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| 1 | A fluorescent Eu(Ⅲ) MOF for highly selective and sensitive sensing of picric acid显示文摘A metal-organic framework [Eu_3L_3(CH_3COO)_2(H_2O)_2(μ_3-OH)]·3 DMF,(EuL, H_2L=9H-carbazole-2,7-dicarboxylic acid,DMF=N,N-dimethylformamide) has been synthesized under solvothermal conditions and structurally characterized. In EuL,Eu_6O_8 clusters are four-bridged by carboxylates to form parallel-aligned Eu–O–C chains, which are further linked by the carbazole moieties of L^(2-) ligands to form the three-dimensional framework with rhombic channels. The EuL material with characteristic emission of Eu^(3+) ion exhibits significant luminescence quenching response for picric acid(PA) and the linear Stern-Volmer plot was observed in the concentration range of 0.05–0.15 mM with K_(sv) of 98074 M^(-1). As far as we know, this Ksv is among the highest values for COFs and MOFs in detection of PA. The excellent anti-interference ability and repeatability were also verified by experiments. Lastly, we investigated the luminescence quenching mechanism in the EuL sensing system. | Qianqian Chen Jiahui Cheng Jin Wang Liang Li Zhipeng Liu Xinhui Zhou Yujian You Wei Huang | 2019 | Science China Chemistry2019，62，2： | 3 |
| 2 | W-Band High-Efficiency Waveguide Slot Array Antenna with Low Sidelobe Levels Based on Silicon Micromachining Technology显示文摘A high-efficiency waveguide slot array antenna with low sidelobe level(SLL)is investigated for W-band applications.The silicon micromachining technology is utilized to realize multilayer antenna architecture by three key steps of selective etching,gold plating and Au-Au bonding.The radiating slot based on this technique becomes thick with a minimum thickness of 0.2 mm and accompanies with the decrease of slot’s radiation ability.To overcome this weakness,a stepped radiation cavity is loaded on the slot.The characteristic of cavityloaded slot is investigated to synthesize the low-SLL array antenna.The unequal hybrid corporate feeding network is constructed to achieve sidelobe suppression in the E-plane.A pair of 16×8 low-SLL and high-effciency slot arrays is fashioned and confirmed experimentally.The bandwidth with the radiation effciency higher than 80%is 92.3–96.3 GHz.The SLLs in both E-and H-planes are below−19 dB. | YAO Shisen CHENG Yujian BAI Hang FAN Yong | 2022 | Chinese Journal of Electronics2022，31，4： | 2 |
| 3 | Unraveling the role of Ti3C2 MXene underlayer for enhanced photoelectrochemical water oxidation of hematite photoanodes显示文摘Hematite is regarded as a promising photoanode for photoelectrochemical(PEC) water splitting.However,the charge recombination occurred at the interface of FTO/hematite strictly limits the PEC performance of hematite.Herein,we reported a Ti3C2 MXene underlayer modified hematite(Ti-Fe2O3) photoanode via a simple drop-casting followed by hydrothermal and annealing processes.Owing to the bifunctional role of Ti3C2 MXene underlayer in improving the interfacial properties of FTO/hematite and providing Ti source for the construction of Fe2 TiO5/Fe2O3 heterostructure in hematite nanostructure,the bulk and interfacial charge transfer dynamics of hematite are significantly enhanced,and consequently enhancing the PEC performance.Compared with the pristine hematite,the as-prepared Ti-Fe2O3 photoanode shows an increased photocurrent density from 0.80 mA/cm^(2) to 1.30 mA/cm^(2) at 1.23 V vs.RHE.Moreover,a further promoted PEC performance including a dramatically increased photocurrent density of 2.49 mA/cm^(2) at1.23 V vs.RHE and an obviously lowered onset potential is achieved for the Ti-Fe2O3 sample after the subsequent surface F-treatment and the loading of FeNiOOH cocatalyst.Such results suggest that the introduction of Ti3C2 MXene underlayer is a facile but effective approach to improve the PEC water splitting activity of hematite. | Haiyan Ji Shan Shao Guotao Yuan Cheng Lu Kun Feng Yujian Xia Xiaoxin Lv Jun Zhong Hui Xu Jiujun Deng | 2021 | Journal of Energy Chemistry2021，30，1： | 1 |
| 4 | Millime- ter-wave shaped-beam substrate integrated conformal array antenna 显示文摘 | CHENG Yujian XU Hang MA Da | 2013 | IEEE Transactions on Antennas and Propagation2013，61，9： | 1 |
| 5 | Study of tensile failure mechanisms in scarf repaired CFRP laminates显示文摘 | Cheng Xiaoquan Yasir Baig Hu Renwei Gao Yujian Zhang Jikui | 2013 | International Journal of Adhesion and Adhesives2013，，： | 1 |
| 6 | Half mode substrate integrated waveguide (HMSIW) directional filter显示文摘 | Yujian Cheng Wei Hong Ke Wu | 2007 | IEEE Microwave and Wireless Components Letters2007，17，7： | 1 |
