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RISS 인기검색어
- 검색키워드
- 저자 : Mau Chien Dang (검색결과 4 건)
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Le Thi Mai Hoa,Dang Mau Chien,Kozo Ishizaki 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.6
The amorphous Fe73.5 Cu₁Nb₃Si₁₃.5B9 alloy was prepared by using a rapid solidification technique. The rapidly quenched alloy was annealed in various temperatures for 60 minutes. This annealing process made a series of partially crystallized samples with different crystallization fractions. The formation of the nanoparticles was observed by using transmission electron microscopy (TEM). The phases and the compositions were identifed by using X-ray diffraction (XRD). The microstructure of the annealed samples was composed of nanocrystalline Fe$_3$Si grains surrounded by a residual amorphous phase. The crystallization fraction of the samples was determined by using two methods: cryogenic heat capacity (CHC) and differential scanning calorimetry (DSC) measurements. The first method is a new method and allowed small changes in the amount of the crystalline phase to be determined. There was a difference of about 3 \% between the CHC and the DSC values. The amorphous Fe73.5 Cu₁Nb₃Si₁₃.5B9 alloy was prepared by using a rapid solidification technique. The rapidly quenched alloy was annealed in various temperatures for 60 minutes. This annealing process made a series of partially crystallized samples with different crystallization fractions. The formation of the nanoparticles was observed by using transmission electron microscopy (TEM). The phases and the compositions were identifed by using X-ray diffraction (XRD). The microstructure of the annealed samples was composed of nanocrystalline Fe$_3$Si grains surrounded by a residual amorphous phase. The crystallization fraction of the samples was determined by using two methods: cryogenic heat capacity (CHC) and differential scanning calorimetry (DSC) measurements. The first method is a new method and allowed small changes in the amount of the crystalline phase to be determined. There was a difference of about 3 \% between the CHC and the DSC values.
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Localized Growth and Integration of Carbon Nanotubes on Micro-Hotplates
Doan Duc Chanh Tin,Dang Mau Chien,Danick Briand,Gregor Schurmann,Nicolaas F. de Rooij 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
This paper reports on the localized growth and integration of carbon nanotubes (CNTs) on micro-hotplates used as gas sensors. CNTs were grown directly on micro-hotplates coated with an optimized thickness of Ni catalyst by using the heat provided by the integrated micro-heater. The in uence of process parameters, such as the methane ow, the temperature and the growth time, was investigated to optimize the integration of the CNTs. We are developing Pt electrodes with a reduced gap by using e-beam lithography and investigating the application of an electric eld between these electrodes during CNTs growth to improve their electrical connection by orientating the direction of their growth to be perpendicular to the electrodes. This paper reports on the localized growth and integration of carbon nanotubes (CNTs) on micro-hotplates used as gas sensors. CNTs were grown directly on micro-hotplates coated with an optimized thickness of Ni catalyst by using the heat provided by the integrated micro-heater. The in uence of process parameters, such as the methane ow, the temperature and the growth time, was investigated to optimize the integration of the CNTs. We are developing Pt electrodes with a reduced gap by using e-beam lithography and investigating the application of an electric eld between these electrodes during CNTs growth to improve their electrical connection by orientating the direction of their growth to be perpendicular to the electrodes.
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INVESTIGATION OF SHAPE CONTROLLED SILVER NANOPLATES BY A SIMPLE CHEMICAL REDUCTION METHOD
ERIC FRIBOURG-BLANC,DUNG THI MY DANG,TUYET THI THU LE,CHINH DUNG TRINH,THANH THI NU THANH,CHIEN MAU DANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.3
This paper discusses the function of hydrogen peroxide and trisodium citrate (TSC) in the synthesis of silver (Ag) nanoplates through a simple chemical reduction method in ambient conditions. By this method, high purity Ag nanoplates were successfully generated (up to 100%). It was found that the amounts of hydrogen peroxide and TSC added to the solution are key to controlling the shape of Ag nanoparticles from spherical nanoparticles to hexagonal nanoplates and triangular nanoplates, depending on the Ag-to-hydrogen peroxide ratio and the Ag-to-TSC ratio used. This unique shape evolution process was carefully followed by a combination of ultraviolet-visible (UV-Vis) spectroscopy and transmission electron microscopy (TEM). The mean edge length of the triangular nanoplates varies from 65 nm to 100 nm. Polyvinyl pyrrolidone (PVP) is shown to increase the in-plane dimensions of the nanoplates as its relative concentration to Ag increases.
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Unipolar Resistance Switching Characteristics in a Thick ZnO/Cu/ZnO Multilayer Structure
Tran Le,Hoang Cao Son Tran,Van Hieu Le,Tuan Tran,Cao Vinh Tran,Thanh Tan Vo,Mau Chien Dang,김상섭,이재찬,Bach Thang Phan 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.7
The resistance switching mechanism and the electrical conduction of thick Cu/ZnO/Cu/ZnO/Cu structures were investigated for various ZnO thicknesses (40, 80, 160, and 320 nm) when the thickness of the middle Cu layer was 2 nm. The ZnO films had a microstructure with columnar grains normal to the substrate. The switching voltages (VSET and VRESET) varied with the thickness of the ZnO layer. A symmetric electrode structure exhibited a unipolar resistance switching. The electrical transport of both high-resistance state (HRS) and low-resistance state (LRS) was Ohmic conduction, and the resistance switching mechanism was driven by the formation and the rupture of Cu conducting paths.
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