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  《北京工业大学学报》是北京工业大学主办的理工科综合性学术刊物,主要刊登光学工程、机械工程、电子信息与控制工程、计算机与软件工程、土木工程、交通工程、环境与能源工程、材料科学与工程、生物医学工程、应用数学等方面的学术论文。主要任务是反映校内外最新科研成果,促进教学和科研水平的提升,发现和培养人才,开展国内外学术交流。为中文核心期刊,已被国内外多家著名数据库收录。国内外公开发行,月刊,彩色印刷,全国各地邮局订购,邮发代号2-86。现任主编为聂祚仁教授。..... 更多>>
15 October 2020, Volume 46 Issue 10 Previous Issue   
Field Electron Emission of Nano-semiconductors: A Foundation and Vision of Vacuum Nanoelectronics
WANG Ruzhi, YAN Hui
2020, 46 (10):  1081-1090.  doi: 10.11936/bjutxb2020030015
Abstract ( 8 )   HTML ( 0 )   PDF (3722KB) ( 13 )  
A series of progresses and breakthroughs in the theoretical model, structural design and preparation of field electron emission cold cathodes in recent 20 years were summarized. The theory of the band bending mechanism for field emission in wide-band gap semiconductors and the structural enhancement mechanism of field emission from multilayer semiconductor films were proposed, and it was confirmed in the experimental study of field emission characteristics of nano-semiconductor. Several kinds of field emission cold cathodes with excellent field emission properties were developed in the experiment, which laid a foundation for the practical application of new vacuum nano electronic devices. The bottleneck problems and future development trend in this field were proposed.
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Research and Application Progress of Electrochromic Materials
ZHUANG Biying, WANG Hao, ZHANG Qianqian, LIU Jingbing, YAN Hui
2020, 46 (10):  1091-1102.  doi: 10.11936/bjutxb2020030019
Abstract ( 6 )   HTML ( 0 )   PDF (5765KB) ( 18 )  
With the development of electrochemical devices, people have certain requirements for “visualization” devices, so that electrochromism has gradually entered researchers' vision. Electrochromism refers to reversibly changing the optical properties (such as transmittance, absorption, and reflection, etc.) of a material under the condition of applying a certain voltage. The development history of electrochromic direction was introduced, and the classification, preparation methods, influence factors and current multi-functional application direction of electrochromic materials were summarized and analyzed. Based on the research, the classification and comparison of composite electrochromic materials were researched as a main focus, and their impact on electrochromic performance and potential application prospects were elaborated. Finally, the future development of electrochromic materials was prospected.
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Research Progress of Triboelectric Generator and Its Potential Application
HAN Changbao, WANG Manqi, HUANG Jianhua, ZHENG Jiayu, ZHAO Wenkang, ZHANG Hao, ZHANG Yongzhe
2020, 46 (10):  1103-1127.  doi: 10.11936/bjutxb2020040016
Abstract ( 3 )   HTML ( 0 )   PDF (24751KB) ( 3 )  
Triboelectric nanogenerator (TENG) technology can harvest mechanical energy to generate electricity based on friction electrification. Compared with the traditional electromagnetic induction technology, TENG has the advantages of high output voltage, light weight, small volume, flexibility, different shapes and high compatibility. In this work, the research progress and potential application of TENG technology based on our group's work were reviewed. The four modes and basic working principles were first introduced. Then, the research progress of TENG technology used as power source, voltage source, signal source and control source was discussed in detail. Finally, the industrial application prospect of the TENG technology was prospected.
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Research Status and Prospect of MgO Thin Films as Secondary Electron Emission Materials
ZHOU Fan, WANG Rui, LIANG Xuanming, LIU Wei, WANG Jinshu
2020, 46 (10):  1128-1138.  doi: 10.11936/bjutxb2020050009
Abstract ( 5 )   HTML ( 0 )   PDF (4660KB) ( 7 )  
Secondary electron emission (SEE) is a complicated process involving interaction between charged particles and solid surface. Due to advantages of high secondary electron yields (δ) and chemical stability, MgO thin films have broad applications in various photomultiplier tubes (PMT) and AC plasma display panels. The fundamental principles of SEE and the development of MgO thin films related SEE materials over the last several decades were reviewed in this paper. Based on literature review and previous research work in our group, the development of MgO and doped MgO thin films with high δ was presented. Finally, requirements and prospects for SEE materials nowadays were summarized.
