Self-organization of polymer nanoneedles into large-area ordered flowerlike arrays

2009 ◽  
Vol 95 (9) ◽  
pp. 091902 ◽  
Author(s):  
Dong Wu ◽  
Qi-Dai Chen ◽  
Bin-Bin Xu ◽  
Jian Jiao ◽  
Ying Xu ◽  
...  
Keyword(s):  
Self Organization ◽  
Large Area

scholarly journals Self-Organization-Based Fabrication of Stable Noble-Metal Nanostructures on Large-Area Dielectric Substrates

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Victor Ovchinnikov ◽  
Andriy Shevchenko
Keyword(s):  
Noble Metal ◽  
Cost Effective ◽  
Dielectric Substrate ◽  
Self Organization ◽  
Metal Nanostructures ◽  
Large Area ◽  
Dielectric Substrates ◽  
Self Organized ◽  
Potential Applications ◽  
Noble Metal Nanostructures

A cost-effective fabrication of random noble-metal nanostructures with a feature size of the order of 10 nm on a large-area dielectric substrate is described. The method combines dry etching of the substrate through a self-organized metal mask with a directional deposition of a multilayered metal film. The technique allows one to create metal nanoislands on a nanopatterned dielectric template with an enhanced adhesion between the metal and the dielectric. The use of the adhesion layer—that makes the structures stable—is important in view of variety of optical and other potential applications of the structures. We observe that the presence of the adhesion sublayer dramatically influences both the morphological and optical properties of the structures. The results of this work can be of interest in regard to the development of new approaches to self-organization-based nanofabrication of extremely small metal and metal-dielectric nanostructures on large-area substrates.

scholarly journals Graphene: Large‐Area Single‐Crystal Graphene via Self‐Organization at the Macroscale (Adv. Mater. 45/2020)

2020 ◽  
Vol 32 (45) ◽  
pp. 2070340
Author(s):  
Huy Quang Ta ◽  
Alicja Bachmatiuk ◽  
Rafael Gregorio Mendes ◽  
David J. Perello ◽  
Liang Zhao ◽  
...  
Keyword(s):  
Single Crystal ◽  
Self Organization ◽  
Large Area

scholarly journals Ligand-Assisted Formation of Graphene/Quantum Dot Monolayers with Improved Morphological and Electrical Properties

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 723
Author(s):  
Aleksandr P. Litvin ◽  
Anton A. Babaev ◽  
Peter S. Parfenov ◽  
Aliaksei Dubavik ◽  
Sergei A. Cherevkov ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Self Organization ◽  
Hybrid Films ◽  
Large Area ◽  
Covalently Bonded ◽  
Reduced Graphene ◽  
Coating Method ◽  
Pbs Quantum Dots ◽  
Highly Uniform ◽  
Post Deposition

Hybrid nanomaterials based on graphene and PbS quantum dots (QDs) have demonstrated promising applications in optoelectronics. However, the formation of high-quality large-area hybrid films remains technologically challenging. Here, we demonstrate that ligand-assisted self-organization of covalently bonded PbS QDs and reduced graphene oxide (rGO) can be utilized for the formation of highly uniform monolayers. After the post-deposition ligand exchange, these films demonstrated high conductivity and photoresponse. The obtained films demonstrate a remarkable improvement in morphology and charge transport compared to those obtained by the spin-coating method. It is expected that these materials might find a range of applications in photovoltaics and optoelectronics.

scholarly journals Large‐Area Single‐Crystal Graphene via Self‐Organization at the Macroscale

2020 ◽  
Vol 32 (45) ◽  
pp. 2002755
Author(s):  
Huy Quang Ta ◽  
Alicja Bachmatiuk ◽  
Rafael Gregorio Mendes ◽  
David J. Perello ◽  
Liang Zhao ◽  
...  
Keyword(s):  
Single Crystal ◽  
Self Organization ◽  
Large Area

