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A GQD-based composite film as photon down-converter in CNT/Si solar cells

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Nano Research 2021年第11期14卷 3893-3899页

作者： Xuewei Zhao yizeng wu Zhiyuan Xia Shulong Chang Yuanyuan Shang Anyuan Cao School of Materials Science and Engineering Peking UniversityBeijing100871China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou450001China

Graphene quantum dots (GQDs), have unique quantum confinement effects, tunable bandgap and luminescence property, with a wide range of potential applications such as optoelectronic and biomedical areas. However, GQDs usually have a strong tendency toward aggregation especially in making solid films, which will degrade their optoelectronic properties, for example, causing undesired fluorescence quenching. Here, we designed a composite film by embedding GQDs in a polyvinyl pyrrolidone (PVP) matrix through hydrogen bonding with well-preserved fluorescence, with a small addition of acid for compensating the poor conductivity of PVP. As a multifunctional solid coating on carbon nanotube/silicon (CNT/Si) solar cells, the photon down-conversion by GQDs and the PVP anti-reflection layer for visible light lead to enhanced external quantum efficiency (by 12.34% in the ultraviolet (UV) range) and cell efficiency (up to 14.94%). Such advanced optical managing enabled by low-cost, carbon-based quantum dots, as demonstrated in our results, can be applied to more versatile optoelectronic and photovoltaic devices based on perovskites, organic and other materials.

关键词： graphene quantum dots polyvinyl pyrrolidone energy-down-shift external quantum efficiency CNT/Si solar cells

High-performance Li-ion batteries based on graphene quantum dot wrapped carbon nanotube hybrid anodes

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Nano Research 2020年第4期13卷 1044-1052页

作者： Xuewei Zhao yizeng wu Yunsong Wang Huaisheng wu Yawei Yang Zhipeng Wang Linxiu Dai Yuanyuan Shang Anyuan Cao Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China

Since Akira Yoshino first proposed the usage of the carbonaceous materials as an anode of lithium ion batteries(LIBs)in 1985,carbonaceous materials such as graphite and graphene have been widely considered as LIB ***,we explored the application of novel carbonaceous UB anodes incorporating graphene quantum dots(GQDs).We fabricated a freestanding all-carbon electrode based on a porous carbon nanotube(CNT)sponge via a facile in-situ hydrothermal deposition technique,creating coaxial structure of GQD-coated CNTs(GQD@CNTs)through electrostatic interaction and n-n stacking with tunable loading and *** hybrid structure combined conductive CNTs with highly active GQDs,in which GQDs with predesigned functional groups provided massive storage sites for Li ions and the 3D CNT frameworks avoided the agglomeration of GQDs,together contributing to a high specific capacity(700 mAh·g^-1 at 100 mA·g^-1 after 100 cycles)and rate *** at a high current density of 1,000 mA·g^-1,the reversible specific capacity remained at 483 mAh g-1 after 350 *** particular,the mechanism study demonstrated the important role of oxygen functional groups of GQDs in promoting the performance of the LIB anodes by controlled grafting of GQDs onto various porous-carbon and metal-foam based structures.

关键词： graphene quantum dots carbon nanotubes lithium ion batteries anodes oxygen functional groups

High-efficiency CNT-Si solar cells based on a collaborative system enabled by oxide penetration

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Nano Research 2022年第3期15卷 2497-2504页

作者： Xuewei Zhao Wenjing Xu yizeng wu Huaisheng wu Zhiyuan Xia Huiyi Xu Yuanyuan Shang Jinquan Wei Anyuan Cao School of Materials Science and Engineering Peking UniversityBeijing 100871China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Carbon nanotube-silicon(CNT-Si)solar cells represent one of the alternative photovoltaic techniques with potential for low cost and high ***,we report a method to improve solar cell performance by depositing conventional transitional metal oxides such as WO_(3)and establishing a collaborative system,in which CNTs are well-embedded within the WO_(3)layer and both of them are in close contact to Si *** unique collaborative system optimizes the overall energy conversion process including the light absorption(antireflection by WO_(3)),carrier separation(forming quasi p-n junction)and charge collection(CNT conductive network throughout the oxide layer).Combining with our previous TiO_(2)-coating and HNO_(3)-doping techniques,a solar cell efficiency of>18%at an active area of 0.09 cm 2(air mass 1.5,100 mW/cm^(2))was *** oxide-enhanced CNT-Si solar cells which integrate the advantages of traditional semiconductors and novel nanostructures represent a promising route toward next-generation high-performance silicon-based photovoltaics.

关键词： carbon nanotube-silicon(CNT-Si)solar cell high-efficiency WO_(3) collaborative system

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萃华楼(英文)

China's Foreign Trade 2004年第6期 43-45页

作者： Yi Yan Ma Long Sun yizeng, wu Yan

1. The guests from all over the world to Beijing should not leave without visiting tile famous golden street-Wangfujing Street; along which from the south to the north, you can go shopping and look around all the way. On the northeast of Wangfujing Street, there is a Roman Catholic Church with steeple called the East Church, built in 1655. Next to the East Church is the famous restaurant in Beijing---Cuihualou Restaurant. If you are hungry now, just go and enjoy the meals there.2. At the mention of the history of Cuihualou Restaurant, there is a story. In those years the Dongxinglou Restaurant was one of the "Eight Great Restaurants" of Beijing. When An Shutang, the general manager of Dongxinglou Restaurant died, he passed the restaurant to the succeeding manager, An Yaodong. After An Yaodong took over the restaurant, he dawdled everyday. Capable persons could not find a foothold there, so they did not care about the business. Then the restaurant soon declined within three years.

