Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 93, Issue -, Pages 95-99Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2018.06.015
Keywords
Nanopipette; Ion current rectification; Customizable pH response; Silanization
Categories
Funding
- National Key Research and Development Program of China [2017YFA0700402, 2018YFB1105100]
- Applied Basic Research Program of Wuhan City [2016060101010048]
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This study shows that it is possible to customize the ion-current-rectification (ICR)-based pH response in glass nanopipettes by adjusting the ratio of 3-aminopropyldimethylethoxysilane (APTES) and (3-triethoxysilylpropyl) succinic acid anhydride (TESP-SA) used in silanization. The silanization time and concentration were optimized by investigating the rectification ratio of the nanopipettes. For each APTES/TESP-SA silane ratio, analysis of variance (ANOVA) tests indicated that the rectification ratio of the nanopipette had good linearity in the pH range 3-8. Moreover, nanopipettes silanized with equal concentrations of amino and carboxylic groups gave the highest pH response of 1.06x10(-4) pH(-1). This method for customizing the ICR-based pH response in nanopipettes has the potential and versatility to be used in applications such as mimicking biological ion channels and developing nanosized pH sensing devices.
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