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Large-Scale Synthesis of Highly Pure Novel Cadmium Semi-Spheres and Their Anomalous Optical Properties

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Highly pure and large-scale novel cadmium (Cd) semi-spheres were prepared via Chemical Vapor Deposition (CVD). The growth process is described with multi-steps of Vapor-Liquid-Solid (VLS) and decomposition of CdS nanostructure in Ar(90%)+H2 (10%) mixture gas stream at definite temperature and selected zone. In contrast to previous Cd nanostructures, our individual Cd semi-spheres show strong room-temperature photoluminescence (PL) at around 591 nm, which is detected for the first time. Its long lived (>∼1.5 ns) electronic state by time-resolved PL supports the origin of strong emission, which is attributed to radiative recombination of electrons in the s, p conduction band near the Fermi surface and the holes at the d-bands or local microstructures generated by UV-visible laser excitation. It is a plasmonic band as that in Au, Ag, Cu tuned by sizes. Strong surface enhanced Raman scattering (SERS) of pyridine species have been detected from this Cd semi-sphere, as strong as the silver metals does for SERS agents. The above optical responses has strong relation to their growth process and as formed microstructures in one sphere. It reflects that such Cd spheres may be a much cheaper candidates for applications in LEDs and other optoelectronic devices, for example, the plasmonic enhanced solar cells.
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Document Type: Research Article

Publication date: December 1, 2014

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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