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Sun, Yu,Yoo, Bongyoung The Royal Society of Chemistry 2015 NEW JOURNAL OF CHEMISTRY Vol.39 No.6
<P>In this study, we investigated the length-controlled synthesis of one-dimensional (1D) metalloporphyrin coordination polymer particles (CPPs) through a bottom-up strategy assisted by an anion surfactant. We achieved the formation of 1D nanorod and nanowire structures, which showed efficient photocatalytic ability towards methylene blue (MB) decomposition under visible light illumination.</P> <P>Graphic Abstract</P><P>We investigated the length-controlled synthesis of 1D metalloporphyrin coordination polymer particles and achieved the formation of nanorod and nanowire structures, which showed good photocatalytic ability towards methylene blue decomposition. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5nj00403a'> </P>
Seo, Sungho,Yoo, Bongyoung American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.11
<P>As the aspect ratio of via-holes is increased, the difficulty in forming a conformal seed layer with sputtered Cu also increases, especially at the side-walls of the holes. Electroless deposition is a cost-effective, non-vacuum process; however, it requires the noble metal, Pd, during the activation process. In this study, we investigated the deposition of a continuous Cu lining in via-holes with an aspect ratio of 11 (5 mu m-width and 55 mu m-depth) using electrolessly deposited Ru as an activator instead of Pd on a Ta diffusion barrier layer. The electroless Ru deposition was successfully developed without an activation process. This was accomplished by increasing the hydrophilicity of the surface of the Ta barrier layer. The formed Ru layer can be utilized for the diffusion barrier as well as the activator. The bilayer barrier (Ru/Ta) may enhance the total diffusion barrier properties, allowing a reduction in the thickness of the Ta barrier layer while maintaining the same properties.</P>
Xiao, Feng,Yoo, Bongyoung,Lee, Kyu-Hwan,Myung, Nosang V IOP Pub 2007 Nanotechnology Vol.18 No.33
<P>A wide range of (Bi<SUB>1−<I>x</I></SUB>Sb<SUB><I>x</I></SUB>)<SUB>2</SUB>Te<SUB>3</SUB> thin films and nanowires were electrodeposited from acidic tartaric–nitric baths. Initially, (Bi<SUB>1−<I>x</I></SUB>Sb<SUB><I>x</I></SUB>)<SUB>2</SUB>Te<SUB>3</SUB> thin films were electrodeposited on gold substrates to investigate the effect of the deposition potential and electrolyte composition on film composition. After these investigations, (Bi<SUB>1−<I>x</I></SUB>Sb<SUB><I>x</I></SUB>)<SUB>2</SUB>Te<SUB>3</SUB> nanowires were potentiostatically electrodeposited using polycarbonate templates as scaffolds. The deposition conditions strongly influenced the deposit composition, crystal structures, and electrical properties of the nanowires. The preferential crystal orientation of the nanowires shifted from a {110} orientation at −20 mV to a {015} orientation at −100 mV. The temperature dependent <I>I–V</I> characteristics of bundle nanowires indicated that the nanowires were semiconductors with negative temperature coefficient of resistivity. The thermal activation energies were 0.20 eV for Bi<SUB>1.8</SUB>Sb<SUB>0.1</SUB>Te<SUB>3.1</SUB> and 0.49 eV for (Bi<SUB>0.3</SUB>Sb<SUB>0.7</SUB>)<SUB>2</SUB>Te<SUB>3</SUB> nanowires, respectively.</P>
Effect of Electrodeposition Condition on GMR Co/Cu Multilayers
Youngwoo Rheem,Bongyoung Yoo 한국자기학회 2007 Journal of Magnetics Vol.12 No.3
Co/Cu GMR multilayers were electrodeposited from various electrolytes using the dual bath technique to achieve high sensitive GMR multilayers. GMR ratio and sensitivity were strongly influenced by solution compositions and electrodeposition parameters where GMR and sensitivity of 12% and 0.052%/Oe were achieved from pyrophosphate baths. The effect of plating conditions on properties of Co/Cu multilayers may be attributed to crystallinity and grain size of deposits, and the ability of plating solutions to deposit contiguous films at lower nano thicknesses.