Results 71 to 80 of about 13,698 (193)

Bifunctional Competitive Structure of Biomass Carbon‐Derived Metacomposites for Tunable ε′‐Near‐Zero and ε′‐Negative Responses

open access: yesRare Metals, EarlyView.
ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang   +4 more
wiley   +1 more source

Controllable fabrication and optical properties of Si and tree-like Si/ZnO nanowire arrays [PDF]

open access: yes, 2015
硅作为一种重要的半导体材料,在微电子器件以及太阳能电池中有着广泛的 应用。近年来一维纳米材料成为人们的研究热点,其中一维硅纳米材料由于有着 优越的光学性能、电学性能以及与硅微电子器件及工艺的兼容性,引起了极大的 关注。相比一维纳米材料,树枝状的纳米材料有着更大的表面积,尤其是不同功 能材料组成的异质结纳米线阵列有着更优良的性能。研究发现枝状Si/ZnO纳米 线异质结阵列能增加光的吸收以及促进电荷分离,在太阳能转化和能量储存装置 中有很大应用潜力。本文着手于Si及树状Si/ZnO纳米线阵列的可控制备及光 ...
杨倩倩
core  

Electrolyte With Functionalized Boron Nitride Nanosheets for Dendrite‐Free Lithium Metal Anodes

open access: yesRare Metals, EarlyView.
ABSTRACT Lithium metal batteries (LMBs) are regarded as promising candidates for the next‐generation high‐energy‐density storage systems due to their unparalleled theoretical energy density and low redox potential. However, the commercialization of LMBs is tremendously plagued by the barbaric growth of lithium dendrite and the intricate decomposition ...
Ji Zhou   +5 more
wiley   +1 more source

The Influence of Metallurgy process on Impurity Distribution and Electrical Properties of UMG-Si [PDF]

open access: yes, 2013
硅是太阳电池的主要原料,其杂质的含量和分布直接影响太阳电池的发电效率和使用寿命。研究冶金工艺对高纯硅中杂质分布及电学性能的影响具有重要的意义。 本文以两种不同的冶金工艺对工业硅进行预处理,最后通过真空定向凝固制备多晶硅锭,分析和研究两铸锭的宏观形貌、微观结构特征,探讨两铸锭中主要杂质元素的分布规律,通过计算铸锭不同高度理论值和实测值来分析杂质去除机制,最后结合电学性能测试来讨论杂质和晶体学缺陷对铸锭电阻率、导电类型、少子寿命的影响。主要研究结果如下: 1、采用两种不同工艺(A:真空-造渣-酸洗、B:造渣-
余德钦
core  

Electronegativity‐Driven Frontier Orbital Engineering in B‐Ti Diatomic Synergy Enables Selective Li2C2O4 Conversion in Li‐CO2 Batteries

open access: yesRare Metals, EarlyView.
ABSTRACT As a promising alternative to sluggish Li2CO3‐based Li‐CO2 electrochemistry, Li2C2O4 offers a favorable 2e− discharge pathway, yet its selective formation and reversible decomposition remain debated. Herein, we propose a nonmetal‐metal synergistic catalyst—B‐Ti coregulated layered transition metal boride Ti18B18O9/graphene (B‐Ti/TiBOG)—to ...
Qiong Peng   +8 more
wiley   +1 more source

The study of chemical vapor deposition graphene growth mechanism based on isotope labelling technique [PDF]

open access: yes, 2016
石墨烯是一种只由单个碳原子层构成的理想二维材料,自2004年首次被Novoselov等人采用胶带法从高定向热解石墨表面剥离出来后,其高电子迁移率,高热导,高硬度,高透光率等一系列独特优异的物理化学性质就不断被揭示,近十几年来一直保持着其研究热点的领先地位,同时还带动了其他二维层状材料的研究热潮。 目前石墨烯主要的制备方法分为以下四类:机械剥离法、氧化还原法、碳化硅外延法和化学气相沉积法;其中化学气相沉积法在生长高质量大面积石墨烯方面表现出很大的优势,尤其是在铜衬底上已获得30英寸的大尺寸单层石墨烯 ...
黎琼钰
core  

Systematic Study of Fermi‐Level Pinning at Crystalline Metal/GaN Interfaces: First‐Principles Calculations and Diode Characterization

open access: yesRare Metals, EarlyView.
ABSTRACT The Schottky barrier height (SBH), which serves as a pivotal determinant of charge carrier injection efficiency in electronic devices, critically governs electrical behavior at metal/semiconductor interfaces. However, pronounced metal‐induced gap states at metal contact interfaces induce Fermi‐level pinning, which constrains the ...
Xiaofei Liu   +10 more
wiley   +1 more source

Production of graphene nanosheets by supercritical CO2 technology coupled with mechanical exfoliation [PDF]

open access: yes, 2017
石墨烯因其优异的力学、热学、电学以及光学等性能,在电子器件、航天设备、生物传感器以及高性能复合材料等领域都有着巨大的应用前景,自2004年发现以来就引起了全世界科研工作者的密切关注。如何制备出高质量的单层或少层石墨烯成为当务之急。本论文提出了一种超临界二氧化碳技术结合机械剥离制备石墨烯的方法,获得了单层和少层的石墨烯,详细研究了操作参数对石墨烯产率的影响,确定了最优的制备条件,并通过表征手段对石墨烯进行了分析,探讨了整个制备过程的机理。 首先 ...
尚天宇
core  

Surface‐Embedded Ag@Multilayer Graphene for Photothermal‐Enhanced Superhydrophobic Anti‐Icing Coatings

open access: yesRare Metals, EarlyView.
ABSTRACT Harnessing solar energy for self‐heating presents an effective strategy to suppress surface ice formation. In this paper, we fabricated nano‐silver‐modified multilayer graphene sheets (Ag@MGs) that integrate photothermal and superhydrophobic properties for anti‐icing applications.
Yihan Zhang   +7 more
wiley   +1 more source

社会能源:从社会中获取能源

open access: yes智能科学与技术学报, 2019
能源的内在本质—— 物质性、社会性以及信息性解释了能源系统和社会系统之间不可避免的强烈的相互作用。讨论了能源的本质,并提出了社会能源系统在电力方面的概念和内涵。提出了一种基于 ACP 方法的用于构建和研究社会能源系统的一般方法,以美国某大学的校园电网作为算例进行了研究。最后,分别从社会科学和自然科学两方面讨论了社会能源的技术路线,并提出了对未来的展望。
张俊, 王飞跃, 方舟
doaj  

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