title: An ordered array of hierarchical spheres for surface-enhanced Raman scattering detection of traces of pesticide.
abstract: An ordered array of hierarchically-structured core-nanosphere@space-layer@shell-nanoparticles has been fabricated for surface-enhanced Raman scattering (SERS) detection. To fabricate this hierarchically-structured chip, a long-range ordered array of Au/Ag-nanospheres is first patterned in the nano-bowls on the planar surface of ordered nanoporous anodic titanium oxide template. A ultra-thin alumina middle space-layer is then conformally coated on the Au/Ag-nanospheres, and Ag-nanoparticles are finally deposited on the surface of the alumina space-layer to form an ordered array of Au/Ag-nanosphere@Al2O3-layer@Ag-nanoparticles. Finite-difference time-domain simulation shows that SERS hot spots are created between the neighboring Ag-nanoparticles. The ordered array of hierarchical nanostructures is used as the SERS-substrate for a trial detection of methyl parathion (a pesticide) in water and a limit of detection of 1 nM is reached, indicating its promising potential in rapid monitoring of organic pollutants in aquatic environment.
authors.affiliation: Key Laboratory of Materials Physics, CAS Center for Excellence in Nanoscience and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui, 230031, People's Republic of China.
authors.forename: Xiaoye
authors.initials: X
authors.lastname: Hu
authors.forename: Peng
authors.initials: P
authors.lastname: Zheng
authors.forename: Guowen
authors.initials: G
authors.lastname: Meng
authors.forename: Qing
authors.initials: Q
authors.lastname: Huang
authors.forename: Chuhong
authors.initials: C
authors.lastname: Zhu
authors.forename: Fangming
authors.initials: F
authors.lastname: Han
authors.forename: Zhulin
authors.initials: Z
authors.lastname: Huang
authors.forename: Zhongbo
authors.initials: Z
authors.lastname: Li
authors.forename: Zhaoming
authors.initials: Z
authors.lastname: Wang
authors.forename: Nianqiang
authors.initials: N
authors.lastname: Wu