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Engineering the inter-island plasmonic coupling in homometallic Au-Au_(n)core-satellite structures

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Nano Research 2023年第7期16卷 10690-10697页

作者： Xiaoying Wu Xiaoli Tian Zihe Jiang Yun Wang Tingting Jiang yuhua feng Zhenglong Zhang Hongyu Chen Institute of Advanced Synthesis School of Chemistry and Molecular EngineeringNanjing Tech UniversityNanjing 211816China School of Science Westlake UniversityHangzhou 310024China School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China

We show that through strong ligand mediated interfacial energy control between Au seeds and the deposited Au,the non-wetting growth of Au on Au seeds led to the formation homometallic core-satellite *** modulate the intraparticle plasmonic coupling between the core and the satellites,the number and size of the Au satellites,and their inter-island distances were continuously tuned by varying the growth *** a result of the precise structural control,the plasmonic absorptions of the core-satellite nanostructures were tuned from visible to near-infrared(NIR)spectral range,and the extent of spectral modulation(500-1300 nm)is among the best of the literature *** synthetic advance enriches the toolbox for nanosynthesis and points to a new direction in the exploration of sophisticated functional designs.

关键词： Au heterostructure core-satellite localized surface plasmon resonance(LSPRs) intraparticle coupling strong ligand near-infrared(NIR)absorptions

Turning weak into strong: on the CTAB-induced active surface growth

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Science China Chemistry 2022年第7期65卷 1299-1305页

作者： Yonglong Zheng Jianpeng Zong Ting Xiang Quan Ren Dongmeng Su yuhua feng Yawen Wang Hongyu Chen Institute of Advanced Synthesis(IAS) School of Chemistry and Molecular EngineeringJiangsu National Synergetic Innovation Centre for Advanced MaterialsNanjing Tech UniversityNanjing 211816China School of Science Westlake UniversityHangzhou 310023China

Discovering new methods and principles in the inequivalent growth of equivalent facets is of great significance for going beyond symmetrical nanocrystals and for out-of-box exploration. In this work, we demonstrate that a middle ground exists between the traditional weak ligands and the strong ligands with unusual growth modes. By modifying the seed concentration during the growth of pentagonal Au nanorods, the typical weak ligand cetyltrimethylammonium bromide(CTAB) is made strong, leading to notches of restricted growth and even the active surface growth mode. In-depth investigation in the link between growth kinetics and ligand packing reveals the principle of their interplay —— that the on-off dynamics of the ligands only allows for a certain limit of materials deposition rate. Beyond this limit, the growth materials build up and are then diverted elsewhere, leading to inequivalent growth. The fact that a freshly grown surface has few ligands promotes the active surface growth, focusing the growth materials onto a few sites. We believe that the knowhow of interfering ligand packing via growth kinetics would offer a powerful tool of synthetic control, where the facet-and curvature-dependent ligand packing is expected to be useful synthetic handles.

关键词： facet control ligand packing active surface growth Au deposition ligand dissociation

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Combining the Curvature and Ligand Effects for Regioselective Growth on Au Nano-bipyramids

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Precision Chemistry 2023年第2期1卷 94-99页

作者： Tingting Jiang Jianpeng Zong yuhua feng Hongyu Chen Institute of Advanced Synthesis School of Chemistry and Molecular EngineeringNanjing Tech UniversityNanjing 211816 Jiangsu ProvinceChina

We demonstrate the regioselective growth of Au on Au nanobipyramids,either with etching of the tips,uniform coating except the tips,or forming a single island on the axial tip or an island on the equatorial ***,the regioselectivity not only arises from the local curvature,as suggested by the recent literature,but also critically depends on the extent of ligand coverage on the seed *** is important to consider the competitive growth together with the curvature−ligand interplay:when there are insufficient ligands,they bind preferentially to the sharp tip for high surface energy,so that the remaining growth materials are diverted elsewhere;when the bipyramid is fully covered by ligands,the growth then selectively occurs at the tips because of the larger gaps among the ligands *** results demonstrate the great potentials in the rational design and synthesis when constructing sophisticated hybrid structures for functional nanomaterials.

关键词： Curvature effect Ligand effect Regioselective growth Seeded growth Ligand coverage

Versatile optical manipulation of trions,dark excitons and biexcitons through contrasting exciton-photon coupling

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Light(Science & Applications) 2023年第12期12卷 2802-2810页

作者： Zhe Li Xin-Yuan Zhang Rundong Ma Tong Fu Yan Zeng Chong Hu Yufeng Cheng Cheng Wang Yun Wang yuhua feng Takashi Taniguchi Kenji Watanabe Ti Wang Xiaoze Liu Hongxing Xu School of Physics and Technology Center for Nanoscience and Nanotechnologyand Key Laboratory of Artificial Micro-and Nanostructures of Ministry of EducationWuhan University430072 WuhanChina Wuhan University Shenzhen Research Institute 518057 ShenzhenChina Institute of Advanced Synthesis School of Chemistry and Molecular EngineeringNanjing Tech University211816 NanjingChina International Center for Materials Nanoarchitectonics National Institute for Materials Science1-1 Namiki305-0044 TsukubaJapan Research Center for Functional Materials National Institute for Materials Science1-1 Namiki305-0044 TsukubaJapan Wuhan Institute of Quantum Technology 430206 WuhanChina School of Microelectronics Wuhan University430072 WuhanChina Henan Academy of Sciences 450046 ZhengzhouChina

