Molecular orientation imaging of single-layer organic semiconducting molecules by polarization Raman microscopy

2020 ◽  
Author(s):  
Toki Moriyama ◽  
Takayuki Umakoshi ◽  
Koki Taguchi ◽  
Yoshiaki Hattori ◽  
Masatoshi Kitamura ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Single Layer ◽  
Raman Microscopy ◽  
Orientation Imaging ◽  
Organic Semiconducting Molecules

Single Layer Graphene for Estimation of Axial Spatial Resolution in Confocal Raman Microscopy Depth Profiling

2018 ◽  
Vol 91 (1) ◽  
pp. 1049-1055 ◽  
Author(s):  
Carol Korzeniewski ◽  
Jay P. Kitt ◽  
Saheed Bukola ◽  
Stephen E. Creager ◽  
Shelley D. Minteer ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Depth Profiling ◽  
Single Layer ◽  
Raman Microscopy ◽  
Single Layer Graphene ◽  
Confocal Raman Microscopy ◽  
Layer Graphene ◽  
Confocal Raman

Characterising the Morphology of Polymer Articles Using Polarised FTIR Reflectance and Raman Microscopies.

1997 ◽  
Vol 3 (S2) ◽  
pp. 839-840
Author(s):  
N.J. Everall ◽  
J.M. Chalmers
Keyword(s):  
Data Analysis ◽  
Molecular Orientation ◽  
Multivariate Calibration ◽  
Mechanical Performance ◽  
Raman Microscopy ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Specular Reflectance ◽  
Calibration Techniques ◽  
Polymer Crystallinity

The optical and mechanical performance of polymer articles is often very strongly influenced by the crystallinity and degree of molecular orientation in the polymer. It is therefore important to have available techniques for measuring and mapping these parameters over article surfaces and through wall thicknesses, on scales from centimetres to microns. It is also desirable that these techniques do not in themselves perturb the morphology of the polymer, for example by introducing excess orientation or crystallinity through sectioning.In this paper we will show how Raman microscopy can provided a useful approach for mapping polymer crystallinity on the micron scale, particularly when coupled with multivariate calibration techniques for data analysis. The acquisition and treatment of data to obtain crystallinity information will be described in detail. We will also describe the development and application of polarised FTIR specular reflectance and attenuated total reflection (ATR) microbeam techniques for quantifying and mapping surface orientation of polymer articles.

Interaction strength and molecular orientation of a single layer of pentacene in organic-metal interface and organic-organic heterostructure

2008 ◽  
Vol 77 (11) ◽  
Author(s):  
Mirco Chiodi ◽  
Luca Gavioli ◽  
Marco Beccari ◽  
Valeria Di Castro ◽  
Albano Cossaro ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Interaction Strength ◽  
Single Layer ◽  
Organic Metal ◽  
Metal Interface

Molecular Orientation Imaging of Liquid Crystals by Tunable-Polarization-Mode Coherent Anti-Stokes Raman Scattering Microscopy

2013 ◽  
Vol 6 (7) ◽  
pp. 072401 ◽  
Author(s):  
Takeo Minamikawa ◽  
Tatsuro Takagi ◽  
Hirohiko Niioka ◽  
Makoto Kurihara ◽  
Nobuyuki Hashimoto ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Raman Scattering ◽  
Molecular Orientation ◽  
Polarization Mode ◽  
Orientation Imaging ◽  
Anti Stokes

Nanoscale mapping of excitonic processes in single-layer MoS2 using tip-enhanced photoluminescence microscopy

Nanoscale ◽  
2016 ◽  
Vol 8 (20) ◽  
pp. 10564-10569 ◽  
Author(s):  
Weitao Su ◽  
Naresh Kumar ◽  
Sandro Mignuzzi ◽  
Jason Crain ◽  
Debdulal Roy
Keyword(s):  
Spatial Resolution ◽  
Single Layer ◽  
Raman Microscopy ◽  
Enhanced Photoluminescence ◽  
20 Nm ◽  
Photoluminescence Microscopy ◽  
First Time

Excitonic processes in single-layer MoS2 are mapped for the first time using tip-enhanced photoluminescence and Raman microscopy with 20 nm spatial resolution.

