Acta Optica Sinica, Volume. 40, Issue 12, 1224001(2020)
Carbon Nanotube/Silver Used for Highly Sensitive Self-Calibrating Raman Detection
Herein, the substrate comprising carbon nanotubes and silver nanoparticles (CNTs/Ag1) was first prepared using the one-step method, and then CNTs/Ag1 was decorated by the additional Ag nanoparticle sol (Ag2) to constitute the final composite structural substrate (CNTs/Ag1/Ag2). The corresponding electric field distributions and the enhancement factors were calculated using the three-dimensional finite difference time domain (3D-FDTD) algorithm. Experimental results of Raman test show that the detection limit is 10 -15 mol/L for rhodamine 6G (R6G). Quantitative detection of R6G with a low-concentration of 10 -15-10 -10 mol/L is realized using the normalized ratio k. The relative standard deviation (RSD) value of k is as low as half of the RSD of Raman intensity. Moreover, quantitative detection of crystal violet (CV) solution with a concentration of 10 -9-10 -6 mol/L is achieved. The linearity-fitting degrees of all k values of two probe molecules are larger than 99% at different concentrations.
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Haojian Xing, Jie Zhang, Zenghe Yin, Yong Zhu. Carbon Nanotube/Silver Used for Highly Sensitive Self-Calibrating Raman Detection[J]. Acta Optica Sinica, 2020, 40(12): 1224001
Category: Optics at Surfaces
Received: Jan. 9, 2020
Accepted: Mar. 16, 2020
Published Online: Jun. 3, 2020
The Author Email: Zhang Jie (zhangjie@cqu.edu.cn)