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Yanyan Ren,Le Yang,LIUDING WANG,Hui Xing,HONGJING WU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.8
Low-density Fe-doped ordered mesoporous carbon (CMK-3)-silica (SBA-15) nanocomposites with different Fe contents have been prepared by a catalytic carbonization procedure followed by high-temperature calcination in N2. From field emission-scanning electron microscope (FE-SEM) and high resolution-transmission electron microscope (HR-TEM) images, it can be concluded that CMK-3 particles are dispersed homogeneously into a silica matrix and form a novel, special and interesting composite nanostructure. The metal species (~18 nm) are dispersed on the surface of frameworks during the catalytic carbonization procedure and endow a magnetic property to the carbon–silica nanocomposites. The optimal reflection loss (RL) calculated from the measured permittivity and permeability is -19 dB at 17.2 GHz for an absorber thickness of 2.00 mm. Moreover, the electromagnetic (EM) wave absorption less than -10 dB is found to exceed 5.76 GHz as the layer thickness is 2.37 mm. The permittivity dispersion behaviors have been explained based on the Cole–Cole model and the conductivity contribution model. A new simple empirical model was also supposed to find the fitted curves of the multi-resonance imaginary permeability spectra of the composites. The EM wave can hardly be reflected on the absorber surface because of a better match between dielectric loss and magnetic loss, which originates from the combination of dielectric carbon–silica and magnetic Fe species.
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QIAN LIAN,HONGJING WU,LIUDING WANG,HAO WU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.3
Co doped mesoporous carbon composites (MC – Co) have been synthesized at di®erent carbon-ization temperatures via evaporation-induced multicomponent co-assembly strategy. Thenanostructures and chemical compositions of MC – Co composites were characterized by trans-mission electron microscope (TEM), scanning electron microscope (SEM) and X-ray di®ractionanalysis (XRD), etc. Their electromagnetic and microwave absorption properties were investi-gated in the frequency ranging from 2 GHz to 18 GHz. By the measurement of electromagneticparameters and theoretical simulation of re°ection loss (RL), the results showed that the mini-mum RL value of the optimum composite MC – Co-800 reached up to ? 41.9 dB at 13.5 GHz with athickness of only 1.80 mm, and the e®ective absorption bandwidth ( < ? 10 dB) is 4.4 GHz (from11.4 GHz to 15.8 GHz). This work demonstrated that the optimum carbonization temperature ofthe obtained composites is 800?C, which is critical to its electromagnetic properties. The excellentmicrowave absorption properties can be attributed to dielectric loss, Ohmic loss, and charac-teristic impedance matching. Therefore, the as-synthesized composites could be acted as a can-didate of microwave absorber, especially for the light weight demand.
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Yanyan Ren,Hongfeng Li,Guanglei Wu,Le Yang,Chenhui Zheng,LIUDING WANG,Fang Ren,Hui Xing,HONGJING WU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2
Al/Fe/Co doped ordered mesoporous carbon (OMC) composites have been synthesized by a facile method, and the influence of dopant on the electromagnetic (EM) and microwave absorption properties was investigated in the frequency range of 2–18 GHz. Compared with Fe/Co– OMC composites, the Al–OMC nanocomposite played a great role in adjusting values and frequency dependence of complex permittivity, which gives rise to significant improved microwave absorption and reduced thickness of the corresponding paraffin wax composites. Reflection loss (RL) values less than -5 dB and -10 dB were obtained in the frequency range of 9.2–18 GHz and 10.7–14.7 GHz with a single thickness of 2.00 mm, respectively. Such enhanced EM wave absorption property of the Al–OMC/paraffin wax composite was ascribed to its superior impedance matching characteristic. Thin thickness, broadband absorption microwave absorbers with Al doped OMC nanocomposites were obtained.
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Yanyan Yang,Yue Qi,Wenli Zhai,Jianing Tan,Suyang Feng,Jie Zhang,Mengxiao Shen,Liuding Wang,Xiaoyang Yu,Xiaoshu Qu 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.5
Tungsten oxide (WO3) has received attention as an electrochromic material because of its excellent properties. However,the long switch time and low coloration efficiency of WO3film limit its use. Herein, a nanocomposite film containingPreyssler-type polyoxometalate (POM) K12.5Na1.5[NaP5W30O110]·15H2O (P5W30) and WO3nanoparticles has been fabricatedby layer-by-layer (LbL) self-assembly methods and characterized by UV-Vis spectra, scanning electron microscopy, X-rayphotoelectron spectroscopy and electrochemical workstation. Compared to the pure WO3film, the [P5W30/WO3]20 filmhas better electrochromic properties. Then, the electrochromic properties of [P5W30/WO3]20 film were studied in differentelectrolyte. The results indicated that the composite film show high coloration efficiency (191.62 cm2C−1), fast switch time(2.58 s, 1.48 s), good CV stability (500 th) in 0.5 M LiClO4/PC electrolyte, and successfully assembled of an electrochromicdevice. These advantages can make the nanocomposite film become a promising candidate for potential application inelectrochromic devices.
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