In Situ Probing of Laser Annealing of Plasmonic Substrates with Surface-Enhanced Raman Spectroscopy.
In Situ Probing of Laser Annealing of Plasmonic Substrates with Surface-Enhanced Raman Spectroscopy.
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DOI：
10.1021/acs.jpcc.8b01443
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发表时间：
2018-05
期刊：
影响因子：
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通讯作者：
Chaoxiong Ma;Kaiyu Fu;M. J. Trujillo;Xin Gu;Nameera F. Baig;P. Bohn;J. Camden
中科院分区：
文献类型：
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作者：
Chaoxiong Ma;Kaiyu Fu;M. J. Trujillo;Xin Gu;Nameera F. Baig;P. Bohn;J. Camden
在这项工作中，我们使用表面增强拉曼散射(SERS)和4-巯基苯甲酸(4-MBA)作为分子探针，对模板法制备的银衬底的激光退火过程进行了现场监测。在对激光功率有很强依赖性的热处理过程中，固载的4-MBA的表面增强拉曼散射谱(>；50×)有很大的提高。利用光学和扫描电子显微镜图像，这种增强的SERS响应与衬底形态的变化相关联。我们将这种巨大的增强归因于4-MBA通过夹心结构中的硫醇和CoO-基团结合而促进了纳米GaP的形成，导致了电磁和化学增强。随着SERS强度的不断增加，这种退火效应不仅限于AgNP阵列，还包括沉积在各种纳米孔模板上的Ag薄膜。本研究为等离子体SERS衬底的原位优化提供了一种简单的策略。
In this work, we in situ monitor the laser annealing of template-fabricated silver substrates using surface-enhanced Raman scattering (SERS) and 4-mercaptobenzoic acid (4-MBA) as a molecular probe. The annealing process, which exhibits a strong dependence on the laser power, yields a large (>50×) increase in the SERS of the immobilized 4-MBA. This increased SERS response is correlated with the changing substrate morphology using optical and scanning electron microscope images. We attribute the large enhancement to the formation of nanogaps facilitated by binding of the 4-MBA through both thiol and COO- groups in a sandwich structure, resulting in both electromagnetic and chemical enhancement. This annealing effect, associated with the continuous increase of SERS intensity, was not limited to the AgNP arrays but included Ag films deposited on a variety of nanoporous templates. This study provides a simple strategy for in situ optimization of plasmonic SERS substrates.