UV-enhanced NO₂ gas sensing properties of polystyrene sulfonate functionalized ZnO nanowires at room temperature

Abstract

PSS-functionalized ZnO nanowires exhibited a highly sensitive, fast, reversible and stable optoelectronic response to NO2 under UV illumination.

Low-temperature operating ZnO-based NO2 sensors: a review

“…Wang and co-workers also synthesized polystyrene sulfonate (PSS) functionalized ZnO nanowires by hydrothermal method. 135 Through this process, ZnO nanowires with lengths of 20-50 mm and diameters of 50-300 nm obtain high aspect ratio. The sensor shows a higher response (690% to 2 ppm NO 2 ), a low detection limit (5 ppb), excellent reversibility and stability under UV light assist at room temperature.…”

Enhancing visible light-activated NO2 sensing properties of Au NPs decorated ZnO nanorods by localized surface plasmon resonance and oxygen vacancies

“…The response of the ZA-2 sensor falls down with increasing ambient humidity ( figure 7(b)). This is because that the water molecules occupy the adsorption sites of on the surface of ZnO and inhibits the adsorption of O 2 and NO 2 [35,36], shrinking the response of the sensor. Conversely, the adsorption of NO 2 molecules on the sensor surface reaches a saturation state faster when the adsorbed water molecules increase.…”

Photoactivated materials and sensors for NO2 monitoring

“…22/37 Hydrothermal synthesis is one of the favorite methods for the preparation of bare NO 2 photosensitive materials, according to our survey (Table 4). This method, for instance, has been used for the synthesis of ZnO with tuned morphologies including nanobars/tubes [111], nanorods assembled macro/mesoporous film [51], and nanowires [131]. It has also proved the synthesis of other structured materials such as In 2 O 3 nanorods [112] or Sn 2 S 2 nanosheets [113].…”

“…Other one-step procedures involve the self-assembly crystallization method to form Pt-decorated ZnO nanowires [127], seeded growth assisted method to form ZnO nanorods functionalized by Pd nanoparticles [62], and chemical precipitation for achieving Au nanoparticles decorated MoS 2 thin films [39]. Hydrothermal methods also showed feasibility for the one-step synthesis of composites with a variety of morphologies, for example, ZnO-silk fibroin nanomaterials in the form of nanoparticles or micro blocks [132], hexagonal 2D SnS 2 flakes to decorate rGO [70], and polystyrene sulfonate (PSS) functionalized ZnO nanowires [131]. The two-step procedure for the synthesis of composites has also provided a wide variety of materials and morphologies.…”