title: A facile one-pot method to synthesize ultrasmall core-shell superparamagnetic and upconversion nanoparticles.
abstract: Ultrasmall core-shell Fe3O4@NaYF4:Yb(3+)/Er(3+) nanoparticles with bifunctional properties have been successfully synthesized via one pot thermolysis method using oleylamine as both solvent and stabilizer. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), upconversion (UC) luminescence spectra and the physical properties measurement system (PPMS) were used to characterize the resulting samples. The synthesized samples have uniform morphology with a mean size of 14.5nm and excellent dispersibility. Moreover, these nanoparticles exhibit superparamagnetic behaviour with saturation magnetization of 8.45emμ/g and efficient up-conversion emission with a two-photon induced process when excited by a 980nm laser. These results suggest that the synthesized ultrasmall bifunctional nanoparticles may find many biomedical applications, such as clinical diagnosis and treatment of cancers.
authors.affiliation: School of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, PR China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Cheng
authors.affiliation: School of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, PR China.
authors.forename: Hongxuan
authors.initials: H
authors.lastname: Guo
authors.affiliation: College of Science, Northeast Forestry University, Harbin 150040, PR China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, PR China. Electronic address: liushouxin@126.com.
authors.forename: Shouxin
authors.initials: S
authors.lastname: Liu
authors.affiliation: National Key Laboratory of Materials Behaviours & Evaluation Technology in Space Environments, Harbin Institute of Technology, Harbin 150001, PR China. Electronic address: suijiehe@hit.edu.cn.
authors.forename: Jiehe
authors.initials: J
authors.lastname: Sui
authors.affiliation: National Key Laboratory of Materials Behaviours & Evaluation Technology in Space Environments, Harbin Institute of Technology, Harbin 150001, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Cai
mesh_terms: D004871:Erbium / Q000737:chemistry*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012964:Sodium / Q000737:chemistry*; D013499:Surface Properties; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*
chemical_list: D058185:Magnetite Nanoparticles; D015019:Yttrium; D004871:Erbium; D012964:Sodium; D015018:Ytterbium
keywords: Bifunctional nanoparticles; Luminescence; Magnetic materials; Multimodal imaging