In situ observation of metal ion interactions with graphene oxide layers: From the growth of metal hydroxide to metal oxide formation
In situ observation of metal ion interactions with graphene oxide layers: From the growth of metal hydroxide to metal oxide formation
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原位观察金属离子与氧化石墨烯层的相互作用：从金属氢氧化物的生长到金属氧化物的形成
DOI：
10.1016/j.carbon.2021.08.073
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发表时间：
2021-10
期刊：
影响因子：
10.9
通讯作者：
Li Xiaolong
中科院分区：
文献类型：
--
作者：
Li Zhao;Wang Rui;Wu Shuaijin;Xue Zhipeng;Zhu Daming;Zou Jianxin;Li Xiaolong
通过原位二维掠入射 X 射线衍射 (GIXRD) 研究了金属离子和氧化石墨烯 (GO) 纳米片之间的相互作用。我们发现，由于带正电的氢氧化物和带负电的GO纳米片之间的静电相互作用，金属阳离子（Mn2+、Co2+、Cu2+、Fe3+）和GO可以通过滴铸金属氯化物和GO溶液而自组装成氢氧化物/GO超晶格，并且超晶格的层间距可以通过阳离子种类来控制。此外，基于这种超晶格模板，通过后续退火可以很容易地获得石墨烯基金属氧化物纳米片。 GO/阳离子系统的生长机制和结构演化可分为四个阶段：（1）水溶液中GO夹层的水合阳离子插层； (2) 退火过程中 GO 层之间金属氢氧化物的生长，在约 250 °C 时形成超晶格结构； (3)随着温度的升高，还原GO(rGO)中间层之间的金属氧化物成核； (4) 在 600°C 的温度下完成石墨烯层分解，并形成金属氧化物纳米片。这项工作为理解金属阳离子和GO之间的相互作用和生长行为提供了新的视角。
The interactions between metal ions and graphene oxide (GO) nanosheets were investigated by in situ two-dimensional grazing incidence X-ray diffraction (GIXRD). We found that metal cations (Mn2+, Co2+, Cu2+, Fe3+) and GO can self-assemble into a hydroxide/GO superlattice by drop-casting a metal chloride and GO solution due to the electrostatic interactions between the positively charged hydroxide and the negatively charged GO nanosheets and the interlayer spacing of the superlattice can be controlled by the cation species. Moreover, based on this superlattice template, graphene-based metal oxide nanosheets can be facilely obtained by subsequent annealing. The growth mechanism and structural evolution of the GO/cation systems can be described in four stages: (1) hydrated cation intercalation of the GO interlayer in an aqueous solution; (2) metal hydroxide growth between the GO layers during annealing, with the formation of a superlattice structure at approximately 250 °C; (3) metal oxide nucleation between the reduced GO (rGO) interlayers with increasing temperature; and (4) complete graphene layer decomposition at a temperature of 600 °C, along with metal oxide nanosheet formation. This work gives a new perspective for understanding the interactions between and growth behaviour of metal cations and GO.
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影响因子：
62.1
作者：
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通讯作者：
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作者：
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影响因子：
15
作者：
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通讯作者：
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影响因子：
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作者：
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通过氧化石墨烯膜进行精确、超快的分子筛分
影响因子：
56.9
作者：
Joshi, R. K.;Carbone, P.;Nair, R. R.
通讯作者：
Nair, R. R.