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Hollow Multi-shelled Structure Photoelectric Materials: Multiple Shells Bring Novel Properties

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Chemical Research in Chinese Universities 2024年第3期40卷 413-427页

作者： SU Fengmei WAN Jiawei WANG Dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese AcademyofSciencesBeijing 100049P.R.China

Hollow multi-shelled structures(HoMSs)have made significant strides across a wide spectrum of scientific investigations since the inception of the sequential templating approach(STA)in 2009,revealing distinctive temporal-spatial ordering *** recent establishment of a mathematical model for STA has not only demystified the formation of concentration waves within the STA process but also extended its relevance to gentler solutionbased systems,thereby broadening the HoMs ***,focusing on photoelectric applications,this review first summarizes the unique temporal-spatial ordering features of ***,the greatly enhanced properties of light capture and absorption,exciton separation,and transfer are deeply ***,we conclude with a perspective on the potential challenges and burgeoning opportunities that lie ahead in the advancement of HoMs development.

关键词： Hollow multi-shelled structure Photoelectric conversion Sequential templating approach light absorption Chargetransfer

Calculation of Spectral absorption Coefficient of High Temperature Equilibrium or Non-equilibrium 11-Species Air

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Chinese Journal of Aeronautics 2001年第3期14卷 140-146页

作者：董士奎谈和平贺志宏余其铮 Sch. of Energy Sci. and Engineering Harbin Institute of Technology Harbin 150001 China

As a reentry vehicle traveling through atmosphere with a very high Mach number, the ultraviolet, visible light and infrared signatures, produced from its head shock-wave layer and wake, are the foundation of detecting and identifying for the ground monitoring and the antimissile controlling and guiding system. At the same time, the gas layer radiation is also an important source of heating flux to the wall. The absorption coefficients of high temperature gas in the head shock-wave layer are basic parameters for calculations of the target ultraviolet, visible light and infrared optical characteristics, the heat shield and the aerodynamic flow-field coupling with thermal radiation. In this paper, after the thermo-chemical non-equilibrium phenomenon of hypersonic rarefied flow during reentry stage is discussed, a three-temperature model (electronic temperature Te, vibrational temperature TV and rotational-transitional temperature TR) is used to characterize energy levels population of non-equilibrium air species in the shock-wave layer and the contribution of 11-species such as N2, N2+, N, N+, O2, O2+, O, O+, NO, NO+ and e- is directly calculated by using the atomic and molecular radiation theory. At last, a model is established, which calculates the absorption coefficient of high-temperature equilibrium or non-equilibrium air. The results are in good agreement with experimentally measured data in the visible region, but are slightly bad in the ultraviolet and infrared regions.

关键词： Aviation Hypersonic flow Infrared radiation light absorption Mathematical models Reentry Ultraviolet radiation

Study on third-order nonlinear optical properties of a soluble poly(p-phenylene vinylene) derivative

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Chinese Optics Letters 2005年第9期3卷 539-541页

作者：李宝铭吴洪才李晓奇易文辉 Institute of Photoelectric Technology and Solar Energy School of Electrical and Information EngineerXi'an Jiaotong University Xi'an 710049

A soluble poly（2-methoxy-5-decoxy）-p-phenylene vinylene （PMODOPV） was synthesized via dehydrochlorination reaction and characterized by UV-visible absorption spectrum. The results showed that PMODOPV had a broad optical absorption band in the range of 450--550 nm and the optical band gap was calculated to be around 2.12 eV. The third-order nonlinear optical susceptibilities （X^（3）） of PMODOPV films implanted by 30-keV N^＋ ions in the dose range of 3.8 × 10^15-9.6 × 10^16 ions/cm^2 were measured by degenerate four-wave mixing （DFWM） technique. The results demonstrated that the resonant and offresonant X^（3） values were all enhanced significantly by means of ion implantation. The maximum resonant X^（3） value of 9.67 × 10^-9 esu at 532 nm and off-resonant X^（3） value of 2.49 × 10^-10 esu at 1.064 μm were obtained when the ion dose was 3.8 × 10^16 ions/cm^2.

