title: Preparation of concave magnetoplasmonic core-shell supraparticles of gold-coated iron oxide via ion-reducible layer-by-layer method for surface enhanced Raman scattering.
abstract: Preparation of suprastructure assemblies with unique colloidal and optical properties remains challenging. Non-uniform covering of magnetic nanoparticles (NPs) with an external inert Au shell has been attempted to protect the magnetic core against oxidation as well as to produce multifunctional supraparticles (SPs) possessing respective optical and magnetic properties. In this study, a concave Au NP coating was deposited on magnetic nanoparticles (MNPs) with precise control of the shell thickness and roughness through a layer-by-layer (LbL) assisted ionic reduction method termed ion-reducible LbL (IR-LbL) method. Surface enhanced Raman spectra were obtained using graphene quantum dots (GQDs) on the magnetically aligned structure of the prepared core-shell SPs. It is probable that this synthesis method and the generated SPs are essential for characterizing the merge of electronics and magnetism in the nano-regime and may be applicable for further electronics, magnetic storage, and biomedical applications.
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, Republic of Korea.
authors.forename: Dong Kyu
authors.initials: DK
authors.lastname: Lee
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, Republic of Korea.
authors.forename: Younseong
authors.initials: Y
authors.lastname: Song
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, Republic of Korea.
authors.forename: Van Tan
authors.initials: VT
authors.lastname: Tran
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, Republic of Korea.
authors.forename: Jeonghyo
authors.initials: J
authors.lastname: Kim
authors.affiliation: Graduate School of Science and Technology, Shizuoka University, 836 Ohya Suruga-ku, Shizuoka 422-8529, Japan.
authors.forename: Enoch Y
authors.initials: EY
authors.lastname: Park
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, Republic of Korea. Electronic address: jaebeom@pusan.ac.kr.
authors.forename: Jaebeom
authors.initials: J
authors.lastname: Lee
keywords: Core-shell; Fe(3)O(4)@Au nanoparticles; Layer-by-layer; Magnetoplasmonic; Supraparticles; Suprastructure