通过表面特定振动光谱研究聚合物在石墨和 CVD 石墨烯表面的吸附。
Polymer Adsorption on Graphite and CVD Graphene Surfaces Studied by Surface-Specific Vibrational Spectroscopy.
机构信息
State Key Laboratory of Surface Physics and Department of Physics, Fudan University , Shanghai 200433, China.
Collaborative Innovation Center of Advanced Microstructures, Fudan University , Shanghai 200433, China.
出版信息
Nano Lett. 2015 Oct 14;15(10):6501-5. doi: 10.1021/acs.nanolett.5b02025. Epub 2015 Sep 21.
Sum-frequency vibrational spectroscopy was employed to probe polymer contaminants on chemical vapor deposition (CVD) graphene and to study alkane and polyethylene (PE) adsorption on graphite. In comparing the spectra from the two surfaces, it was found that the contaminants on CVD graphene must be long-chain alkane or PE-like molecules. PE adsorption from solution on the honeycomb surface results in a self-assembled ordered monolayer with the C-C skeleton plane perpendicular to the surface and an adsorption free energy of ∼42 kJ/mol for PE(H(CH2CH2)nH) with n ≈ 60. Such large adsorption energy is responsible for the easy contamination of CVD graphene by impurity in the polymer during standard transfer processes. Contamination can be minimized with the use of purified polymers free of PE-like impurities.
和频振动光谱被用于探测化学气相沉积（CVD）石墨烯上的聚合物污染物，并研究烷烃和聚乙烯（PE）在石墨上的吸附。在比较两种表面的光谱时，发现 CVD 石墨烯上的污染物必须是长链烷烃或类似 PE 的分子。PE 从溶液中在蜂窝状表面上吸附导致具有 C-C 骨架平面垂直于表面的自组装有序单层，并且 PE（H（CH2CH2）nH）的吸附自由能约为 42 kJ/mol，其中 n ≈ 60。如此大的吸附能是在标准转移过程中 CVD 石墨烯容易被聚合物中的杂质污染的原因。使用不含类似 PE 杂质的纯化聚合物可以将污染最小化。
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