Water-induced room-temperature transformation of straight Ge/Si core/shell nanowires into circular silica nanotubes
Literature Information
Byeong Geun Kim, Byung-Sung Kim, Dongmok Whang, Heon-Jin Choi, Soon-Mok Choi, Won-Seon Seo, Seong-Min Jeong
A facile method for producing circular silica nanotubes starting from straight Ge/Si core/shell nanowires is described. Single-crystalline Ge nanowires were selected as templates and sacrificing materials because they can be easily oxidized and the resulting Ge oxide is water soluble. Si shell layers were deposited via sputtering on the as-grown Ge nanowires, resulting in the formation of Ge/Si core/shell nanowires. The as-synthesized Ge/Si core/shell nanowires were dipped in water at room temperature and amorphous silica nanotubes were produced after 14 days. The characteristics of the transformation from the Ge/Si core/shell nanowires into silica nanotubes were observed and a mechanism is proposed. We also investigated how circular silica nanotubes could be fabricated, and the findings indicate that the strong surface tension of water results in the formation of Ge/Si core/shell nanowires in which the thickness of the shell layers is non-uniform. These were converted into circular silica nanotubes, on the evaporation of the water. We believe that this method can provide fundamental insights into the fabrication, shape control and self-assembly of nanostructures.
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Source Journal
CrystEngComm

CrystEngComm is the forum for the design and understanding of crystalline materials. We welcome studies on the investigation of molecular behaviour within crystals, control of nucleation and crystal growth, engineering of crystal structures, and construction of crystalline materials with tuneable properties and functions. We publish hypothesis-driven research into… how crystal design affects thermodynamics, phase transitional behaviours, polymorphism, morphology control, solid state reactivity (crystal-crystal solution-crystal, and gas-crystal reactions), optoelectronics, ferroelectric materials, non-linear optics, molecular and bulk magnetism, conductivity and quantum computing, catalysis, absorption and desorption, and mechanical properties. Using Techniques and methods including… Single crystal and powder X-ray, electron, and neutron diffraction, solid-state spectroscopy, spectrometry, and microscopy, modelling and data mining, and empirical, semi-empirical and ab-initio theoretical evaluations. On crystalline and solid-state materials. We particularly welcome work on MOFs, coordination polymers, nanocrystals, host-guest and multi-component molecular materials. We also accept work on peptides and liquid crystals. All papers should involve the use or development of a design or optimisation strategy. Routine structural reports or crystal morphology descriptions, even when combined with an analysis of properties or potential applications, are generally considered to be outside the scope of the journal and are unlikely to be accepted.










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