title: In-situ one-step synthesis of carbon-encapsulated naked magnetic metal nanoparticles conducted without additional reductants and agents.
abstract: C-encapsulated highly pure Ni, Co, and Fe magnetic nanoparticles (MNPs/C) were synthesized by an innovative one-step in-situ plasma in liquid method (solution plasma processing, SPP) without any additional reductants, agents, or treatment. Successful encapsulation of MNPs was demonstrated by using inductively coupled plasma-atomic emission spectrometry and cyclic voltammetry techniques. The obtained X-ray diffraction patterns and transmission electron microscopy images corresponded to MNPs with average diameters of 5 nm and good crystalline structure. The C capsules with spherical shapes (containing onion-like layers) were characterized by uniform sizes (ranging from 20 nm to 30 nm) and chain-like morphologies. The synthesized MNPs/C exhibited superparamagnetic properties at room temperature and might be utilized in data storage, biomedical, and energy applications since various NPs (including bimetallic ones) could be easily prepared by changing working electrodes. This study shows the potential of SPP to be a candidate for the next-generation synthesis method of NPs/C.
authors.affiliation: Division of Marine Engineering, Korea Maritime and Ocean University, Busan 606-791, Korea.
authors.forename: Jun
authors.initials: J
authors.lastname: Kang
authors.affiliation: Division of Marine Mechatronics, Mokpo National Maritime University, Mokpo 58628, Korea.
authors.forename: Yeonwon
authors.initials: Y
authors.lastname: Kim
authors.affiliation: Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan.
authors.forename: Hye-Min
authors.initials: HM
authors.lastname: Kim
authors.affiliation: College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
authors.forename: Xiulan
authors.initials: X
authors.lastname: Hu
authors.affiliation: Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan.
authors.forename: Nagahiro
authors.initials: N
authors.lastname: Saito
authors.affiliation: Division of Marine Engineering, Korea Maritime and Ocean University, Busan 606-791, Korea.
authors.forename: Jae-Hyuk
authors.initials: JH
authors.lastname: Choi
authors.affiliation: Division of Marine Engineering, Korea Maritime and Ocean University, Busan 606-791, Korea.
authors.forename: Myeong-Hoon
authors.initials: MH
authors.lastname: Lee