Ag and Au Nanoparticles as Color Indicators for Monomer/Micelle–Nanoparticle Interactions,Langmuir

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Ag and Au Nanoparticles as Color Indicators for Monomer/Micelle–Nanoparticle Interactions
Langmuir ( IF 3.7 ) Pub Date : 2022-06-16 , DOI: 10.1021/acs.langmuir.2c00853
Prabhjot Kaur _{1,

2,

3} , Jaspreet Kaur Rajput ₃ , Kultar Singh ₄ , Poonam Khullar ₂ , Mandeep Singh Bakshi ₁

Affiliation

Ag and Au nanoparticles (NPs) were used as color indicators to determine the monomer/micelle adsorption on the NP surface. A simple methodology based on the color change of Ag/Au NPs upon interacting with surface-active molecules was developed. A contrasting color change occurred when NPs interact with the monomer/micelle. This was demonstrated by monitoring the adsorption behavior of a series of Gemini surfactants. UV–visible measurements showed a large change in the intensity and wavelength of Ag/Au NP absorbance upon the surface adsorption of the monomer/micelle of Gemini surfactants. The mechanism of surface adsorption and molecular orientation on the solid–liquid interface of NPs was determined by performing the FT-IR and XPS measurements. Results demonstrated that sharp color changes from yellow to red for Ag NPs and red to purple for Au NPs happened when the Gemini surfactant monomer/micelle adsorbs on the NP surface. This colorimeter-based methodology highlighted the applicability of Ag/Au NPs in complex media where such NPs frequently encounter surface-active molecules.

中文翻译：

银和金纳米粒子作为单体/胶束-纳米粒子相互作用的颜色指示剂

Ag 和 Au 纳米粒子 (NPs) 用作颜色指示剂来确定 NP 表面上的单体/胶束吸附。开发了一种基于 Ag/Au NP 在与表面活性分子相互作用时颜色变化的简单方法。当 NP 与单体/胶束相互作用时，会发生对比鲜明的颜色变化。这通过监测一系列 Gemini 表面活性剂的吸附行为得到证明。紫外-可见测量显示，在 Gemini 表面活性剂的单体/胶束表面吸附后，Ag/Au NP 吸光度的强度和波长发生了很大变化。通过执行 FT-IR 和 XPS 测量确定了 NPs 固-液界面上的表面吸附和分子取向机制。结果表明，当 Gemini 表面活性剂单体/胶束吸附在 NP 表面时，Ag NPs 的颜色从黄色变为红色，Au NPs 的颜色从红色变为紫色。这种基于比色计的方法强调了 Ag/Au NPs 在复杂介质中的适用性，其中此类 NPs 经常遇到表面活性分子。

更新日期：2022-06-16

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