Chemical Imaging of Self-Assembled Monolayers on Copper Using Compressive Hyperspectral Sum Frequency Generation Microscopy,The Journal of Physical Chemistry B

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Chemical Imaging of Self-Assembled Monolayers on Copper Using Compressive Hyperspectral Sum Frequency Generation Microscopy
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2017-08-10 00:00:00 , DOI: 10.1021/acs.jpcb.7b03339
Desheng Zheng ₁ , Liyang Lu ₂ , Kevin F. Kelly ₂ , Steven Baldelli ₁

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Sum frequency generation microscopy is a label-free optical imaging technique with intrinsic molecular vibrational contrast for surface studies. Recent developments of compressive sensing broad-band hyperspectral SFG microscopy have demonstrated the potential application for imaging monolayer at metal surfaces with micrometer spatial resolution. Here is presented the capability of chemical imaging of spatially patterned monolayers of 1-octadecanethiol (ODT) and 16-methoxy-1-hexadecanethiol (MeOHT) molecules assembled on a copper surface. The spatial distributions of the monolayer with vibrational-spectral contrast are well-demonstrated at different frequency regions through reconstruction of the hypercube using a 3-dimensional total variation regularization algorithm (3DTV). Spatial-chemical distributions of each component are also reconstructed directly from the compressive measurements by endmember unmixing (CEU) scheme. Compared to 3DTV algorithm, the reconstruction from CEU shows spatial distribution of each component on the surfaces, and demonstrates the ability to characterize the domains of mixed-molecules on surfaces.

中文翻译：

使用压缩高光谱和频产生显微镜对铜上自组装单分子膜的化学成像

求和频率生成显微镜是一种无标记的光学成像技术，具有固有的分子振动对比度，可用于表面研究。压缩传感宽带高光谱SFG显微镜的最新发展已证明了以微米空间分辨率对金属表面的单层成像进行成像的潜在应用。此处介绍了对组装在铜表面上的1-十八烷硫醇（ODT）和16-甲氧基-1-十六烷硫醇（MeOHT）分子的空间图案化单分子层进行化学成像的能力。通过使用3D总变化正则化算法（3DTV）重建超立方体，在不同的频率区域可以很好地演示具有振动光谱对比的单层空间分布。每个组分的空间化学分布也可以通过端基分解（CEU）方案直接从压缩测量中重建。与3DTV算法相比，从CEU进行的重建显示了表面上每个组件的空间分布，并展示了表征表面上混合分子域的能力。

更新日期：2017-08-10

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