关键词： Characterization Derivatives light absorption Optical devices Optical properties Synthesis (chemical)

Pyrolysis of Rice Husk in a Fluidized Bed Reactor:Evaluate the Characteristics of Fractional Bio-Oil and Particulate Emission of Carbonaceous Aerosol(CA)

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Journal of Renewable Materials 2020年第3期8卷 329-346页

作者： Ning Li Weiming Yi Zhihe Li Lihong Wang Yongjun Li Xueyuan Bai Mei Jiang School of Agricultural Engineering and Food Science Shandong University of TechnologyZibo255000China Shandong Research Center of Engineering and Technology for Clean Energy Zibo255000China

Bio-oil production via pyrolysis is one of promising technologies for renewable energy production from ***,the complicated biooil is still a challenge for high-valued application and during biomass pyrolysis,the emission of non-cleaned aerosol,the potential emission,namely carbonaceous aerosol(CA)increased the difficulty of the commercial *** this study,Rice husk pyrolysis was performed in a semi-continuous fluidized bed reactor coupled with fractional *** effects of pyrolysis and condensation temperature on the properties of bio-oil and emission of CAwere investigated *** indicated that the in-situ separation of vapors was accomplished via condensers of different temperatures(85℃and−10℃).The bio-oil with different physiochemical properties were obtained in the high content of phenols and lower acids of BO1 and high content of acids and better *** size distribution of CA was found primarily classified as sub-micrometer grade particles,which have a diameter of less than 1.1μ*** particular,CA existed in three representative forms:bead,granular aggregate,and *** results of light absorption of total organic carbon(TOC)and non-volatile organic carbon(NVOC)indicated that the absorption per mass increased in the single temperature with the decrement of wavelength and it improved as the pyrolysis temperature increased at the specified *** absorption per mass was to maximum value(3.7 m^(2)/g)at 360 nm wavelength and 600℃.TOC demonstrated a strong light absorption and a wide spectral range dependence(AAE:5.08-10.05)which enhanced the light absorption in the ultra-violet and low-visible regions.

关键词： Rice husk pyrolysis bio-oil aerosol size distribution light absorption

Comparison of different side-pumping configurations for high power laser diode pumped solid-state laser

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Chinese Optics Letters 2003年第9期1卷 538-540页

作者：孟俊清陈卫标侯霞胡企铨 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800

Ray-tracing method is used to simulate the distribution of absorption in crystal rod for different side-pumping configuration. The distribution of pumping power and absorption efficiency is compared, and the numerical results are presented. The results show that the more uniform pumping and the higher absorption coefficient are obtained with a diffuse cavity. And the method of the slow axis of laser diode stack perpendicular to the axis of lasing gives the higher central pumping density.

关键词： light absorption Optical pumping Ray tracing

Effective strategies to promote Z(S)-scheme photocatalytic water splitting

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Chinese Chemical Letters 2024年第3期35卷 27-39页

作者： Ye Yuan Junan Pan Weinan Yin Haoxuan Yu Fengshun Wang Weifeng Hu Longlu Wang Dafeng Yan College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China College of Chemistry and Chemical Engineering Hubei UniversityWuhan 430062China

Artificial Z(S)-scheme photocatalytic water splitting systems have attracted extensive attention due to their advantages such as wide light absorption range,high charge separation efficiency and strong carrier redox ***,it is still challenging to design and prepare Z(S)-scheme photocatalysts with low-cost and highly stability for efficiently photocatalytic overall water splitting using solar *** review mainly introduces various strategies to improve the photocatalytic water splitting performance of Z(S)-scheme *** strategies mainly focus on enhancing or extending the range of light absorption,promoting charge separation,and enhancing surface redox reaction in Z(S)-scheme ***,the main challenges of Z(S)-scheme photocatalytic water splitting systems and their future development directions are pointed *** review would be beneficial to understanding the challenges and opportunities faced by the research field of Z(S)-scheme photocatalytic systems,and has important guiding significance for the development and utilization of high-performance Z(S)-scheme photocatalytic reaction system in the future.

