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Sun, Y. (author), Kang, Xuanwu (author), Zheng, Yingkui (author), Wei, Ke (author), Li, Pengfei (author), Wang, Wenbo (author), Liu, Xinyu (author), Zhang, Kouchi (author)The optimization of mesa etch for a quasi-vertical gallium nitride (GaN) Schottky barrier diode (SBD) by inductively coupled plasma (ICP) etching was comprehensively investigated in this work, including selection of the etching mask, ICP power, radio frequency (RF) power, ratio of mixed gas, flow rate, and chamber pressure, etc. In particular...journal article 2020
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Sun, J. (author), Zhang, Shuo (author), Zhan, Teng (author), Liu, Zewen (author), Wang, Junxi (author), Yi, Xiaoyan (author), Li, Jinmin (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)A high responsivity and controllable recovery ultraviolet (UV) photodetector based on a tungsten oxide (WO<sub>3</sub>) gate AlGaN/GaN heterostructure with an integrated micro-heater is reported for the first time. The WO<sub>3</sub>nanolayer was deposited by physical vapor deposition (PVD) for deep UV absorption and the micro-heater was...journal article 2020
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Sun, J. (author), Hu, D. (author), Liu, Zewen (author), Middelburg, L.M. (author), Vollebregt, S. (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)A micro-scale pressure sensor based on suspended AlGaN/GaN heterostructure is reported with non-linear sensitivity. By sealing the cavity, vacuum sensing at various temperatures was demonstrated. To validate the proposed concept of the AlGaN/GaN vacuum sensor, a 700 µm diameter circular membrane was electrically characterized under applied...journal article 2020
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Xin, H. (author), Mosallam, Ayman (author), Correia, José A.F.O. (author), Liu, Yuqing (author), He, Jun (author), Sun, Yun (author)Design optimization of fiber-reinforced polymeric (FRP) composite products is essential to facilitate their applications in engineering structures. For bridge structures, the main design optimization goals are the reduction of FRP material consumption and the structure weight, which aim to reduce the initial construction cost and achieve a...journal article 2020
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Dong, Xu (author), Shen, Luyi (author), Zhao, Jianpeng (author), Liu, Xuefeng (author), Sun, Yuli (author), Golsanami, Naser (author), Wang, Fei (author), Bi, Haisheng (author), Zitha, P.L.J. (author)Complete and thorough core cleaning is a critical prerequisite for the precise measurements of most rock's petrophysical parameters. In shale, the oil cleaning process, aimed to remove the volatile hydrocarbons, is often complicated by the requirement for intact solid organic. Evaluation of shale's cleaning methods needs to take structural...journal article 2020
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Sun, J. (author), Sokolovskij, R. (author), Iervolino, E. (author), Liu, Zewen (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)We developed an AlGaN/GaN high electron mobility transistor (HEMT) sensor with a tungsten trioxide (WO<sub>3</sub>) nano-film modified gate for nitrogen dioxide (NO<sub>2</sub>) detection. The device has a suspended circular membrane structure and an integrated micro-heater. The thermal characteristic of the Platinum (Pt) micro-heater and the...journal article 2019
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Zhang, H. (author), Liu, Y. (author), Wang, Lingen (author), Sun, Fenglian (author), Fan, Xuejun (author), Zhang, Kouchi (author)The nanoindentation test was conducted in this paper to investigate the indentation hardness, plasticity and initial creep properties of pressure sintered nanosilver joint at various test temperatures. The effects of strain rate on the indentation hardness were first investigated. Then yield stress of nanosilver sintered joint was studied in...journal article 2019
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Sun, J. (author), Zhan, Teng (author), Liu, Zewen (author), Wang, Junxi (author), Yi, Xiaoyan (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)This paper demonstrates a method to reduce the decay time in AlGaN/GaN photodetectors by a pulsed heating mode. A suspended AlGaN/GaN heterostructure photodetector integrated with a micro-heater is fabricated and characterized under ultraviolet illumination. We have observed that the course of persistent photoconductivity was effectively...journal article 2019
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Sun, Y. (author), Kang, Xuanwu (author), Zheng, Yingkui (author), Lu, Jiang (author), Tian, Xiaoli (author), Wei, Ke (author), Wu, Hao (author), Wang, Wenbo (author), Liu, Xinyu (author), Zhang, Kouchi (author)Gallium nitride (GaN)-based vertical power Schottky barrier diode (SBD) has demonstrated outstanding features in high-frequency and high-power applications. This paper reviews recent progress on GaN-based vertical power SBDs, including the following sections. First, the benchmark for GaN vertical SBDs with different substrates (Si, sapphire, and...review 2019
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Hong, Hao (author), Sun, J. (author), Wu, Cinan (author), Liu, Zewen (author)High performance mixed potential type NO<sub>2</sub> sensors using porous yttria-stabilized zirconia (YSZ) layers doped with different concentration graphite as solid electrolyte and LaFeO<sub>3</sub> as sensing electrode were fabricated and characterized. LaFeO<sub>3</sub> was prepared by a typical citrate sol–gel method and characterized...journal article 2019
