コーブ型グラフェンナノリボン合成のためのステップ成長無効型π拡張ポリメリゼーション
Yuuta Yano1, Feijiu Wang1,2, Nobuhiko Mitoma1,2
1Graduate School of Science , Nagoya University , Chikusa , Nagoya 464-8602 , Japan.
Journal of the American Chemical Society
|January 11, 2020
まとめ
この研究では,精密構造のグラフェンナノリボン (GNR) の合成のための新しいポリメリゼーション法が導入されています. この進歩により,次世代の炭素材料と 均一な表面組立が制御できます
科学分野:
- 材料科学
- 有機化学
- ナノテクノロジー
背景:
- グラフェンナノリボン (GNR) は高度な応用のための有望な炭素材料です.
- GNRの構造を正確に制御することは,その物理的性質を調整するために極めて重要です.
- 既存の合成方法はしばしばモジュール化と構造的な定義が欠けている.
研究 の 目的:
- 構造的に明確に定義されたコーブ型GNRの迅速かつモジュラーな合成を開発する.
- これらの合成されたGNRの構造-特性関係を調査する.
- GNRの表面での均一な自己組み立てを実現する.
主な方法:
- ステップ・グロース・アヌラティブ・π拡張ポリメリゼーション
- ピレンおよび/またはコロネン二ミド単位によるコーブ型GNRの合成
- 構造と光物理学的特徴を分析するスペクトル分析.
- ガス吹き補助で表面に自己組み立て.
主要な成果:
- コーブ型GNRの迅速かつモジュール式合成が成功しました.
- 合成されたGNRの詳細な構造と光物理的特徴.
- GNRの表面での均一な自己組み立ての実証
結論:
- 開発されたポリメリゼーション方法は,GNR合成に対する正確な構造制御を提供します.
- 合成されたGNRは調節可能な光物理的特性を有する.
- 表面組み立てはGNRベースの装置を製造するための経路を提供します.
関連する概念動画
Step-Growth Polymerization: Overview
4.2K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
4.2K
Ziegler–Natta Chain-Growth Polymerization: Overview
3.8K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.8K
Radical Chain-Growth Polymerization: Overview
3.1K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
3.1K
Radical Chain-Growth Polymerization: Chain Branching
2.4K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
2.4K
Radical Chain-Growth Polymerization: Mechanism
3.3K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
3.3K
Anionic Chain-Growth Polymerization: Overview
2.5K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.5K