关键词：华楼 shop over than

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萃华楼(英文)

China's Foreign Trade 2004年第8期 58-60页

作者： Yi Yan and Ma Long, by Sun yizeng, by wu Yan

1. The guests from all over the world to Beijing should not leave withoutvisiting the famous golden street-Wangfujing Street; along which from thesouth to the north, you can go shopping and look around all the way. On the northeast of Wangfujing Street, there is a Roman Catholic Church with steeplecalled the East Church, built in 1655. Next to the East Church is thefamous restaurant in Beijing---Cuihualou Restaurant. If you are hungrynow, just go and enjoy the meals there.

关键词：华楼 over

Aspects of recent developments in analytical chemometrics

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Science China Chemistry 2006年第3期49卷 193-203页

作者： LIANG yizeng1,2, wu Hailong1, SHEN Guoli1, JIANG Jianhui1, LIANG Sheng2 & YU Ruqin1 1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China 2. Research Center of Modernization of Traditional Chinese Medicines, Central South University, Changsha 410081, China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha China Research Center of Modernization of Traditional Chinese Medicines Central South University Changsha China

Some aspects of recent developments in analytical chemometrics are discussed, in par- ticular the developments viewed from the angle of the research efforts undertaken in authors’ labora- tories. The topics concerned include resolution of high-order chemical data, morphological theory and methodology for chemical signal processing, multivariate calibration and chemical pattern recognition for solving complex chemical problems, and resolution of two-way chemical data from hyphenated chromatographic instruments.

关键词： chemometrics, high-order chemical data, pattern recognition, multivariate calibration and resolution.

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色谱指纹图谱与中药质量控制

色谱 2008年第2期26卷 166-171页

作者：易伦朝吴海梁逸曾中南大学化学化工学院中药现代化研究中心湖南长沙410083

本文综述了近年来色谱指纹图谱研究中多种色谱技术、相关化学计量学方法的发展及其在中药质量控制中的应用,并对中药质量稳定性和有效性的全面评价方法和可行性进行了初步探讨。提出以色谱指纹图谱为核心,依托现代色谱技术、化学计量学... 详细信息

本文综述了近年来色谱指纹图谱研究中多种色谱技术、相关化学计量学方法的发展及其在中药质量控制中的应用,并对中药质量稳定性和有效性的全面评价方法和可行性进行了初步探讨。提出以色谱指纹图谱为核心,依托现代色谱技术、化学计量学和系统生物学方法,建立中药化学成分信息与药效(毒性)信息相关关系的中药质量控制研究策略,深层次揭示中药的内在作用机理,期望真正实现中药质量的可控、安全和有效。

关键词：中药质量控制色谱指纹图谱化学计量学系统生物学

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Clusterihg analysis and the calculation of risk index of transmission sites of schistosomiasts japonica in marshland and lake region of Hunan Province.

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中国寄生虫学与寄生虫病杂志 1988年第S1期 176-177页

作者： wu Zhaowu, Liang yizeng, Wang Kemin. Dong Youfang, Wen Shulin: Hunan Provincial Institute of Parasitic Diseases, et al.

Data of 72 blocks of transmission sites of schistosomiasis from 15 counties or farms in marshlandand lake region were analyzed in terms of the hierarchical clustering method by using IBM-PC/XTcomputer and a simple mat... 详细信息

关键词： Clusterihg analysis and the calculation of risk index of transmission sites of schistosomiasts japonica in marshland and lake region of Hunan Province

分别用鲜草与干草生产的鱼腥草注射液指纹图谱对比研究

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分析化学 2006年第6期34卷 813-816页

作者：卢红梅梁逸曾伍贤进易伦朝陈硕中南大学化学化工学院湖南怀化学院生物系

采用GC-MS分析了21个厂家的鱼腥草注射液指纹图谱。结果发现,采用干草和鲜草生产的注射液的指纹图谱之间存在一定的差异。在药材干燥过程中发现,药材挥发油的含量及主要化合物的含量随干燥时间的变化与鱼腥草注射液的研究结果非常一致,... 详细信息

采用GC-MS分析了21个厂家的鱼腥草注射液指纹图谱。结果发现,采用干草和鲜草生产的注射液的指纹图谱之间存在一定的差异。在药材干燥过程中发现,药材挥发油的含量及主要化合物的含量随干燥时间的变化与鱼腥草注射液的研究结果非常一致,结果说明鲜草注射液与干草注射液指纹图谱之间的差别主要是由于原药材的干燥程度所引起。在鱼腥草注射液指纹图谱标准制定中应该考虑到两类药材的影响。

关键词：鱼腥草注射液指纹图谱色谱-质谱