期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 5, 页码 1515-1523出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14171c
关键词
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资金
- National Key Basic Research Program of China (973 Program) [2011CB707905, 2013CB933200]
- China National Funds for Distinguished Young Scientists [51225202]
- National Natural Science Foundation of China [51132009, 51072212, 51102259, 51372260, 51302293, 81371570]
- Nano special program of the Science and Technology Commission of Shanghai [11nm0506500, 11nm0505000]
- Shanghai Rising-Star Program [12QH1402500]
- Development Foundation for Talents of Shanghai [2012035]
- Natural Science Foundation of Shanghai [13ZR1463500]
- Samsung GRO Project Subject of Samsung Advanced Institute of Technology
A useful and interesting unconventional phenomenon of Pd nanoparticle formation, i.e., significantly inhibited particle growth at elevated temperatures, has been observed for the first time by growing Pd nanoparticles on a type of nonreactor, amino group-functionalized hollow mesoporous silica nanoparticles (amino-HMSNs). Such an unconventional effect is evidenced to be a competitive result between temperature-dependent coordination and reduction action of amino groups on the shell of HMSNs based on a series of experiments of probing the coordination and reduction capability of the amino groups to a Pd precursor K2PdCl6. A possible mechanism has been proposed to demonstrate and clarify the unconventional growth of Pd nanoparticles on the shell of amino-HMSNs. The as-synthesized Pd nanoparticles on the amino-HMSNs, therefore, show a tunable temperature-dependent small size range (<10 nm) and high dispersity, and can be used as efficient Heck reaction catalysts. Such a finding of unconventional particle growth effect may offer a novel protocol for particle size modulation during materials design and fabrication.
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