评估在水中的温和热后,石墨烯氧化物表面上氧化功能组的演变
Francesco Amato1, Irene Ferrari1, Alessandro Motta1,2
1Dipartimento di Chimica, Università di Roma "La Sapienza" p.le A. Moro 5 Rome I-00185 Italy andrea.marrani@uniroma1.it.
在水中对氧化石墨烯 (GO) 进行轻度回火,会改变其结构. 在50°C时,水启动了环氧组转化为二醇的过程,在80°C时进一步的重组提高了导电性.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 物理化学 物理化学
背景情况:
- 石墨烯氧化物 (GO) 是一种二维转移稳定的纳米材料.
- 热通常在固态中将GO重建成氧化和石墨相.
- 阶段转换涉及环氧和基函数组.
研究的目的:
- 为了研究在水性介质中分散的GO的轻度回火.
- 探索水在GO阶段转换中的作用.
- 分析退火温度和时间对GO结构和特性的影响.
主要方法:
- 在水性介质中,GO的分散.
- 在50°C和80°C的温度下进行轻度热,持续时间不同.
- 使用X射线光电子光谱学 (XPS),循环电压测量和拉曼光谱学进行表征.
主要成果:
- 实验证据表明,水中的环氧化物不稳定.
- 在50°C时,水将环氧化物启动到邻近的二醇转化,增加氧含量.
- 在80°C时,邻近的二醇转化为基和C=C键,降低氧含量并增加导电性.
结论:
- 水分子在轻度水性回火过程中启动GO功能组重组.
- 热温度显著影响相位转换路径和由此产生的材料特性.
- 水性回火为调整GO导电性和电子亲和性提供了一条新的途径.
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