Ardianrama Alexander David, Wijaya Yosia Nico, Hur Seung Hyun, Woo Hee-Chul, Kim Mun Ho
Department of Polymer Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea.
School of Chemical Engineering, University of Ulsan, Daehak-ro 93, Nam-gu, Ulsan 680-749, Republic of Korea.
J Colloid Interface Sci. 2019 Sep 15;552:485-493. doi: 10.1016/j.jcis.2019.05.076. Epub 2019 May 25.
Although triangular silver (Ag) nanoplates are intrinsically unstable, this characteristic has been taken advantage of in the development of a novel sensing platform. However, most of these applications have relied on halide ions as etchants. In the current work, we used sodium 4-vinylbenzenesulfonate (Na-VBS) as a new powerful etchant of triangular silver (Ag) nanoplates. When aged with Na-VBS at room temperature, Na-VBS etched Ag nanoplates nearly as powerfully as halides did, and these nanoplates rapidly transformed into oblate nanospheroids. This shape evolution permitted tuning of the corresponding localized surface plasmon resonance (LSPR) features of the Ag nanostructures. Interestingly, passivation of the Ag nanoplate surface with melamine was shown to protect the nanoplates from Na-VBS-induced etching. The rate of change of the color and spectral features of the Ag nanoplate solution exposed to Na-VBS was found to be strongly correlated with the concentration of melamine in the solution. This association allowed us to apply this system to the development of a novel platform for sensing melamine.
尽管三角形银（Ag）纳米片本质上不稳定，但这一特性已被用于开发一种新型传感平台。然而，这些应用大多依赖卤化物离子作为蚀刻剂。在当前工作中，我们使用4-乙烯基苯磺酸钠（Na-VBS）作为三角形银（Ag）纳米片的一种新型强效蚀刻剂。当在室温下与Na-VBS老化时，Na-VBS对Ag纳米片的蚀刻效果几乎与卤化物一样强，并且这些纳米片迅速转变为扁球形纳米体。这种形状演变使得能够调整Ag纳米结构相应的局域表面等离子体共振（LSPR）特性。有趣的是，用三聚氰胺对Ag纳米片表面进行钝化可保护纳米片免受Na-VBS诱导的蚀刻。发现暴露于Na-VBS的Ag纳米片溶液的颜色和光谱特征的变化速率与溶液中三聚氰胺的浓度密切相关。这种关联使我们能够将该系统应用于开发一种新型的三聚氰胺传感平台。
