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1.
Blockcopolymer (BCP) lithography is an emerging nanolithography technique for fabrications of various nanoscale devices and materials. In this study, self-assembled BCP thin films having cylindrical nanoholes were prepared on gold by surface neutralization using self-assembled monolayer (SAM). Oxygen plasma treatment was investigated as a way to enhance the functionality of Au surface toward SAM formation. After surface neutralization, well-ordered nanoholes with 9 to 20 nm diameters were formed inside BCP thin films on Au surfaces through microphase separation. The effects of oxygen plasma treatment on the formation of BCP nanopattern were investigated using surface analysis techniques including X-ray photoelectron spectroscopy (XPS) and water contact angle measurement. Au nanodot arrays were fabricated on gold film by utilizing the BCP nanotemplate and investigated by atomic force microscopy (AFM). 相似文献
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Jusang Park Han-Bo-Ram Lee Doyoung Kim Jaehong Yoon Clement Lansalot Julien Gatineau Henri Chevrel Hyungjun Kim 《Journal of Energy Chemistry》2013,22(3):403-407
Cobalt (Co) thermal or plasma enhanced atomic layer deposition (PE-ALD) was investigated using a novel metal organic precursor, Co(MeCp)2, and NH3 or H2 or their plasma as a reactant. The growth characteristics, electrical and microstructural properties were investigated. Especially, PE-ALD produced Co thin films at low growth temperature down to 100 °C. Interestingly, the low temperature growth of Co films showed the formation of columnar structure at substrate temperature below 300 °C. The growth characteristics and films properties of PE-ALD Co using bis(η-methylcyclopentadienyl) Co(II) (Co(MeCp)2) was compared with those of PE-ALD Co using other Cp based metal organic precursors, bis-cyclopentadienyl cobalt (II) (CoCp2) and cyclopentadienyl isopropyl acetamidinato-cobalt (Co(CpAMD)). 相似文献
3.
Dielectric layer containing CoSi2 nanocrystals was directly fabricated by plasma-enhanced atomic layer deposition using CoCp2 and NH3 plasma mixed with SiH4 without annealing process. Synchrotron radiation X-ray diffraction and X-ray photoelectron spectroscopy results confirmed the formation of CoSi2 nanocrystal. The gate stack composed of dielectric layer containing CoSi2 nanocrystals with ALD HfO2 capping layer together with Ru metal gate was analyzed by capacitance–voltage (C–V) measurement. Large hysteresis of C–V curves indicated charge trap effects of CoSi2 nanocrystals. The current process provides simple route for the fabrication of nanocrystal memory compatible with the current Si device unit processes. 相似文献
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A Conductive Hybridization Matrix of RuO2 Two‐Dimensional Nanosheets: A Hybrid‐Type Photocatalyst 下载免费PDF全文
Jang Mee Lee Eun Kyung Mok Seul Lee Dr. Nam‐Suk Lee Dr. Lamjed Debbichi Prof. Hyungjun Kim Prof. Seong‐Ju Hwang 《Angewandte Chemie (International ed. in English)》2016,55(30):8546-8550
A universal methodology to efficiently improve the photocatalyst performance of semiconductors was developed by employing exfoliated RuO2 two‐dimensional nanosheets as a conducting hybridization matrix. The hybridization with a RuO2 nanosheet is easily achieved by crystal growth or electrostatically derived anchoring of semiconductor nanocrystals on the RuO2 nanosheet. An enhanced chemical interaction of inorganic semiconductor with hydrophilic RuO2 nanosheet is fairly effective in optimizing their photocatalytic activity and photostability by the enhancement of charge separation and charge mobility. The RuO2‐containing nanohybrids show much better photocatalyst functionalities than do the graphene‐containing ones. The present study clearly demonstrates that hydrophilic RuO2 nanosheets are superior hybridization matrices, over the widely used hydrophobic graphene nanosheets, for exploring new efficient hybrid‐type photocatalysts. 相似文献
6.
