Topic
Single crystal
About: Single crystal is a research topic. Over the lifetime, 59617 publications have been published within this topic receiving 870828 citations.
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TL;DR: The effect of high pressure on the crystal structures of α-, β-, and γ-glycine has been investigated in this article, where a new polymorph, δ-Glycine, was obtained from β glycine.
Abstract: The effect of high pressure on the crystal structures of α-, β-, and γ-glycine has been investigated. A new polymorph, δ-glycine, is obtained from β glycine. δ-Glycine is monoclinic, P21/a, a = 11.156(4), b = 5.8644(11), c = 5.3417(17) A, β = 125.83(4)° at 1.9 GPa. The transition, which occurs between 0 and 0.8 GPa, proceeds from a single crystal of β-glycine to a single crystal of δ-glycine, resulting in an equal number of NH···O hydrogen bonds but an increase in the number and strength of CH···O hydrogen bonds, which act to close-up “holes” that are formed within the layers of β-glycine in the centers of R-type hydrogen-bonded motifs. Trigonal γ-glycine begins to undergo a transition to another high-pressure phase, e-glycine, at 1.9 GPa, but the transformation is destructive; it is essentially complete at 4.3 GPa. The structure is monoclinic Pn, a = 4.8887(10), b = 5.7541(11), c = 5.4419(11) A, β = 116.682(10)° at 4.3 GPa. The structure consists of layers similar to those observed in α-glycine with inte...
210 citations
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TL;DR: In this paper, a bulk crystal of γ-glycine has been grown at ambient temperature from aqueous solution in the presence of small amount of sodium chloride, and the chemical composition of the grown crystal was determined by CHN analysis and infrared spectroscopy.
209 citations
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TL;DR: In this article, single crystal ZnO nanowires were synthesized by the thermal decomposition of zinc acetate dihydrate at 300°C in air for 3h without a catalyst.
209 citations
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209 citations
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TL;DR: This work detail a reproducible method for chemical vapor deposition of monolayer, single-crystal flakes of 1T'-MoTe2 and its implementation in next-generation nanoelectronic devices.
Abstract: Growth of transition metal dichalcogenide (TMD) monolayers is of interest due to their unique electrical and optical properties. Films in the 2H and 1T phases have been widely studied but monolayers of some 1T′-TMDs are predicted to be large-gap quantum spin Hall insulators, suitable for innovative transistor structures that can be switched via a topological phase transition rather than conventional carrier depletion [Qian et al. Science 2014, 346, 1344−1347]. Here we detail a reproducible method for chemical vapor deposition of monolayer, single-crystal flakes of 1T′-MoTe2. Atomic force microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy confirm the composition and structure of MoTe2 flakes. Variable temperature magnetotransport shows weak antilocalization at low temperatures, an effect seen in topological insulators and evidence of strong spin–orbit coupling. Our approach provides a pathway to systematic investigation of monolayer, single-crystal 1T′-Mo...
208 citations