共查询到20条相似文献，搜索用时 15 毫秒
1.
Bhanu Nandan E. Bhoje Gowd Nadja C. Bigall Alexander Eychmüller Petr Formanek Paul Simon Manfred Stamm 《Advanced functional materials》2009,19(17):2805-2811
Here, a novel and simple route to fabricate highly dense arrays of palladium nanodots and nanowires with sub‐30 nm periodicity using nanoporous templates fabricated from supramolecular assemblies of a block copolymer, polystyrene‐block‐poly(4‐vinylpyridine) (PS‐b‐P4VP) and a low molecular weight additive, 2‐(4′‐hydroxybenzeneazo) benzoic acid (HABA) is demonstrated. The palladium nanoparticles, which are directly deposited in the nanoporous templates from an aqueous solution, selectively migrate in the pores mainly due to their preferential attraction to the P4VP block covering the pore wall. The polymer template is then removed by oxygen plasma etching or pyrolysis in air resulting in palladium nanostructures whose large scale morphology mirrors that of the original template. The method adopted in this work is general and versatile so that it could easily be extended for patterning a variety of metallic materials into dot and wire arrays. 相似文献
2.
A. M. Jakob M. Hennes M. Müller D. Spemann S. G. Mayr 《Advanced functional materials》2013,23(37):4694-4702
Micromagnetic structure evolution in Ni‐Mn‐Ga ferromagnetic shape memory thin films is investigated by means of temperature dependent magnetic force microscopy (TD‐MFM). The center of interest is the magnetic properties of epitaxial Ni‐Mn‐Ga thin films on MgO substrates across thermally induced phase transitions. Experimental results are discussed within the framework of competing magnetic interactions arising in stressed thin ferromagnetic films. Measurements on 14M martensite specimens are supplemented by three‐dimensional micromagnetic simulations. Corresponding calculated MFM micrographs are compared to experimental data. The influence of twin variant dimension and orientation on micromagnetic domain formation and wall structure is depicted from a theoretical point of view. A micromagnetic model system of partial flux closure is proposed and calculated analytically to estimate a stress induced magneto crystalline anisotropy constant in austenite Ni‐Mn‐Ga. 相似文献
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本文介绍了金刚石薄膜和类金刚石薄膜的制备与薄膜性能分析方法,也介绍了它们的应用前景。本文给出了华北光电所研究类金刚石薄膜的结果。 相似文献
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Capucine Sassoye Christel Laberty Hung Le Khanh Sophie Cassaignon Cédric Boissière Markus Antonietti Clément Sanchez 《Advanced functional materials》2009,19(12):1922-1929
RuO2‐based mesoporous thin films of optical quality are synthesized from ruthenium‐peroxo‐based sols using micelle templates made of amphiphilic polystyrene‐polyethylene oxide block copolymers. The mesoporous structure and physical properties of the RuO2 films (mesoporous volume: 30%; pore diameter: ～30 nm) can be controlled by the careful tuning of both the precursor solution and thermal treatment (150–350 °C). The optimal temperature that allows control of both mesoporosity and nanocristallinity is strongly dependent on the substrate (silicon or fluorine‐doped tin oxide). The structure of the resulting mesoporous films are investigated using X‐ray diffraction, X‐ray photoelectron spectroscopy, and atomic force microscopy. Mesoporous layers are additionally characterized by transmission and scanning electron microscopy and ellipsometry while their electrochemical properties are analyzed via cyclic voltammetry. Thick mesoporous films of ruthenium oxide hydrates, RuO2 · xH2O, obtained using a thermal treatment at 280 °C, exhibit capacitances as high as 1000 ± 100 F g?1 at a scan rate of 10 mV s?1, indicating their potential application as electrode materials. 相似文献
5.
