Porous screen printed indium tin oxide (ITO) for NO_x gas sensing

Abstract

Tin-doped Indium Oxide (ITO) films were prepared by the screen printing method. Transparent and conductive ITO thin films were obtained from an organometallic based paste fired in an Infrared furnace. The Screen printed ITO films were found to be granular and porous. This specific morphology was found to be suitable for sensing different gaseous species. This work investigates the possibility of using screen printed (ITO) films as a specific material for efficient NO x gas sensing. It was found that screen printed ITO is highly sensitive and stable towards NO x , especially for gas concentration higher than 50 ppm and starting from a substrate working temperature of about 180 °C. The sensitivity of the ITO films increases with increasing NO x concentration and temperature. The sensitivity and stability of the screen printed ITO based sensors were studied within time. The ITO crystallite grain size dimension was found to be a key parameter that influencesè the gas response characteristics. Maximum gas sensitivity and minimum response time were observed for ITO films having lower crystallite size dimensions.

Infrared absorbing nanoparticle impregnated self-heating fabrics for significantly improved moisture management under ambient conditions

“…8: 202222 characteristics of ITO, specifically in the near IR region. Similar absorption characteristics of ITO have been previously reported and used in various applications such as energy conversion and storage [16], sensing [17,18], localized surface plasmon resonance [19,20], photovoltaics [21], biomolecular detection [22] as well as textile-based applications [23,24] etc. Figure 1d shows the XRD pattern obtained for ITO nanoparticles, indicating the crystallographic features labelled on the diagram, which are in good agreement with those previously reported in the literature [19,25].…”

Gas sensing at the nanoscale: engineering SWCNT-ITO nano-heterojunctions for the selective detection of NH3 and NO2 target molecules

“…Combination of ITO and CNTs has been studied as nanocomposite for organic light emitting diode [58] or solar cell applications [4], but little attention has been paid to gas sensing. The gas sensing properties of ITO layers to detect many polluting gases (ammonia [59], CO [60], NOx [61], methanol [62]), as well as in nanoparticle form to detect ethanol at 200 °C [63], have been demonstrated. ITO NP have not been very much considered in CNT-SMOX nanoparticle hybrid junctions, as most of the NP so far used in this kind of heterojunctions are TiO 2 [46], SnO 2 [47], and WO 3 [48].…”

Disposable Screen Printed Electrochemical Sensors: Tools for Environmental Monitoring

“…The symptoms of nitrogen oxide poising appear several hours after its inhalation and require sensitive methods to detect it at low levels. Tin-doped and indium oxide thin films on screen printed electrodes have been used for the detection of nitrogen oxide in the air samples [132,133]. Volatile organic compounds including formaldehyde, acetone and methanol pose harmful effects to human health and contaminate the environment.…”