title: Self-assembly of silver nanoparticles as high active surface-enhanced Raman scattering substrate for rapid and trace analysis of uranyl(VI) ions.
abstract: A facile surface-enhanced Raman scattering (SERS) substrate based on the self-assembly of silver nanoparticles on the modified silicon wafer was obtained, and for the first time, an advanced SERS analysis method basing on this as-prepared substrate was established for high sensitive and rapid detection of uranyl ions. Due to the weakened bond strength of OUO resulting from two kinds of adsorption of uranyl species ("strong" and "weak" adsorption) on the substrate, the ν1symmetric stretch vibration frequency of OUO shifted from 871cm-1(normal Raman) to 720cm-1and 826cm-1(SERS) along with significant Raman enhancement. Effects of the hydrolysis of uranyl ions on SERS were also investigated, and the SERS band at ~826cm-1was first used to approximately define the constitution of uranyl species at trace quantity level. Besides, the SERS intensity was proportional to the variable concentrations of uranyl nitrate ranging from 10-7to 10-3molL-1with an excellent linear relation (R2=0.998), and the detection limit was ~10-7molL-1. Furthermore, the related SERS approach involves low-cost substrate fabrication, rapid and trace analysis simultaneously, and shows great potential applications for the field assays of uranyl ions in the nuclear fuel cycle and environmental monitoring.
authors.affiliation: Institute of Materials, China Academy of Engineering Physics, PO Box 9071-11, Mianyang 621907, China.
authors.forename: Shaofei
authors.initials: S
authors.lastname: Wang
authors.affiliation: Institute of Materials, China Academy of Engineering Physics, PO Box 9071-11, Mianyang 621907, China.
authors.forename: Jiaolai
authors.initials: J
authors.lastname: Jiang
authors.affiliation: Institute of Materials, China Academy of Engineering Physics, PO Box 9071-11, Mianyang 621907, China.
authors.forename: Haoxi
authors.initials: H
authors.lastname: Wu
authors.affiliation: Institute of Materials, China Academy of Engineering Physics, PO Box 9071-11, Mianyang 621907, China.
authors.forename: Jianping
authors.initials: J
authors.lastname: Jia
authors.affiliation: Institute of Materials, China Academy of Engineering Physics, PO Box 9071-11, Mianyang 621907, China.
authors.forename: Lang
authors.initials: L
authors.lastname: Shao
authors.affiliation: Institute of Materials, China Academy of Engineering Physics, PO Box 9071-11, Mianyang 621907, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Tang
authors.affiliation: Institute of Materials, China Academy of Engineering Physics, PO Box 9071-11, Mianyang 621907, China.
authors.forename: Yiming
authors.initials: Y
authors.lastname: Ren
authors.affiliation: Institute of Materials, China Academy of Engineering Physics, PO Box 9071-11, Mianyang 621907, China.
authors.forename: Mingfu
authors.initials: M
authors.lastname: Chu
authors.affiliation: China Academy of Engineering Physics, Mianyang 621900, China. Electronic address: xlwang@caep.cn.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
keywords: Adsorption mechanism; SERS; Self-assembly; Trace analysis; Uranyl(VI)