Preparation of Graphite Oxide Containing Different Oxygen-Containing Functional Groups and the Study of Ammonia Gas Sensitivity.
Preparation of Graphite Oxide Containing Different Oxygen-Containing Functional Groups and the Study of Ammonia Gas Sensitivity.
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DOI：
10.3390/s18113745
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发表时间：
2018-11-02
期刊：
影响因子：
--
通讯作者：
Wang L
中科院分区：
文献类型：
--
作者：
Luo L;Peng T;Yuan M;Sun H;Dai S;Wang L
采用改进的Hummers法制备了一系列氧化石墨样品。使用片状石墨作为原料，并且改变水溶液的反应温度（0 °C、30 °C、50 °C、60 °C、70 °C、80 °C和100 °C）。采用X射线衍射、傅里叶变换红外光谱、拉曼光谱、X射线光电子能谱和接触角测试等方法对氧化石墨样品的结构、化学键、含氧官能团的类型和含量进行了表征。结果表明，通过加水改变反应温度，可以控制各含氧官能团的类型和含量。随着体系温度的升高，氧化石墨样品的氧化程度先增大后减小。体系温度过高（100 °C）导致样品中部分羟基分解形成环氧基，导致石墨层间含氧官能团减少，亲水性差，水分含量低。当系统温度为50 °C时，氧化石墨样品的层间距最大，石墨完全氧化（C/O = 1.85），含氧官能团主要由羟基组成（约占总含氧官能团的28.88%）。高含量的羟基和羧基具有良好的亲水能力，并表现出最高的含水率。在50 °C下的样品由于其高羟基和羧基含量而对氨具有更好的敏感性，其中当氨浓度为20-60 ppm时，样品显示出优异的曲线。
A series of graphite oxide samples were prepared using the modified Hummers method. Flake graphite was used as the raw material and the reaction temperature of the aqueous solution was changed (0 °C, 30 °C, 50 °C, 60 °C, 70 °C, 80 °C, and 100 °C). X-ray diffraction, Fourier-transform infrared spectroscopy, Raman spectral analysis, X-ray photoelectron spectroscopy, and contact angle tests were performed to characterize the structure, chemical bonding, type, and content of oxygen-containing functional groups of the graphite oxide samples. The results showed that the type and content of each oxygen-containing functional group could be controlled by changing the reaction temperature with the addition of water. As the temperature of the system increased, the degree of oxidation of the graphite oxide samples first increased and then decreased. Too high a temperature (100 °C) of the system led to the formation of epoxy groups by the decomposition of some hydroxyl groups in the samples, causing the reduction of oxygen-containing functional groups between the graphite layers, poor hydrophilic properties, and low moisture content. When the system temperature was 50 °C, the interlayer spacing of the graphite oxide samples was at its highest, the graphite was completely oxidized (C/O = 1.85), and the oxygen-containing functional groups were mainly composed of hydroxyl groups (accounting for approximately 28.88% of the total oxygen-containing functional groups). The high content of hydroxyl and carboxyl groups had good hydrophilic ability and showed the highest moisture content. The sample at 50 °C had better sensitivity to ammonia because of its high hydroxyl group and carboxyl group content, with the sample showing an excellent profile when the ammonia concentration was 20–60 ppm.
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DOI：
10.3390/s16010103
发表时间：
2016-01-15
期刊：
Sensors (Basel, Switzerland)
影响因子：
--
作者：
Drewniak S;Muzyka R;Stolarczyk A;Pustelny T;Kotyczka-Morańska M;Setkiewicz M
通讯作者：
Setkiewicz M
影响因子：
3.7
作者：
Ferrari, AC;Robertson, J
通讯作者：
Robertson, J
影响因子：
10.9
作者：
NAKAJIMA, T;MATSUO, Y
通讯作者：
MATSUO, Y
影响因子：
4
作者：
Hamwi, A;Marchand, V
通讯作者：
Marchand, V
影响因子：
7.2
作者：
Chen, Yiming;Zhang, Zhiping;Zhang, Haiyan
通讯作者：
Zhang, Haiyan