A novel ethanol gas sensor based on TiO2/Ag0.35V2O5 branched nanoheterostructures

Abstract

Much greater surface-to-volume ratio of hierarchical nanostructures renders them attract considerable interest as prototypical gas sensors. In this work, a novel resistive gas sensor based on TiO2/Ag0.35V2O5 branched nanoheterostructures is fabricated by a facile one-step synthetic process and the ethanol sensing performance of this device is characterized systematically, which shows faster response/recovery behavior, better selectivity, and higher sensitivity of about 9 times as compared to the pure TiO2 nanofibers. The enhanced sensitivity of the TiO2/Ag0.35V2O5 branched nanoheterostructures should be attributed to the extraordinary branched hierarchical structures and TiO2/Ag0.35V2O5 heterojunctions, which can eventually result in an obvious change of resistance upon ethanol exposure. This study not only indicates the gas sensing mechanism for performance enhancement of branched nanoheterostructures, but also proposes a rational approach to design nanostructure based chemical sensors with desirable performance.

A Z‐Scheme Strategy that Utilizes ZnIn2S4 and Hierarchical VS2 Microflowers with Improved Charge‐Carrier Dynamics for Superior Photoelectrochemical Water Oxidation

“…Owing to a strong affinity of vanadium for oxygen, it underwent fast oxidation in air, as confirmed by the observance of other V 2p peaks at 517.54 (2p 3/2 ) and 524.84 eV (2p 1/2 ), which were assigned to V 5+ (V 2 O 5 ) . Similarly, the V 2p signals for ZnIn 2 S 4 –VS 2 showed two peaks at 516.57 and 523.66 eV, which were associated with V 4+ 2p 3/2 and V 4+ 2p 1/2 , whilst the two weaker peaks at 518.06 and 525.14 eV were attributed to V 5+ 2p 3/2 and V 5+ 2p 1/2 , respectively . As shown in Figure A–C, respectively, the Zn 2p, In 3d, and S 2p binding energies for ZnIn 2 S 4 –VS 2 were all slightly shifted to lower energy compared to those for bare ZnIn 2 S 4 .…”

One-step Synthesis of Ordered Pd@TiO2 Nanofibers Array Film as Outstanding NH3 Gas Sensor at Room Temperature

“…The most obvious factor is the chemical composition. Among the variety of appropriate materials, TiO 2 , as an important non-toxic semiconductor, shows wide potential applications in the sensing field owing to their advantages of earth abundance, chemical and thermal stability 1–5 . Thus, TiO 2 -based gas sensors have also been explored quite extensively.…”

Controlled Carbon Doping in Anatase TiO2 (101) Facets: Superior Trace‐Level Ethanol Gas Sensor Performance and Adsorption Kinetics

“…[7][8][9][10][11][12][13][14][15][16] Metal oxide semiconductors (MOS) are predominantly used in solid-state gas sensors which have been widely commercialized owing to its low cost, high sensitivity, fast response/ recovery, and simple electronic interfacing. [7][8][9][10][11][12][13][14][15][16] Metal oxide semiconductors (MOS) are predominantly used in solid-state gas sensors which have been widely commercialized owing to its low cost, high sensitivity, fast response/ recovery, and simple electronic interfacing.…”