CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology (NCNST), Beijing 100190, P. R. China.
University of Chinese Academy of Science, Beijing 100049, P. R. China.
Nanoscale. 2023 Jun 30;15(25):10651-10660. doi: 10.1039/d3nr01371e.
Recently, in combination with seed-mediated growth, thiolated chiral molecule-guided growth has shown great promise in obtaining chiral plasmonic nanostructures. Previously, with the assistance of chiral cysteines (Cys), we realized helical growth of plasmonic shells on gold nanorod (AuNR) seeds dispersed in cetyltrimethylammonium bromide (CTAB) solution. Herein, we further studied the roles of non-chiral cationic surfactants in tuning the helical growth. Both the counter anion and the hydrocarbon chain length of the surfactants were found to affect the formation of helical shells greatly. In particular, we exhibited surfactant-modulated conversion of the chiral shell deposition mode between layer growth and island growth. By optimizing growth conditions, an obvious plasmonic circular dichroism (PCD) response could be achieved for the island helical shell. Our findings demonstrated promising potential of nanochemical synthesis in fabricating chiral plasmonic nanostructures with small structural sizes.
最近，在种子介导生长的基础上，巯基手性分子导向生长在获得手性等离子体纳米结构方面显示出巨大的潜力。在此之前，在半胱氨酸（Cys）的辅助下，我们实现了手性等离子体壳在金纳米棒（AuNR）种子上的螺旋生长，这些种子分散在十六烷基三甲基溴化铵（CTAB）溶液中。在此基础上，我们进一步研究了非手性阳离子表面活性剂在调节螺旋生长中的作用。发现表面活性剂的抗衡阴离子和烃链长度都对手性壳层的形成有很大的影响。特别地，我们展示了表面活性剂调控的手性壳层沉积模式从层生长到岛生长的转变。通过优化生长条件，可以实现岛状螺旋壳的明显的等离子体圆二色性（PCD）响应。我们的发现表明，纳米化学合成在手性等离子体纳米结构的制备方面具有很大的潜力，这些结构具有较小的结构尺寸。
