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Impact of nanocrystallinity segregation on the growth and morphology of nanocrystal superlattices

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Nano Research 2013年第8期6卷 611-618页

作者： yanfen wan Herve Portals Nicolas Goubet Alain Mermet Marie-Paule Pileni Université Pierre et Marie Curie Paris 6 UMR 7070 LM2N 8P 52 4 place Jussieu 75005 Paris France Centre National de la Recherche Scientifique Unitd Mixte de Recherche 7070 LM2N 4 place Jussieu 75005 Paris France Université Lyon I Institut Lumiére Matiére Unité Mixte de Recherche 5306 CNRS Bāt. A. Kastler 10 rueAda Byron 69622 Villeurbanne France

A colloidal solution of 5 nm Au tetradecanethiol-coated nanoparticles is syn-thesized. After fast evaporation of one drop, ordered monolayers both composed of single domain and polycrystalline nanocrystals are obtained. On increasing the amount of materials and the evaporation time, nanocrystal films with irregular outlines are produced together with close-packed 3D superlattices exhibiting a truncated-tetrahedral shape. Using low-frequency micro-Raman scattering spectroscopy and electron microscopy the building block nanocrystallinity is characterized. Spontaneous nanocrystallinity segregation is revealed： the truncated-tetrahedral supracrystals are shown to mainly contain single domain building blocks while the supracrystalline films are composed of a mixture of single domain and polycrystalline nanocrystals. This observation points out the correlation between the nanocrystallinity segregation involved in the growth of the nanocrystal superlattices and their morphology.

关键词： supracrystals close-packed self-assembly metal nanoparticles Raman scatteringspectroscopy

Multi-3D hierarchical biomass-based carbon particles absorber for solar desalination and thermoelectric power generator

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Journal of Materials Science & Technology 2020年第24期59卷 180-188页

作者： Hao Jiang Xuemin Geng Simin Li Hongyu Tu Jiliang wang Lixia Bao Peng Yang yanfen wan School of Materials and Energy Key Laboratory of LCR Materials and Devices of Yunnan ProvinceYunnan UniversityKunming 650091China School of Chemical Science and Technology Yunnan UniversityKunming 650091China

To meet challenges of the global energy crisis and the freshwater resources shortage,the interfacial solarto-steam conversion(ISSC)system was developed quickly in recent *** photothermal materials play an important role in the ISSC *** are devoted to developing a unique photothermal material integrating multiple 3 D design philosophy both at macroscopic and microscopic levels by employing the cost-effective and widespread resources like straw,rose and coffee grounds,for carbonization as solar *** biomass-based carbonized particles(CPs)possess three major advantages:(1)wide sizedistribution is accessible to form 3 D porous rough surface of absorber layer to enhance ability of light absorption;(2)the pristine hierarchical microstructure could absorb nearly all the incident light;(3)the intrinsic vascular bundles with pores on their lumen walls provide a rapid and omnidirectional transport for water and steam escape.A high-efficient solar steam device was fabricated based on the absorber material with its internal 3 D micro textures and external 3 D *** the illumination of 1 sun,the photothermal conversion efficiency of straw,rose and coffee CPs can reach 93.4%,92.8% and 76%,***,a high-efficient solar thermoelectric generator(STEG)is made by coating CPs on a commercial thermoelectric generator and the maximum power of STEG can reach 538.0μ*** scalable biomass-based photothermal materials and high-grade thermoelectric conversion capability could be applied to the water purification and the electricity production.

关键词： Interfacial solar-to-steam conversion Biomass carbon particles 3D porous absorber Omnidirectional water transport Steam escape

Multistage Microstructured Ionic Skin for Real-Time Vital Signs Monitoring and Human-Machine Interaction

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Energy & Environmental Materials 2024年第6期7卷 218-229页

作者： Xueke wang Jinyu Zi Yi Chen Qiang Wu Zhimin Xiang Yongqiang Tu Peng Yang yanfen wan National Center for International Research on Photoelectric and Energy Materials Yunnan Key Laboratory for Micro/Nano Materials&TechnologyYunnan Key Laboratory of Electromagnetic Materials and DevicesSchool of Materials and EnergyYunnan UniversityKunming 650091China

Skin-like electronics research aiming to mimic even surpass human-like specific tactile cognition by operating perception-to-cognition-to-feedback of stimulus to build intelligent cognition systems for certain imperceptible or inappreciable signals was so ***,we constructed an all-in-one tri-modal pressure sensing wearable device to address the issue of power supply by integrating multistage microstructured ionic skin(MM i-skin)and thermoelectric self-power staffs,which exhibits high sensitivity *** MM i-skin with multi-stage“interlocked”configurations achieved precise recognition of subtle signals,where the sensitivity reached up to 3.95 kPa^(−1),as well as response time of 46 ms,cyclic stability(over 1500 cycles),a wide detection range of 0–200 ***,we developed the thermoelectricity nanogenerator,piezoelectricity nanogenerator,and piezocapacitive sensing as an integrated tri-modal pressure sensing,denoted as P-iskin,T-iskin,and C-iskin,*** multifunctional ionic skin enables real-time monitoring of weak body signals,rehab guidance,and robotic motion recognition,demonstrating potential for Internet of things(IoT)applications involving the artificial intelligence-motivated sapiential healthcare Internet(SHI)and widely distributed human-machine interaction(HMI).

