Tian Xiaoran, Yu Qian, Kong Xianming, Zhang Miao
School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, China.
Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden.
Front Chem. 2022 Mar 11;10:847203. doi: 10.3389/fchem.2022.847203. eCollection 2022.
The colloidal polystyrene (PS) was synthesized and decorated with silver nanoparticles (Ag NPs). The plasmonic Ag@PS nanocomposite was prepared by loading Ag NPs on PS microsphere through a seed-mediated growth route. The property of Ag NPs deposited on the PS microsphere could be precisely controlled by adjusting the concentration of the chemicals used in the growth medium. The growth step is only limited by the diffusion of growing species in the growth media to the surface of the Ag seed. The Ag@PS prepared via the growth method exhibited two advantages compared with the self-assembled PS/Ag. First, the high-density of Ag NPs were successfully deposited on the surface of PS as the electroless-deposited Ag seed process, which brings nearly three times SERS enhancement. Second, the rapid preparation process for growth method (half an hour, 10 h for the self-assembled method). The PS/Ag could detect Nile blue A (NBA) down to 10 M by SERS. Furthermore, the plasmonic Ag@PS SERS substrate was used for pesticide identification. The on-site monitoring malachite green (MG) from fish was achieved by portable Raman spectrometer, and the limit of detection (LOD) was 0.02 ppm. The Ag@PS substrate has also shown capability for simultaneously sensing multiple pesticides by SERS.
合成了胶体聚苯乙烯（PS）并用银纳米颗粒（Ag NPs）进行修饰。通过种子介导的生长途径将Ag NPs负载在PS微球上制备了等离子体Ag@PS纳米复合材料。通过调节生长介质中所用化学物质的浓度，可以精确控制沉积在PS微球上的Ag NPs的性质。生长步骤仅受生长物种在生长介质中向Ag种子表面扩散的限制。与自组装的PS/Ag相比，通过该生长方法制备的Ag@PS具有两个优点。第一，作为无电沉积Ag种子过程，高密度的Ag NPs成功沉积在PS表面，这带来了近三倍的表面增强拉曼散射（SERS）增强。第二，生长方法的制备过程快速（半小时，自组装方法为10小时）。PS/Ag通过SERS能够检测低至10⁻⁹ M的尼罗蓝A（NBA）。此外，等离子体Ag@PS SERS基底用于农药鉴定。通过便携式拉曼光谱仪实现了对鱼中孔雀石绿（MG）的现场监测，检测限（LOD）为0.02 ppm。Ag@PS基底还显示出通过SERS同时检测多种农药的能力。
