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Wenfeng Xiang,Dong Li,Minghao Hu,Wenzheng Yue,Haizhong Guo 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.5
Single-layer MoS$_2$ films were deposited on sapphire substrates by using pulsed laser deposition. The substrate temperature dependence of the structural, optical and photoluminescence properties of single-layer MoS$_2$ films was investigated. An increased substrate temperature improved the surface morphology and the crystal quality of the MoS$_2$ films. Moreover, the absorption and the photoluminescence properties of the MoS$_2$ films were enhanced. In addition, the mechanism underlying the effect of substrate temperature on the properties of single-layer MoS$_2$ films is discussed.
Influence of Microstructure on the Electrical Properties of Heteroepitaxial TiN Films
WenFeng Xiang,Yuan Liu,JiaQi Zhang 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.3
Heteroepitaxial TiN films were deposited on Si substrates by pulse laser deposition at different substrate temperature. Themicrostructure and surface morphology of the films were investigated by X-ray diffraction (θ–2θ scan, ω-scan, and ϕ-scan)and atomic force microscopy. The electrical properties of the prepared TiN films were studied using a physical propertymeasurement system. The experimental results showed that the crystallinity and surface morphology of the TiN films wereimproved gradually with increasing substrate temperature below 700 °C. Specially, single crystal TiN films were preparedwhen substrate temperature is above 700 °C; However, the quality of TiN films gradually worsened when the substratetemperature was increased further. The electrical properties of the films were directly correlated to their crystalline quality. At the optimal substrate temperature of 700 °C, the TiN films exhibited the lowest resistivity and highest mobility of25.7 μΩ cm and 36.1 cm2/V s, respectively. In addition, the mechanism concerning the influence of substrate temperatureon the microstructure of TiN films is discussed in detail.
Event-triggered Stabilization of Linear Time-delay Systems by Static Output Feedback Control
Xiaoli Wang,Peng Xiang,Wenfeng Hu,Tingwen Huang 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.11
In this paper, we study the stabilization problem for a class of linear systems with a time-varying state delay. An event-triggered static output feedback controller is proposed, such that the sampling frequency and the update time of the controller are both lowered. First, we present a novel event-triggering mechanism depending not only on the output but also on an exponential term, with which less sampling is required and Zeno behavior can be excluded at the same time. Some sufficient conditions are then obtained, under which an exponential convergence can be achieved by means of the comparison principle approach. It is further shown that the parameters design can be easily given if the case reduces to the state feedback control. Moreover, two examples are presented to show the effectiveness of the results.
Shaohua Chen,Xuan Liu,Shengyang Dai,Wenfeng Xiang,Haizhong Guo,Junjian Li 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.2
CuxO (Cupric Oxide) nanotubes (NTs) were synthesized by using thermal oxidation of Cu nanowires (NWs) for 2 and 4 hours, respectively, and the effect of the components on their photoelectrical properties due to the infrared (IR) light with a wavelength of 1064 nm were investigated. In the 2-h CuxO NTs, the main component was Cu2O; however, the 4-h CuxO NTs were composed of a mixture of CuO and Cu2O. The photoelectric properties showed that the voltage difference and the sensitivity of 4-h CuxO NTs were more than 3 times those of the 2-h CuxO NTs, and its linear range was only about one-third that of the 2-h CuxO NTs. The above results were caused by the 4-h CuxO NTs containing a higher content of CuO, which had a suitable bandgap of 1.2 eV for light with a wavelength of 1064 nm. In addition, the response and the recovery times for the 4-h NTs were on the same order as those of the 2-h NTs. The conclusions from this article indicated that 4-h and 2-h NTs were very promising for the design of IR photodetector device with higher sensitivity and a larger detection range respectively.
Effects of air-impingement jet drying on drying kinetics and quality retention of tomato slices
Si Tan,Yiwen Miao,Hongxia Xiang,Weihua Tan,Wenfeng Li 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.5
The purpose was to explore the drying kinetics,the moisture effective diffusivities, color, total polyphenols,lycopene and antioxidant activities of dried tomatoslices by air-impingement jet drying (AIJD). The resultsshowed that high temperature increased the drying rate, andModified Page model accurately predicted the AIJD characteristicsof tomato slices. AIJD is better than hot airdrying in shortening drying time, enhancing drying rate anddecreasing the loss of total polyphenols, lycopene andantioxidant capacity of tomato slices. Tomato slices driedby AIJD also showed higher lightness and redness. Lycopenecontent and antioxidant activity of tomato slices driedby AIJD were increased by higher drying temperature. Based on experimental data, AIJD at 80 C can be used intomato drying process due to the advantages in dryingefficiency and content of bioactive compounds. This studywill provide helpful information for the production of highquality of dried tomato products.
Fang Wang,Yu Liu,Tian Yu,Cai,Wenfeng Xiang 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.3
In recent years, signifi cant attention has been directed toward exploring heterojunctions based on perovskite materials forultraviolet photodetectors. This study focuses on the fabrication of high-quality single-crystal Nb:SrTiO 3 (NSTO) fi lms onSi substrates, achieved through the utilization of a TiN thin fi lm as a buff er layer. The investigation delves into the lateralphotovoltaic effect exhibited by the fi lm. Characterization using X-ray diff raction and high-resolution transmission electronmicroscopy confi rms the exceptional quality of the NSTO fi lm. Notably, the observed position sensitivity attains an impressivevalue of 43.9 mV mm−1. Analysis of the lateral photovoltaic effect reveals response and relaxation times of approximately105.6 ns and 4.49 μs, respectively. Intriguingly, fi tting results for the relaxation time indicate minimal defects withinthe NSTO/TiN/Si heterostructures. These fi ndings underscore the signifi cant potential of NSTO/TiN/Si heterojunctions,presenting a promising avenue for their widespread application in the realm of position change technology.
Si Tan,Jianmin Tang,Wenjing Shi,Zhuwei Wang,Yuanyuan Xiang,Tingwei Deng,Xiaoxu Gao,Wenfeng Li,Shengyou Shi 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.3
The aim of this study was to investigate the effects of three different drying methods, freeze drying (FD), vacuum drying (VD) and oven drying (OD) on phenolic contents and antioxidant activities of litchi fruits. 20 polyphenols were exactly identified in the litchi fruits by UPLC-QqQ/MS. Significant losses were observed in the contents of total polyphenols and antioxidant activities in the dried litchi when compared with the fresh litchi. Principle component analysis indicated that there was significant difference of phenolic component between the use of thermal drying (VD and OD) and FD. Our results suggest that FD is the optimum drying method for litchi fruits considering the content of total polyphenols and antioxidant activities.