title: Controlled fabrication of silver nanoneedles array for SERS and their application in rapid detection of narcotics.
abstract: Novel surface-enhanced Raman scattering (SERS) substrates with high SERS-activity are ideal for novel SERS sensors, detectors to detect illicitly sold narcotics and explosives. The key to the wider application of SERS technique is to develop plasmon resonant structure with novel geometries to enhance Raman signals and to control the periodic ordering of these structures over a large area to obtain reproducible Raman enhancement. In this work, a simple Ar(+)-ion sputtering route has been developed to fabricate silver nanoneedles arrays on silicon substrates for SERS-active substrates to detect trace-level illicitly sold narcotics. These silver nanoneedles possess a very sharp apex with an apex diameter of 15 nm and an apex angle of 20°. The SERS enhancement factor of greater than 10(10) was reproducibly achieved by the well-aligned nanoneedles arrays. Furthermore, ketamine hydrochloride molecules, one kind of illicitly sold narcotics, can be detected down to 27 ppb by using our SERS substrate within 3 s, indicating the sensitivity of our SERS substrates for trace amounts of narcotics and that SERS technology can become an important analytical technique in forensic laboratories because it can provide a rapid and nondestructive method for trace detection.
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China. yangyong@mail.sic.ac.cn
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Zhi-Yuan
authors.initials: ZY
authors.lastname: Li
authors.forename: Kohei
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: Masaki
authors.initials: M
authors.lastname: Tanemura
authors.forename: Zhengren
authors.initials: Z
authors.lastname: Huang
authors.forename: Dongliang
authors.initials: D
authors.lastname: Jiang
authors.forename: Yuhui
authors.initials: Y
authors.lastname: Chen
authors.forename: Fei
authors.initials: F
authors.lastname: Zhou
authors.forename: Masayuki
authors.initials: M
authors.lastname: Nogami