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研究了纳米金粒子修饰碳纳米管阵列结构的表面增强拉曼散射性能。通过FDTD理论模拟仿真了不同粒径纳米金颗粒的场强分布;并采用化学还原的方法制备出直径分别为20、40和60nm三种不同粒径的金颗粒,然后将纳米金粒子修饰到有序定向的碳纳米管阵列表面,并将该结构作为表面增强拉曼基底。FDTD软件仿真结果表明,60nm粒径的纳米金颗粒周围场强分布最强,是入射场场强的15倍。同时将罗丹明6G溶液用于测试几组不同尺寸的金颗粒对拉曼散射光强的影响,发现60nm金颗粒对R6G拉曼信号增强最大。FDTD理论模拟仿真和罗丹明6G溶液实验测试结果表明:金颗粒尺寸在20~60nm内,颗粒尺寸越大,拉曼散射光的光强越大。
The surface enhanced Raman scattering properties of nano-gold particle-modified carbon nanotube arrays were studied. The field strength distribution of gold nanoparticles with different particle sizes was simulated by FDTD theory. Gold particles with diameters of 20, 40 and 60 nm were prepared by chemical reduction, and then the gold nanoparticles were modified to Oriented carbon nanotube array surface, and the structure as a surface-enhanced Raman substrate. The simulation results of FDTD software show that the intensity distribution of the 60nm-sized Au nanoparticles is the strongest, which is 15 times stronger than that of the incident field. At the same time, rhodamine 6G solution was used to test the effect of several different sizes of gold particles on Raman scattering light intensity, and it was found that the 60 nm gold particles enhanced the R6G Raman signal to the maximum. FDTD theoretical simulation and experimental results of rhodamine 6G solution show that the larger the particle size is, the larger the Raman scattering light intensity is.