Functionalization of mesoporous silica membrane with a Schiff base fluorophore for Cu(II) ion sensing

Xiaotong Chen, Akira Yamaguchi, Manato Namekawa, Toshio Kamijo, Norio Teramae, Aijun Tong

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


A Schiff base (SB) immobilized hybrid mesoporous silica membrane (SB-HMM) was prepared by immobilizing a Schiff base onto the pore surface of mesoporous silica (pore size=3.1nm) embedded in the pores of a porous anodic alumina membrane. In contrast to the non-fluorescent analogous SB molecule in homogeneous solutions, SB-HMM exhibited intense fluorescence due to emission enhancement caused by aggregation of SB groups on the pore surface. The high quantum efficiency of the surface SB groups allows SB-HMM to function as a fluorescent sensor for Cu(II) ions in an aqueous solution with good sensitivity, selectivity and reproducibility. Under the optimal conditions described, the linear ranges of fluorescence intensity for Cu(II) are 1.2-13.8(M (R2=0.993) and 19.4-60 (R2=0.992) (M. The limit of detection for Cu(II) is 0.8μM on basis of the definition by IUPAC (CLOD=3.3Sb/m).

Original languageEnglish
Pages (from-to)94-100
Number of pages7
JournalAnalytica Chimica Acta
Issue number1-2
Publication statusPublished - 2011 Jun 24


  • Aggregation-induced emission enhancement
  • Cu(II) detection
  • Mesoporous silica
  • Schiff base

ASJC Scopus subject areas

  • Biochemistry
  • Analytical Chemistry
  • Spectroscopy
  • Environmental Chemistry


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