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Updated: Jul 23, 2026

A Polyaniline-based Sensor of Nucleic Acids
Published on: November 1, 2016
Room temperature hydrogen sensor made of polyaniline-grafted film
Masanobu Matsuguchi1, Kaito Horio1, Hayato Uchida1
1Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3-Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan.
Abstract:
A hydrogen gas sensor was developed using a polyaniline (PANI)-grafted film as the sensing layer. The sensing layer was fabricated via two procedures: primary doping and secondary doping. Among the fabricated sensors, the high-resistance g-PANI(2nd-H2SO4) sensor-prepared via the secondary doping method using H2SO4 as the secondary dopant-exhibited the highest response value of 74 toward 4000 ppm of dry H2 at 30 °C. The response time was only 30 s, which is remarkably fast and practical for room-temperature operation. To suppress the influence of humidity, a water-resistant layer composed of polystyrene (PSt) microspheres was applied to the surface of the PANI-grafted sensing layer. The optimal concentration of the PSt microsphere solution for forming an effective water-resistant layer was 30 wt%. At this concentration, the relative response at 50% relative humidity (Sw) compared with that under dry conditions (Sd)-expressed as the 100 × Sw/Sd ratio-reached 80%, indicating effective suppression of humidity effects. Moreover, the PSt microsphere layer also suppresses the response to NH3 effectively.
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