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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.


PubMed | Center for Nanoscience and Quantum Metrology
Type: Journal Article | Journal: Journal of nanoscience and nanotechnology | Year: 2012

We report on the fabrication of the nanoporous TiO2 hollow capsules using core-shell silica nanoparticle templates. The thickness of the capsules can be simply controlled by varying the amount of the TiO2 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 TiO2 hollow capsules was also investigated and compared to that of the commercial TiO2 nanoparticles.

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