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RISS 인기검색어
- 검색키워드
- 저자 : Andrey Baranov (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Spatially-resolved Study of the Luminescence from ZnO/MgO Core-shell Nanocrystal Structures
파닌,Andrey Baranov,Olesya Kapitanova,강태원 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.3
The luminescent properties of core-shell nanocrystal structures were investigated with high spatial resolution. The composites consisting of ZnO/MgO core/shell nanoheteroparticles showed an increase in the relative intensity of the green luminescence after annealing while a suppression of green luminescence from samples of ZnO tetrapods in a MgO nanoparticle matrix was observed. Combined spatially-resolved combined through-the-lens-detector (TLD) and cathodoluminescence (CL) measurements revealed that the depletion of electrons in the ZnO nanocrystals could lead to a suppression of the luminescence.
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Spatially-Resolved Study of Magnetic Properties of Mn-Doped ZnO Quantum Wires
Gennady Panin,Andrey Baranov,Hyun Jeong Kim,Seung Ki Min,강태원 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
ZnO nanowires prepared by thermal growth following direct chemical synthesis and doped by Mn and by Mn and Sn impurities were investigated. The nanowires show a single crystal structure and a strong blue shift of the near band edge luminescence, which is attributed to the quantum confinement effect. The magnetic susceptibility of the quantum wires as a function of temperature demonstrated a Curie-Weiss behavior. Hysteresis with a coercive field $<$200 Oe was clearly observed in the magnetization versus field curves at 300 K. Increasing the Mn concentration by Mn and Sn co-doping significantly increased the magnetic hysteresis and the ferromagnetic behavior of the nanowires. Magnetic force microscopy measurements with high spatial resolution revealed a magnetic domain structure in the individual wires. The magnetic domains align perpendicular to the surface and can be controlled by using an external magnetic field.
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Luminescent Properties of ZnO/MgO Nanocrystal/Polymer Composite Structure
Gennady N. Panin,Andrey N. Baranov,Irina A. Khotina,Tae W. Kang 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We report on cathodoluminescence (CL) studies of the composite nanostructure obtained by spin coating of a mixture of chemically-deposited ZnO/MgO nanocrystals and a solution processable polymer (PDPV) on a Si substrate with patterned gold electrodes. The effect of an electric field on the CL of the nanostructure was studied at various bias voltages on the electrodes. A positive voltage suppressed the blue-green emission and shifted the emission maximum to the red region. The emission maximum returned to the blue-green region after the eld had been turned off. A model of the electric-field-induced color switching in the ZnO/polymer-based nanostructure is proposed. The bias-voltage-induced interface band bending and the deactivation of the radiative centers, in particular, singly-ionized oxygen vacancies in ZnO nanocrystals, are suggested to govern the relative changes of the blue-green-red emissions. We report on cathodoluminescence (CL) studies of the composite nanostructure obtained by spin coating of a mixture of chemically-deposited ZnO/MgO nanocrystals and a solution processable polymer (PDPV) on a Si substrate with patterned gold electrodes. The effect of an electric field on the CL of the nanostructure was studied at various bias voltages on the electrodes. A positive voltage suppressed the blue-green emission and shifted the emission maximum to the red region. The emission maximum returned to the blue-green region after the eld had been turned off. A model of the electric-field-induced color switching in the ZnO/polymer-based nanostructure is proposed. The bias-voltage-induced interface band bending and the deactivation of the radiative centers, in particular, singly-ionized oxygen vacancies in ZnO nanocrystals, are suggested to govern the relative changes of the blue-green-red emissions.
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Kapitanova, Olesya O,Panin, Gennady N,Cho, Hak Dong,Baranov, Andrey N,Kang, Tae Won IOP 2017 Nanotechnology Vol.28 No.20
<P>Photocatalytic oxidation of graphene with ZnO nanoparticles was found to create self-assembled graphene oxide/graphene (G/GO) photosensitive heterostructures, which can be used as memristors. Oxygen groups released during photodecomposition of water molecules on the nanoparticles under ultraviolet light, oxidized graphene, locally forming the G/GO heterojunctions with ultra-high density. The G/GO nanostructures have non-linear current–voltage characteristics and switch the resistance in the dark and under white light, providing four resistive states at room temperature. Photocatalytic oxidation of graphene with ZnO nanoparticles is proposed as an effective method for creating two-dimensional memristors with a photoresistive switching for ultra-high capacity non-volatile memory.</P>
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