Effect of size of Fe3O4 magnetic nanoparticles on electrochemical performance of screen printed electrode using sedimentation field-flow fractionation

• Published in: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology Vol. 16; no. 10
• Main Authors: Dou, Haiyang, Kim, Beom-Ju, Choi, Seong-Ho, Jung, Euo Chang, Lee, Seungho
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.10.2014; Springer
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Electron and ion emission by liquids and solids; impact phenomena; Exact sciences and technology; Field emission, ionization, evaporation, and desorption; General equipment and techniques; Inorganic Chemistry; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Lasers; Magnetic properties and materials; Materials Science; Nanoscale materials and structures: fabrication and characterization; Nanotechnology; Nanotubes; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Research Paper; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; Small particles and nanoscale materials; Studies of specific magnetic materials; Screen printed electrode; Dopamine; Sedimentation field-flow fractionation; magnetic nanoparticles; Multi-walled carbon nanotubes; Fe; O; Particle size; Carbon nanotubes; Flow pattern; Field emission; XRD; Magnetic nanomaterial; Nanoparticles; Cyclic voltammetry; Size effect; Surface properties; Coprecipitation; Ultrasonic method; Correlation coefficient; pH value; Light scattering; Carbon; Magnetic particles; Electrochemical properties; Transmission electron microscopy; Multiwalled nanotube; Biosensors; X-ray photoelectron spectra
• ISSN: 1388-0764; 1572-896X
• DOI: 10.1007/s11051-014-2679-5

Fe 3 O 4 magnetic nanoparticles (MNPs) and Fe 3 O 4 -deposited multi-walled carbon nanotubes (Fe 3 O 4 @MWCNTs) were synthesized by ultrasonic co-precipitation method. The surface and structural properties of Fe 3 O 4 MNPs and Fe 3 O 4 @MWCNTs were characterized by X-ray diffraction, field emission transmission electron microscopy (FE-TEM), X-ray photoelectron spectroscopy, and dynamic light scattering (DLS). Sedimentation field-flow fractionation (SdFFF) was, for the first time, employed to study the influence of synthesis parameters on size distribution of Fe 3 O 4 MNPs. A reasonable resolution for SdFFF analysis of Fe 3 O 4 MNPs was obtained by a combination of 1,600 RPM, flow rate of 0.3 mL min −1 , and Triton X-100. The results suggest that lower pH and higher reaction temperature tend to yield smaller Fe 3 O 4 MNPs size. The size distribution of Fe 3 O 4 MNPs obtained from SdFFF was compared with those obtained from TEM and DLS. Also the effect of the particle size of Fe 3 O 4 MNPs on electrochemical property of Fe 3 O 4 @MWCNTs-treated screen printed electrode (SPE) was studied. Cyclic voltammetry revealed that SPE treated with MWCNTs yields a significantly enhanced signal than that with no treatment. The SPE signal was even further enhanced with addition of Fe 3 O 4 MNPs. For SPE analysis of dopamine, a liner range of 0.005–0.1 mM with a correlation coefficient of 0.986 was observed. Results revealed that (1) SdFFF is a useful tool for size-based separation and characterization of MNPs; (2) Proposed methods for synthesis of Fe 3 O 4 nanoparticles and Fe 3 O 4 @MWCNTs are mild and fast (about 30 min); (3) SPE treated with Fe 3 O 4 @MWCNTs shows potential applicability for biosensing.