UV-enhanced NO<sub>2</sub> gas sensor based on electrospinning SnO<sub>2</sub>-ZnO composite nanofibers

ZnO quantum dots sensitized SnO2 porous nanowires were fabricated and designed for UV excitation gas sensor. The ZnO/SnO2 composite (SZQ1%) with the molar proportion of 1:100 exhibits excellent sensing properties to NO2 gas under UV irradiation at 40oC. The humidity stability of SZQ1% was also measured and discussed by DC reversed circuit and complex impedance curves. The gas sensing mechanism is well discussed and illustrated to the ZnO quantum dots sensitized and the increased photo-generated carriers under UV irradiation.

show abstract

“…Gas responses to NO 2 gas of sensing materials in the present study and those reported in the literature[13][14][15][16][17].…”

supporting

confidence: 72%

UV-enhanced NO₂ sensor using ZnO quantum dots sensitized SnO₂ porous nanowires

2022

View full text Add to dashboard Cite

show abstract

“…In the last case, once the calcination is performed, the metal oxide crystalline structure will be formed by incorporating the metallic nanoparticles into the nanofiber core. Several composite ECNs have been reported, and among them, ZnO-SnO 2 , In 2 O 3 -WO 3 , Fe 2 O 3 -SnO 2 , SnO 2 -TiO 2 , and NiO-SnO 2 are remarkable examples. − Hybrid ECNs can be prepared following two main strategies: (i) by incorporating the desirable material during the electrospinning process or (ii) by post-electrospinning functionalization of the crystalline ECNs . The postprocessing method is a powerful alternative to incorporate materials that are not resistant to high temperature and thus not viable for the heat treatment step.…”

Section: Overview On the Synthesis Of Ecnsmentioning

confidence: 99%

Electrospun Ceramic Nanofibers and Hybrid-Nanofiber Composites for Gas Sensing

Mercante

André

Mattoso

et al. 2019

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Over the past few years, there has been a huge demand for developing sensors capable of monitoring and quantifying volatiles related to food quality analysis, medical diagnosis, and environmental monitoring. Sensors designed for such applications are required to present simultaneously high selectivity, low power consumption, fast response/recovery rate, low humidity dependence, and a low detection limit, which pose great challenges to be overcome in the development of suitable transducer nanomaterials for gas sensing. The nanostructure dimensionality certainly plays a key role for efficient gas detection. Thanks to the advantages derived from the nanoscaled size and the large surface-to-volume ratio, electrospun ceramic nanofibers (ECNs) have demonstrated great potential for the design of gas-sensing devices during the most recent years. Recently, studies have shown that the sensitivity, selectivity, and other important sensing parameters of ceramic nanofibers can be improved by designing heterojunctions at the nanoscale. As a consequence, outstanding composite and hybrid materials with unprecedented features have been recently reported for the detection of hazardous gases. In view of the importance and the potential impact of these results, here we review the latest findings and progress reported in the literature on the factors that influence the gas-sensing characteristics, as well as their application as gas sensors for monitoring various volatiles. This review will help researchers and engineers to understand the recent evolution and the challenges related to electrospun ceramic-based gas sensors and also further stimulate interest in the development of new gas-sensing devices.

show abstract