César Moreno Patricia Abellán Awatef Hassini Antoine Ruyter Angel Pérez del Pino Felip Sandiumenge Marie‐Jose Casanove José Santiso Teresa Puig Xavier Obradors 《Advanced functional materials》2009,19(13):2139-2146
A new mechanism is proposed for the generation of self‐assembled nanodots at the surface of a film based on spontaneous outcropping of the secondary phase of a nanocomposite epitaxial film. Epitaxial self‐assembled Sr–La oxide insulating nanodots are formed through this mechanism at the surface of an epitaxial metallic ferromagnetic La0.7Sr0.3MnO3 (LSMO) film grown on SrTiO3 from chemical solutions. TEM analysis reveals that, underneath the La–Sr oxide (LSO) nanodots, the film switches from the compressive out‐of‐plane stress component to a tensile one. It is shown that the size and concentration of the nanodots can be tuned by means of growth kinetics and through modification of the La excess in the precursor chemical solution. The driving force for the nanodot formation can be attributed to a cooperative effect involving the minimization of the elastic strain energy and a thermodynamic instability of the LSMO phase against the formation of a Ruddelsden–Popper phase Sr3Mn4O7 embedded in the film, and LSO surface nanodots. The mechanism can be described as a generalization of the classical Stranski–Krastanov growth mode involving phase separation. LSO islands induce an isotropic strain to the LSMO film underneath the island which decreases the magnetoelastic contribution to the magnetic anisotropy. 相似文献
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Luc Piot Carlos‐Andres Palma Anna Llanes‐Pallas Maurizio Prato Zsolt Szekrényes Katalin Kamarás Davide Bonifazi Paolo Samorì 《Advanced functional materials》2009,19(8):1207-1214
Here, the formation of discrete supramolecular mono‐ and bi‐component architectures from novel and multivalent molecular modules bearing complementary recognition moieties that are prone to undergo multiple H‐bonds, such as 2,6‐di(acetylamino)pyridine and uracil residues, is described. These nanostructured H‐bonded arrays, including dimeric and pentameric species, are thoroughly characterized in solution by NMR, in the solid state by FT‐IR, and at the solid–liquid interface by means of scanning tunneling microscopy. The employed strategy is extremely versatile as it relies on the tuning of the valency, size, and geometry of the molecular modules; thus, it may be of interest for the bottom‐up fabrication of nanostructured functional materials with sub‐nanometer precision. 相似文献
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本文对反应离子镀和反应蒸发（电子束蒸发）工艺制备的光学薄膜的牢固度和表面粗糙度进行了检测，并将结果进行对比。 相似文献
10.
《Advanced Electronic Materials》2017,3(9)
The use of novel organosilica materials embedding π‐conjugated moieties as semiconductor into field‐effect transistors is demonstrated. The chosen π‐conjugated core is a [1]benzothieno[3,2‐b][1]benzothiophene that is modified with hydrolyzable and crosslinkable triethoxysilyl moieties. After polycondensation, this compound forms a hybrid material composed of charge transport pathways as well as insulating sublayers made of silicon oxide (SiOx ). The hybrid material behaves as a semiconductor and is subsequently integrated as active layer into field‐effect transistors. These precursors show J‐type aggregation that evolves toward H‐type aggregates during the sol–gel process, which improve charge transport. Taking advantage of the sol–gel chemistry involved here, hybrid field‐effect transistors that are fully crosslinked with covalent bonds are built. Molecules are crosslinked to each other, covalently bonded to the silicon oxide dielectric, and also covalently bonded to the gold electrodes, thanks to the use of an appropriate additional interfacial monolayer. This is the first report of fully covalent transistors. Those devices with modest mobilities show impressive resilience against polar, aliphatic, and aromatics solvents even under sonication. This study opens the route toward a new class of hybrid materials to create highly robust electronic applications. 相似文献
11.
