endowed the film with good mechanical strength and biocompatibility. In order to comprehensively evaluate the performance of (PSx%AN) membrane, the oxidation resistance, antibacterial activity and cytotoxicity were tested, and animal experiments were also carried out. The results of the anti-oxidation and anti-bacterial experiments showed that the (PSx%AN) film not only exhibited good anti-oxidation performance, but also demonstrated a strong inhibitory effect on S. aureus and E. coli , with the maximum inhibition zone diameters of 16.8 ± 0.3 mm and 11.0 ± 0.2 mm respectively. The full-thickness skin defect experiment demonstrated that the (PS1%AN) membrane exhibited superior results compared to other groups on the 11th day. Specifically, it effectively increased the hydroxyproline concentration to 4.69 ± 0.19 μg/mL and the total protein content to 551.09 ± 7.19 μg/mL. Additionally, it reduced inflammatory responses, shortened wound healing time in mice, and promoted tissue repair. These findings provide a novel perspective for the (PSx%AN) membrane as a potential hemostatic and anti-infective wound dressing.
研究领域:
生物材料学
·
医学工程
·
药理学
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产品关联
DOI
PubMed
高影响因子
Materials Advances
·
2021
·Vol. 3
·期 1
·647-657
·
IF 0
Jingyuan Zhang,Xiaodong Li,Mu Zhang,Qi Zhu,Xudong Sun
Herein, we present a clean, green and economical method to prepare flexible and ultrathin silver films for electromagnetic interference (EMI) shielding by thermal decomposition of metal–organic decomposition (MOD) inks. The non-particulate ink synthesized by complexing silver oxalate with 1,2-diaminopropane in ethanol solvent can be easily decomposed to pure silver at a quite low temperature in air. The efficient electrical transport network constructed by the interconnected nanoparticles of the silver film results in outstanding electrical properties and shielding performance, with an absorption-dominated mechanism. By curing the ink at 130 °C for 30 min, a more effective network structure for electron transport can be obtained. By the spin coating deposition method, the silver film with only a 200 nm thickness has an ultrahigh conductivity of 8.46 × 106 S m−1 and excellent shielding effectiveness of 51.1 dB at 10.3 GHz in the X band, which is the highest shielding effectiveness of the film with such thin thickness so far. The factors affecting the EMI shielding performance of silver films were elucidated, including the heat treatment process, ink concentration and spin coating times, and the relationship between the microstructure and the properties of the film was established. This work indicates that silver metal–organic decomposition inks will be a favorable choice for the industrial production of EMI shielding applications.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
危险品化学品经营许可证（带存储）