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J Colloid Interface Sci. 2009 Mar 1;331(1):104-12. doi: 10.1016/j.jcis.2008.11.041. Epub 2008 Nov 24.

Thermosensitive and pH-sensitive Au-Pd bimetallic nanocomposites.

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  • 1Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China.


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.

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