Olha Hoy Bogdan Zdyrko Robert Lupitskyy Roman Sheparovych Dennis Aulich Jiafang Wang Eva Bittrich Klaus‐Jochen Eichhorn Petra Uhlmann Karsten Hinrichs Marcus Müller Manfred Stamm Sergiy Minko Igor Luzinov 《Advanced functional materials》2010,20(14):2240-2247
The ability to vary, adjust, and control hydrophobic interactions is crucial in manipulating interactions between biological objects and the surface of synthetic materials in aqueous environment. To this end a grafted polymer layer (multi‐component mixed polymer brush) is synthesized that is capable of reversibly exposing nanometer‐sized hydrophobic fragments at its hydrophilic surface and of tuning, turning on, and turning off the hydrophobic interactions. The reversible switching occurs in response to changes in the environment and alters the strength and range of attractive interactions between the layer and hydrophobic or amphiphilic probes in water. The grafted layer retains its overall hydrophilicity, while local hydrophobic forces enable the grafted layer to sense and attract the hydrophobic domains of protein molecules dissolved in the aqueous environment. The hydrophobic interactions between the material and a hydrophobic probe are investigated using atomic force microscopy measurements and a long‐range attractive and contact‐adhesive interaction between the material and the probe is observed, which is controlled by environmental conditions. Switching of the layer exterior is also confirmed via protein adsorption measurements. 相似文献
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用扫描电镜和X射线能谱分析仪研究高温氧化及薄膜工艺过程中主要溶液对氮化铝陶瓷（AIN）基板的影响。结果表明：高温氧化使表面氧含量增加，在1000℃氧化2h，表面已形成致密的氧化层。碱性溶液清洗和去离子水煮会使表面产生多孔的疏松化合物。采用高温氧化、酸性清洗、溅射前加强离子轰击等措施，磁控溅射TiCu，其薄膜膜层附着力不低于15MPa。 相似文献
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Ryan Keech Linghan Ye James L. Bosse Giovanni Esteves Jonathon Guerrier Jacob L. Jones Marcelo A. Kuroda Bryan D. Huey Susan Trolier‐McKinstry 《Advanced functional materials》2017,27(9)
Lateral subdivision of blanket piezoelectric thin films increases the functional properties through both increased domain wall mobility and declamping of the intrinsic response. This work presents the local effects of substrate declamping on the piezoelectric coefficient d 33,f of 300 nm thick, rhombohedral, {001}‐oriented lead magnesium niobate–lead titanate thin films at the 70/30 composition (70PMN–30PT). Films grown by chemical solution deposition on platinized Si substrates are patterned into strip structures ranging from 0.75 to 9 µm in width. The longitudinal piezoelectric coefficient, d 33,f, is interrogated as a function of position across the patterned structures by three approaches: finite element modeling, piezoresponse force microscopy, and nanoprobe synchrotron X‐ray diffraction. It is found that d 33,f increases from the clamped value of 40–50 to ≈160 pm V?1 at the free sidewall under 200 kV cm?1 excitation. The sidewalls partially declamp the piezoelectric response 500–600 nm into the patterned structure, raising the piezoelectric response at the center of features with lateral dimensions less than 1 µm (3:1 width to thickness aspect ratio). The normalized data from all three methods are in excellent agreement, with quantitative differences providing insight to the field dependence of the piezoelectric coefficient and its declamping behavior. 相似文献
14.
Thin Films: Sub‐Micrometer Structure Formation during Spin Coating Revealed by Time‐Resolved In Situ Laser and X‐Ray Scattering (Adv. Funct. Mater. 46/2017) 
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下载免费PDF全文 Jacobus J. van Franeker Daniel Hermida‐Merino Cedric Gommes Kirill Arapov Jasper J. Michels René A. J. Janssen Giuseppe Portale 《Advanced functional materials》2017,27(46)
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An interesting class of materials is mesoporous organosilica materials containing a bridging, organic group along the pore‐surface. Such materials are prepared from silsesquioxane precursors of the type (R′O)3Si‐R‐Si(OR′)3 where R is the bridging organic group of interest, in combination with a lyotropic phase as a template for the generation of the pores. A new silsesquioxane precursor, 1,3‐bis‐(trialkoxysilyl)‐5‐bromobenzene, and the related mesoporous organosilica material containing bromobenzene groups located at the pore walls are presented in the current publication. The latter precursor allows access to the derivatization reactions known for halogenated aromatic compounds. Materials containing phenyl derivatives can be obtained either by chemical modifications starting from the mentioned precursor on the molecular scale, or the modifications can be performed directly at the surfaces of the porous material. Materials with surfaces containing benzoic acid, styrene, and phenylphosphonic acid are described. 相似文献
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Waldemar A. Marmisollé Joseba Irigoyen Danijela Gregurec Sergio Moya Omar Azzaroni 《Advanced functional materials》2015,25(26):4144-4152
