title: In situ dynamic measurements of the enhanced SERS signal using an optoelectrofluidic SERS platform.
abstract: A novel active surface-enhanced Raman scattering (SERS) platform for dynamic on-demand generation of SERS active sites based on optoelectrofluidics is presented in this paper. When a laser source is projected into a sample solution containing metal nanoparticles in an optoelectrofluidic device and an alternating current (ac) electric field is applied, the metal nanoparticles are spontaneously concentrated and assembled within the laser spot, form SERS-active sites, and enhance the Raman signal significantly, allowing dynamic and more sensitive SERS detection. In this simple platform, in which a glass slide-like optoelectrofluidic device is integrated into a conventional SERS detection system, both dynamic concentration of metal nanoparticles and in situ detection of SERS signal are simultaneously possible with only a single laser source. This optoelectrofluidic SERS spectroscopy allows on-demand generation of 'hot spots' at specific regions of interest, and highly sensitive, reliable, and stable SERS measurements of the target molecules in a tiny volume (∼500 nL) of liquid sample without any fluidic components and complicated systems.
authors.affiliation: Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Hyundoo
authors.initials: H
authors.lastname: Hwang
authors.forename: Dongsik
authors.initials: D
authors.lastname: Han
authors.forename: Young-Jae
authors.initials: YJ
authors.lastname: Oh
authors.forename: Yoon-Kyoung
authors.initials: YK
authors.lastname: Cho
authors.forename: Ki-Hun
authors.initials: KH
authors.lastname: Jeong
authors.forename: Je-Kyun
authors.initials: JK
authors.lastname: Park
mesh_terms: D053768:Metal Nanoparticles / Q000737:chemistry*; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation* / Q000379:methods*