在均匀的PDMS薄膜上原位生成金和银纳米粒子并对其等离激元颜色进行比色分析

The incorporation of metal nanoparticles (MeNPs), such as gold and silver (AuNPs and AgNPs), in polymer matrices for a diversity of applications, has gained much interest in recent years. However, a viable strategy for producing uniform samples remains challenging. In this work, we have demonstrated a facile procedure for loading AuNPs and AgNPs on previously prepared uniform polydimethylsiloxane (PDMS) films supported on glass slides, named [email protected] and [email protected] The reaction of HAuCl\u003csub\u003e4\u003c/sub\u003e or AgNO\u003csub\u003e3\u003c/sub\u003e, in an ethanol solution, with immersed PDMS films took place without the need to add other chemicals, resulting in uniform coverage of nanoparticles dependent on reaction time and temperature. Plasmonic colors of [email protected] and [email protected] films were monitored collecting colorimetric data, expressed as total color difference ΔE, using a portable and handled spectrophotometer. As observed for colorimetric data, the UV–vis analysis of the SPR (surface plasmon resonance) absorption bands, at 530 nm for [email protected] and 400 nm for [email protected], were dependent on the reaction time and temperature (25, 33, and 55 °C). The ΔE data exhibit a linear correlation with reaction time for all three investigated temperatures, and these results can be used as work curves in the future preparation of new samples. This study contributes to our understanding of the experimental conditions to produce uniform [email protected] films with tunable plasmonic color. [email protected] and [email protected] films can be promising plasmonic and colorimetric sensors due to their performance and simple fabrication.