Novel fluorescence sensor based on covalent immobilization of 3-amino-9-ethylcarbazole via electrostatically assembled gold nanoparticle layer

  • Shu-zhen Tan (谭淑珍)Email author
  • Shu Long (龙 姝)
  • Jiao-yun Xia (夏姣云)
  • Zhong Cao (曹 忠)
  • Ling Zhang (张 玲)
  • Fu-chun Gong (龚福春)


A novel technique of immobilizing indicator dyes by electrostatic adsorption and covalent bonding to fabricate optical sensors was developed. 3-Amino-9-ethylcarbazole (AEC) was attached to the outmost surface of quartz glass slide via aminosilanizing the slide, crosslinking chitosan, adsorbing Au nanoparticle, self-assembling HS(CH2)11OH, and coupling AEC. Thus, an AEC-immobilized optical sensor was obtained. The sensor exhibits a wide linear response range from 7.0×10−7 to 1.0×10−4 mol/L and a correlation coefficient of 0.995 9 for the detection of 2-nitrophenol. The detection limit and response time of the sensor are 1.0×10−7 mol/L and less than 10 s, respectively. The fluorescence intensity of the used sensor can be restored to the blank value by simply rinsing with blank buffer. A very effective matrix for immobilizing indicator dye is provided by the proposed technique, which is adaptable to other indicator dyes with amino groups besides AEC.

Key words

optical sensor chitosan Au nanoparticle 3-amino-9-ethylcarbazole 2-nitrophenol indicator dye 


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Copyright information

© Central South University Press and Springer-Verlag GmbH 2009

Authors and Affiliations

  • Shu-zhen Tan (谭淑珍)
    • 1
    Email author
  • Shu Long (龙 姝)
    • 1
  • Jiao-yun Xia (夏姣云)
    • 1
  • Zhong Cao (曹 忠)
    • 1
  • Ling Zhang (张 玲)
    • 1
  • Fu-chun Gong (龚福春)
    • 1
  1. 1.School of Chemistry and Biological EngineeringChangsha University of Science and TechnologyChangshaChina

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