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( Maiduyhien ),유효종 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Hybrid materials with anisotropic noble-metal nanoparticle cores and cagelike transition-metal chalcogenide shells are considered promisng materials in a wide diversity of applications. Herein, a facile preparation of gold multipod nanoparticles (GMNs) embedded within cobalt sulfide nanocage is reported. The as-prepared GMN cores- ZIF-67 shell (GMN@ZIF-67) nanostructures can act as sacrificial templates to the desired nanohybrids composed of multiple GMNs and cobalt sulfide (GMN@CoxSy) nanocages. Electrocatalytic oxygen evolution reaction (OER) of the prepared nanocatalysts reveals that a type of GMN@CoxSy nanohybrid shows a substantially lower overpotential (η) value (345 mV) compared with those of GMNs (617 mV) and CoxSy nanomaterials (418 mV) at a current density of 10 mA cm2, mainly due the highly effective core-shell interfaces as well as the optimized cobalt sulfide shells of the nanohybrids.
( Maiduyhien ),유효종 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Uniform nanostructured nickel-based coordination polymer particles with multilayered morphologies (mL-NiCPPs) were successfully fabricated through a two-step heating process. To increase the surface area by reducing the size of mL-NiCPPs, pyridine and acetic acid were added as size modulators during the growth process. The resultant coordination polymer nanoparticles were then calcinated at a controlled temperature in order to produce nickel oxide nanostructures (mL-NiOs), which showed a relatively high BET specific surface area (112 m2/g) and a well-defined pore size (10 nm), hence exhibited significant potential for use in a variety of applications. The synthesized mL-NiOs were successfully deposited onto an indium tin oxide (ITO) serving as an efficient matrix for the immobilization of urease (Ur). The prepared bioelectrode showed a high sensitivity and a linear dependence of the current on the urea concentration.
Urease-immobilized aminated glassy carbon electrode and its application for urea detection
( Maiduyhien ),유효종 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The surface of glassy carbon electrode (GCE) was initially modified with amino groups using electrooxidation of ammonium carbamate at a potential exceeding 1.0 V vs Ag/AgCl. Interestingly, aminated GCE exhibits capability of electrooxidizing carbamic acid produced from urea during urease reaction. It is, however, always a great practical challenge of how to efficiently and stably immobilize urease on aminated GCE to improve electrode stability and lifetime. Herein, urease was immobilized onto aminated GCE using glutaraldehyde and aniline as cross-linking and co-polymerization agents, respectively. The prepared urease-based aminated GCE was employed for urea sensing using amperometric and cyclic voltammetric (CV) techniques. A high sensitivity and good linear relationship between urea concentration and current were observed on the prepared bioelectrode.
Synthesis of cobalt cluster-based supramolecular triple-stranded helicates
( Maiduyhien ),유효종 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
A cobalt cluster-based triple-stranded helicate,Co8(PDA)6(PTA)3(DMF)3 (H2O)3 (1) (PDA=2,6-pyridinedicarboxylate, PTA=benzene-1,3-dicarboxylate, DMF=dimethylformamide) was successfully synthesized and fully characterized. Complex 1 can be used as a supramolecular building block in constructing a higher-order helix-of-helix structure, [Co8 (PDA)6(PTA)3(DMF)2(H2O)4-0.51(Co(OHn)2)] (n = 1 or 2) (2).
( Maiduyhien ),( Le Thi Cam Van ),유효종 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Advanced hybrid nanomaterials tailored with unique morphologies and multiple functions can be fabricated by the rational combination of two or more well-designed components. The distinctively shaped metal cores with well-defined coordination polymer shells can lead to synergistic structural properties in the resultant hybrid materials. Herein, we report a facile synthetic strategy for gold multipod nanoparticle (GMN) core-zeolitic imidazolate framework (ZIF-67) shell (GMN@ZIF-67) nanohybrids. The synthetic process can be readily achieved without using surfactants or capping reagents. Thus, it is potentially an environmentally friendly route to expedient nanohybrids. The material properties (i.e., surface area, size, and shape) of the resultant GMN@ZIF-67 nanohybrids can be readily controlled by simply varying the relative amount of GMNs and ZIF-67 precursors used.
( Maiduyhien ),유효종 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Highly-ordered heteronanostructures can be synthesized by the overgrowth of a secondary material on the as-prepared seed nanocrystals. The unique morphology of seed nanocrystals directs the shape of the secondary structure, which is exploited to develop structurecontrolled composite nanomaterials. Herein, we report a facile and controllable synthetic strategy toward noble star-shaped bimetallic nanostructures. Gold multipod nanoparticle (GMN) core-platinum shell nanoparticles (GMN@Pt NPs) are successfully synthesized through the overgrowth of Pt on the surface of GMN seeds. Due to the structural uniqueness of GMNs, GMN@Pt NPs show bimetallic core-shell geometries, which have surface roughness and star-shaped multi-branches with sharp edges and tips. GMN@Pt NPs with optimized Pt shells show much higher catalytic activities in 4-nitrophenol reduction and ethanol electrooxidation than those of GMNs or Pt nanoparticles.
Rational Design of Functional Cobalt Triple-Stranded Helicates
( Maiduyhien ),이상돈,유효종 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Cobalt triple-stranded helicates (Co-TSHs) comprising two tetranuclear cobalt clusters interconnected by three isophthalate (PTA) ligands could be employed as primary modules for the construction of higherorder molecular platforms. Assemblies of the Co-TSH modules are, however, merely driven through oxygen sites residing on their cobalt clusters that somewhat restrict their assembly pathway. In this regard, introduction of desired functional moieties (e.g. amino, carboxylate, halogenate, etc.) at specific positions on Co-TSHs is essentially important since this establishes more possible connecting sites. In this presentation, the preparation of various targeted functional Co-TSHs via systematic variation of PTA-derived ligands will be demonstrated. Each unique functional Co-TSH is sequently subjected to higher level of coordination-driven assemblies, resulting in unique hierarchical molecular platforms, including cage and polymeric structures.