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Zhaoran Wang,Huilong Dong,Xiaohui Yu,Yujin Ji,Tingjun Hou,Youyong Li 한국물리학회 2017 Current Applied Physics Vol.17 No.12
Porous monolayer materials have been proven potential for gas separation and purification, because of their natural pathways of controllable sizes and well-ordered distribution. In this work, a novel material, two-dimensional (2D) porous polyphthalocyanine (PPc) is investigated by density functional theory (DFT) simulations for separating NH3 from H2 and N2 during ammonia synthesis process. Based on the calculated diffusion barriers through transition state search, we demonstrate that 2D PPc is able to offer high selectivity (107) of (H2, N2)/NH3 at room temperature. Further molecular dynamics (MD) simulation also indicates that the 2D PPc can effectively separate NH3 from H2 and N2. Thus the 2D PPc is promising for the practical applications of synthetic ammonia process.
Cui Qin,Jing Zhao,Huilong Yu,Jian Zhang 한국광학회 2017 Current Optics and Photonics Vol.1 No.6
In this paper, we theoretically demonstrate that semiconductor optical amplifiers (SOAs) with strongwavelength dependence of gain and phase are capable of all-optical inverted and non-inverted wavelengthconversion (WC) over a wide range, with the assistance of an optical filter. First, the gain dynamics andphase dynamics in a common quantum well (QW) SOA with the In0.53Ga0.47As/In0.7322Ga0.2678As0.5810P0.4190material system are found to be strongly dependent on wavelength, which is mainly related to thewavelength dependence of the differential gain and the differential refractive-index change. Second, thewavelength dependence in an all-optical wavelength converter based on the QW SOA cascaded with adetuning band pass filter is studied. Simulations show that the quality of the converted signal has littledependence on the operation wavelength. Both inverted and non-inverted WC can be achieved, over alarge wavelength range. Therefore, although the gain and phase change are strongly wavelength-dependent,the effects of this dependence can be erased by appropriate optical filtering.
Flexible Nanoporous WO<sub>3–<i>x</i></sub> Nonvolatile Memory Device
Ji, Yongsung,Yang, Yang,Lee, Seoung-Ki,Ruan, Gedeng,Kim, Tae-Wook,Fei, Huilong,Lee, Seung-Hoon,Kim, Dong-Yu,Yoon, Jongwon,Tour, James M. American Chemical Society 2016 ACS NANO Vol.10 No.8
<P>Flexible resistive random access memory (RRAM) devices have attracted great interest for future nonvolatile memories. However, making active layer films at high temperature can be a hindrance to RRAM device fabrication on flexible substrates. Here, we introduced a flexible nanoporous (NP) WO3-x RRAM device using anodic treatment in a room-temperature process. The flexible NP WO3-x RRAM device showed bipolar switching characteristics and a high I-ON/IOFF ratio of similar to 10(5). The device also showed stable retention time over 5 X 10(5) s, outstanding cell-to-cell uniformity, and bending endurance over 10(3) cycles when maximum bending conditions.</P>