ABSTRACT

This work studies the improvement of the emission spectra of polyacrylic acid (PAA) by adding different ratios of rhodamine dye (RhB) to different sizes and shapes of gold nanoparticles (AuNPs). AuNPs were prepared by chemical reduction method at heating temperature 80°C and a different time. The experimental results of both UV–Visible spectroscopy and TEM technique showed that the AuNPs were formed at different times (1–15 min) with different plasmonic band positions and has particle sizes 11 and 13 nm, for AuNPs were formed at 1 and 10 min respectively. FTIR, UV–Vis, X-ray diffraction, and SEM techniques used in the characterization of PAA blended by an equivalent amount of RhB and AuNPs with size 11 and 13 nm. The band appeared at 1683 cm⁻¹ in PAA spectra which is assigned to C=O became doubling in the PAA blended samples due to the AuNPs may be coordinating with the oxygen atom in the C=O group. Fluorescence measurements indicated an emission band appeared at 585 and 590 nm for PAA doped by RhB and AuNPs with size 11 and 13 nm, respectively. The intensity of these emission bands was enhanced for the PAA blended by increasing both AuNPs and RhB ratios due to the interactions between dipole moments of the SPR of the AuNPs and RhB molecules. Therefore, it could be enhancing the fluorescence intensity of these samples, and it can be used as an laser active medium.

Highlights

• Synthesis of AuNPs with different sizes.

• Prepare PAA blended by RhB and AuNPs.

• Study the coordination of AuNPs with PAA using FTIR.

• Explain the effect of RhB and AuNPs on fluorescence spectra.

摘要

这项工作通过将不同比例的若丹明染料（RhB）添加到不同大小和形状的金纳米颗粒（AuNPs）中，研究了聚丙烯酸（PAA）发射光谱的改进。通过化学还原法在加热温度80°C和不同的时间制备AuNPs。紫外可见光谱法和TEM技术的实验结果表明，AuNPs在不同时间（1-15分钟）以不同的等离激元能带位置形成，粒径为11和13 nm，而AuNPs在1和10 min形成。分别。用于表征PAA的FTIR，UV-Vis，X射线衍射和SEM技术由等量的11和13 nm的RhB和AuNP混合而成。带出现在1683 cm ^-1在PAA光谱中，由于AuNPs可能与C = O基团中的氧原子配位，在PAA混合样品中，分配给C = O的光谱变为两倍。荧光测量表明，分别由11和13 nm大小的RhB和AuNPs掺杂的PAA在585和590 nm处出现了发射带。由于AuNPs的SPR的偶极矩与RhB分子之间的相互作用，通过增加AuNPs和RhB的比率提高了PAA混合时这些发射带的强度。因此，可以增强这些样品的荧光强度，并且可以用作激光活性介质。

强调

• 具有不同大小的AuNP的合成。

• 准备由RhB和AuNP混合而成的PAA。

• 利用FTIR研究AuNP与PAA的配位。

• 解释RhB和AuNPs对荧光光谱的影响。