Mechanisms of oriented crystallization in artificial epitaxy (graphoepitaxy)

Givargizov, E. I.

doi:10.1016/0040-6090(90)90468-s

Cited by 23 publications

(15 citation statements)

References 26 publications

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“…In graphoepitaxy, by contrast, the surface relief structure of the substrate directs epitaxial growth of an overlying crystalline film [185]. This relief structure can have a length scale much larger than the lattice parameter of the film and the substrate need not be a single crystal or even crystalline [186][187][188]. Both techniques have been adapted to pattern the organization of block copolymers.…”

Section: Epitaxymentioning

confidence: 99%

Patterning with block copolymer thin films

Segalman

2005

Materials Science and Engineering: R: Reports

935

921

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The nanometer-scale architectures in thin films of self-assembling block copolymers have inspired a variety of new applications. For example, the uniformly sized and shaped nanodomains formed in the films have been used for nanolithography, nanoparticle synthesis, and high-density information storage media. Imperative to all of these applications, however, is a high degree of control over orientation of the nanodomains relative to the surface of the film as well as control over order in the plane of the film. Induced fields including electric, shear, and surface fields have been demonstrated to influence orientation. Both heteroepitaxy and graphoepitaxy can induce positional order on the nanodomains in the plane of the film. This article will briefly review a variety of mechanisms for gaining control over block copolymer order as well as many of the applications of these materials. Particular attention is paid to the potential of perfecting long-range two-dimensional order over a broader range of length scales and the extension of these concepts to functional materials and more complex architectures. #

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Section: Epitaxymentioning

confidence: 99%

Patterning with block copolymer thin films

Segalman

2005

Materials Science and Engineering: R: Reports

935

921

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“…This technique has previously been successfully employed to investigate thin films on highly oriented PTFE, although with a different experimental set-up. [14±16] Evidence has been gathered for meso-epitaxial growth; i.e., the alignment/orientation behavior of HBC-C8,2 seems to be dictated by a combination of molecular epitaxy (commensurate growth guided by lattice matching criteria) [8,9,17] and surface-topology-induced epitaxy (ªgraphoepitaxyº, where surface patterns generate orientation), [18][19][20] as will be briefly discussed below. (A full description and detailed analysis of these X-ray results will be published elsewhere).…”

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confidence: 99%

“…From the peak positions, the 2D unit cell was determined in which the HBC-C8,2 columns are arranged (cut perpendicular to the surface and the columns). Three orientations of a quasi-hexagonal structure, denoted HBC-C8,2 0 , HBC-C8,2 19.1 , and HBC-C8,2 35.2 (respectively in Figs. 3d, e, f) have been found to coexist. The differences between these phases lie in the arrangement with respect to the polymer alignment layer, which is probably related to dissimilar growth mechanisms.…”

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confidence: 99%

Meso‐Epitaxial Solution‐Growth of Self‐Organizing Discotic Liquid‐Crystalline Semiconductors

et al. 2003

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Conjugated polymer actuators developed over the last decade have now reached the early stages of commercialization, particularly for use in biomedical devices, such as the blood vessel connector shown in the Figure. This article reviews the motivation for using this class of actuator, the types of devices that have been fabricated, and some of the biomedical applications that are being developed. Recommendations are also presented for future work. CommunicationsSubstituted hexabenzocoronenes (HBCs) form films with supramolecularly ordered columnar stacks that are uniaxially oriented onto poly(tetrafluoroethylene) alignment layers (see Figure). In field-effect transistor (FET) tests, mobilities of up to 10 ±3 cm 2 V ±1 s ±1and high on±off ratios of more than 10 4 were derived for these aligned HBC films, characteristics superior to FETs prepared from isotropic HBC layers.

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“…Silica microspheres of 280 ± 5 nm diameter produced by the Stöber method [17] were organized into planar silica colloidal crystals by the evaporative deposition method. [18] The surface of the spheres and substrate was then modified with chlorosilane 1, [19] where displacement of the chlorine by silica silanol groups produces a surface layer of polymerizable groups. This step is essential to obtain a material with good adhesion to the substrate.…”

Section: A Polychromic Fast Response Metallopolymer Gel Photonic Crymentioning

confidence: 99%