Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (6): 73-78,120.doi: 10.3969/j.issn.1000-565X.2014.06.012

• Materials Science & Technology • Previous Articles     Next Articles

Relationship Between Size as Well as Size Distribution and Fluorescence Properties of CMC/Eu Complex Nanoparticles Synthesized at Different pH Values

Ye Jun1,2 Li Wen- hao1,2 Xiong Jian2   

  1. 1.State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;2.School of Light Chemistry and Food Sciences,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2014-01-27 Revised:2014-04-01 Online:2014-06-25 Published:2014-05-01
  • Contact: 熊犍(1965-)，男，博士，教授，主要从事纤维素及其他天然高分子结构与性能研究． E-mail:lcjxiong@scut.edu.cn
  • About author:叶君(1963-)，女，博士，教授，主要从事植物资源化学研究．E-mail:jye@scut．edu．cn
  • Supported by:

    国家 “973” 计划项目(2010CB732201);国家自然科学基金资助项目(31270617)

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Abstract:

In this paper,CMC/Eu complex nanoparticles were synthesized at different pH values by the reaction of Eu 3 + and biodegradable carboxymethyl cellulose (CMC). FT- IR results confirm that the carboxyl groups on CMCchains,the oxygen atoms of unsubstituted hydroxyl groups and the oxygen atoms of ether bonds all involve in thereaction with Eu 3 + .SEM and TEM results show that the synthesized CMC/Eu particles are in a nanoscale andpresent weak polycrystalline structure.Solid UV- Vis absorption spectra show that CMC is a good energy donor andfluorescent sensitizer.Moreover,it is found that there is a strong dependence of particle size and distribution on thefluorescence properties of CMC/Eu nanoparticles,and that pH value greatly affects the particle size,the particlesize distribution and the fluorescence properties; for instance,the sample synthesized at pH 7 is of the smallest par-ticle size (150 ～200nm),the most uniform size distribution,the strongest fluorescence intensity and high fluores-cence monochromaticity,and,with the increase of pH value,the nanoparticles aggregate more seriously,the particlesize increases,and the fluorescence intensity accordingly reduces.All these findings reflect the quantum size effect.

Key words: CMC/Eu complex nanoparticle, particle size, particle size distribution, fluorescence property, pH value