Functionalized graphene sheets coordinating metal cations
Functionalized graphene sheets coordinating metal cations
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DOI：
10.1016/j.carbon.2014.03.036
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发表时间：
2014-08
期刊：
影响因子：
10.9
通讯作者：
Yasuhiro Yamada;Yukiko Suzuki;H. Yasuda;Saiko Uchizawa;Kaori Hirose-Takai;Y. Sato;K. Suenaga;S. Sato
中科院分区：
文献类型：
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作者：
Yasuhiro Yamada;Yukiko Suzuki;H. Yasuda;Saiko Uchizawa;Kaori Hirose-Takai;Y. Sato;K. Suenaga;S. Sato
研究了Li+、Na+、K+、Mg2+、Ca2+、Sr2+、Cr3+、Mn2+、Fe3+、Co2+、Ni2+、Cu2+、Zn2+等金属阳离子与氨处理过的石墨烯片(G)的相互作用，以及G上含氧官能团和含氮官能团的金属阳离子的热稳定性，方法是分别在2-丙醇中超声和773 K下加热G- metal。一价碱金属阳离子、二价碱土金属阳离子、二价过渡金属阳离子（如Mn2+）和其他金属阳离子（如Zn2+）通过冲洗去除，因为金属阳离子与G（包括各种热稳定的含氮和含氧官能团）之间没有相互作用或相互作用弱。773 K热处理后，Cr3+和Fe3+等三价过渡金属阳离子发生团聚，而Co2+、Ni2+和Cu2+等二价过渡金属阳离子未发生严重团聚。根据密度泛函理论计算，在所有含氮和含氧官能团中，石墨烯边缘的类菲罗啉基团与Ni2+的相互作用最强。在玻璃安瓿中对标准化合物（酞菁镍）进行热处理，证实了n -单键- Ni键的热稳定性在873 K以上。
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 Nsingle bondNi bonding was confirmed as above 873 K as results of heat treatment of a standard compound (Ni phthalocyanine) in a glass ampoule.