关键词： Z(S)-scheme Overall water splitting light absorption Charge separation Loading co-catalyst

Highly efficient Nd:YAG ceramic CW laser with 59.8% slope-efficiency

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Chinese Optics Letters 2005年第2期3卷 89-91页

作者：漆云凤楼祺洪马海霞董景星 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800

In this paper, a highly efficient Ti：sapphire end-pumped 1 at.-% Nd：YAG ceramic laser that is comparable in efficiency with Nd：YAG single crystal lasers has been developed. Optical absorption and emission spectra for Nd：YAG ceramics have been measured. With 673-mW pumping, 295-mW laser output at 1064 nm has been obtained. The laser threshold is only 13 mW. Deducted the transmitted light, the corresponding optical-to-optical conversion efficiency is 58.4%. The lasing characteristics of Nd：YAG ceramic are nearly equal to those of Nd：YAG single crystal.

关键词： Ceramic materials Energy conversion light absorption light emission Sapphire Single crystals

Ultrathin zinc selenide nanosheet-based intercalation hybrid coupled with CdSe quantum dots showing enhanced photocatalytic CO_(2) reduction

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Chinese Chemical Letters 2021年第8期32卷 2474-2478页

作者： Zejun Zhao Zailun Liu Zhixiao Zhu Fang Wang Fei Teng Wenjun Jiang Yong Yang State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing 100094China School of Environmental Science and Engineering Nanjing University of Information Science&TechnologyNanjing 210044China

Fabrication of well-designed heterojunctions is an extraordinarily attractive pathway for boosting the photocatalytic activity toward CO_(2) ***,a novel kind of na nosheet-based intercalation hybrid coupled with CdSe quantum dots(QDs) was successfully fabricated by a facile solvothermal method and served as photocatalyst for full-spectrum-light-driven CO_(2) ***-small CdSe QDs were rationally in-situ introduced and coupled with lamellar ZnSe-intercalation hybrid nanosheet,resulting in the formation of CdSe ***/ZnSe hybrid ***,the concentration of Cd^(2+) could change directly the crystallinity and micromorphology of ZnSe intercalation hybrid,which in turn would impact on the photocatalysis *** optimized CdSe QDs/ZnSe hybrid-5 composite demonstrated a considerable CO yield rate of the 25.6 μmol g^(-1) h^(-1) without any additional cocatalysts or sacrificial agents assisting,making it one of the best reported performance toward CO_(2) photoreduction under full-spectrum *** elevated CO_(2) photoreduction activity could be attributed to the special surface heterojunction,leading to improving the ability of light absorption and promoting the separation/transfer of photogenerated *** present study developed a new strategy for designing inorganic-organic heterojunctions with enhanced photocatalyst for CO_(2) photoreduction and provided an available way to simultaneously mitigate the greenhouse effect and alleviate energy shortage pressure.

关键词： Inorganic-organic hybrid ZnSe intercalation hybrid CdSe quantum dots light absorption Photocatalytic CO_(2)reduction

Study of intensity-dependent nonlinear optical coefficients of GaP optical crystal at 800 nm by femtosecond pump-probe experiment

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Chinese Optics Letters 2006年第9期4卷 536-538页

作者：桑海宇李鸣余向阳周建英 National Laboratory for Superlattices and microstructures Institute of Semiconductors Chinese Academy of Sciences State Key Laboratory of Optoelectronic Materials and Technology Sun Yat-Sen University

The intensity-dependent two-photon absorption and nonlinear refraction coefficients of GaP optical crystal at 800 nm were measured with time-resolved femtosecond pump-probe technique. A nonlinear refraction coefficient of 1.7×10^-17 m^2/W and a two-photon absorption coefficient of 1.5×10^-12 m/W of GaP crystal were obtained at a pump intensity of 3.5 × 10^12 W/m^2. The nonlinear refraction coefficient saturates at 3.5 × 10^12 W/m^2, while the two-photon absorption coefficient keeps linear increase at 6 × 10^12 W/m^2. Furthermore, fifth-order nonlinear refraction of the GaP optical crystal was revealed to occur above pump intensity of 3.5 × 10^12 W/m^2.

关键词： Crystals light absorption Nonlinear optics Photons Refraction