Mangesh S. Diware Kyunam Park Jihun Mun Han Gyeol Park Won Chegal Yong Jai Cho Hyun Mo Cho Jusang Park Hyungjun Kim Sang-Woo Kang Young Dong Kim 《Current Applied Physics》2017,17(10):1329-1334
Here, we present the spectroscopic ellipsometry investigation of synthetically grown wafer-scale two-dimensional (2D) MoS2 and WSe2 films to access quality and thickness uniformity. MoS2 and WSe2 samples were grown by chemical vapor deposition and atomic layer deposition, respectively. Complex dielectric function () and thickness information of these 2D films were extracted from the measured data using multilayer optical calculations. Broad spectral range (1.2–6 eV) and multiple angles of incidence were used to reduce correlations among fitting parameter. Lineshape of ε of MoS2 and WSe2 monolayer films are consistent with literature but shows higher values, suggests better quality of our samples. Eight-inch wafer size MoS2 monolayer sample shows ~ 70% uniformity with an average thickness of 0.65 ± 0.2 nm, and three-layer WSe2 sample of 8 × 1 cm2 area shows ~ 80% uniformity with an average thickness of 2.5 ± 0.4 nm. Our results will be helpful to accelerate commercialization process of 2D devices. 相似文献
7.
High‐performance alternating current electroluminescent layers solution blended with mechanically and electrically robust nonradiating polymers 下载免费PDF全文
8.
Ge self-assembled quantum dots (SAQDs) grown on a relaxed Si0.75Ge0.25 buffer layer were observed using an atomic force microscopy (AFM) and a transmission electron microscopy (TEM). The effect of buried misfit dislocations on the formation and the distribution of Ge SAQDs was extensively investigated. The Burgers vector determination of each buried dislocation using the g·b = 0 invisibility criterion with plane-view TEM micrographs shows that Ge SAQDs grow at specific positions related to the Burgers vectors of buried dislocations. The measurement of the lateral distance between a SAQD and the corresponding misfit dislocation with plane-view and cross-sectional TEM images reveals that SAQDs form at the intersections of the top surface with the slip planes of misfit dislocations. The stress field on the top surface due to misfit dislocations is computed, and it is found that the strain energy of the misfit dislocations provides the preferential formation sites for Ge SAQDs nucleation. 相似文献
9.
Jusang Park Han-Bo-Ram Lee Doyoung Kim Jaehong Yoon Clement Lansalot Julien Gatineau Henri Chevrel Hyungjun Kim 《天然气化学杂志》2013,(3):403-407
Cobalt(Co) thermal or plasma enhanced atomic layer deposition(PE-ALD) was investigated using a novel metal organic precursor,Co(MeCp)2, and NH3 or H2 or their plasma as a reactant.The growth characteristics,electrical and microstructural properties were investigated.Especially, PE-ALD produced Co thin films at low growth temperature down to 100℃.Interestingly,the low temperature growth of Co films showed the formation of columnar structure at substrate temperature below 300℃.The growth characteristics and films properties of PE-ALD Co using bis(η-methylcyclopentadienyl) Co(Ⅱ)(Co(MeCp)2) was compared with those of PE-ALD Co using other Cp based metal organic precursors, bis-cyclopentadienyl cobalt(II)(CoCP2) and cyclopentadienyl isopropyl acetarrudinato-cobalt(Co(CpAMD)). 相似文献
10.
Kim H Goddard WA Han KH Kim C Lee EK Talkner P Hänggi P 《The Journal of chemical physics》2011,134(11):114502
We derive an analytical expression of the second virial coefficient of d-dimensional hard sphere fluids confined to slit pores by applying Speedy and Reiss' interpretation of cavity space. We confirm that this coefficient is identical to the one obtained from the Mayer cluster expansion up to second order with respect to fugacity. The key step of both approaches is to evaluate either the surface area or the volume of the d-dimensional exclusion sphere confined to a slit pore. We, further, present an analytical form of thermodynamic functions such as entropy and pressure tensor as a function of the size of the slit pore. Molecular dynamics simulations are performed for d = 2 and d = 3, and the results are compared with analytically obtained equations of state. They agree satisfactorily in the low density regime, and, for given density, the agreement of the results becomes excellent as the width of the slit pore gets smaller, because the higher order virial coefficients become unimportant. 相似文献