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Seo, Kwanyong,Bagkar, Nitin,Kim, Si-in,In, Juneho,Yoon, Hana,Jo, Younghun,Kim, Bongsoo American Chemical Society 2010 NANO LETTERS Vol.10 No.9
<P>We report fabrication of Heusler alloy Fe<SUB>3</SUB>Si nanowires by a diffusion-driven crystal structure transformation method from paramagnetic FeSi nanowires. Magnetic measurements of the Fe<SUB>3</SUB>Si nanowire ensemble show high-temperature ferromagnetic properties with <I>T</I><SUB>c</SUB> ≫ 370 K. This methodology is also successfully applied to Co<SUB>2</SUB>Si nanowires in order to obtain metal-rich nanowires (Co) as another evidence of the structural transformation process. Our newly developed nanowire crystal transformation method would be valuable as a general method to fabricate metal-rich silicide nanowires that are otherwise difficult to synthesize.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-9/nl102093e/production/images/medium/nl-2010-02093e_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl102093e'>ACS Electronic Supporting Info</A></P>
Yoon, Hana,Seo, Kwanyong,Bagkar, Nitin,In, Juneho,Park, Jeunghee,Kim, Jaemyung,Kim, Bongsoo WILEY‐VCH Verlag 2009 Advanced Materials Vol.21 No.48
<P><B>Vertically aligned single‐crystalline Co<SUB>5</SUB>Ge<SUB>7</SUB> nanowire (NW) and nanobelt arrays</B> are grown on a very thin graphite layer as well as a curved graphite layer with a good epitaxial lattice match. Co<SUB>5</SUB>Ge<SUB>7</SUB> NW arrays, thus grown, show very efficient field emission properties comparable to those of carbon nanotubes and may be used for flexible field emission displays in the future. </P>
Kang, T H,Bagkar, Nitin C,Jung, Y S,Chun, H H,Shin, S C,Cho, H,Kim, J K,Kim, T G American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.10
<P>In this study, we report the synthesis and characterization of novel hybrid nanocoating based on carbon nanotubes (CNTs) on anodized aluminum surfaces (AAO). The hybrid nanocoating was deposited by number of methods which include spray coating, spin coating and dip coating. The bonding of nanocoating with metal surface is an important parameter for successful modification of the metal surfaces. The improved adhesion of nanocoating on metal surfaces could be attributed to chemical bonding of sol-gel nanocoating with anodized surfaces. The nanocoated anodized aluminum surfaces showed superior adhesion and excellent anticorrosive properties. The nanocoated panels showed enhanced galvanic protection comparable to 80% of titanium metal as determined by galvanic corrosion measurements. It also showed higher thermal conductivities than stainless steel and bare anodized surfaces.</P>
Yoon, Hana,Lee, Alex Taekyung,Choi, Eun-Ae,Seo, Kwanyong,Bagkar, Nitin,Cho, Jaehun,Jo, Younghun,Chang, K. J.,Kim, Bongsoo American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.49
<P>Single-crystalline free-standing hexagonal Fe<SUB>1.3</SUB>Ge nanowires (NWs) are synthesized for the first time using a chemical vapor transport process without using any catalyst. Interestingly, Fe<SUB>1.3</SUB>Ge NWs are found to be ferromagnetic at room temperature, while bulk Fe<SUB>1.3</SUB>Ge has the lower critical temperature of 200 K. We perform first-principles density functional calculations and suggest that the observed strong ferromagnetism is attributed to the reduced distances between Fe atoms, increased number of Fe−Fe bonds, and the enhanced Fe magnetic moments. Both experimental and theoretical studies show that the magnetic moments are enhanced in the NWs, as compared to bulk Fe<SUB>1.3</SUB>Ge. We also modulate the composition ratio of as-grown iron germanide NWs by adjusting experimental conditions. It is shown that uniaxial strain on the hexagonal plane also enhances the ferromagnetic stability.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-49/ja104189p/production/images/medium/ja-2010-04189p_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja104189p'>ACS Electronic Supporting Info</A></P>