热敏和pH敏感的金-钯双金属纳米复合材料。

Thermosensitive and pH-sensitive Au-Pd bimetallic nanocomposites.

作者信息

Zhao Dongyun, Chen Xi, Liu Yang, Wu Chenglin, Ma Rujiang, An Yingli, Shi Linqi

机构信息

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

出版信息

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

DOI:10.1016/j.jcis.2008.11.041

PMID:19100558

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.

摘要

双金属纳米颗粒由一种双刺激敏感的二嵌段共聚物聚（N-异丙基丙烯酰胺）-嵌段-聚（4-乙烯基吡啶）（PNIPAM-b-P4VP）保护，该共聚物通过可逆加成-断裂链转移（RAFT）聚合反应合成。所制备的纳米复合材料由交联P4VP核和PNIPAM壳的双金属纳米颗粒组成。能量色散X射线（EDX）光谱和紫外-可见透射率表明，所形成的纳米颗粒是真正的具有不完全核壳结构的双金属颗粒，以金为核、钯为壳，而不是单金属纳米颗粒的物理混合物。激光光散射（LLS）表明该纳米复合材料具有热和pH敏感性。X射线衍射（XRD）清楚地表明金形成了高阶晶体，而钯形成了无定形聚集体。此外，双金属纳米复合材料对温度表现出特殊的响应性，并且比相应的单金属纳米复合材料具有更好的催化活性。