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Atomically Dispersed Ag Supported TiO2 Mesoporous Nanobelts for Enhancement of Photocatalytic Oxidation Reactions
LI Yongli, ZHANG Zhipeng, WANG Jinshu, ZHOU Wenyuan, XU Xiangfeng, LUO Wei, ZHANG Nan
2020, 46 (10):  1139-1148.  doi: 10.11936/bjutxb2020050005
Abstract ( 2 )   HTML ( 0 )   PDF (8213KB) ( 5 )  
To investigate the effect of atomically dispersed Ag-loaded TiO2 mesoporous nanobelts on photocatalytic oxidation activity, Ag clusters-TiO2 nanobelts (NBs) were prepared through a facile process, including a mild reduction of Ag+ on the surface of TiO2 mesoporous nanobelts and a moderate heat treatment, which formed atomically dispersed Ag with strong metal-substrate interaction (MSI). The microstructure, light absorption, carrier separation and photocatalytic oxidation performance of prepared materials were investigated by XRD, STEM, UV-vis, PL, EXAFS and other techniques. Results show that Ag clusters-TiO2 NBs exhibit an excellent photocatalytic oxidation activity for gaseous pollutants under visible light irradiation. At low Ag loading (w=0.1%), the photodegradation efficiency of NO reaches 56.04%, and the removal rate of formaldehyde is 95.20%, which are 2.29 times and 1.22 times higher than that of Ag NPs-TiO2 NBs counterpart, respectively. TiO2 mesoporous nanobelts provide abundant anchor sites allowing Ag to disperse atomically, resulting in increased number of catalytically active sites. The strong interaction between Ag cluster and TiO2 and the reversible oxidation state of Ag cluster favor the activation of oxygen and the effective utilization of photogenerated carriers.
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Recent Progress of Two-dimensional Material Photodetectors Based on Photoelectronic Conversion
ZHANG Yongzhe, LI Songyu, CHEN Xiaoqing
2020, 46 (10):  1149-1166.  doi: 10.11936/bjutxb2020040015
Abstract ( 2 )   HTML ( 0 )   PDF (13335KB) ( 3 )  
Owing to the unique physical structure and excellent photoelectronic properties, two-dimensional (2D) materials have attracted more and more interest from researchers, which shows a huge potential for the applications of photodetection area. The 2D material-based photodetectors currently studied mainly belong to photon detectors. Their photodetecting porcess involves the directly photoelectronic conversion. The key point to the accomplishment of the 2D material photodetectors of high performance is to fully utilize photo-to-electric conversion mechanisms and take their advantages in the aspects of device performances and functions. By tracking previous works of the authors' research, the directly photoelectronic conversion mechanisms of photodetectors was investigated and the recent progress of 2D material-based photodetectors in terms of their performance enhancement, development of photoelectronic conversion mechanisms and structure design of devices was summarized. Finally, an outlook on the challenges and opportunities for 2D material photodetectors was presented.
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Charge Transfer States in Organic Photovoltaic Materials
ZHENG Zilong, ZHOU Rongkun, HU Shuangyuan, WANG Ruzhi, ZHANG Yongzhe
2020, 46 (10):  1167-1179.  doi: 10.11936/bjutxb2020040012
Abstract ( 3 )   HTML ( 0 )   PDF (4679KB) ( 5 )  
The sector of organic solar cells (OSCs) is developing very rapidly. The charge-transfer (CT) states, formed at the interface between electron-donor (D) and electron-acceptor (A) materials, play a significant role in the photoelectric physical processes, such as exciton dissociation, charge separation and recombination. Since the introduction of the D-A mixed heterojunction in the active layer, the CT states have been focused by many experimental and theoretical research groups. Following the previous works, the characteristics of CT states were briefly summarized, and the impact on the properties of CT states and the processes of radiative and non-radiative recombination was descibed from morphology configuration, electronic polarization and delocalization at the D-A interface. In addition, the micro-mechanism of photoelectric conversion in the active layer and the challenges faced in the design of novel materials was outlined.
