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RISS 인기검색어
- 검색키워드
- 저자 : Hur Seung Huyn (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Ngo, Yen-Linh Thi,Hur, Seung Huyn Elsevier 2016 Materials research bulletin Vol.84 No.-
<P><B>Abstract</B></P> <P>The fabrication of highly sensitive gas sensors that can monitor environmental toxic gases, such as nitrogen dioxide (NO<SUB>2</SUB>), which is one the most harmful gases to human health, attracts considerable attention. In this study, a hybrid structure composed of reduced graphene oxide (rGO) and a p-type NiO hierarchical structure (NiO-rGO) is fabricated using a facile solution process. The morphology and surface properties are analyzed by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The NO<SUB>2</SUB> sensitivity is enhanced by the high surface to volume ratio of the NiO hierarchical structures as well as the enhanced charge transfer of NiO to rGO. The fabricated sensor with a hierarchical NiO and rGO hybrid structure exhibiting high sensitivity and selectivity at a low temperature (100°C) with a rapid response time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low temperature operable and highly sensitive gas sensors were fabricated. </LI> <LI> The rGO plays important roles in effective charge transfer from NiO. </LI> <LI> The well-developed NiO flower structures on the rGO surface enhanced the sensitity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Ngo, Yen-Linh Thi,Hoa, Le Thuy,Chung, Jin Suk,Hur, Seung Huyn ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.712 No.-
<P><B>Abstract</B></P> <P>A highly sensitive non-enzymatic glucose sensor was fabricated by hybridizing 0- dimensional (0D) Ag nanoparticles, 3D flower-like nickel oxide (NiO) nanostructures, and 2D reduced graphene oxide (rGO) as the sensing interface by hydrothermal synthesis. The resulting hybrid structures were characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy. The Ag/NiO/rGO fabricated in this study showed high electrochemical activity towards the oxidation of glucose in a 0.1 M NaOH solution. At an applied potential of +0.6 V, it exhibited a rapid response time (<4 s), a broad linear range of glucose concentrations up 25 mM with an extraordinarily high sensitivity of 1869.4 μA mM<SUP>−1</SUP> cm<SUP>−2</SUP>. The detection limit was as low as 2.44 μM. In addition, the response towards common interfering species, such as sucrose, lactose, fructose, ascorbic acid, dopamine, and uric acid were low enough to be avoidable.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Non-enzymatic glucose sensors were fabricated by hybridizing multi-dimensional Ag/NiO/rGO. </LI> <LI> Excellent electrocatalytic activity of the Ag/NiO/rGO toward glucose oxidation was achieved. </LI> <LI> The well-dispersed Ag/NiOs on the rGO surface enhanced the charge transfer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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