Spectroscopic Metrics for Alkyl Chain Ordering in Lying-Down Noncovalent Monolayers of Diynoic Acids on Graphene,Chemistry of Materials

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Spectroscopic Metrics for Alkyl Chain Ordering in Lying-Down Noncovalent Monolayers of Diynoic Acids on Graphene
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-04-02 00:00:00 , DOI: 10.1021/acs.chemmater.7b04434
Shane R. Russell ₁ , Tyson C. Davis ₁ , Jae Jin Bang ₁ , Shelley A. Claridge _{1,

2}

Affiliation

Noncovalent monolayer chemistries are widely used to control physical properties of 2D materials. For many applications (e.g., energy conversion, sensing), molecular ordering across a range of length scales is important in determining the physical properties of the interface. Scanning probe microscopy can resolve details of molecular packing and orientation over nanoscopic areas of graphene, graphite, and other 2D materials; however, evaluating molecular ordering over larger scales is also key. Such ordering is especially challenging to characterize at large scales for lying-down phases (thickness <0.5 nm) on topographically rougher materials such as graphene (vs flatter graphite). Here, we combine scanning electron microscopy and polarization-modulated IR reflection absorption spectroscopy to evaluate alkyl chain ordering in lying-down monolayers of diynoic acids on few-layer graphene and graphite substrates with areas ∼1 cm². The ability to assess ordering in this widely used class of molecules reinforces the potential utility of spectroscopic metrics for evaluating structure in noncovalently functionalized 2D materials at micro- and macroscopic scales.

中文翻译：

石墨烯上己二酸的非共价单层下烷基链排序的光谱学度量

非共价单层化学被广泛用于控制2D材料的物理性质。对于许多应用（例如，能量转换，传感），在确定界面的物理属性时，整个长度范围内的分子有序化非常重要。扫描探针显微镜可以解析石墨烯，石墨和其他2D材料在纳米范围内的分子堆积和取向的细节；但是，评估更大范围内的分子有序性也是关键。对于在诸如石墨烯（相对较平坦的石墨）这样的形貌较粗糙的材料上大规模地表征卧相（厚度<0.5 nm）而言，这种排序尤其具有挑战性。这里，²。评估这种广泛使用的分子类别中的有序能力增强了光谱学度量在微观和宏观尺度上评估非共价官能化2D材料中结构的潜在效用。

更新日期：2018-04-02

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