Various exciton species in transition metal dichalcogenides(TMDs),such as neutral excitons,trions(charged excitons),dark excitons,and biexcitons,have been individually discovered with distinct light-matter *** terms of valley-spin locked band structures and electron-hole configurations,these exciton species demonstrate flexible control of emission light with degrees of freedom(DOFs)such as intensity,polarization,frequency,and ***,it remains elusive to fully manipulate different exciton species on demand for practical photonic ***,we investigate the contrasting light-matter interactions to control multiple DOFs of emission light in a hybrid monolayer WSe2-Ag nanowire(NW)structure by taking advantage of various exciton *** excitons,including trions,dark excitons,and biexcitons,are found to couple independently with propagating surface plasmon polaritons(SPPs)of Ag NW in quite different ways,thanks to the orientations of transition *** with the simulations,the dark excitons and dark trions show extremely high coupling efficiency with SPPs,while the trions demonstrate directional chiral-coupling *** study presents a crucial step towards the ultimate goal of exploiting the comprehensive spectrum of TMD excitons for optical information processing and quantum optics.

关键词： dynamics coupling optics

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气候变暖的风险与对策

上海环境科学 2000年第6期19卷 272-275页

作者：冯裕华中国环境管理干部学院秦皇岛660000

全球气候变暖,给人类社会带来了巨大的风险。通过阐述气候变暖的源与汇,回顾并分析了前、后100年气候变暖的趋势及风险危害,在此基础上提出了气候变暖的风险对策。

关键词：温室气体气候变暖风险危害全球气候

The patchy growth mode:Modulation of the Au-Au interface via phenynyl ligands

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Science China Materials 2022年第6期65卷 1687-1695页

作者： Jianpeng Zong Quan Ren Xiaoli Tian Ting Xiang yuhua feng Hongyu Chen Institute of Advanced Synthesis(IAS) School of Chemistry and Molecular EngineeringJiangsu National Synergetic Innovation Centre for Advanced MaterialsNanjing Tech UniversityNanjing 211816China School of Science Westlake UniversityHangzhou 310023China Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China

Surface ligands play critical roles in nanosynthesis and thus it is of great importance in expanding the scope of suitable *** this work,we explore phenynyl ligands in modulating the Au-Au interface when growing Au domains on Au seeds.A patchy growth mode is observed where the emerging islands are flat-laying with holes and *** growth mode is distinctively different from the conventional facet-controlled growth using weak ligands,and the non-wetting island growth using strong *** manipulating the molecular structure and the packing of the phenynyl ligands on the Au seeds,the overgrown Au domains are continuously tuned,from patches to islands,extending the plasmon absorption peak into the near-infrared spectral *** believe that the new ligand with intermediate affinity and the unusual growth mode would expand the control in both synthesis and application.

关键词： phenynyls binding affinity Au patch ligand packing Au-Au hybrids

含湿量对蒸发式火焰稳定器贫油熄火性能的影响

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航空动力学报 2020年第9期35卷 1866-1874页

作者：冯玉桦刘玉英邓远灏黄义勇北京航空航天大学能源与动力工程学院北京100191 中国航空发动机集团有限公司四川燃气涡轮研究院成都610500

在来流温度为300~483 K、来流马赫数为0.14~0.3和含湿量为0~0.16的条件下,以蒸发式火焰稳定器研究对象,基于冷态流场数值模拟研究以及含湿量对燃烧负荷参数、燃烧反应、燃油雾化等的影响分析,提出了考虑含湿量的Lefebvre贫油熄火油气比... 详细信息

在来流温度为300~483 K、来流马赫数为0.14~0.3和含湿量为0~0.16的条件下,以蒸发式火焰稳定器研究对象,基于冷态流场数值模拟研究以及含湿量对燃烧负荷参数、燃烧反应、燃油雾化等的影响分析,提出了考虑含湿量的Lefebvre贫油熄火油气比修正方法,探讨了含湿量对蒸发式火焰稳定器贫油熄火性能的影响规律。研究结果表明:当含湿量增加时,蒸发式火焰稳定器的燃烧负荷参数增加,贫油熄火油气比显著增大,燃烧负荷参数不能完全表征贫油熄火油气比的变化,含湿量对燃油雾化的影响不容忽略。

关键词：含湿量蒸发式火焰稳定器贫油熄火燃烧负荷参数预测模型修正

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化学史在有机化学教学中的作用

通化师范学院学报 2001年第2期22卷 91-92页

作者：冯宇华通化师范学院化学系通化134002

本文就如何提高有机化学教学效果提出了运用化学史知识辅助教学的观点,并从四个方面分析阐述了化学史在教学中的具体应用及达到的效果。

关键词：有机化学教学化学史辅助教学教学方法教学手段学习兴趣

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基于Mapinfo的烟田管理信息系统建设

河南科技 2015年第18期34卷 27-29页

作者：冯宇华辽宁省第二水文地质工程地质大队辽宁大连116037

本文以阜新县烟田管理信息系统的建立为例,论述了基于Mapinfo的烟田管理信息系统的建设思路和实现方法,并利用已有的烟田图斑勾绘纸图,在Mapinfo下完成烟田数据库的建立。同时,在已有土地利用现状图的基础上,编程提取便于对烟田进行规... 详细信息

本文以阜新县烟田管理信息系统的建立为例,论述了基于Mapinfo的烟田管理信息系统的建设思路和实现方法,并利用已有的烟田图斑勾绘纸图,在Mapinfo下完成烟田数据库的建立。同时,在已有土地利用现状图的基础上,编程提取便于对烟田进行规划管理的辅助信息。最后利用Mapinfo的二次开发语言Mapbasic完成烟田管理信息系统功能的开发,实现对烟田各种查询、统计等功能。

关键词： GIS Mapinfo Mapbasic 烟田数据库