| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1273975 | International Journal of Hydrogen Energy | 2014 | 13 Pages |
•A grill-like nanostructure for polyaniline-emeraldine.•A polyaniline/TiO2 nanocomposite with a porous cylindrical morphology is made of encapsulated anatase TiO2 grains with Pani fibers.•A high sensitivity, low response/recovery time in different vol% hydrogen gas at ambient conditions.•A good Long-term response.•A nonlinear ohmic current versus voltage.
Polyaniline (emeraldine)/anatase TiO2 nanocomposite (PA-NC) was prepared by a chemical oxidative polymerization. The thin films of PA-NC for hydrogen gas sensing application were deposited on Cu-interdigited electrodes by spin coating technique. A study on characteristics of PA-NC thin films was demonstrated by a porous cylindrical morphology. The response and response/recovery time of sensors for hydrogen gas were evaluated by the change of TiO2 wt% at environmental conditions. Resistance-sensing measurement was exhibited a high sensitivity about 1.63, a good Long-term response, low response time and recovery time about 83 s and 130 s, respectively, at 0.8 vol% hydrogen gas for PA-NC including 25% wt of anatase nanoparticles. The current–voltage characteristics of PA-NC gas sensors before and after hydrogen gas injection showed a nonlinear ohmic current. Moreover, we studied the formation of PA-NCs and their hydrogen gas sensing mechanism based on contact regions in PA-NC.
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