Surface modifications of functional electrodes of a light addressable potentiometric sensor (LAPS): Non-dependency of pH sensitivity on the surface functional group

Yasuo Yoshimi, Takehisa Matsuda, Yoshitaka Itoh, Fukashi Ogata, Teruaki Katsube

研究成果: Article査読

8 被引用数 (Scopus)

抄録

To achieve a functional surface design on the electrode of a light addressable potentiometric sensor (LAPS), two different surface modification techniques were adopted to determine the effect of surface functional groups on the sensitivity and reliability of the LAPS. One was chemisorption of alkanethiols (HS-(CH2)n-X, n is 2 or 11, X is CH3, COOH or NH2) on a gold-deposited electrode, and the other was photochemical immobilization of copolymers containing benzophenone and functional groups of CON(CH3)2, COOH and N(CH3)2 in their side chains on a propyltrimethoxysilane-treated electrode. Linearity was observed between the potentials of inflection points on photocurrent-potential curves (Vpip) and the pH of the contacting solution: Vpip = a - b · pH. Gold deposition on the electrode reduced both the pH sensitivity of the Vpip and the degree of linearity of relationship between Vpip and pH. The alkanethiol chemisorption on the gold surface hardly changed the Vpip-pH relationship irrespective of the terminal functional groups of the alkanethiols, Neither the propyltrimethoxysilane treatment nor the photogel immobilizations changed the pH sensitivities of the Vpip or the linearities between Vpip and at pH 3-8. In conclusion, gold deposition is not suitable for modification of the LAPS electrode, while surface modification with photogel immobilization of a propyltrimethoxysilane-treated electrode can be used without reducing the pH sensitivity or reliability.

本文言語English
ページ(範囲)131-139
ページ数9
ジャーナルMaterials Science and Engineering C
5
2 C
DOI
出版ステータスPublished - 1997 12月
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

フィンガープリント

「Surface modifications of functional electrodes of a light addressable potentiometric sensor (LAPS): Non-dependency of pH sensitivity on the surface functional group」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル