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Seo K.,KAIST | Yoon H.,KAIST | Ryu S.-W.,KAIST | Lee S.,KAIST | And 5 more authors.
ACS Nano | Year: 2010

We report the synthesis of free-standing MnSi nanowires via a vapor transport method with no catalyst and measurements of their electrical and magnetic properties for the first time. The single-crystalline MnSi nanowire ensemble with a simple cubic (B20) crystal structure shows itinerant helimagnetic properties with a Tc of about 30 K. A single MnSi nanowire device was fabricated by a new method using photolithography and a nanomanipulator that produces good ohmic contacts. The single-nanowire device measurements provide large (20%) negative magnetoresistance and very low electrical resistivity of 544 μΩcm for the MnSi nanowire. © 2010 American Chemical Society.


Yoon S.B.,Center for Nanoscience and Quantum Metrology | Woo B.C.,Center for Nanoscience and Quantum Metrology | Chung S.J.,Korea Research Institute of Bioscience and Biotechnology | Yun W.S.,Center for Nanoscience and Quantum Metrology
Journal of Nanoscience and Nanotechnology | Year: 2012

We report on the fabrication of the nanoporous TiO 2 hollow capsules using core-shell silica nanoparticle templates. The thickness of the capsules can be simply controlled by varying the amount of the TiO 2 precursor. The resulting nanoporous capsules exhibited the high specific surface area and the large pore volume of 103~180 m2/g and 0.40-0.86 cm3/g, respectively. Photocatalytic activity of the TiO 2 hollow capsules was also investigated and compared to that of the commercial TiO 2 nanoparticles. Copyright © 2012 American Scientific Publishers.

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