title: Surface-enhanced Raman spectroscopic analysis of maleic hydrazide adsorbed on gold surface.
abstract: In this paper, surface-enhanced Raman scattering (SERS) spectra of maleic hydrazide (MH, 6-hydroxy-3(2H)-pyridazinone) were studied by using citrate-reduced gold colloidal nanoparticles. Comparisons between the prominent SERS bands and the precise mode descriptions predicted through density functional theory (DFT) simulations at the B3LYP/6-311++g(d,p) level allowed an in-depth orientation analysis of the adsorbed species on gold surfaces. And main forms of hydrogen bonds in the solid state of MH were also determined to be O-H⋯O. Furthermore, the effects of concentration and pH on the SERS spectra of the molecule were discussed. It is found that with the different adsorbate concentration, the SERS spectra of MH show significant changes in their features, indicating different orientations and adsorption sites of the molecule on the gold colloidal surface. The SERS and absorption spectra under different pH conditions show that a basic environment leads to the deprotonation of N2 and the nearly parallel orientation of the MH molecule on the gold surface. Moreover, the enhanced characteristic bands were observed at MH concentrations down to about 1 ppm with the gold colloids, demonstrating a potential of the technique in the analysis of MH residues.
authors.affiliation: MOE Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, 510631 Guangzhou, China.
authors.forename: Can
authors.initials: C
authors.lastname: Wang
authors.affiliation: MOE Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, 510631 Guangzhou, China. Electronic address: guhm@scnu.edu.cn.
authors.forename: Huaimin
authors.initials: H
authors.lastname: Gu
authors.affiliation: MOE Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, 510631 Guangzhou, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Lv
authors.affiliation: MOE Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, 510631 Guangzhou, China.
authors.forename: Ruoyu
authors.initials: R
authors.lastname: He
authors.affiliation: MOE Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, 510631 Guangzhou, China.
authors.forename: Juling
authors.initials: J
authors.lastname: Zhang
mesh_terms: D065966:Absorption, Physicochemical; D000327:Adsorption; D003102:Colloids / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008300:Maleic Hydrazide / Q000737:chemistry*; D008968:Molecular Conformation; D053758:Nanoparticles / Q000737:chemistry; D019697:Onions / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013059:Spectrum Analysis, Raman; D013237:Stereoisomerism; D013499:Surface Properties; D013696:Temperature
chemical_list: D003102:Colloids; D006046:Gold; D008300:Maleic Hydrazide
keywords: DFT; Gold colloids; Maleic hydrazide; SERS