Meng Xianghua, Dyer Jacqueline, Huo Yifeng, Jiang Chaoyang
Department of Chemistry and Center for Fluorinated Functional Materials, University of South Dakota, Vermillion, South Dakota 57069, United States.
Department of Chemistry, George Washington University, Washington, D.C. 20052, United States.
Langmuir. 2020 Apr 7;36(13):3558-3564. doi: 10.1021/acs.langmuir.0c00079. Epub 2020 Mar 25.
Sharp branches of gold nanostars are critical in tuning the plasmonic properties of these nanostars and maximizing the activities in surface-enhanced Raman scattering (SERS). The interaction between the capping ligands and nanostars plays an essential role in determining the morphology of the branches on the gold nanostars. In this Article, we show that 4-mercapto benzoic acid can effectively control the morphology of branched gold nanostars, and these gold nanostars can be used for the colloidal SERS detection of probe molecules at a nanomolar concentration. We also find that the sharp branches on gold nanostars will provide extra SERS activities as compared to the ones with a rough surface. Using the method of principal component analysis, we can easily distinguish the addition of 4-mercapto pyridine molecules at a concentration of 2 nM. Our work indicated the promising applications of these gold nanostars in colloidal SERS studies for various ultrasensitive chemical analyses.
金纳米星的尖锐分支对于调节这些纳米星的等离子体特性以及最大化表面增强拉曼散射（SERS）活性至关重要。封端配体与纳米星之间的相互作用在决定金纳米星分支的形态方面起着至关重要的作用。在本文中，我们表明4-巯基苯甲酸可以有效地控制分支金纳米星的形态，并且这些金纳米星可用于纳摩尔浓度下探针分子的胶体SERS检测。我们还发现，与表面粗糙的金纳米星相比，金纳米星上的尖锐分支将提供额外的SERS活性。使用主成分分析方法，我们可以轻松区分浓度为2 nM的4-巯基吡啶分子的添加。我们的工作表明这些金纳米星在用于各种超灵敏化学分析的胶体SERS研究中具有广阔的应用前景。
