Fussy nanofibrous network of polyaniline (PANi) for NH3 detection

• Published in: Synthetic metals 2012-12, Vol.162 (21-22), p.1822-1827
• Main Authors: Khuspe, G.D., Bandgar, D.K., Sen, Shashwati, Patil, V.B.
• Format: Article
• Language: English
• Subjects: Application fields; Applied sciences; Exact sciences and technology; FESEM; Fuzzy nanofibrous network; NH3 sensor; Polyaniline; Polymer industry, paints, wood; Technology of polymers
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2012.08.022

[Display omitted] ► Novel and facile route for fabrication of polyaniline sensor. ► Fussy nanofibrous NH3 sensor operating at room temperature. ► Polyaniline had high sensor response (96%) and stability (96.88%) to NH3. Fuzzy nanofibrous network of polyaniline thin film is successfully synthesized for ammonia gas detection application. The nanofiber network of polyaniline thin film is characterized using Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscope (FESEM), transmission electron microscope and optical absorption studies. Network of polyaniline is highly porous with interconnected fuzzy nanofibers having diameter typically between 70 and 75nm. The gas sensing properties of polyaniline film are tested at room temperature (300K). The PANi sensor showed selectivity for NH3 over H2S compared to NO2 (SNH3/SH2S=48 and SNH3/SNO2=24). The maximum gas response of 96% was achieved with 96.88% stability for PANi films upon exposure of 100ppm NH3 at room temperature. The response and recovery times changed significantly with the NH3 concentration. The increased NH3 concentration affected the response and recovery times; the response time decreases from 427 to 122s with an increase in recovery time from 180 to 1245s.