Fabrication of TiO2/Pt core–shell particles by electroless metal plating

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 448; pp. 88 - 92
• Main Authors: Kobayashi, Yoshio, Ishii, Yuya, Yamane, Hideyuki, Watanabe, Ken-ichi, Koda, Hidekazu, Kunigami, Hiroshi, Kunigami, Hideki
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 20.04.2014
• Subjects: Core–shell; Electroless metal plating; Particles; TiO2; Core–shell; Pt; Electroless metal plating; Particles; TiO2
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2014.02.018

•The present work proposes a simple method for fabricating TiO2/Pt core–shell particles.•TiO2 particles prepared by a sol–gel method were surface-modified with poly(diallyldimethylammonium chloride).•Pt fine particles were pre-deposited on the surface-modified TiO2 particles by reducing Pt ions in the presence of the TiO2 particles.•Pt shells were formed on the Pt-pre-deposited TiO2 particles by electroless metal plating method. An electroless metal plating method was used to form Pt shells on sub-micrometer-sized titania particles fabricated by a sol–gel method. The electroless metal plating method comprised three steps: (1) surface-modification of titania particles with poly(diallyldimethylammonium chloride) (PDADMAC) (TiO2–PDADMAC), (2) pre-deposition of Pt nuclei or Pt fine particles on the titania particles by reducing Pt ions in the presence of TiO2–PDADMAC particles (TiO2–Pt) and (3) growth of the pre-deposited Pt by immersing the TiO2–Pt particles in a Pt-plating solution. TEM observation and X-ray diffractometry revealed that surface modification with PDADMAC promoted the pre-deposition of Pt and that crystalline Pt shells with a thickness of approximately 25nm were successfully produced on the titania particles using initial concentrations of 0.8×10−3M TiO2 and 0.375×10−3M Pt in the Pt-plating solution.