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主旨 第十五週碩博專討演講(12/20)
公告日期 2018-12-17
公告內容

碩博專題演講公告

題  目:  Geometric and electronic properties of graphene-related systems: Chemical bonding Schemes
主講者:林明發
現   職: 國立成功大學 物理系 教授

學   歷: 國立清華大學 物理系 博士

摘  要:

We present a systematic review on the feature-rich essential properties of graphene-related systems using the first-principles method.

The geometric and electronic properties are greatly diversified by the different numbers of layers, stacking configurations, sliding-created configuration transformations, rippled structures, and the distinct adatom adsorptions.

The top-site adsorptions can induce significantly buckled structures, especially by hydrogen and fluorine adatoms.

The electronic structures consist of the carbon-, adatom- and (carbon, adatom)-dominated energy bands.

There exist linear, parabolic, partially flat, sombrero-shaped and oscillatory bands, associated with various kinds of critical points.

The semi-metallic or semiconducting behavior of graphene systems are dramatically changed by multi- or single-orbital chemical bondings between carbons and adatoms.

Graphene oxides and hydrogenated graphenes possess tunable energy gaps.

Fluorinated graphenes might be semiconductors or hole-doped metals, while other halogenated systems certainly belong to the latter kind.

Alkali- and Al-doped graphenes exhibit the high-density free electrons in the preserved Dirac cones.

The ferromagnetic spin configuration is revealed for hydrogenated and halogenated graphenes under certain distributions.

Specifically, Bi nano-structures are formed by the interactions between monolayer graphene and buffer layers. Structure- and adatom-enriched essential properties are compared with the measured results, and potential applications are also discussed.

時  間:民國 107 年 12 月 20 日 下午 3:10

地  點:成功大學成功校區測量系一樓經緯廳

 

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最後修改時間 2018-12-17 11:17:29