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海天天意

铁杆木虫 (正式写手)

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注册: 2011-07-19
专业: 电化学

[交流] Acc. Chem. Res.1.02新鲜在线大牛崔毅二维层状硫化物已有2人参与

Two-Dimensional Layered Chalcogenides: From Rational Synthesis to Property Control via Orbital Occupation and Electron Filling
Published as part of the Accounts of Chemical Research special issue “2D Nanomaterials beyond Graphene”.
Hongtao Yuan,†,‡ Haotian Wang,§ and Yi Cui*,†,‡,∥
（10页 54篇文献，全文介绍请看摘要哈）
二维硫化物（比如：MoS2）是目前研究的热点领域之一。各种制备方法以及应用领域都在不断拓展。本文重点报道了：CUIYI团队从理论的角度在二维硫化物合理设计、化学、电化学以及物理化学性质的电动调节通过修饰电子的占有情况.......的一些工作，值得学习。
ABSTRACT: Electron occupation of orbitals in two-dimensional (2D) layered materials controls the magnitude and anisotropy of the interatomic
electron transfer and exerts a key influence on the chemical bonding modes of 2D layered lattices. Therefore, their orbital occupations
are believed to be responsible for massive variations of the physical and chemical properties from electrocatalysis and energy storage,
to charge density waves, superconductivity, spin−orbit coupling, and valleytronics. Especially in nanoscale structures such as nanoribbons,
nanoplates, and nanoflakes, 2D layered materials provide opportunities to exploit new quantum phenomena.
In this Account, we report our recent progress in the rational design and chemical, electrochemical, and electrical modulations of the physical
and chemical properties of layered nanomaterials via modification of the electron occupation in their electronic structures. Here, we start with
the growth and fabrication of a group of layered chalcogenides with varied orbital occupation (from 4d/5d electron configuration to 5p/6p
electron configuration). The growth techniques include bottom-up methods, such as vapor−liquid−solid growth and vapor−solid growth,
and top-down methods, such as mechanical exfoliation with tape and AFM tip scanning.
Next, we demonstrate the experimental strategies for the tuning of the chemical potential (orbital occupation tuned with electron
filling) and the resulting modulation of the electronic states of layered materials, such as electric-double-layer gating, electrochemical
intercalation, and chemical intercalation with molecule and zerovalence metal species. Since the properties of layered
chalcogenides are normally dominated by the specific band structure around which the chemical potential is sitting, their desired
electronic states and properties can be modulated in a large range, showing unique phenomena including quantum electronic
transport and extraordinary optical transmittance.
As the most important part of this Account, we further demonstrate some representative examples for the tuning of catalytic,
optical, electronic, and spintronic properties of 2D layered chalcogenides, where one can see not only edge-state induced
enhancement of catalysis, quantum Aharonov−Bohm interference of the topological surface states, intercalation modulated
extraordinary transmittance, and surface plasmonics but also external gating induced superconductivity and spin-coupled valley
photocurrent. Since our findings reflect the critical influences of the electron filling of orbital occupation to the properties in 2D
layered chalcogenides, we thus last highlight the importance and the prospective of orbital occupation in 2D layered materials for
further exploring potential functionalized applications.

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[ Last edited by 海天天意 on 2015-1-4 at 14:09 ]

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2015-01-02 23:17:16, 821.05 K

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