Convergent Beam Electron Diffraction

1978 ◽  
Vol 36 (3) ◽  
pp. 304-315
Author(s):  
G. Lehmpfuhl
Keyword(s):  
Electron Diffraction ◽  
Diffraction Pattern ◽  
Crystal Surface ◽  
Diffraction Spot ◽  
Crystal Thickness ◽  
Large Area ◽  
Electron Microscopic ◽  
Additional Information ◽  
Microscopic Investigations

Introduction In electron microscopic investigations of crystalline specimens the direct observation of the electron diffraction pattern gives additional information about the specimen. The quality of this information depends on the quality of the crystals or the crystal area contributing to the diffraction pattern. By selected area diffraction in a conventional electron microscope, specimen areas as small as 1 µ in diameter can be investigated. It is well known that crystal areas of that size which must be thin enough (in the order of 1000 Å) for electron microscopic investigations are normally somewhat distorted by bending, or they are not homogeneous. Furthermore, the crystal surface is not well defined over such a large area. These are facts which cause reduction of information in the diffraction pattern. The intensity of a diffraction spot, for example, depends on the crystal thickness. If the thickness is not uniform over the investigated area, one observes an averaged intensity, so that the intensity distribution in the diffraction pattern cannot be used for an analysis unless additional information is available.

TEM Study of a Tilt Boundary in Hot-Pressed Silicon

1981 ◽  
Vol 39 ◽  
pp. 160-161
Author(s):  
C. B. Carter ◽  
J. Rose ◽  
D. G. Ast
Keyword(s):  
Electron Diffraction ◽  
Imaging Technique ◽  
Interface Structure ◽  
Large Area ◽  
Weak Beam ◽  
Lattice Fringe ◽  
Electron Diffraction Technique ◽  
Tilt Boundaries ◽  
Beam Technique ◽  
Twist Boundaries

The hot-pressing technique which has been successfully used to manufacture twist boundaries in silicon has now been used to form tilt boundaries in this material. In the present study, weak-beam imaging, lattice-fringe imaging and electron diffraction techniques have been combined to identify different features of the interface structure. The weak-beam technique gives an overall picture of the geometry of the boundary and in particular allows steps in the plane of the boundary which are normal to the dislocation lines to be identified. It also allows pockets of amorphous SiO2 remaining in the interface to be recognized. The lattice-fringe imaging technique allows the boundary plane parallel to the dislocation to be identified. Finally the electron diffraction technique allows the periodic structure of the boundary to be evaluated over a large area - this is particularly valuable when the dislocations are closely spaced - and can also provide information on the structural width of the interface.

P20 phosphor on polyimide as a large area high-resolution transmission screen for slow scan CCD systems

1995 ◽  
Vol 53 ◽  
pp. 20-21
Author(s):  
C. C. Ahn ◽  
S. Karnes ◽  
M. Lvovsky ◽  
C. M. Garland ◽  
H. A. Atwater ◽  
...  
Keyword(s):  
Mechanical Stability ◽  
High Energy ◽  
Practical Implementation ◽  
Line Pair ◽  
Modulation Transfer ◽  
Large Area ◽  
Ccd Imaging ◽  
Transmission Electron ◽  
The One ◽  
Beam Broadening

The bane of CCD imaging systems for transmission electron microscopy at intermediate and high voltages has been their relatively poor modulation transfer function (MTF), or line pair resolution. The problem originates primarily with the phosphor screen. On the one hand, screens should be thick so that as many incident electrons as possible are converted to photons, yielding a high detective quantum efficiency(DQE). The MTF diminishes as a function of scintillator thickness however, and to some extent as a function of fluorescence within the scintillator substrates. Fan has noted that the use of a thin layer of phosphor beneath a self supporting 2μ, thick Al substrate might provide the most appropriate compromise for high DQE and MTF in transmission electron microcscopes which operate at higher voltages. Monte Carlo simulations of high energy electron trajectories reveal that only little beam broadening occurs within this thickness of Al film. Consequently, the MTF is limited predominantly by broadening within the thin phosphor underlayer. There are difficulties however, in the practical implementation of this design, associated mostly with the mechanical stability of the Al support film.

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