Functionalized graphene sheets coordinating metal cations

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• 作者：Yasuhiro Yamada^a ; ^{y-yamada@faculty.chiba-u.jp" class="auth_mail} ; Yukiko Suzuki^a ; Hajime Yasuda^a ; Saiko Uchizawa^a ; Kaori Hirose-Takai^b ; Yuta Sato^b ; Kazu Suenaga^b ; Satoshi Sato^a
• 刊名：Carbon
• 出版年：August 2014
• 年：2014
• 卷：75
• 期：Complete
• 页码：81-94
• 全文大小：2930 K

文摘

Interactions of metal cations such as Li⁺, Na⁺, K⁺, Mg²⁺, Ca²⁺, Sr²⁺, Cr³⁺, Mn²⁺, Fe³⁺, Co²⁺, Ni²⁺, Cu²⁺, and Zn²⁺ with ammonia-treated graphene sheets (G) and thermal stability of metal cations coordinated with oxygen- and nitrogen-containing functional groups on G were investigated by rinsing G coordinated with metal cations (G-Metal) in 2-propanol using sonication and by heating G-Metal at 773 K, respectively. Monovalent alkali metal cations, divalent alkaline-earth metal cations, divalent transition metal cations such as Mn²⁺, and the other metal cation such as Zn²⁺ were removed by rinsing because of either no interaction or weak interactions between metal cations and G including various thermally stable nitrogen- and oxygen-containing functional groups. Trivalent transition metal cations such as Cr³⁺ and Fe³⁺ were agglomerated by heat treatment at 773 K, whereas divalent transition metal cations such as Co²⁺, Ni²⁺, and Cu²⁺ remained without severe agglomeration. Phenanthroline-like groups on edges of graphene showed the strongest interaction with Ni²⁺ among all of investigated nitrogen- and oxygen-containing functional groups as results of density functional theory calculation. The thermal stability of NNi bonding was confirmed as above 873 K as results of heat treatment of a standard compound (Ni phthalocyanine) in a glass ampoule.