论文标题
用原位多波长拉曼光谱探测的石墨烯的可逆硫酸掺杂
Reversible Sulfuric Acid Doping of Graphene Probed by in-situ Multi-Wavelength Raman Spectroscopy
论文作者
论文摘要
由于晶格应变和电荷密度会影响石墨烯的各种材料特性，因此需要一种可靠，有效的方法来定量两个变量。虽然拉曼光谱是敏感且无损的，但尚未测试其对化学电荷掺杂精确定量的有效性。在这项工作中，我们对原位定量了2D和G峰的分数变化，该硫酸溶液引起的电荷密度以及天然晶格菌株的响应。基于实验数据和理论上的佐证，我们提出了一种光学方法，该方法同时确定了三个流行的激发波长为457、514和633 nm的应变和化学诱导的电荷密度。为了通过石墨烯-SIO2底物加快掺杂剂物种的插入，纳米孔的致密阵列是通过热氧化在石墨烯中精确产生的。纳米服装石墨烯膜系统对于多个兴奋剂和悬而未决的过程非常可靠，并且将在研究与石墨烯的各种化学相互作用方面有用。
Since lattice strain and charge density affect various material properties of graphene, a reliable and efficient method is required for quantification of the two variables. While Raman spectroscopy is sensitive and non-destructive, its validity towards precise quantification of chemical charge doping has not been tested. In this work, we quantified in-situ the fractional frequency change of 2D and G peaks in response of charge density induced by sulfuric acid solution as well as native lattice strain. Based on the experimental data and theoretical corroboration, we presented an optical method that simultaneously determines strain and chemically-induced charge density for three popular excitation wavelengths of 457, 514 and 633 nm. In order to expedite intercalation of dopant species through the graphene-SiO2 substrates, dense arrays of nanopores were precisely generated in graphene by thermal oxidation. The nano-perforated graphene membrane system was robust for multiple cycles of doping and undoping processes, and will be useful in studying various types of chemical interactions with graphene.
