http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Structural engineering of nanoporous anodic aluminium oxide by pulse anodization of aluminium.
Lee, Woo,Schwirn, Kathrin,Steinhart, Martin,Pippel, Eckhard,Scholz, Roland,Gö,sele, Ulrich Nature Pub. Group 2008 Nature nanotechnology Vol.3 No.4
<P>Nanoporous anodic aluminium oxide has traditionally been made in one of two ways: mild anodization or hard anodization. The first method produces self-ordered pore structures, but it is slow and only works for a narrow range of processing conditions; the second method, which is widely used in the aluminium industry, is faster, but it produces films with disordered pore structures. Here we report a novel approach termed 'pulse anodization' that combines the advantages of the mild and hard anodization processes. By designing the pulse sequences it is possible to control both the composition and pore structure of the anodic aluminium oxide films while maintaining high throughput. We use pulse anodization to delaminate a single as-prepared anodic film into a stack of well-defined nanoporous alumina membrane sheets, and also to fabricate novel three-dimensional nanostructures.</P>
Li, Xue,Fu, Jun,Steinhart, Martin,Kim, Dong-Ha,Knoll, Wolfgang Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.6
A simple approach to prepare arrays of Au/TiO2 composite nanoparticles by using Au-loaded block copolymers as templates combined with a sol-gel process is described. The organic-inorganic hybrid films with closely packed inorganic nanodomains in organic matrix are produced by spin coating the mixtures of polystyrene-block-poly(ethylene oxide) (PS-b-PEO)/HAuCl4 solution and sol-gel precursor solution. After removal of the organic matrix with deep UV irradiation, arrays of Au/TiO2 composite nanoparticles with different compositions or particle sizes can be easily produced. Different photoluminescence (PL) emission spectra from an organic-inorganic hybrid film and arrays of Au/TiO2 composite nanoparticles indicate that TiO2 and Au components exist as separate state in the initial hybrid film and form composite nanoparticles after the removal of the block copolymer matrix.
Jang, Yu Jin,Jang, Yoon Hee,Steinhart, Martin,Kim, Dong Ha The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.4
<p>Carbonaceous nanotubes decorated with metal nanoparticles were obtained by heating inverse block copolymer micelles loaded with metal precursors inside nanoporous alumina. Simple changes in the applied temperature profile allowed tailoring of the wall morphology of the nanotubes and the spatial arrangement of the metal nanoparticles.</p> <P>Graphic Abstract</P><P>Carbonaceous nanotubes containing metal nanoparticles with a tailored configuration and order were obtained by heating UV-stabilized block copolymer micelles. <img src='http://pubs.rsc.org/ej/CC/2011/c1cc15597k/c1cc15597k-ga.gif'> </P>
Xue Li,Jun Fu,Martin Steinhart,김동하,Wolfgang Knoll 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.6
A simple approach to prepare arrays of Au/TiO2 composite nanoparticles by using Au-loaded block copolymers as templates combined with a sol-gel process is described. The organic-inorganic hybrid films with closely packed inorganic nanodomains in organic matrix are produced by spin coating the mixtures of polystyrene-block-poly(ethylene oxide) (PS-b-PEO)/HAuCl4 solution and sol-gel precursor solution. After removal of the organic matrix with deep UV irradiation, arrays of Au?/?TiO2 composite nanoparticles with different compositions or particle sizes can be easily produced. Different photoluminescence (PL) emission spectra from an organic-inorganic hybrid film and arrays of Au/TiO2 composite nanoparticles indicate that TiO2 and Au components exist as separate state in the initial hybrid film and form composite nanoparticles after the removal of the block copolymer matrix.
Jang, Yoon Hee,Kochuveedu, Saji Thomas,Jang, Yu Jin,Shin, Hae-Young,Yoon, Seokhyun,Steinhart, Martin,Kim, Dong Ha Elsevier 2011 Carbon Vol.49 No.6
<P><B>Abstract</B></P><P>Ordered arrays of Au or Ag nanoparticles supported on two-dimensional graphitic carbon films were prepared by direct carbonization of stabilized asymmetric polystyrene-<I>block</I>-poly(4-vinyl pyridine) (PS-<I>b</I>-P4VP) inverse micellar films loaded with metal precursors. Crosslinked PS-<I>b</I>-P4VP thin film templates with metal precursors selectively distributed in P4VP domains were converted to carbonaceous thin films having well-defined, highly dispersed metal nanoparticle (NP) arrays by ultraviolet (UV) irradiation under vacuum and subsequent carbonization. Mesoporous carbon films were also obtained after extracting the metal NPs by sonication in selected solvents. PS-<I>b</I>-P4VP was employed not only as carbon source, but also as template for introducing metal NPs in a nanopatterned configuration. The characteristic features and properties of thus generated hybrid carbon nanostructures were investigated by microscopy, UV–visible spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction measurement, and Raman spectroscopy.</P>
Nanostructured gold films for SERS by block copolymer-templated galvanic displacement reactions.
Wang, Yong,Becker, Michael,Wang, Li,Liu, Jinquan,Scholz, Roland,Peng, Juan,Gö,sele, Ulrich,Christiansen, Silke,Kim, Dong Ha,Steinhart, Martin American Chemical Society 2009 Nano letters Vol.9 No.6
<P>Up to now, little effort has been made to exploit large-area high-throughput patterning by block copolymer (BCP) lithography to generate nanostructured substrates with periods well below 100 nm for surface-enhanced Raman scattering (SERS). We show that simple BCP-templated galvanic displacement reactions yield dense arrays of mushroom-shaped gold nanopillars with a period of 50 nm. The nanoporous BCP films used as templates were obtained by swelling-induced reconstruction of reverse micelle monolayers deposited on silicon wafers. Coupling of adjacent mushroom caps almost impinging on each other combined with their strong local curvature results in a high spatial density of hot spots in the narrow gaps between them. Thus, substrates characterized by high SERS efficiencies are obtained.</P>
Jang, Yu Jin,Jang, Yoon Hee,Han, Sang-Beom,Khatua, Dibyendu,Hess, Claudia,Ahn, Hyungju,Ryu, Du Yeol,Shin, Kwanwoo,Park, Kyung-Won,Steinhart, Martin,Kim, Dong Ha American Chemical Society 2013 ACS NANO Vol.7 No.2
<P>A synthetic strategy for the fabrication of graphitic carbon nanomaterials containing highly dispersed arrays of metal nanoparticles is reported. This synthetic strategy involves successive deposition of inverse micelle monolayers containing a metal precursor and reduction of the latter, followed by direct carbonization of the obtained multilayer structure of inverse micelles containing metal nanoparticles. Thus, a “direct-carbonization” concept, in which the block copolymer simultaneously serves as soft template and as carbon source, was combined with a multilayer buildup protocol. The inner architecture of the multilayer structures consisting of carbon and metal nanoparticles was studied by X-ray reflectivity, grazing incidence small-angle X-ray scattering, and cross-sectional transmission electron microscopy imaging. The hexagonal near ordering of the metal nanoparticles in the block copolymer micelle multilayers was by and large conserved after carbonization. The resulting carbon structures containing multilayers of highly dispersed metal nanoparticles exhibit superior electrocatalytic activity in formic acid and methanol oxidation, suggesting that they are promising electrode materials for fuel cells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-2/nn3056115/production/images/medium/nn-2012-056115_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn3056115'>ACS Electronic Supporting Info</A></P>