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Alkali Metal Doping Engineering for Copper Indium Gallium Selenium (CIGS) Thin Film Solar Cells
CHEN Xiaoqing, YANG Shaohong, QU Jingjing, ZHANG Yongzhe, YAN Hui
2020, 46 (10):  1180-1191.  doi: 10.11936/bjutxb2020040014
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Copper indium gallium selenium (CIGS) solar cells have attracted intense interest because of their high light absorption coefficient, high photoelectric energy conversion efficiency, good stability and low production costs. Researchers have discovered that alkali metal doping engineering can significantly improve the performance of CIGS solar cells since the 1990s, and a lot of research on alkali metal doping has led to a series of breakthroughs. Based on the results of the research group, the major technological breakthroughs caused by alkali metal doping engineering were introduced in this paper. Three methods of alkali metal doping including the front doping, the middle doping and the post doping methods were presented briefly. Among them, the CIGS solar cells prepared by the post doping method showed highest conversion efficiency. The roles of alkali metal doping were adjusting the band gap of the CIGS absorption layer, passivating the defects, increasing the hole density, and suppressing the carrier recombination in the CIGS bulk and at the interface. These functions finally increased the open circuit voltage and fill factor of the solar cell. Alkali metals also affected the element distribution and micro-morphology of the absorption layer, although its effect on the device performance remained controversial.
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Research Progress in Molecular Design of Functional Polycarboxylic Acid Dispersant Materials
LIU Xiao, LUO Qifeng, GUAN Jianan, WANG Ziming, CUI Suping
2020, 46 (10):  1192-1203.  doi: 10.11936/bjutxb2020040013
Abstract ( 3 )   HTML ( 0 )   PDF (2371KB) ( 3 )  
Polycarboxylic acid is an important type of organic polymer materials. As an anionic polyelectrolyte, polycarboxylic acid has a significant dispersing effect on the particles in the medium, which is widely used as superplasticizer in cement-based materials, paint dispersant, inhibitor in water treatment, etc. In terms of the application of polycarboxylic acid in the field of dispersants, the researches on molecular design by domestic and foreign researchers in recent years were summarized. According to different structural shapes, the molecular structure of polycarboxylic acids was divided into three categories including linear structure, comb structure and branched structure (star-shape and hyperbranched shape). In linear polycarboxylic acid, the block structure has more advantages in performance. As for monomer selection, “green” monomer is the development direction. The comb polycarboxylic acid has unique side chain structure. Among the three synthesis routes, the macromonomer method is the most convenient, the coupling method can be used for special modification, and the initiation method can be used for precise design of polycarboxylic acid molecules. Branched polycarboxylic acids have higher functional group density and stronger steric hindrance effect, and have a broader prospect in molecular design and application. This paper provides an important guidance for future molecular design innovation.
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Research Progress on Preparation and Resource Utilization of Biomass Materials
MA Xiaoyu, LIU Tingting, CUI Suping, WANG Yali, GUO Hongxia, QIN Nannan
2020, 46 (10):  1204-1212.  doi: 10.11936/bjutxb2020050008
Abstract ( 6 )   HTML ( 0 )   PDF (4399KB) ( 142 )  
Fossil fuels such as coal and petroleum are non-renewable resources and are becoming increasingly depleted. Faced with the shortage of non-renewable resources and environmental pollution, people are eager to seek environmentally friendly and low-cost renewable materials to replace fossil fuels. The main components of biomass are cellulose, hemicellulose, lignin and a small amount of silica, which is a renewable resource rich in carbon and silicon. Therefore, the research on the preparation of high-performance chemicals with biomass as raw materials is of great significance. Combined with the research results of biomass comprehensive utilization in the early days of our research group, the chemical composition of biomass was mainly introduced, the preparation of carbon materials, silicon materials and composite materials using biomass as raw materials and their applications in industrial denitration and wastewater treatment were summarized. Finally, the future development prospects of biomass materials were presented.
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