关键词： bio-template method integrated device ionic skin skin-like microstructure tri-modal pressure sensing

Bimodal Coupling Haptic Perceptron for Accurate Contactless Gesture Perception and Material Identification

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Advanced Fiber Materials 2024年第6期6卷 1874-1886页

作者： Guomin Ye Qiang Wu Yi Chen Xueke wang Zhimin Xiang Jingyan Duan yanfen wan Peng Yang National Centre for International Research on Photoelectric and Energy Materials Yunnan Key Laboratory for Micro/Nano Materials and TechnologyYunnan Key Laboratory of Electromagnetic Materials and DevicesSchool of Materials and EnergyYunnan UniversityKunming 650091People’s Republic of China

A bimodal coupled multifunctional tactile perceptron for contactless gesture recognition and material identification is pro-posed to address the challenges posed by limited functionality,signal interference from multimodal collaborative work,and the high power consumption of traditional tactile *** perceptron integrates a capacitive sensor and a triboelectric sensor symmetrically,employing an energy complementarity strategy to reduce power consumption and implementing symmetrical distribution of two sensors for physical isolation to prevent signal *** capacitive sensor detects external pressure,providing information on material properties such as hardness,softness,and deformation,with a wide linear response range of 0-745.3 *** triboelectric sensor captures the electron affinity of measured ***,by utilising machine learning algorithms,a system for contactless gesture recognition and material identification is *** system demonstrates a remarkable accuracy rate of 98.5%when recognising 5 gestures,and achieves a perfect identi-fication(100%)of 10 different materials aided by incorporating capacitive and triboelectric *** results greatly advance the progress of tactile perceptrons with high integration,low power consumption,and multifunctionality,enhancing their effectiveness and reliability in smart device applications.

关键词： Haptic perceptron Capacitive and triboelectric mechanism Contactless gesture perception Material recognition

Antimicrobial power of biosynthesized Ag nanoparticles using refined Ginkgo biloba leaf extracts

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Frontiers of Materials Science 2022年第2期16卷 109-118页

作者： Wenbo ZHUANG Dafeng HU Xudong ZHANG Kai XIONG Xiao DING Jian LU Yong MAO Peng YANG Chao LIU yanfen wan National Center for International Research on Photoelectric and Energy Materials Advanced Computing CenterMaterials Genome InstituteSchool of Materials and EnergyYunnan UniversityKunming 650091China Kunming Institute of Botany Chinese Academy of SciencesKunming 650201China Department of Nuclear Medicine Yunnan Cancer Hospital&The Third Affiliated Hospital of Kunming Medical UniversityKunming 650118China

Silver nanoparticles(Ag NPs),relative to existing antibacterial agents,are more effective,less toxic and more economical,and have shown enormous potential for the nanomedicine *** this work,we report a‘green’method for the rapid and efficient synthesis of Ag NPs using Ginkgo biloba extracts as reducing agent and capping *** properties of Ag NPs against fungi and bacteria were *** results showed that the Ginkgo biloba extracts are crucial for the preparation of uniform and monodispersed Ag *** prepared Ag NPs exhibited remarkable antibacterial *** minimum inhibitory concentrations of Ag NPs for Escherichia coli and Pseudomonas aeruginosa were 0.044 and 0.088μg·mL−1,***,Ag NPs exhibited excellent bactericidal performance against MDR-Pseudomonas *** was found that the effect of the antibacterial activity of Ag NPs on Escherichia coli and Staphylococcus aureus was tightly related to the reactive oxygen species *** research provides guidelines for the efficient green synthesis of Ag NPs and its antibacterial applications.

关键词： Ginkgo biloba extract silver nanoparticle green synthesis antibacterial application

Simultaneous acquisition of Fe3O4 monocrystals:Tunable magnetic properties with various morphologies

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Progress in Natural Science:Materials International 2020年第1期30卷 41-46页

作者： Zemin Zheng Yiming Cao Zhe Li Huiyong Li Dafeng Hu Hao Jiang Xuemin Geng Jiangwei Lu Xudong Zhang Peng Yang yanfen wan School of Materials Science and Engineering Yunnan Key Laboratory for Micro/nano Materials & TechnologyYunnan University Center for Magnetic Materials and Devices & Key Laboratory for Advanced Functional and Low Dimensional Materials of Yunnan Higher Education Institute Qujing Normal University

Fe3O4nanoparticles（NPs） with a face-centered cubic（fcc） structure and two different morphologies（nanospheres and nanoprisms） were synthesized by a facile one-step *** synthesized Fe3O4nanospheres and nanoprisms were monocrystalline and separable in a magnetic *** different volume ratios of oleylamine（OAm） to dibenzyl ether,the sizes of the prepared Fe3O4NPs ranged from 5 to 21 *** OAm amount in the synthesis can significantly control the morphology of *** the OAm content increased from 10 ml to 30 ml,the faceted nanoprisms shrank while the nanospheres *** an OAm content of 25 ml,the nanoprisms diminished while more hexagonal and sphere-like particles appeared,implying a critical point of morphology transition from triangle to *** magnetic properties also depended on the NP morphology and *** prepared Fe3O4NPs are promising candidates in medical applications such as magnetic resonance imaging,targeted drug delivery,blood purification,and tumor hyperthermia.

