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Yuanzhe Piao,유태경,Hoonsub Kim,Yejung Choi,Chaedong Lee,Eunjin Choi,Dasom Kim 나노기술연구협의회 2019 Nano Convergence Vol.6 No.34
We report a visual detection of Cr(VI) ions using silver-coated gold nanorods (AuNR@Ag) as sensing probes. Au NRs were prepared by a seed-mediated growth process and AuNR@Ag nanostructures were synthesized by growing Ag nanoshells on Au NRs. Successful coating of Ag nanoshells on the surface of Au NRs was demonstrated with TEM, EDS, and UV–vis spectrometer. By increasing the overall amount of the deposited Ag on Au NRs, the localized surface plasmon resonance (LSPR) band was significantly blue-shifted, which allowed tuning across the visible spectrum. The sensing mechanism relies on the redox reaction between Cr(VI) ions and Ag nanoshells on Au NRs. As the concentration of Cr(VI) ions increased, more significant red-shift of the longitudinal peak and intensity decrease of the transverse peak could be observed using UV–vis spectrometer. Several parameters such as concentration of CTAB, thickness of the Ag nanoshells and pH of the sample were carefully optimized to determine Cr(VI) ions. Under optimized condition, this method showed a low detection limit of 0.4 μM and high selectivity towards Cr(VI) over other metal ions, and the detection range of Cr(VI) was tuned by controlling thickness of the Ag nanoshells. From multiple evaluations in real sample, it is clear that this method is a promising Cr(VI) ion colorimetric sensor with rapid, sensitive, and selective sensing ability.
Piao, Yuanzhe,An, Kwangjin,Kim, Jaeyun,Yu, Taekyung,Hyeon, Taeghwan Royal Society of Chemistry 2006 Journal of materials chemistry Vol.16 No.29
<P>Novel sea urchin shaped nanostructured carbon spheres (carbon nano-urchins) were fabricated by the growth of carbon nanotubes on the surface of hollow carbon spheres. The carbon nano-urchins were successfully used as a catalyst support for methanol electrochemical oxidation.</P> <P>Graphic Abstract</P><P>Novel sea urchin shaped nanostructured carbon spheres (carbon nano-urchins) were fabricated by the growth of carbon nanotubes on the surface of hollow carbon spheres. The carbon nano-urchins were successfully used as a catalyst support for methanol electrochemical oxidation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b601684g'> </P>
Piao, Yuanzhe The Korean Electrochemical Society 2012 Journal of electrochemical science and technology Vol.3 No.1
Highly ordered and perforated anodic aluminum oxide membranes were prepared by anodic oxidation and subsequent removal of the barrier layer. By using these homemade anodic aluminum oxide membranes as templates, metal selenide nanowires and nanotubes were synthesized. The structure and composition of these one-dimensional nanomaterials were studied by field emission scanning electron microscopy as well as transmission electron microscopy and energy dispersive X-ray spectroscopy. The growth process of metal selenide inside anodic aluminum oxide channel was traced by investigating the series of samples using scanning electron microscopy after reacting for different times. Straight and dense copper selenide and silver selenide nanowires with a uniform diameter were successfully prepared. In case of nickel selenide, nanotubes were preferentially formed. Phase and crystallinity of the nanostructured materials were also investigated.
Facile Aqueous-Phase Synthesis of Uniform Palladium Nanoparticles of Various Shapes and Sizes
Piao, Yuanzhe,Jang, Youngjin,Shokouhimehr, Mohammadreza,Lee, In Su,Hyeon, Taeghwan WILEY-VCH Verlag 2007 Small Vol.3 No.2
<B>Graphic Abstract</B> <P>Uniform palladium nanoparticles of various sizes and shapes are synthesized via a simple aqueous-phase reaction between Pd<SUP>2+</SUP> ions and PEO<SUB>x</SUB>–PPO<SUB>y</SUB>–PEO<SUB>x</SUB> triblock copolymers; the size and shape are controlled by varying reaction conditions such as the pH value (see image). The palladium nanoparticles showed high catalytic activities for Suzuki cross-coupling reactions. <img src='wiley_img/16136810-2007-3-2-SMLL200600402-content.gif' alt='wiley_img/16136810-2007-3-2-SMLL200600402-content'> </P>
Piao, Yuanzhe,Kim, Jaeyun,Na, Hyon Bin,Kim, Dokyoon,Baek, Ji Seon,Ko, Mi Kyeong,Lee, Jung Hee,Shokouhimehr, Mohammadreza,Hyeon, Taeghwan Nature Publishing Group 2008 NATURE MATERIALS Vol.7 No.3
The thermal treatment of nanostructured materials to improve their properties generally results in undesirable aggregation and sintering. Here, we report on a novel wrap–bake–peel process, which involves silica coating, heat treatment and finally the removal of the silica layer, to transform the phases and structures of nanostructured materials while preserving their nanostructural characteristics. We demonstrate, as a proof-of-concept, the fabrication of water-dispersible and biocompatible hollow iron oxide nanocapsules by applying this wrap–bake–peel process to spindle-shaped akagenite (β-FeOOH) nanoparticles. Depending on the heat treatment conditions, hollow nanocapsules of either haematite or magnetite were produced. The synthesized water-dispersible magnetite nanocapsules were successfully used not only as a drug-delivery vehicle, but also as a T2 magnetic resonance imaging contrast agent. The current process is generally applicable, and was used to transform heterostructured FePt nanoparticles to high-temperature face-centred-tetragonal-phase FePt alloy nanocrystals.
Piao, Yuanzhe,Kim, Hasuck American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.4
<P>Ordered porous anodic aluminum oxide templates have been used extensively for the preparation of various functional nanostructures. Researches on these nanostructured materials for various purposes have received a tremendous attention during recent years. A review of the literature on the fabrication of nanostructured materials using ordered porous anodic aluminum oxide templates and their applications is presented. A survey of the preparation of anodic aluminum oxide films is given first, with an emphasis on highly ordered anodic aluminum oxide films, as the ordered structure is the key point to prepare nanomaterials with uniform morphology. Methods for the fabrication of nanostructured materials using ordered porous anodic aluminum oxide templates are presented next: including dip filling, ion-encountering reaction, electroplating, and chemical vapor deposition method. Several typical examples of each preparation method are given. Finally, overview of applications on these nanostructured materials is presented, particular emphasis is focused on the field of sensing and electrocatalysis.</P>
Piao, Yuanzhe,Kim, Hyun Sik,Sung, Yung-Eun,Hyeon, Taeghwan Royal Society of Chemistry 2010 Chemical communications Vol.46 No.1
<P>A simple and scalable process was developed for the synthesis of highly crystalline magnetite nanocrystals embedded in a carbon matrix using low cost starting materials; the resulting nanocomposite showed a very high specific capacity of 863 mA hg<SUP>−1</SUP> in the initial cycle and high capacity retention of 90% after 30 cycles.</P> <P>Graphic Abstract</P><P>A simple and scalable process was developed for the synthesis of highly crystalline magnetite nanocrystals embedded in a carbon matrix; the resulting nanocomposite showed a very high specific capacity of 863 mA hg<SUP>−1</SUP> in the initial cycle and high capacity retention of 90% after 30 cycles. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b920037a'> </P>