Crystalline order to a resolution of 4.7 A in the sheath of Methanospirilium hungatii: A cross-beta structure

1984 ◽  
Vol 42 ◽  
pp. 214-215
Author(s):  
Murray Stewart ◽  
T.J. Beveridge ◽  
D. Sprott
Keyword(s):  
Cell Wall ◽  
Single Layer ◽  
Uranyl Acetate ◽  
Optical Diffraction ◽  
Tube Axis ◽  
Basic Subunit ◽  
Beta Structure ◽  
Diffraction Patterns ◽  
Protein Treatment ◽  
General Appearance

The archaebacterium Methanospirillum hungatii has a sheath as part of its cell wall which is composed mainly of protein. Treatment with dithiothreitol or NaOH released the intact sheaths and electron micrographs of this material negatively stained with uranyl acetate showed flattened hollow tubes, about 0.5 μm diameter and several microns long, in which the patterns from the top and bottom were superimposed. Single layers, derived from broken tubes, were also seen and were more simply analysed. Figure 1 shows the general appearance of a single layer. There was a faint axial periodicity at 28.5 A, which was stronger at irregular multiples of 28.5 A (3 and 4 times were most common), and fine striations were also seen at about 3° to the tube axis. Low angle electron diffraction patterns (not shown) and optical diffraction patterns (Fig. 2) from these layers showed a complex meridian (as a result of the irregular nature of the repeat along the tube axis) which showed a clear maximum at 28.5 A, consistent with the basic subunit spacing.

Polarized microbeam FT-IR analysis of single fibers

1996 ◽  
Vol 54 ◽  
pp. 206-207
Author(s):  
Liling Cho ◽  
David L. Wetzel
Keyword(s):  
Molecular Orientation ◽  
Transition Point ◽  
Polymer Fibers ◽  
Single Fiber ◽  
Wire Grid ◽  
Polyester Fibers ◽  
Ft Ir ◽  
Ir Analysis ◽  
The Relationship ◽  
Wire Grid Polarizer

Polarized infrared microscopy has been used for forensic purposes to differentiate among polymer fibers. Dichroism can be used to compare and discriminate between different polyester fibers, including those composed of polyethylene terephthalate that are frequently encountered during criminal casework. In the fiber manufacturering process, fibers are drawn to develop molecular orientation and crystallinity. Macromolecular chains are oriented with respect to the long axis of the fiber. It is desirable to determine the relationship between the molecular orientation and stretching properties. This is particularly useful on a single fiber basis. Polarized spectroscopic differences observed from a single fiber are proposed to reveal the extent of molecular orientation within that single fiber. In the work presented, we compared the dichroic ratio between unstretched and stretched polyester fibers, and the transition point between the two forms of the same fiber. These techniques were applied to different polyester fibers. A fiber stretching device was fabricated for use on the instrument (IRμs, Spectra-Tech) stage. Tension was applied with a micrometer screw until a “neck” was produced in the stretched fiber. Spectra were obtained from an area of 24×48 μm. A wire-grid polarizer was used between the source and the sample.

Differentiation Processes of the Ocellar Retina of the Honeybee (Apis Mellifera L.)

1990 ◽  
Vol 48 (3) ◽  
pp. 430-431
Author(s):  
Maria Anna Pabst
Keyword(s):  
Apis Mellifera ◽  
Distal Part ◽  
Cell Layer ◽  
Single Layer ◽  
Photoreceptor Cells ◽  
Distal Segment ◽  
Compound Eyes ◽  
Thin Sections ◽  
Ultrastructural Studies ◽  
Adult Worker

In addition to the compound eyes, honeybees have three dorsal ocelli on the vertex of the head. Each ocellus has about 800 elongated photoreceptor cells. They are paired and the distal segment of each pair bears densely packed microvilli forming together a platelike fused rhabdom. Beneath a common cuticular lens a single layer of corneagenous cells is present.Ultrastructural studies were made of the retina of praepupae, different pupal stages and adult worker bees by thin sections and freeze-etch preparations. In praepupae the ocellar anlage consists of a conical group of epidermal cells that differentiate to photoreceptor cells, glial cells and corneagenous cells. Some photoreceptor cells are already paired and show disarrayed microvilli with circularly ordered filaments inside. In ocelli of 2-day-old pupae, when a retinogenous and a lentinogenous cell layer can be clearly distinguished, cell membranes of the distal part of two photoreceptor cells begin to interdigitate with each other and so start to form the definitive microvilli. At the beginning the microvilli often occupy the whole width of the developing rhabdom (Fig. 1).

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