Synthesis of bimetallic platinum nanoparticles for biosensors.
The use of magnetic nanomaterials in biosensing applications is growing as a consequence of their remarkable properties; but controlling the composition and shape of metallic nanoalloys is problematic when more than one precursor is required for wet chemistry synthesis. We have developed a successful simultaneous reduction method for preparation of near-spherical platinum-based nanoalloys containing magnetic solutes. We avoided particular difficulties in preparing platinum nanoalloys containing Ni, Co and Fe by the identification of appropriate synthesis temperatures and chemistry. We used transmission electron microscopy (TEM) to show that our particles have a narrow size distribution, uniform size and morphology, and good crystallinity in the as-synthesized condition. Energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) confirms the coexistence of Pt with the magnetic solute in a face-centered cubic (FCC) solid solution.
Centre for Materials Engineering, Department of Mechanical Engineering, University of Cape Town, Rondebosch 7701, South Africa. gerard.leteba@uct.ac.za
Gerard M
GM
Leteba
Candace I
CI
Lang
D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000138:chemical synthesis*; D015374:Biosensing Techniques / Q000379:methods*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*
D000497:Alloys; D001672:Biocompatible Materials; D058185:Magnetite Nanoparticles; D010984:Platinum