Improved Hydrogen Monitoring Properties Based on p-NiO/n-SnO₂ Heterojunction Composite Nanofibers

Abstract

Here we demonstrate the preparation and improved hydrogen monitoring properties based on p-NiO/n-SnO 2 heterojunction composite nanofibers via the electrospinning technique and calcination procedure. NiO/SnO 2 heterojuction composite nanofibers were spin-coated on the ceramic tube with a pair of Au electrodes for the detection of hydrogen. Extremely fast response-recovery behavior (∼3s) has been obtained at the operable temperature of 320 °C, based on our gas sensor, with the detection limit of approximate 5 ppm H 2 . The role of the addition of NiO into the SnO 2 nanofibers and the sensing mechanism has also been discussed in this work.

High triethylamine-sensing properties of NiO/SnO2 hollow sphere P–N heterojunction sensors

“…The generally accepted sensing mechanism for pure SnO 2 gas sensors has been well interpreted by the space-charge layer mode [4,[32][33][34]. The basic working principle of SnO 2 gas sensors depends on the variation of resistance, caused by the chemical adsorption and desorption of gas molecules.…”

Low‐Temperature Growth of SnO2 Nanorod Arrays and Tunable n–p–n Sensing Response of a ZnO/SnO2 Heterojunction for Exclusive Hydrogen Sensors

“…[ 19 ] Unfortunately, most of the latest work has been focused on their high surface area, and little effort has been made to improve the H 2 selectivity of the SnO 2 -based nano structures. [ 20 ] Surface modifi cations with catalytic metal nanoparticles, [ 21 ] the use of oxides, [ 22 ] and the molecular sieve effect [ 23 ] have been explored to increase the selectivity of SnO 2 sensors to H 2 over other reducing gases. However, the enhancement by surface modifi cation is still not satisfactory and cross-detection still occurs among some reducing gases.…”

Porous silicon filled with Pd/WO3–ZnO composite thin film for enhanced H2 gas-sensing performance

“…Therefore, remarkable efforts have been done to moderate the working temperature (#200 C) of gas sensors via formation of (n-n or n-p heterojunction at the interface) nanostructured composite material and enlightening the sensing properties by rising the adsorption and desorption rate of analyte gas molecules at the sensor surface. 19,20 This leads to fabrication of the new active sensing material in order to meet the remarkable high sensing performance criteria with fast response, low power consumption, high reproducibility and reliability. Based on these investigations, the Pd decorated WO 3 -ZnO composite thin lms may be fabricated as fast response gas sensors which can be recognized to detect low concentration (ppm) of hydrogen in storage and sensing device applications.…”