title: Thermosensitive and pH-sensitive Au-Pd bimetallic nanocomposites.
abstract: The bimetallic nanoparticles were protected by a double stimuli-sensitive diblock copolymer, poly(N-isopropylacrylamide)-block-poly(4-vinylpyridine) (PNIPAM-b-P4VP), which was synthesized via the reversible addition-fragmentation chain transfer (RAFT) polymerization. The obtained nanocomposites were made up of bimetallic nanoparticles cross-linked P4VP core and PNIPAM shell. Energy-dispersive X-ray (EDX) spectra and UV-vis transmittance revealed the formed nanoparticles was truly bimetallic particles with incomplete core-shell structures, Au as core and Pd as shell, rather than the physical mixture of monometallic nanoparticles. Laser light scattering (LLS) demonstrated the nanocomposites exhibit both thermo and pH sensitivity. X-ray diffraction (XRD) clearly showed Au formed a high-ordered crystal while Pd fashioned amorphous aggregates. In addition, the bimetallic nanocomposites show special responsiveness for temperature and better catalytic activity than corresponding monometallic nanocomposites.
authors.affiliation: Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China.
authors.forename: Dongyun
authors.initials: D
authors.lastname: Zhao
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Chenglin
authors.initials: C
authors.lastname: Wu
authors.forename: Rujiang
authors.initials: R
authors.lastname: Ma
authors.forename: Yingli
authors.initials: Y
authors.lastname: An
authors.forename: Linqi
authors.initials: L
authors.lastname: Shi
mesh_terms: D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D053761:Nanocomposites / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D013057:Spectrum Analysis; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D010165:Palladium; D006046:Gold