Potassium Iodide-Functionalized Polyaniline Nanothin Film Chemiresistor for Ultrasensitive Ozone Gas Sensing.
Sira SrinivesTapan SarkarRaul HernandezAshok MulchandaniPublished in: Polymers (2017)
Polyaniline (PANI) nanostructures have been widely studied for their sensitivity to atmospheric pollutants at ambient conditions. We recently showed an effective way to electropolymerize a PANI nanothin film on prefabricated microelectrodes, and demonstrated its remarkable sensing performance to be comparable to that of a one-dimensional nanostructure, such as PANI nanowires. In this work, we report further progress in the application of the PANI nanothin film chemiresistive sensor for the detection of ozone (O₃) by modifying the film with potassium iodide (KI). The KI-PANI sensor exhibited an excellent sensitivity to O₃ (8⁻180 ppb O₃ concentration rage) with a limit of detection of 230 ppt O₃, and exquisite selectivity against active chemicals such as nitrogen dioxide (NO₂) and sulfur dioxide (SO₂). The sensing mechanism of the sensor relied on iodometric chemistry of KI and O₃, producing triiodide ( I 3 - ) that partially doped and increased electrical conductivity of the PANI film. The sensitivity and selectivity of the KI-functionalized PANI film demonstrates the potential use for KI-PANI-based O₃ sensing devices in environmental monitoring and occupational safety.
Keyphrases
- reduced graphene oxide
- room temperature
- gold nanoparticles
- particulate matter
- quantum dots
- neoadjuvant chemotherapy
- air pollution
- label free
- hydrogen peroxide
- loop mediated isothermal amplification
- mass spectrometry
- radiation therapy
- ionic liquid
- squamous cell carcinoma
- nitric oxide
- molecularly imprinted
- highly efficient
- high resolution
- solid phase extraction
- real time pcr
- visible light
- tandem mass spectrometry
- simultaneous determination