Zakaria Rozalina, Yusoff Siti Fatimah Az Zahra, Law Kok Chung, Lim Chin Seong, Ahmad Harith
Photonics Research Centre, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, Semenyih, 43500, Selangor Darul Ehsan, Malaysia.
Nanoscale Res Lett. 2017 Dec;12(1):50. doi: 10.1186/s11671-016-1793-y. Epub 2017 Jan 18.
In this report, we experimentally investigate the formation of "flower-like silver structures" on graphene. Using an electrochemical deposition technique with deposition times of 2.5 and 5 min, agglomerations of silver nanoparticles (AgNPs) were deposited on the graphene surfaces, causing the formation of "flower-like structures" on the graphene substrate. Localized surface plasmon resonance (LSPR) was observed in the interaction between the structures and the graphene substrate. The morphology of the samples was observed using a field-emission scanning electron microscope (FESEM) and Raman spectroscopy. Thereafter, the potential of the flower-like Ag microstructures on graphene for use in Raman spectroscopic applications was examined. The signal showed a highest intensity value after a deposition time of 5 min, as portrayed by the intense local electromagnetic fields. For a better understanding, the CST Microwave Studio software, based on the finite element method (FEM), was applied to simulate the absorption characteristics of the structures on the graphene substrate. The absorption peak was redshifted due to the increment of the nanoparticle size.
在本报告中，我们通过实验研究了石墨烯上“花状银结构”的形成。采用电化学沉积技术，沉积时间分别为2.5分钟和5分钟，银纳米颗粒（AgNP）团聚体沉积在石墨烯表面，导致在石墨烯基底上形成“花状结构”。在结构与石墨烯基底的相互作用中观察到了局域表面等离子体共振（LSPR）。使用场发射扫描电子显微镜（FESEM）和拉曼光谱观察了样品的形态。此后，研究了石墨烯上花状银微结构在拉曼光谱应用中的潜力。如强局部电磁场所示，沉积5分钟后信号显示出最高强度值。为了更好地理解，应用基于有限元方法（FEM）的CST微波工作室软件来模拟结构在石墨烯基底上的吸收特性。由于纳米颗粒尺寸的增加，吸收峰发生了红移。
