Absent Bow-Tie Sign in Knee MRI

Lee, Young Uk; Park, Jun Yong; Chung, Eun Chul; Youn, Eun Kyung; Lee, Chang Seok; Ji, Joon Ha; Lee, Kwang Chul

doi:10.3348/jkrs.2000.42.1.181

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“…This band is not far from the 1.537 eV emission recently reported by Albin et al 45 for stoichiometric singlecrystal CdTe and further ascribed to donor−acceptor pair recombination, possibly associated with Na or Li impurities. 47 However, while unintentional Na contamination in nanowire samples grown from colloidal Au (red solid line in Figure 6a) may be associated with the as-synthesized 48 nanocatalyst solution, this is unlikely to be the case for nanowire grown using evaporated Au thin films (red dashed line in Figure 6a). Therefore, the actual origin of the 1.539 eV band remains at present uncertain, and needs to be further investigated.…”

Section: Nano Lettersmentioning

confidence: 99%

CdTe Nanowires by Au-Catalyzed Metalorganic Vapor Phase Epitaxy

et al. 2017

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We report on the first Au-catalyzed growth of CdTe nanowires by metalorganic vapor phase epitaxy. The nanowires were obtained by a separate precursors flow process in which (i) di-isopropyl-telluride (PrTe) was first flowed through the reactor to ensure the formation of liquid Au-Te alloy droplets, and (ii) after purging with pure H to remove unreacted PrTe molecules from the vapor and the growth surface, (iii) dimethylcadmium (MeCd) was supplied to the vapor so that Cd atoms could enter the catalyst droplets, leading to nanowire self-assembly. CdTe nanowires were grown between 485 and 515 °C on (111)B-GaAs substrates, the latter preliminary deposited with a 2 μm thick (111)-oriented CdTe buffer layer onto which Au nanoparticles were provided. As-grown CdTe nanowires were vertical ([111]-aligned) straight segments of constant diameter and showed an Au-rich nanodroplet at their tips, the contact angle between the droplets and the nanowires being ∼130°. The nanowire axial growth rate appeared kinetics-limited with an activation energy ∼57 kcal/mol. However, the growth rate turned independent from the nanowire diameter. Present data are interpreted by a theoretical model explaining the nanowire growth through the diffusion transport of Te adatoms under the assumption that their growth occurs during the MeCd-flow process step. Low-temperature cathodoluminescence spectra recorded from single nanowires showed a well-resolved band-edge emission typical of zincblend CdTe along with a dominant band peaked at 1.539 eV.

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Section: Nano Lettersmentioning

confidence: 99%