Understanding mercapto ligand exchange on the surface of FePt nanoparticles

被引:147
作者
Bagaria, Hitesh G.
Ada, Earl T.
Shamsuzzoha, Mohammed
Nikles, David E.
Johnson, Duane T. [1 ]
机构
[1] Univ Alabama, Dept Chem & Biol Engn, Tuscaloosa, AL 35487 USA
[2] Univ Alabama, Cent Analyt Facil, Tuscaloosa, AL 35487 USA
[3] Univ Alabama, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
[4] Univ Alabama, Dept Chem, Tuscaloosa, AL 35487 USA
关键词
D O I
10.1021/la0601399
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Tailoring the surface of nanoparticles is essential for biological applications of magnetic nanoparticles. FePt nanoparticles are interesting candidates owing to their high magnetic moment. Established procedures to make FePt nanoparticles use oleic acid and oleylamine as the surfactants, which make them dispersed in nonpolar solvents such as hexane. As a model study to demonstrate the modification of the surface chemistry, stable aqueous dispersions of FePt nanoparticles were synthesized after ligand exchange with mercaptoalkanoic acids. This report focuses on understanding the surface chemistry of FePt upon ligand exchange with mercapto compounds by conducting X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) studies. It was found that the mercapto end displaces oleylamine on the Pt atoms and the carboxylic acid end displaces the oleic acid on the Fe atoms, thus exposing carboxylate and thiolate groups on the surface that provide the necessary electrostatic repulsion to form stable aqueous dispersions of FePt nanoparticles.
引用
收藏
页码:7732 / 7737
页数:6
相关论文
共 29 条
  • [1] Functionalisation of magnetic nanoparticles for applications in biomedicine
    Berry, CC
    Curtis, ASG
    [J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2003, 36 (13) : R198 - R206
  • [2] Chemical derivatization of self-assembled 3-mercaptopropionic and 16-mercaptohexadecanoic acids at platinum surfaces with 3-aminopropyltrimethoxysilane: a spectroscopic and electrochemical study
    Brito, R
    Tremont, R
    Feliciano, O
    Cabrera, CR
    [J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2003, 540 : 53 - 59
  • [3] One-step synthesis of FePt nanoparticles with tunable size
    Chen, M
    Liu, JP
    Sun, SH
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (27) : 8394 - 8395
  • [4] Gold nanoparticles: Assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology
    Daniel, MC
    Astruc, D
    [J]. CHEMICAL REVIEWS, 2004, 104 (01) : 293 - 346
  • [5] Elkins KE, 2003, NANO LETT, V3, P1647, DOI 10.1021/nl034743w
  • [6] SURFACE CHARACTERIZATION OF CARBON-FIBERS USING ANGLE-RESOLVED XPS AND ISS
    GARDNER, SD
    SINGAMSETTY, CSK
    BOOTH, GL
    HE, GR
    PITTMAN, CU
    [J]. CARBON, 1995, 33 (05) : 587 - 595
  • [7] Synthesis and surface engineering of iron oxide nanoparticles for biomedical applications
    Gupta, AK
    Gupta, M
    [J]. BIOMATERIALS, 2005, 26 (18) : 3995 - 4021
  • [8] HAFELI U, 2005, J MAGN MAGN MATER, V293, P1
  • [9] Surface PEGylation and ligand exchange chemistry of FePt nanoparticles for biological applications
    Hong, R
    Fischer, NO
    Emrick, T
    Rotello, VM
    [J]. CHEMISTRY OF MATERIALS, 2005, 17 (18) : 4617 - 4621
  • [10] Structure and mechanism of photooxidation of self-assembled monolayers of alkylthiols on silver studied by XPS and static SIMS
    Hutt, DA
    Cooper, E
    Leggett, GJ
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (01): : 174 - 184