Li+-selective optodes-effect of fluoroionophore distribution in mesoporous silica thin films on Li+ response

Yuki Hiruta, Chikai Sato, Youhei Takahashi, Kei Kubobuchi, Yushi Shichi, Daniel Citterio, Koji Suzuki

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This paper describes the development and the characterization of a Li + optical sensor (optode) based on a Li+ selective fluoroionophore (KBL-01-Si), immobilized to a mesoporous silica thin film. KBL-01-Si was synthesized by the formation of a urethane bond between the hydroxyl terminated alkoxy chain of KBL-01 and 3-isocyanatopropyl- triethoxysilane. Li+ optodes with different amounts of KBL-01-Si fluoroionophore were fabricated by changing the grafting time of KBL-01-Si to mesoporous silica thin films with two different pore sizes. When the concentration of KBL-01-Si immobilized to the pore surface of the mesoporous silica thin films was low, response curves following a theoretical 1:1 complex formation equilibrium with binding constants for Li+ (log K) between 4.38 and 5.04 were observed. At higher concentrations of immobilized fluoroionophore, the response curves deviated from the fitting curve based on a theoretical chemical equilibrium, and the dynamic response was extended over a broad range from 10-6 to 1 M. In addition, it was observed by XPS depth profiling that KBL-01-Si was mainly localized on pore surface areas close to the channel entrances. These results indicate that not only the design of the fluoroionophore, but also the matrix for immobilization, and the microscale distribution of the fluoroionophore affect the characteristics of an ion sensor.

Original languageEnglish
Pages (from-to)6499-6506
Number of pages8
JournalRSC Advances
Volume3
Issue number18
DOIs
Publication statusPublished - 2013 May 14

Fingerprint

Silicon Dioxide
Silica
Thin films
Depth profiling
Urethane
Optical sensors
Curve fitting
Hydroxyl Radical
Pore size
Dynamic response
X ray photoelectron spectroscopy
Ions
Sensors
(3-isocyanatopropyl) triethoxysilane
alkoxyl radical

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Li+-selective optodes-effect of fluoroionophore distribution in mesoporous silica thin films on Li+ response. / Hiruta, Yuki; Sato, Chikai; Takahashi, Youhei; Kubobuchi, Kei; Shichi, Yushi; Citterio, Daniel; Suzuki, Koji.

In: RSC Advances, Vol. 3, No. 18, 14.05.2013, p. 6499-6506.

Research output: Contribution to journalArticle

Hiruta, Yuki ; Sato, Chikai ; Takahashi, Youhei ; Kubobuchi, Kei ; Shichi, Yushi ; Citterio, Daniel ; Suzuki, Koji. / Li+-selective optodes-effect of fluoroionophore distribution in mesoporous silica thin films on Li+ response. In: RSC Advances. 2013 ; Vol. 3, No. 18. pp. 6499-6506.
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