共查询到20条相似文献，搜索用时 0 毫秒
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Philip Schulz Tobias Schfer Christopher D. Zangmeister Christian Effertz Dominik Meyer Daniel Mokros Roger D. van Zee Riccardo Mazzarello Matthias Wuttig 《Advanced Materials Interfaces》2014,1(5)
The barrier to charge carrier injection across the semiconductor/electrode interface is a key parameter in the performance of organic transistors and optoelectronic devices, and the work function of the electrode material plays an important role in determining the size of this barrier. We present a new, chemical route for making metal surfaces with low work functions, by functionalizing gold surfaces with self‐assembled monolayers of n,n‐dialkyl dithiocarbamates. Ultraviolet photoemission spectroscopy measurements show that work functions of 3.2 eV ± 0.1 eV can be achieved using this surface modification. Electronic structure calculations reveal that this low work function is a result of the packing‐density, polarization along the N‐C bond, and charge rearrangement associated with chemisorption. We demonstrate that electrodes functionalized with these monolayers significantly improve the performance of organic thin‐film transistors and can potentially be employed in charge selective contacts for organic photovoltaics. 相似文献
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Jiaxin Hu Nabi Aghdassi Shubham Bhagat Yves Garmshausen Rongbin Wang Norbert Koch Stefan Hecht Steffen Duhm Ingo Salzmann 《Advanced Materials Interfaces》2020,7(3)
It is shown that fluorination of para‐sexiphenyl (6P) at the meta‐ or ortho‐positions of one terminal phenyl ring, as well as the addition of a terminal cyano‐group has an eminent impact on both growth and electronic properties of thin films. X‐ray diffraction techniques indicate that films of meta‐substituted 6P (m‐2F‐6P) develop a smooth, layered structure showing crystalline order within the layers only. Contrary, both ortho‐substituted (o‐2F‐6P) and cyano‐substituted 6P (CN‐6P) form films of 3D crystalline order. The correlation of structural information with data from ultraviolet photoelectron spectroscopy reveals that m‐2F‐6P and CN‐6P do not show preferentially oriented dipoles in the film, while o‐2F‐6P grows with collective downward orientation of the dipole moments. The subtle difference in substitution position has a dramatic impact on the thin‐film ionization energy, which increases from 5.40 (ortho) to 6.80 eV (meta) and reaches even 7.50 eV for CN‐6P. The present study shows that nonsymmetric substitution, which induces molecular dipole moments via intramolecular polar bonds, strongly impacts structure, morphology, and electronic properties of thin films. Thusly modifying common conjugated organic materials represents a valuable tool to establish smooth, crystalline layers with altered energetics at hetero‐interfaces with organic or electrode materials in electronic devices. 相似文献
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采用非均匀成核法,通过在硅灰石表面包覆硅酸铝对硅灰石进行了无机改性。扫描电镜（SEM）和X射线衍射（XRD）等测试表明,无机改性硅灰石颗粒表面粗糙,包覆着许多纳米硅酸铝粒子;通过BET比表面积分析仪测定,比表面积提高200%以上;红外光谱（FT-IR）测试表明,无机改性后硅灰石表面羟基增多;白度测试表明,无机改性硅灰石... 相似文献
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无机纳米粒子表面修饰 总被引：4，自引：0，他引：4
在讨论无机纳米粒子团聚机理的基础上综述了纳米粒子表面修饰研究进展。表面修饰包括物理和化学修饰,重点综述了表面聚合物修饰最新研究进展。介绍了以化学键在纳米粒子表面接枝聚合物,其主要方法包括在无机纳米粒子表面引入可聚合碳-碳双键合成大分子单体、此大分子单体与相应乙烯基单体共聚在表面生成聚合物;将引发剂"固定"在纳米粒子表面合成大分子引发剂,以此引发剂引发单体聚合物生成表面接枝聚合物;反应型聚合物链与粒子表面活性基团反应将聚合物链接枝到纳米粒子表面。 相似文献
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低温等离子体技术是一种新的表面改性方法，被认为是偶联剂技术的新发展。本文从等离子体表面处理方法和装置、处理后无机粉体的表面性能、使用性能等方面详细阐述了这一方法。并对该领域的研究进行了评述。 相似文献
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Xingyu Jiang;Cheng Shi;Zi Wang;Lizhen Huang;Lifeng Chi; 《Advanced materials (Deerfield Beach, Fla.)》2024,36(5):2308952
Organic transistors possess inherent advantages such as flexibility, biocompatibility, customizable chemical structures, solution-processability, and amplifying capabilities, making them highly promising for portable healthcare sensor applications. Through convenient and diverse modifications at the material and device surfaces or interfaces, organic transistors allow for a wide range of sensor applications spanning from chemical and biological to physical sensing. In this comprehensive review, the surface and interface engineering aspect associated with four types of typical healthcare sensors is focused. The device operation principles and sensing mechanisms are systematically analyzed and highlighted, and particularly surface/interface functionalization strategies that contribute to the enhancement of sensing performance are focused. An outlook and perspective on the critical issues and challenges in the field of healthcare sensing using organic transistors are provided as well. 相似文献