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Azizi, Sadegh (author), Sun, Mingyu (author), Liu, Gaoyuan (author), Popov, M. (author), Terzija, Vladimir (author)Short-circuit faults close to either end of a transmission line, are normally cleared instantaneously by the distance relay at that end and after hundreds of milliseconds, i.e., in Zone 2 operating time, by the relay at the opposite end of the line. This sequential tripping can be accelerated on condition that a reliable communication link is...journal article 2019
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Zhang, H. (author), Liu, Y. (author), Wang, Lingen (author), Sun, Fenglian (author), Fan, Jiajie (author), Placette, Mark D. (author), Fan, Xuejun (author), Zhang, Kouchi (author)Modern power electronics has the increased demands in current density and high-temperature reliability. However, these performance factors are limited due to the die attach materials used to affix power dies microchips to electric circuitry. Although several die attach materials and methods exist, nanosilver sintering technology has received...journal article 2019
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Liu, Y. (author), Zhang, H. (author), Wang, Lingen (author), Fan, Xuejun (author), Zhang, Kouchi (author), Sun, Fenglian (author)Purpose: Crack and stress distribution on dies are key issues for the pressure-assisted sintering bonding of power modules. The purpose of this research is to build a relationship among stress distributions, sintering sequences and sintering pressures during the sintering processes. Design/methodology/approach: Three sintering sequences, S(a)...journal article 2019
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Sun, J. (author), Zhan, Teng (author), Liu, Zewen (author), Wang, Junxi (author), Yi, Xiaoyan (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)A suspended WO<sub>3</sub>-gate AlGaN/GaN heterostructure photodetector integrated with a micro-heater is micro-fabricated and characterized for ultraviolet photo detection. The transient optical characteristics of the photodetector at different temperatures are studied. The 2DEG-based photodetector shows a recovery (170 s) time under 240 nm...journal article 2019
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Sun, J. (author), Sokolovskij, R. (author), Iervolino, E. (author), Santagata, F. (author), Liu, Zewen (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author)A suspended AlGaN/GaN high electron mobility transistor (HEMT) sensor with a tungsten trioxide (WO 3 ) nanofilm modified gate was microfabricated and characterized for ppm-level acetone gas detection. The sensor featured a suspended circular membrane structure and an integrated microheater to select the optimum working temperature. High working...journal article 2019
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Zhang, Youyou (author), Mosallam, Ayman (author), Liu, Yuqing (author), Sun, Yun (author), Xin, H. (author), He, Jun (author)In this study, flexural behaviors of the pultruded composite laminate were evaluated through experiments and theoretical analysis. Three-point flexural tests were performed for pultruded specimens. The typical failure mode for the longitudinal flexural specimens was local crush on the top surface accompanied with local cracks on the bottom...journal article 2019
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Lyu, X. (author), Liu, Huiqing (author), Pang, Zhanxi (author), Sun, Zhixue (author)Steam channeling, one serious problem in the process of steam flooding in heavy oil reservoir, decreases the sweep efficiency of steam to cause a lower oil recovery. Viscosity reducer and nitrogen foam, two effective methods to improve oil recovery with different mechanism, present a satisfactory result after steam flooding. In this article,...journal article 2018
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Zhan, X. (author), Liu, Chuang (author), Zhou, Ge (author), Zhang, Zi-Ke (author), Sun, Gui-Quan (author), Zhu, Jonathan J. H. (author), Jin, Zhen (author)The interaction between disease and disease information on complex networks has facilitated an interdisciplinary research area. When a disease begins to spread in the population, the corresponding information would also be transmitted among individuals, which in turn influence the spreading pattern of the disease. In this paper, firstly, we...journal article 2018
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Liu, Nan (author), Liu, D. (author), Wang, Weifei (author), Hollmann, F. (author), Xu, Long (author), Ma, Yunjian (author), Yang, Bo (author), Bai, Weidong (author), Sun, Xiaotao (author), Wang, Yonghua (author)α‐Linolenic acid‐rich diacylglycerol has been demonstrated with promising health promotion functions. This study examined the production, immobilization of lipase PCL, and its application in the synthesis of diacylglycerol by esterification of α‐linolenic acid with glycerol. The resin ECR8806 was selected as an effective support for the...journal article 2018
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Liu, Yang (author), Zhang, H. (author), Wang, Lingen (author), Fan, Xuejun (author), Zhang, Kouchi (author), Sun, Fenglian (author)The microstructure, thickness, porosity, and shear performance of the silver (Ag) sintering layers under different sintering pressures were investigated. Experimental results demonstrated that the thickness and the porosity of the sintering layer decreased when the sintering pressure varied from 5 MPa to 30 MPa. This densification phenomenon...journal article 2018