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| 1 | Direct growth of hexagonal boron nitride films on dielectric sapphire substrates by pulsed laser deposition for optoelectronic applications显示文摘Recently,hexagonal boron nitride(h-BN),an ultra-wide bandgap semiconductor,has attracted considerable atten-tion owing to its excellent properties.In thin films grown on metal catalysts,contamination and damage induced by a transfer process cannot be avoided.Therefore,synthesizing h-BN films on non-catalytic dielectric substrates is desirable for electronic applications.In this study,we demonstrate the direct growth of high-quality h-BN films with a controllable thickness on sapphire substrates by using the pulsed laser deposition(PLD)technique.The effects of the deposition conditions and laser parameters on the growth of the h-BN films are systematically investigated by evaluating their characteristic Raman peaks.Among the various growth parameters studied,the substrate temperature has the greatest influence on the crystalline quality of the h-BN films,and the optimal pres-sure varies depending on the target-substrate distance.The h-BN film grown under optimal conditions exhibits a narrow Raman line width of∼30 cm^(−1),indicating a high crystalline quality.The photodetectors fabricated from the PLD-grown h-BN films exhibit superior deep-ultraviolet detection performance with a large on/offratio of>104,high photoresponsivity,and a sharp cut-offwavelength of 220 nm.This study presents the possibility of producing high-quality h-BN films by applying PLD on dielectric substrates for optoelectronic applications. | Gaokai Wang Jingren Chen Junhua Meng Zhigang Yin Ji Jiang Yan Tian Jingzhen Li Jinliang Wu Peng Jin Xingwang Zhang | 2021 | Fundamental Research2021，1，6： | 1 |
| 2 | Recommendation about the perioperative prevention of infection to healthcare workers and the anesthesia management of children with SARS-CoV-2 infection显示文摘Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has spread widely and persistently over 100 countries.New challenges have occurred in the perioperative management of airway and anesthesia in children diagnosed with SARS-CoV-2 infection.According to current publications and to our own experiences in anesthesia management for cases with SARS-CoV-2 suspected,we reviewed concerns about the perioperative prevention of SARS-CoV-2 to medical staff and the anesthesia strategy to the patient. | Jinjin Huang Yaoqin Hu Jiangmei Wang Dongpi Wang Zhirui Zhu Zhiyong Hu Ziying Jin Hongfei Lin Wenfang Huang Weiqing Shen Yilei Jiang Miaofeng Hu Jingzhen Wu Yaojun Suo Qiang Shu | 2020 | World Journal of Pediatric Surgery2020，3，1： | 0 |
| 3 | Reconfigurable logic and in-sensor encryption operations in an asymmetrically tunable van der Waals heterostructure显示文摘Reconfigurable devices can be used to achieve multiple logic operation and intelligent optical sensing with low power consumption,which is promising candidates for new generation electronic and optoelectronic integrated circuits.However,the versatility is still limited and need to be extended by the device architectures design.Here,we report an asymmetrically gate two-dimensional(2D)van der Waals heterostructure with hybrid dielectric layer SiO_(2)/hexagonal boron nitride(h-BN),which enable rich function including reconfigurable logic operation and in-sensor information encryption enabled by both volatile and non-volatile optoelectrical modulation.When the partial gate is grounded,the non-volatile light assisted electrostatic doping endowed partially reconfigurable doping between n-type and p-type,which allow the switching of logic XOR and not implication(NIMP).When the global gate is grounded,additionally taking the optical signal as another input signal,logic AND and OR is realized by combined regulation of the light and localized gate voltage.Depending on the high on/off current ratio approaching 105 and reliable&switchable logic gate,in-sensor information encryption and decryption is demonstrated by manipulating the logic output.Hence,these results provide strong extension for current reconfigurable electronic and optoelectronic devices. | Fan Gong Wenjie Deng Yi Wu Fengming Liu Yihao Guo Zelin Che Jingjie Li Jingzhen Li Yang Chai Yongzhe Zhang | 2024 | Nano Research2024，17，4： | 0 |
| 4 | Remote heteroepitaxy of transition metal dichalcogenides through monolayer hexagonal boron nitride显示文摘As a very promising epitaxy technology,the remote epitaxy has attracted extensive attention in recent years,in which graphene is the most used interlayer material.As an isomorphic of graphene,two-dimensional(2D)hexagonal boron nitride(h-BN),is another promising interlayer for the remote epitaxy.However,there is a current debate on the feasibility of using h-BN as interlayer in the remote epitaxy.Herein,we demonstrate that the potential field of sapphire can completely penetrate monolayer h-BN,and hence the remote epitaxy of ZrS_(2) layers can be realized on sapphire substrates through monolayer h-BN.The field of sapphire can only partially penetrate the bilayer h-BN and result in the mixing of remote epitaxy and van der Waals(vdWs)epitaxy.Due to the weak interfacial scattering and high crystalline quality of ZrS_(2) epilayer,the ZrS_(2) photodetector with monolayer h-BN shows the best performance,with an on/off ratio of more than 2×10^(5) and a responsivity up to 379 mA·W^(-1).This work provides an efficient approach to prepare single-crystal transition metal dichalcogenides and their heterojunctions with h-BN,which have great potential in developing large-area 2D electronic devices. | Jidong Huang Jingren Chen Junhua Meng Siyu Zhang Ji Jiang Jingzhen Li Libin Zeng Zhigang Yin Jinliang Wu Xingwang Zhang | 2024 | Nano Research2024，17，4： | 0 |
| 5 | SAR Change Detection Algorithm Combined with FFDNet Spatial Denoising显示文摘Objectives:When detecting changes in synthetic aperture radar(SAR)images,the quality of the difference map has an important impact on the detection results,and the speckle noise in the image interferes with the extraction of change information.In order to improve the detection accuracy of SAR image change detection and improve the quality of the difference map,this paper proposes a method that combines the popular deep neural network with the clustering algorithm.Methods:Firstly,the SAR image with speckle noise was constructed,and the FFDNet architecture was used to retrain the SAR image,and the network parameters with better effect on speckle noise suppression were obtained.Then the log ratio operator is generated by using the reconstructed image output from the network.Finally,K-means and FCM clustering algorithms are used to analyze the difference images,and the binary map of change detection results is generated.Results:The experimental results have high detection accuracy on Bern and Sulzberger’s real data,which proves the effectiveness of the method. | Yuqing Wu Qing Xu Zheng Zhang Jingzhen Ma Tianming Zhao Xinming Zhu | 2023 | Journal of Environmental & Earth Sciences2023，5，2： | 0 |
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