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Special Issue on Two-dimensional Optical Functional Materials and Devices|4 Article(s)
Fabrication and Photocatalytic Activity of Heterojunction Type CuO/ZnO Composite Nanowires
Zhe JIA, Shuai REN, Jiejing ZHANG, Shiyong GAO, and Jinzhong WANG
At room temperature， CuO nanowires were prepared on Cu substrate by solution method. Subsequently ZnO nanoparticles were grown on the surface of the CuO nanowires by solvothermal method to construct CuO/ZnO composite nanowires heterostructures. The morphology， structure and element composition of samples were characterized by using scanning electron microscope， transmission electron microscope， X-ray diffractometer and X-ray photoelectron spectroscopy. The results show that CuO/ZnO composite nanowires are composed of ZnO nanoparticles and CuO nanowires. Under simulated sunlight， the photocatalytic performances of the samples were studied by using Methylene Blue （MB） solution as the simulated pollutant. As a result， compared with pure CuO nanowires， CuO/ZnO composite nanowires can make the photodegradation efficiency of MB solution up to 40%， and display better photocatalytic activity. The research on photocatalytic mechanism indicates that the enhancement of the photocatalytic activity of CuO/ZnO nanocomposites is mainly due to the p-n heterojunction formed by the combination of CuO and ZnO， which effectively promotes the separation of photogenerated carriers.. At room temperature， CuO nanowires were prepared on Cu substrate by solution method. Subsequently ZnO nanoparticles were grown on the surface of the CuO nanowires by solvothermal method to construct CuO/ZnO composite nanowires heterostructures. The morphology， structure and element composition of samples were characterized by using scanning electron microscope， transmission electron microscope， X-ray diffractometer and X-ray photoelectron spectroscopy. The results show that CuO/ZnO composite nanowires are composed of ZnO nanoparticles and CuO nanowires. Under simulated sunlight， the photocatalytic performances of the samples were studied by using Methylene Blue （MB） solution as the simulated pollutant. As a result， compared with pure CuO nanowires， CuO/ZnO composite nanowires can make the photodegradation efficiency of MB solution up to 40%， and display better photocatalytic activity. The research on photocatalytic mechanism indicates that the enhancement of the photocatalytic activity of CuO/ZnO nanocomposites is mainly due to the p-n heterojunction formed by the combination of CuO and ZnO， which effectively promotes the separation of photogenerated carriers..
Acta Photonica Sinica
- Publication Date: Jan. 25, 2021
- Vol. 50, Issue 1, 67 (2021)
Application of Photonic Crystalline Infrared Stealth Films on Surface of Vehicle Engine Compartments
Biao LIU, Jiaming SHI, Xiangyin LÜ, Zongsheng CHEN, and Zhigang LI
In order to study the infrared stealth effect of photonic crystal films in practical application scenarios， photonic crystal films and low emissivity films with mid- and far-infrared stealth performance were selected， and the engine compartment of a Jeep was taken as the object of study to analyze the effects of self-radiation and radiation from the reflected environment on the stealth effect. A photonic crystal film with mid- and far-infrared stealth effects was designed and fabricated， and then the effects of the films on the stealth effect of the engine compartment were tested during daytime and nighttime， respectively. The results show that solar radiation has less influence on the mid- and far-infrared stealth effect of photonic crystal films， and that photonic crystal films can better achieve object and background fusion. The work demonstrates that photonic crystals are better than low emissivity films in mid- and far-infrared stealth. In order to study the infrared stealth effect of photonic crystal films in practical application scenarios， photonic crystal films and low emissivity films with mid- and far-infrared stealth performance were selected， and the engine compartment of a Jeep was taken as the object of study to analyze the effects of self-radiation and radiation from the reflected environment on the stealth effect. A photonic crystal film with mid- and far-infrared stealth effects was designed and fabricated， and then the effects of the films on the stealth effect of the engine compartment were tested during daytime and nighttime， respectively. The results show that solar radiation has less influence on the mid- and far-infrared stealth effect of photonic crystal films， and that photonic crystal films can better achieve object and background fusion. The work demonstrates that photonic crystals are better than low emissivity films in mid- and far-infrared stealth.
