title: Functionalization of mesoporous silica membrane with a Schiff base fluorophore for Cu(II) ion sensing.
abstract: 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=3.1 nm) 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 (R(2)=0.993) and 19.4-60 (R(2)=0.992) (M. The limit of detection for Cu(II) is 0.8 μM on basis of the definition by IUPAC (C(LOD)=3.3S(b)/m).
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai, Miyagi Prefecture, Japan.
authors.forename: Xiaotong
authors.initials: X
authors.lastname: Chen
authors.forename: Akira
authors.initials: A
authors.lastname: Yamaguchi
authors.forename: Manato
authors.initials: M
authors.lastname: Namekawa
authors.forename: Toshio
authors.initials: T
authors.lastname: Kamijo
authors.forename: Norio
authors.initials: N
authors.lastname: Teramae
authors.forename: Aijun
authors.initials: A
authors.lastname: Tong