Anthracene Fibers Grown in a Microstructured Optical Fiber for X-ray Detection

Abstract

Anthracene fibers are grown inside a microstructured quartz matrix to form a multicore optical fiber for X-ray detection. A modified fiber growth method for single crystal anthracene from the melt via the Bridgman-Stockbarger technique is presented. The anthracene fiber is characterized by using spectrophotometry, Raman spectroscopy, and X-ray diffraction. These results show the anthracene grown in fiber has high purity and a crystal structure similar to anthracene grown from liquid, vapor, and melt techniques. As an X-ray detector, the output is 12%–16% efficient between the energy ranges of 40 and 10 keV. The effect of materials and fiber processing are discussed.

Direct Observation of Anthracene Clusters at Ice Surfaces

“…Further, emission in the liquid samples is only observed at wavelengths shorter than 500 nm, but several distinct peaks are observed at longer wavelengths in the solid sample. The emission features of the powdered sample are consistent with emission from crystalline anthracene, [28][29][30][31] and indicate self-association of two or more anthracene molecules. Figure 1(c) shows emission spectra acquired at the surface of frozen solutions containing 0.2 µM anthracene in DI water, aqueous 0.6 M NaCl, and 1-octanol.…”

Exciton Dynamics in Anthracene Nanoaggregates

“…The XRD pattern has been compared with those of the crystalline forms reported earlier. 41,42 In the case of the nanoaggregate sample, we observe a weak but broad featureless XRD band in the range of 15−35°of the diffraction angle with a few intense lines superimposed on it (Figure 2). Those sharp lines are perfectly coincident with those observed in the XRD pattern of the crystalline state.…”

Highly Oriented and Crystalline Films of a Phenyl-Substituted Polythiophene Prepared by Epitaxy: Structural Model and Influence of Molecular Weight

“…Large surfaces of oriented films are produced in a homemade zone melting system as shown in Figure b. The growth front of NA moves at 20 μm/s, which yields NA crystals elongated in the direction of the a NA axis with a dominant (001) contact plane (monoclinic crystal structure: a = 8.09 Å, b = 5.95 Å, c = 8.65 Å, β = 124.4°) …”

“…The growth front of NA moves at 20 μm/s, which yields NA crystals elongated in the direction of the a NA axis with a dominant (001) contact plane (monoclinic crystal structure: a = 8.09 Å, b = 5.95 Å, c = 8.65 Å, β = 124.4°). 37 Figure 1 shows the polarized optical microscopy images of two highly oriented PDOPT films of different M n s grown by slow directional epitaxial crystallization. Both PDOPT samples exhibit remarkable orientation as illustrated by the color change from deep purple/red to almost colorless when the light polarization (Pol) changes from parallel to perpendicular with respect to the chain direction.…”

“…Epitaxy. The relative orientation of PDOPT on NA corresponds to (100) PDOPT // 01) NA and c PDOPT // a NA (the growth direction of naphthalene using a Bridgman type of growth corresponds to the (100) NA direction 37 ). To determine if epitaxy is a possible mechanism for the observed orientation of PDOPT chains, it is necessary to compare the unit cell parameters of the PDOPT overlayer and the naphthalene substrate.…”