Effect of Au Polymer Adsorption Sites on Surface Enhanced Raman Spectroscopy of Amitrole Molecule
GU Yi-fan1, LIAN Shuai1, GAO Xun1*, SONG Shao-zhong2*, LIN Jing-quan1
1. School of Science, Changchun University of Science and Technology, Changchun 130022, China
2. School of Data Science and Artificial Intelligence, Jilin Engineering Normal University, Changchun 130052, China
Abstract：Amitrole is a chemical herbicide in the form of white crystalline powder.It is extremely destructive to the environment, and heavy use can contaminate food and cause cancer. There are relatively few researches on Raman enhancement mechanism of amitrole molecules using density functional theory. Therefore, a model describing the adsorption pattern between the molecule and the substrate was established to predict the surface-enhanced Raman spectrum of amitrole molecules. First, Multiwfn and VMD software were used to calculate the surface electrostatic potential distribution of amitrole molecules and search for the best coordination position between amitrole molecules and Au atoms. It can be obtained that N1, N4 and N6 is the best place for amitrole molecules to coordinate with Au. Based on density functional theory, software GaussView5.0 and Gaussian09, was used to optimize the geometric configuration of amitrole molecules by B3LYP/6-31++G(d, p) basis set. And 6-31++G(d, p)(C, H, N)/Lanladz(Au) basis set was used to calculate the conventional Raman scattering spectra of amitrole molecules and the surface adsorption of amitrole molecules and Au4 clusters and Au6 clusters enhanced Raman scattering spectra. Finally, feature peak identification and comparison are carried out. The results show that the position of the characteristic peaks does not change greatly, but the intensity of some characteristic peaks increases obviously. In the complex formed by coordination between Au and N1, the Raman activity of amitrole molecules was obvious at 1 064, 1 200, 1 392 and 1 592 cm-1. In the complex formed by coordination between Au and N4, the Raman activity of amitrole molecules was obvious at 1 304 cm-1. In the complex formed by coordination between Au and N6, the Raman activity of amitrole molecules was obvious at 1 064, 1 520 and 1 592 cm-1. Through comparison, the compound formed by coordination between Au and N1, N6 has a better enhancement effect, and the maximum enhancement of characteristic peak reached 41, 81, 55 and 96 times respectively. The results show that the complexes formed by coordinating Au with N1 and N6 have a better reinforcement effect. The maximum enhancement factor of Au4 polymer and Au6 polymer with N1 adsorption reached 41 and 81 times respectively; The maximum enhancement factor of Au4 polymer and Au6 polymer with N6 adsorption reached 55 and 96 times respectively. Amitrole molecules and Au atoms have an obvious Raman enhancement effect. When the number of Au polymers increases from four to six, the Raman spectrum enhancement effect is obvious. This work laid a foundation for studying the SERS enhanced mechanism of amitrole molecules.
顾一帆，廉 帅，高 勋，宋少忠，林景全. Au聚体的吸附位点对杀草强分子表面增强拉曼光谱的影响研究[J]. 光谱学与光谱分析, 2022, 42(12): 3709-3713.
GU Yi-fan, LIAN Shuai, GAO Xun, SONG Shao-zhong, LIN Jing-quan. Effect of Au Polymer Adsorption Sites on Surface Enhanced Raman Spectroscopy of Amitrole Molecule. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(12): 3709-3713.
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