title: Identification of Al13on the Colloid Surface Using Surface-Enhanced Raman Spectroscopy.
abstract: Al13is the most active polymeric Al species responsible for coagulation at the solid-liquid interface, whereas the detection techniques for Al13at the interface are currently limited. In this study, for the first time, the identification of Al13on the silicon dioxide-based colloid surface was realized by using surface-enhanced Raman scattering (SERS), which is an ideal surface method sensitive for single-molecule detection. The high purity Al13salts were prepared by an electrolysis procedure followed by precipitation or metathesis. Al13-Clnwas determined to be feasible for the Raman detection as it exhibited more noticeable signals in comparison to Al13-(SO4)pand Al13-(NO3)m. The peak of Al13-Clnat 635 cm-1could be the major characteristic peak of Al13, and the other two peaks at 300 and 987 cm-1could be accessorial evidence for the identification. Further, the identification of Al13adsorbed on the surface of Ag and gold-core/silica-shell colloids was confirmed by the SERS response at the above three wavenumbers with a higher signal-to-noise ratio than the normal Raman scattering. According to the least-squares fitting computed Raman spectra, each of the characteristic peaks was associated with specific vibrational modes.
authors.affiliation: University of Chinese Academy of Sciences, Beijing 100049, P.R. China.
authors.forename: Ning
authors.initials: N
authors.lastname: Li
authors.forename: Chengzhi
authors.initials: C
authors.lastname: Hu
authors.affiliation: Department of Chemistry, Nankai University , Tianjin 300071, P.R. China.
authors.forename: Xiaoning
authors.initials: X
authors.lastname: Fu
authors.affiliation: Department of Chemistry, Nankai University , Tianjin 300071, P.R. China.
authors.forename: Xiufang
authors.initials: X
authors.lastname: Xu
authors.forename: Rui
authors.identifier: 0000-0001-6353-6193
authors.initials: R
authors.lastname: Liu
authors.affiliation: University of Chinese Academy of Sciences, Beijing 100049, P.R. China.
authors.forename: Huijuan
authors.initials: H
authors.lastname: Liu
authors.affiliation: University of Chinese Academy of Sciences, Beijing 100049, P.R. China.
authors.forename: Jiuhui
authors.initials: J
authors.lastname: Qu
mesh_terms: D003102:Colloids / Q000737:chemistry*; D036103:Nanotechnology; D059629:Signal-To-Noise Ratio; D012822:Silicon Dioxide / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013059:Spectrum Analysis, Raman
chemical_list: D003102:Colloids; D012834:Silver; D012822:Silicon Dioxide