Research progress of two-dimensional semiconductor infrared photodetector (Invited)

2021 ◽  
Vol 50 (1) ◽  
pp. 20211017-20211017
Author(s):  
许航瑀 Hangyu Xu ◽  
王鹏 Peng Wang ◽  
陈效双 Xiaoshuang Chen ◽  
胡伟达 Weida Hu
2021 ◽  
Vol 50 (1) ◽  
pp. 20211017-20211017
Author(s):  
许航瑀 Hangyu Xu ◽  
王鹏 Peng Wang ◽  
陈效双 Xiaoshuang Chen ◽  
胡伟达 Weida Hu

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5136
Author(s):  
Xiaoxin Fang ◽  
Qiwu Luo ◽  
Bingxing Zhou ◽  
Congcong Li ◽  
Lu Tian

The computer-vision-based surface defect detection of metal planar materials is a research hotspot in the field of metallurgical industry. The high standard of planar surface quality in the metal manufacturing industry requires that the performance of an automated visual inspection system and its algorithms are constantly improved. This paper attempts to present a comprehensive survey on both two-dimensional and three-dimensional surface defect detection technologies based on reviewing over 160 publications for some typical metal planar material products of steel, aluminum, copper plates and strips. According to the algorithm properties as well as the image features, the existing two-dimensional methodologies are categorized into four groups: statistical, spectral, model, and machine learning-based methods. On the basis of three-dimensional data acquisition, the three-dimensional technologies are divided into stereoscopic vision, photometric stereo, laser scanner, and structured light measurement methods. These classical algorithms and emerging methods are introduced, analyzed, and compared in this review. Finally, the remaining challenges and future research trends of visual defect detection are discussed and forecasted at an abstract level.


2018 ◽  
Vol 6 (40) ◽  
pp. 10672-10686 ◽  
Author(s):  
Qing Zhang ◽  
Huanli Dong ◽  
Wenping Hu

This article places special focus on the recent research progress of the EP method in synthesizing CPs. In particular, their potential applications as 2D CPs are summarized, with a basic introduction of the EP method, its use in synthesizing CPs as well as the promising applications of the obtained CPs in different fields. Discussions of current challenges in this field and future research directions are also given.


2021 ◽  
Vol 50 (1) ◽  
pp. 20211018-20211018
Author(s):  
陈红富 Hongfu Chen ◽  
罗曼 Man Luo ◽  
沈倪明 Niming Shen ◽  
徐腾飞 Tengfei Xu ◽  
秦嘉怡 Jiayi Qin ◽  
...  

2019 ◽  
Vol 9 (3) ◽  
pp. 388 ◽  
Author(s):  
Jing Tian ◽  
Hongyu Shi ◽  
Haoquan Hu ◽  
Bo Chen ◽  
Yongfang Bao ◽  
...  

To reduce the radar cross section at microwave frequencies, it is necessary to implement electromagnetic (EM) absorbing devices/materials to decrease the strength of reflected waves. In addition, EM absorbers also find their applications at higher spectrum such as THz and optical frequencies. As an atomic-thick two-dimensional (2D) material, graphene has been widely used in the development of EM devices. The conductivity of graphene can be electrostatically or chemically tuned from microwave to optical light frequencies, enabling the design of reconfigurable graphene EM absorbers. Meanwhile, the derivatives of graphene such as reduced graphene oxide (rGO) also demonstrate excellent wave absorbing properties when mixed with other materials. In this article, the research progress of graphene and its derivatives based EM absorbers are introduced and the future development of graphene EM absorbing devices are also discussed.


2020 ◽  
Vol 12 (1) ◽  
Author(s):  
JiPing Zhu ◽  
GuangShun Xiao ◽  
XiuXiu Zuo

AbstractTwo-dimensional black phosphorus (2D BP), an emerging material, has aroused tremendous interest once discovered. This is due to the fact that it integrates unprecedented properties of other 2D materials, such as tunable bandgap structures, outstanding electrochemical properties, anisotropic mechanical, thermodynamic, and photoelectric properties, making it of great research value in many fields. The emergence of 2D BP has greatly promoted the development of electrochemical energy storage devices, especially lithium-ion batteries. However, in the application of 2D BP, there are still some problems to be solved urgently, such as the difficulty in the synthesis of large-scale high-quality phosphorene, poor environmental stability, and the volume expansion as electrode materials. Herein, according to the latest research progress of 2D BP in the field of energy storage, we systematically summarize and compare the preparation methods of phosphorene and discuss the basic structure and properties of BP, especially the environmental instability and passivation techniques. In particular, the practical application and challenges of 2D BP as anode material for lithium-ion batteries are analyzed in detail. Finally, some personal perspectives on the future development and challenges of BP are presented.


2021 ◽  
Vol 79 (4) ◽  
pp. 443
Author(s):  
Yumiao Lu ◽  
Wei Chen ◽  
Yanlei Wang ◽  
Feng Huo ◽  
Yihui Dong ◽  
...  

2021 ◽  
Vol 5 (3) ◽  
Author(s):  
Yufen Shang ◽  
Yuqing Xu ◽  
Fang Wang

With the continuous development of science and technologies in China, radiotherapy technology in medical field has been very significantly developing, and intensity modulated radiation therapy (IMRT) technology has been the most widely used. This paper first introduces the components and types of two-dimensional matrix detector, two-dimensional ionization chamber matrix detector and two-dimensional semiconductor matrix detector, then analyzes the dosimetric characteristics of the two-dimensional matrix detector. In the end, the various applications of the two-dimensional matrix detector are analyzed and discussed in detail. The paper aims to promote the two-dimensional matrix detector’s development  in the field of radiotherapy in China.


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