The ability to engineer surfaces at the supramolecular level by controlled integration of specific chemical units through substrate‐independent methodologies represents one of the new paradigms of contemporary materials science. Here, a method is reported to form multifunctional supramolecular coatings through simple dip‐coating of substrates in an aqueous solution of polyamine in the presence of phosphate anions. The chemical richness and versatility of polyamines are exploited as phosphate receptors to form thin functional films on a broad variety of substrates, ranging from metal to carbonaceous surfaces. It is shown that the simple derivatization of pendant amino groups of polyallylamine precursors with different chemical groups can endow films with predefined responsiveness or multiple functions—this translates into one‐pot and one‐step preparation of substrate‐adherent films displaying built‐in functions. It is believed that the flexibility, speed, and versatility with which this method provides such robust functional films make it very attractive for preparing samples of fundamental and technological interest. 相似文献
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The fabrication of multilayer assemblies from polymeric compounds is an important tool for precise control of film architecture on the nanoscale. In this report, a general, novel approach for the preparation of well‐defined polymeric multilayers is described. To achieve this, sulfonyl‐azide group containing polymers are first generated and deposited as thin films onto solid (organic) substrates. Upon thermal activation, the system crosslinks and binds to the substrate via C–H bond insertion. Through step‐and‐repeat procedures, multilayer assemblies are then generated where all the individual layers are linked to each other. As the assembly process does not require any specific molecular interactions, the described process represents a general strategy to generate tailor‐made multilayer surface coatings with wide range of film thickness and composition. 相似文献
18.
David S. Bergsman Jon G. Baker Richard G. Closser Callisto MacIsaac Mie Lillethorup Alaina L. Strickler Laurent Azarnouche Ludovic Godet Stacey F. Bent 《Advanced functional materials》2019,29(43)
Hybrid molecular layer deposition (MLD) has significant potential for the creation of ultrathin electrochemically active materials, due to its ability to combine organic and inorganic species to modulate film properties. However, only a limited number of hybrid MLD processes are demonstrated with electrochemically relevant elements, such as manganese. Here, a “manganicone” manganese hybrid MLD chemistry is developed using the precursors bis(ethylcyclopentadienyl)manganese and ethylene glycol. The resulting manganese alkoxide coordination networks are shown to have many interesting properties, including the ability to seamlessly fill high aspect ratio vias and the chemical conversion into manganese carboxylate in air over several hours at room temperature. Linear, self‐saturating growth is reported. Importantly, hybrid manganicone films annealed to 480 °C in air demonstrate a greater stability to restructuring during electrochemical testing than their inorganic counterparts grown by atomic layer deposition, without reducing the activity of the reactive sites on the manganese surface. Thus, hybrid manganese films grown by MLD have significant promise for use as catalysts for the oxygen evolution reaction and as electrodes in thin film batteries. 相似文献
19.
Sensors: Thin Film Growth of nbo MOFs and their Integration with Electroacoustic Devices (Adv. Funct. Mater. 11/2016) 下载免费PDF全文
下载免费PDF全文 Vitalie Stavila Christian Schneider Curtis Mowry Todd R. Zeitler Jeffery A. Greathouse Alex L. Robinson Julie M. Denning Joanne Volponi Kirsty Leong William Quan Min Tu Roland A. Fischer Mark D. Allendorf 《Advanced functional materials》2016,26(11):1669-1669
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Polyaniline/indium oxide(PANI/In2O3)nanocomposite thin films have been prepared in water-dispersed medium with the presence of different surfactants by an in-situ self-assembly technique.A cationic surfactant TTAB(tetradecyltrimethylammonium bromide)and a non-ionic surfactant tween20(poly(ethylene oxide)(20)sorbitan monolaurate)are used as additives.The nauocomposites and thin films are characterized by Fourier transform infrared(FTIR),transmission electron microscopy(TEM),and scanning electron microscopy(SEM),respectively.The optical properties reveal the Interaction between PANI/In2O3nanocomposites and surfactants,and PANI/In2O3 thin films prepared in the presence of surfaetants exhibits the finer nanofiber than the surfactants free PANI/In2O3thin film.The ammonia(NH3)gas-sensing characteristic of PANI/In2O3 thin films and the effect of different surfactants on the gas-sensing property are studied.The results indicated that the film processed in the presence of TTAB has the highest gas sensitivity among all the prepared films. 相似文献