关键词： Fe3O4 Nanoparticles Nanoprism Nanosphere Superparamagnetic

贵金属纳米颗粒-二维过渡金属硫化物复合纳米结构:制备技术与光电性能综述

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材料导报 2019年第3期33卷 426-432页

作者：吴治涌水世显张显杨鹏万艳芬西安电子科技大学先进材料与纳米科技学院云南大学材料科学与工程学院云南省微纳材料与技术重点实验室

过渡金属硫化物是由过渡金属元素和硫族元素构成,结构通式为MX2,其中M和X分别代表过渡金属和硫族元素。与石墨烯类似,过渡金属硫化物也是二维层状材料,层内由共价键键合形成六角网状结构,层间由范德华力相互作用堆积而成。然而,纯的石... 详细信息

过渡金属硫化物是由过渡金属元素和硫族元素构成,结构通式为MX2,其中M和X分别代表过渡金属和硫族元素。与石墨烯类似,过渡金属硫化物也是二维层状材料,层内由共价键键合形成六角网状结构,层间由范德华力相互作用堆积而成。然而,纯的石墨烯的零带隙限制了其在大多数电子和光电子上的应用。相反,已有研究表明,MoS2由块体材料厚度逐渐减小为单层材料时,其能带结构由间接带隙转变为直接带隙。同样,电子输运测试结果表明,二维过渡金属硫化物具有高的载流子迁移率、大的开关比等。但是二维过渡金属硫化物光吸收及光发射强度低,在很大程度上限制了该材料在光电领域的应用。为了突破二维过渡金属硫化物自身光吸收和光发射强度低的局限性,科研工作者将贵金属纳米颗粒独特的等离激元共振效应作为激发泵浦,增强二维过渡金属硫化物的光致发光效率,使贵金属纳米颗粒-二维过渡金属硫化物复合纳米结构展现出独特的光学性能和电学性能,为其在光学、生物、存储、电学以及催化等领域的应用开辟了新的道路。目前,对贵金属纳米颗粒-二维过渡金属硫化物复合纳米结构的研究,主要集中在利用贵金属纳米球、纳米棒、纳米岛、纳米盘、纳米天线、纳米核壳等结构对光进行汇聚,激发贵金属纳米结构中的表面等离激元,再将能量转移给二维过渡金属硫化物,进而在其中产生高强度的光吸收和光发射,对其光学特性产生明显的调制作用,并研究该复合纳米结构的光致发光和光生电流的增强特性。前期报道中主要采用电子束刻蚀、旋涂、浸润等方法来构筑复合纳米结构,但以上方法构筑的复合纳米结构中贵金属纳米颗粒沉积位置不可控,无序的纳米颗粒易在过渡金属硫化物的边缘和缺陷位置沉积,导致基面位置纳米颗粒厚度不均匀,这就在一定程度上限制了该复合纳米结构的应用。另外,当前关于贵金属纳米颗粒的形貌、尺寸、排列方式及间距等结构参数对复合纳米结构光电性能的影响的研究较少。本文综述了几种贵金属纳米颗粒-二维过渡金属硫化物复合纳米结构的构筑方法,并综合对比了不同构筑方法的利弊,评述了其光致发光和光生电流强度的改变,最后结合本课题组的研究工作展望了贵金属纳米颗粒-二维过渡金属硫化物复合纳米结构的发展前景。

关键词：贵金属纳米颗粒-二维过渡金属硫化物复合纳米结构等离激元共振效应光致发光光生电流

Multistage Microstructured Ionic Skin for Real-Time Vital Signs Monitoring and Human-Machine Interaction

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Energy & Environmental Materials 2024年第6期 222-233页

作者： Xueke wang Jinyu Zi Yi Chen Qiang Wu Zhimin Xiang Yongqiang Tu yanfen wan National Center for International Research on Photoelectric and Energy Materials Yunnan Key Laboratory for Micro/Nano Materials & Technology Yunnan Key Laboratory of Electromagnetic Materials and DevicesSchool of Materials and EnergyYunnan University

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临床护理带教中存在的问题及对策探析

科教文汇 2012年第28期 61-62页

作者：万艳芬南昌大学第一附属医院血液科江西南昌330006

临床护理带教是帮助护生步入实践工作的重要手段,也是帮助护生实施角色转换的重要环节。文章详细分析了临床护理带教中教师、护生、带教管理等方面存在的问题,并提出了相应的对策。

关键词：临床护理带教带教管理