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- 저자 : TRANVANTAN (검색결과 6 건)
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Silver-enhanced conductivity of magnetoplasmonic nanochains
TRANVANTAN,Hongjian Zhou,박중연,김종만,이재범 한국물리학회 2015 Current Applied Physics Vol.15 No.2
A method for improving the electrical properties of one-dimensional conducting structures by reductive deposition of metallic silver on a gold surface is presented. Fe3O4@Au coreeshell nanoparticles were used to fabricate conducting magnetoplasmonic nanochains (MPNCs) through magnetic-field-induced assembly. The MPNCs were prepared on a solid substrate. Their dimension was controlled by adjusting the pH of the colloidal solution. The nanochains (NCs) were placed across gold microelectrodes, and additional metal was deposited by highly specific chemical enhancement of the colloidal gold using a silver enhancement solution. Silver-enhanced MPNCs show a remarkable morphology and an impressive enhancement in electrical properties compared to the as-prepared MPNCs.
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Thermal behavior of surface plasmon resonance in dynamic suprastructure multilayer
TRANVANTAN,Hongjian Zhou,Seongcheol Hong,Jung Youn Park,Hongxia Chen,고광락,이재범 한국물리학회 2013 Current Applied Physics Vol.13 No.5
Delicate thermodynamic control at confined space has been of importance in recent nano/microplasmonic sensing to be more accurate and to use lower quantity of specimens than conventional devices. In our study, experimental and computational study on thermal behavior of surface plasmon resonance (SPR) was carried out using various sizes of Au nanoparticles (NPs; 4, 18, and 57 nm) and thermo-reversible polymer, poly(N-isopropylacrylamide) (PNIPAm) on SPR chip. It was interesting that SPR angle shift on temperature was dependent on NP sizes, where the smaller size the better sensitive. It is probable that both plasmonic interaction and polymer dynamicity were collaboratively affected and presumably the latter dominated in the thermal monitoring of SPR signals. The simulations clearly indicated that the interaction between the Au NPs and polymers was strengthened by increasing temperature and NP sizes, resulting in decreasing sensitivity. These results are supportive to develop further accurate devices using plasmonics and polymer dynamics, such as plasmonic sensing devices, thermoactuators,hybrid organic solar cell, and flexible display.
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Optical Anisotropicity of Core-Shell or Yolk-Shell-typed Ag@Fe3O4 Nanochains
TRANVANTAN,김정효,김종혁,이동규,정기재,이재범 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.11
Optical anisotropicity of 1-dimensional nanochains of yolk-shell (YOSH) and core-shell (COSH) Ag@Fe3O4 nanoparticles (NPs) is attractive to comprehend electromagnetic relation in different materials in nanoscale regime. To investigate its unique properties, a YOSH Ag@Fe3O4 nanoscale superstructure is prepared through a successive process using COSH-NPs via a selective etching approach. The Ag-core can be etched when exposed to a mixture of polyvinylpyrrolidone (PVP) and hydrogen peroxide (H2O2) solution at 25°C. It is investigated that the etching degree of Ag-core in the COSH-NPs is linearly correlated with the average molecular weight and amount of PVP and H2O2. In the optical investigation, one-dimensional YOSH and COSH nanochains are compared to show the dependence of anisotropic plasmonic response on tuning polarized light angle. The YOSH nanochain shows an insensitive plasmonic shift in respect of varying refractive index of solvent, which is probably related with the void of Ag-yolk and Fe3O4 shell. It is probable that the unique properties of the COSH and YOSH nanochain can be applied to be a potential photonic device and their ultralow quantity sensing and imaging.
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Tran, Van Tan,Kim, Jeonghyo,Tufa, Lemma Teshome,Oh, Sangjin,Kwon, Junyoung,Lee, Jaebeom American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.1
<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2018/ancham.2018.90.issue-1/acs.analchem.7b04255/production/images/medium/ac-2017-04255v_0009.gif'></P>
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Magnetic-Assembly Mechanism of Superparamagneto-Plasmonic Nanoparticles on a Charged Surface
Tran, Van Tan,Zhou, Hongjian,Lee, Seunghun,Hong, Seong Cheol,Kim, Jeonghyo,Jeong, Se-Young,Lee, Jaebeom American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.16
<P>One-dimensional magnetoplasmonic nanochains (MPNCs) were self-assembled using Au-coated Fe<SUB>3</SUB>O<SUB>4</SUB> core–shell superparamagnetic nanoparticles (Fe<SUB>3</SUB>O<SUB>4</SUB>@Au NPs) by applying an external static magnetic field. The assembly mechanism of the Fe<SUB>3</SUB>O<SUB>4</SUB>@Au NPs was investigated thoroughly, revealing that substrate–particle interactions, van der Waals forces, and magnetic forces play important roles in the formation and control of the MPNCs. Magnetic force microscopy (MFM) and vibrating sample magnetometry (VSM) were used to study the magnetic properties of the MPNCs, which were compared with those of Fe<SUB>3</SUB>O<SUB>4</SUB> nanochains.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-16/acsami.5b00904/production/images/medium/am-2015-00904e_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b00904'>ACS Electronic Supporting Info</A></P>
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Highly stable functionalized aluminum nanoparticles for magneto-energetic composite fabrication
Tran, Van Tan,Kim, Ji Hoon,Jeong, Ki-Jae,Kwon, Junyoung,Kim, Soo Hyung,Lee, Jaebeom Elsevier Science Inc 2018 Combustion and Flame Vol.187 No.-
<P><B>Abstract</B></P> <P>An effective coating strategy is employed to functionalize and protect the surfaces of aluminum (Al) nanoparticle (NPs) from oxidation and aggregation using silanization of the oxide surface with (3-aminopropyl) triethoxysilane (Al@APTES), followed by an amine/carboxylic exchange using glutaric anhydride (Al@APTES@GA). The stability of the two types of functionalized Al NPs in aqueous solution is studied using dynamic light scattering and x-ray diffraction phase/composition identification. It is found that Al@APTES NPs transform into bayerite (β-Al(OH)<SUB>3</SUB>) after storage for a short period of time, while Al@APTES@GA NPs exhibit long-term stability. Hydration of Al results in micro-sized aggregates and a large proportion of dead weight, which reduces the particles’ energetic properties. Al–Fe<SUB>3</SUB>O<SUB>4</SUB> magnetic–energetic (Magnerg) composites are fabricated via the electrostatic interaction of oppositely charged NPs in an aqueous solution. The high dispersity and stability of Al@APTES@GA NPs assure their intimate arrangement with oxidizing Fe<SUB>3</SUB>O<SUB>4</SUB> NPs that facilitates mass transport between reactants.</P>
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