| 7 | Design of a multimode beamforming network based on the scattering matrix analysis显示文摘The investigation of the multimode beamforming network (BFN) has been developed from its scattering matrix (S-matrix) analysis. A substrate integrated waveguide (SIW) BFN is designed and fabricated on a single Rogers 5880 substrate. This device is not only marked by features of conventional BFN,such as Butler matrix,but also has additional benefits,e.g. more compact configuration and higher radiation efficiency. Measured and simulated results based on the proposed structure are in a good agreement,which indicates that this novel type of BFN has good characteristics and presents an excellent candidate in the development of intelligent microwave and millimeter-wave multibeam antenna systems. | CHENG YuJian HONG Wei WU Ke | 2009 | Science in China(Series F)2009，52，7： | 0 |
| 8 | Effect of PMMA Removal Methods on Opto-Mechanical Behaviors of Optical Fiber Resonant Sensor With Graphene Diaphragm显示文摘Regarding the dependence of the treatment of removing polymethyl methacrylate(PMMA)from graphene upon the prestress in the film,two typical PMMA removal methods including acetone-vaporing and high-temperature annealing were investigated based on the opto-mechanical behaviors of the developed optical fiber Fabry-Perot(F-P)resonant sensor with a 125-pm diameter and~10-layer-thickness graphene diaphragm.The measured resonant responses showed that the F-P sensor via annealing process exhibited the resonant frequency of 481kHz and quality factor of 1034 at~2Pa and room temperature,which are respectively 2.5 times and 33 times larger than the acetone-treated sensor.Moreover,the former achieved a high sensitivity of 110.4kHz/kPa in the tested range of 2Pa-2.5kPa,apparently superior to the sensitivity of 16.2kHz/kPa obtained in the latter.However,the time drift of resonant frequency also mostly tended to occur in the annealed sensor,thereby shedding light on the opto-mechanical characteristics of graphene-based F-P resonant sensors,along with an optimized optical excitation and detection scheme. | Yujian LIU Cheng LI Shangchun FAN Xuefeng SONG | 2022 | Photonic Sensors2022，12，2： | 0 |
| 9 | Blindness-free beam scanning antenna with array of array architecture:principle,design,and experiment显示文摘This paper presents a 66–76-GHz sparsely-excited phased array antenna with the array of array(AoA)architecture for eliminating the blindness and suppressing the grating lobe when scanning.For the array antennas printed on the thick dielectric layers with high relative permittivity,scanning blindness appears and seriously impacts the radiation performance.To address this issue,the Ao A topology is developed first.It finds that the scanning blindness appears due to the coupling of the radiating Floquet modes to the non-radiating surface wave(SW)modes.Therefore,the array is divided into two types of domino subarrays.The inner-phase distributions are introduced into the domino subarrays to break the one-to-one relationship between the Floquet mode and the SW mode.Then,the blindness inside±60°scanning volume is eliminated by the aperiodic subarrays.Meanwhile,the aperiodic inner-phase distributions enhance the aperiodicity of the array and contribute to suppressing the grating lobe when scanning.Next,the meta-surface-based dipole with the shorted post is chosen as the unit cell for the proposed aperiodic array.Based on these methods,the array achieves the wide-scanning performance of±60°in the E-plane and±30°in the H-plane,without the blindness and the grating lobe.Finally,the 16×16 array is built and simulated with the dimension of32 mm×32 mm.At the highest operating frequency,the simulated gains are 28.42,25.17,and 24.01 d Bi when scanning to the broadside,50°in the E-plane,and 30°in the H-plane,respectively.Compared to the ideal gain,it shows that the simulated radiation efficiency is about 84.13%,62.08%,and 35.23%when scanning to the broadside,50°in the E-plane,and 30°in the H-plane,respectively.The worst transmission coefficient,i.e.,the worst isolation,is-11.97 d B between the central element and its two adjacent elements in the E-plane.The array prototypes are fabricated,and the experiments are carried out to verify the correctness of the principle and design.Compared to existing antenna array designs,due to the employment of the Ao A architecture,the proposed antenna achieves 51.30%channel reduction with both blindness-free and grating-lobe-free performance.Meanwhile,due to the regular and periodic subarray spacing,the best realizability is achieved for the sparsely-excited phased array at the millimeter-wave bands.This is valuable for the wide-scanning phased array antennas in the sixth-generation(6G)highly-integrated communication systems at the millimeter-wave bands. | Jianxu SUN Yujian CHENG | 2024 | Science China(Information Sciences)2024，67，3： | 0 |
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