Acta Photonica Sinica
- Publication Date: Jan. 25, 2021
- Vol. 50, Issue 1, 59 (2021)
Progress on Electronic Structure Control and Application of Two Dimensional Photocatalytic Materials （Invited）
Wenlin ZHANG, Chunhua XU, Mengfei SUN, Yulong WANG, Ran LI, Yuqi ZHANG, and Jijiang WANG
Firstly， the electronic structure control methods of photocatalysts based on two dimensional （2D） materials are briefly reviewed， including thickness control， element doping， defect engineering and heterojunction design， etc. Secondly， it is mainly introduced that the research progress of heterogeneous junctions composed of 2D materials and other semiconductor interfaces with different dimensions due to the unique advantages of heterogeneous junctions in reducing the rate of photoelectron hole recombination. Then the applications of new 2D photocatalytic materials in hydrogen evolution， CO2 reduction， nitrogen fixation and pollutant degradation are introduced. It is shown that， compared with bulk materials， 2D materials have higher specific surface area， a large number of active sites on the surface， more effective separation of carriers in the catalyst， appropriate energy band structure， and adjustable light absorption zone， etc. At last the current research status and challenges are briefly summarized， and the prospect of application of 2D materials in photocatalysis is prospected . Firstly， the electronic structure control methods of photocatalysts based on two dimensional （2D） materials are briefly reviewed， including thickness control， element doping， defect engineering and heterojunction design， etc. Secondly， it is mainly introduced that the research progress of heterogeneous junctions composed of 2D materials and other semiconductor interfaces with different dimensions due to the unique advantages of heterogeneous junctions in reducing the rate of photoelectron hole recombination. Then the applications of new 2D photocatalytic materials in hydrogen evolution， CO2 reduction， nitrogen fixation and pollutant degradation are introduced. It is shown that， compared with bulk materials， 2D materials have higher specific surface area， a large number of active sites on the surface， more effective separation of carriers in the catalyst， appropriate energy band structure， and adjustable light absorption zone， etc. At last the current research status and challenges are briefly summarized， and the prospect of application of 2D materials in photocatalysis is prospected .
Acta Photonica Sinica
- Publication Date: Jan. 25, 2021
- Vol. 50, Issue 1, 45 (2021)
Research Progress of the Stability and Photodetectors Applications of Organic-inorganic Hybrid Halide Perovskite Materials （Invited）
Lijuan YAO, Xuan FANG, Dan FANG, Chenhao GAO, Shengda LIU, Ruxue LI, Dengkui WANG, Zhipeng WEI, and Xiaohua WANG
Organic inorganic hybrid perovskite material （CH3NH3PbX3） has been widely used in solar cells， photodetectors， light-emitting diodes and lasers due to its excellent photoelectric properties， such as high carrier mobility， direct band gap coefficient and high photoelectric conversion efficiency. However， the stability of organic-inorganic hybrid perovskite materials is a difficult problem for its practical application. In this paper， we discuss the influence of external environmental factors （water and oxygen， temperature， light， etc.） on the stability of organic-inorganic hybrid perovskite materials systemically. And the main research approaches to improve and enhance the stability of perovskite materials at this stage are summarized， such as improving synthesis methods， ion doping， device packaging and other means， and also the effect on the performance of photodetector. Finally， the challenges and development strategies of the neighborhood are proposed. Organic inorganic hybrid perovskite material （CH3NH3PbX3） has been widely used in solar cells， photodetectors， light-emitting diodes and lasers due to its excellent photoelectric properties， such as high carrier mobility， direct band gap coefficient and high photoelectric conversion efficiency. However， the stability of organic-inorganic hybrid perovskite materials is a difficult problem for its practical application. In this paper， we discuss the influence of external environmental factors （water and oxygen， temperature， light， etc.） on the stability of organic-inorganic hybrid perovskite materials systemically. And the main research approaches to improve and enhance the stability of perovskite materials at this stage are summarized， such as improving synthesis methods， ion doping， device packaging and other means， and also the effect on the performance of photodetector. Finally， the challenges and development strategies of the neighborhood are proposed.
Acta Photonica Sinica
- Publication Date: Jan. 25, 2021
- Vol. 50, Issue 1, 26 (2021)
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