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Marta Giachino Brian L. Watson Geraud Dubois Reinhold H. Dauskardt 《Advanced Materials Interfaces》2015,2(17)
Hybrid organic–inorganic materials that are compositionally graded are excellent candidates for addressing the challenges related to the bonding of polymeric layers and inorganic substrates. Often, the synthesis of these hybrid materials involves the use of kinetically driven and dynamic solution systems where obtaining the desired hybrid molecular structures in the deposited film is not trivial. A coating process is used to selectively deposit a small fraction of the total species in solution with an optimized molecular weight, resulting in compositionally graded hybrid films that are organic‐rich toward the top and inorganic‐rich toward the bottom. This selective deposition technique provides a unique knob to fine tune the molecular structure of films deposited from dynamic solution systems, resulting in hybrid organic–inorganic films that exhibit an eightfold increase in adhesion of an epoxy/silicon interface. 相似文献
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低温等离子体技术是一种新的表面改性方法,被认为是偶联剂技术的新发展。从等离子体处理方法和装置,处理后无机粉体的表面性质,使用性能等方面详细阐述了这一方法,并对该领域的研究进行了评述。 相似文献
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Juan Li Xuelin Tian Alexander Pyymaki Perros Sami Franssila Ville Jokinen 《Advanced Materials Interfaces》2014,1(3)
A radial pattern with continuous topography gradient is presented, which induces a continuous inward wettability gradient and enables self‐propelling and accurate positioning of droplets to the pattern center. The effect of droplet size and wettability gradient of the pattern on the self‐mobility of droplets is investigated. The wettability gradient is found to increase towards the pattern center, enhancing the self‐motion of droplets at the inner area of the pattern. Moreover, larger droplets give rise to a larger solid‐liquid contact diameter, which helps to satisfy the self‐motion criteria that the advancing contact angle at front edge is smaller than the receding contact angle at rear edge. Consequently, a larger droplet size favors self‐motion initiated from the outer area of the pattern. The continuous topography gradient employed here allows the flexible dispensing of droplets at any place within a certain range, and avoids potential pinning defects to droplets at geometrical discontinuities. An average self‐motion velocity up to 4.0 cm/s for microliter‐sized droplets is achieved on the resultant patterned surface. 相似文献
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类球形纳米粒子的表面修饰改性 总被引：2，自引：0，他引：2
综述了类球形纳米粒子的表面改性方法，主要介绍了无机拉子表面的小分子表面活性剂的吸附以及乙烯基反应性单体的包覆聚合和接枝聚合技术，并提出上述改性方式的结合将为通用树脂的高性能化提供一种有效途径。 相似文献
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干法表面改性对无机复合阻燃剂填充EVA材料的影响 总被引：1，自引：0，他引：1
研究水镁石颗粒表面包覆水合氧化锌型无机复合阻燃剂的干法表面改性及其在乙烯-醋酸乙烯共聚物(EVA)中的应用性能,并对改性和阻燃机理进行初步分析。结果表明,经改性的阻燃剂填充的EVA材料的阻燃性能和力学性能均得到提高,特别是力学性能有较大幅度提高,材料的氧指数为38.0%,拉伸强度为12.2 MPa,断裂伸长率为360%。红外光谱分析表明,表面改性剂通过物理缠绕和化学键合的方式附着在氧化锌包覆水镁石颗粒的表面,改变了氧化锌包覆水镁石颗粒的表面性质,提高了与有机聚合物的相容性。阻燃剂的阻燃范围在300~500℃,EVA起到了非常有效的阻燃作用。 相似文献
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Janus membranes show great promise toward various applications and are undergoing a fast‐paced development in materials science. The asymmetric surface engineering on surface wettability, layer thickness, and pore structure enables Janus membranes with superiority in mass transport over conventional membranes. This review aims to provide an overview on the role of asymmetric surface engineering in membrane fabrication, structure control, and property tuning. The relationship between asymmetric surface engineering and performance optimization of Janus membranes is then elucidated based on an understanding of the underlying mass transport mechanism for target applications. Finally, current challenges in this field are highlighted, hopefully inspiring more researches to address the controllability and tunability of surface engineering for Janus membranes in future. 相似文献
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Ding Y Garland S Howland M Revzin A Pan T 《Advanced materials (Deerfield Beach, Fla.)》2011,23(46):5551-5556
A nanopatternable polydimethylsiloxane (PDMS) oligomer layer is demonstrated as an interfacial adhesive for its intrinsic transferability and universal adhesiveness. Utilizing the well-established surface modification and bonding techniques of PDMS surfaces, irreversible bonding is formed (up to 400 kPa) between a wide range of substrate pairs, representing ones within and across different materials categories, including metals, ceramics, thermoset, and thermoplastic polymers. 相似文献
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