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RISS 인기검색어
- 검색키워드
- 저자 : Thuy T.D. Nguyen (검색결과 4 건)
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Nguyen, Thuy T.D.,Choi, Ha-Nui,Ahemad, M. Jamir,Van Dao, Dung,Lee, In-Hwan,Yu, Yeon-Tae Elsevier 2020 Journal of Alloys and Compounds Vol.820 No.-
<P><B>Abstract</B></P> <P>Indium oxide nanocubes (NCs) were prepared via a simple, template-free hydrothermal method at low temperature; the so-obtained structures exhibited large surface area (47.67 m<SUP>2</SUP>/g) and Barrett−Joyner−Halenda (BJH) adsorption average pore diameter (11.92 nm), both higher than for commercial In<SUB>2</SUB>O<SUB>3</SUB> nanoparticles. At the optimal temperature of 300 °C, the In<SUB>2</SUB>O<SUB>3</SUB> NCs-based sensor showed a superior response of 85–100 ppm ethanol, 3.4 times higher than that of the commercial one based on In<SUB>2</SUB>O<SUB>3</SUB> NPs, and also faster response time (15 s) than the commercial device (60 s). The better sensing performance of the synthesized In<SUB>2</SUB>O<SUB>3</SUB> NCs can be attributed to its unique properties that include large BET surface area and BJH adsorption average pore diameter as well as abundance of sharp edges and tips, which result in high surface to volume ratios for the gas adsorption and diffusion processes, facilitating the charge-transfer and sensing reactions at the gas–solid interfaces. In addition, the In<SUB>2</SUB>O<SUB>3</SUB> NCs exhibited excellent selectivity to ethanol among other target gases (CO, CH<SUB>4</SUB>, CH<SUB>3</SUB>CHO, H<SUB>2</SUB>, and CH<SUB>3</SUB>COCH<SUB>3</SUB>). This work provides an effective design pathway for ethanol sensors based on In<SUB>2</SUB>O<SUB>3</SUB> NCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In<SUB>2</SUB>O<SUB>3</SUB> nanocubes are prepared via a template-free method at low temperature. </LI> <LI> In<SUB>2</SUB>O<SUB>3</SUB> nanocubes show high surface area and large BJH adsorption pore diameter. </LI> <LI> In<SUB>2</SUB>O<SUB>3</SUB> nanocubes show high sensing response and good selectivity to ethanol gas. </LI> <LI> Our finding opens an effective pathway to develop ethanol sensors. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The graphical abstract for In<SUB>2</SUB>O<SUB>3</SUB> nanocubes ethanol gas sensing.</P> <P>[DISPLAY OMISSION]</P>
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Dung Van Dao,Thuy T.D. Nguyen,김동석,윤지욱,유연태,이인환 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
Developing efficient and stable hydrogen gas sensors may be of urgent demand for its safety uses. Herein,Pd@N-CeO2 core–shell nanoflatforms (CSNFs) are fabricated and utilized for this purpose. The resultingPd@N-CeO2 CSNFs offer small particle sizes with high Brunauer–Emmett–Teller (BET) surface area andporous nanostructures. The core–shell sensors establish high hydrogen sensing response and fastresponse and recovery times at a lower optimal working temperature compared to undoped and dopedCeO2 ones. In addition, it further demonstrates high selectivity and stability toward hydrogen gas amonginterfering different target gases. The hydrogen gas sensing betterment is synergistically assigned to Pdcore, N dopant, and high BET surface area effects, which decidedly modulate the electrical resistance ofcore–shell sensors to improve overall gas sensing performance accordingly. Ourfinding provides anefficient way to design and fabricate versatile hydrogen gas sensors based on metal@nitrogen dopedsemiconductoroxide core–shell nanostructures.
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Van Dao, Dung,Nguyen, Thuy T.D.,Song, Hyeon-Yong,Yang, Jin-Kyu,Kim, Tae-Won,Yu, Yeon-Tae,Lee, In-Hwan Elsevier 2018 Materials & Design Vol.159 No.-
<P><B>Abstract</B></P> <P>As a good stabilizer, [BMIM]BF<SUB>4</SUB> ionic liquid (IL) has been successfully utilized to assist preparation of Ag nanoparticles (NPs) decorated on CeO<SUB>2</SUB> supports. The obtained IL-stabilized Ag-CeO<SUB>2</SUB> nanocomposite showed better photocatalytic degradation activity (92%) of Auramine O (AO) dye as compared with pure CeO<SUB>2</SUB> (35%) NPs and IL-free Ag-CeO<SUB>2</SUB> (65%) nanocomposite after 90 min of visible light irradiation. The improvement could be attributable to small size (5 nm) of IL-stabilized Ag NPs loaded on the surface of CeO<SUB>2</SUB> supports and the large surface area of its nanocomposite (11.11 m<SUP>2</SUP>/g). These increase in the interfacial contact areas between IL-stabilized Ag NPs and CeO<SUB>2</SUB> supports that enhance the charge transfer and reduce the recombination of the photogenerated electron-hole pairs. Further, the IL-stabilized Ag-CeO<SUB>2</SUB> nanocomposite showed good photocatalytic stability for dye degradation. The persuasible mechanism of enhanced photocatalytic degradation of AO was clearly discussed on the basis of localized surface plasmon resonance (LSPR) effect of Ag NPs as well. Accordingly, this work can pave new pathway to prepare nanoparticles coated on metal oxide nanostructures for the practical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> [BMIM]BF<SUB>4</SUB> ionic liquid (IL) has been used to assist synthesis of small Ag NPs decorated on CeO<SUB>2</SUB> supports. </LI> <LI> IL-stabilized Ag-CeO<SUB>2</SUB> showed superior photocatalytic activity of 92 % for auramine O degradation under visible light. </LI> <LI> Enhanced photocatalytic activity was attributed to the localized surface plasmon resonance of small IL-stabilized Ag NPs. </LI> <LI> IL-stabilized Ag-CeO<SUB>2</SUB> nanocomposite was effective for the treatment of waste water containing organic dyes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Study of Nanostructured Polymeric Composites and Hybrid Layers Used for Light-Emitting Diodes
N. N. Dinh,L. H. Chi,T. T. C. Thuy,D. V. Thanh,T. P. Nguyen 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Nanocomposite polymeric thin lms of poly(2-methoxy-5-(2'-ethyl hexyloxy)phenylene vinylene) (MEH-PPV) with nano-crystalline titanium oxide (nc-TiO2) and polycarbazole (PVK) with cadmium selenide (CdSe) were fabricated by spin-coating. A 20-nm-thick nanocrystalline (molyb-denum oxide) MoO3 layer prepared by using thermal oxidation was also spin-coated with a PVK film. A study of photoluminescence (PL) spectra of the polymers and nanocomposites showed an enhancement in the photoluminescence from the nanocomposites. Moreover, MEH-PPV+nc-TiO2 composites exhibited a blue-shift of the PL spectrum as compared to that of the polymer film. The current-voltage characteristics of the Mo/nc-MoO3/PVK/Al-Au structures show that a semitransparent metallic coating or a transparent polymer can serve as a cathode in devices with enhanced charge carrier injection.
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