Enhanced acetone gas sensing properties by aurelia-like SnO₂micro-nanostructures

Abstract

In this work, well-defined three-dimensional aurelia-like SnO 2 micro-nanostructures have been successfully obtained through a simple and facile one-step low-temperature hydrothermal strategy in the presence of CTAB (cetyltrimethylammonium bromide) and PVP (polyvinylpyrrolidone), and developed for acetone gas detection. Such a unique structure and morphology of the as-obtained product is used to comprehensively characterize via techniques of XRD, SEM, TEM and HRTEM. The results reveal that 10 the aurelia-like SnO 2 micro-nanostructures are composed of two parts by the crown and tentacles. The crown and tentacles are assembled from a chassis of mass stunted, disorderly, cumulate nanosheets and a large number of curvy, uneven nanobelts, respectively. The special aurelia-like structure of the SnO 2 micro-nanostructures endow nanostructures-based sensors with enhanced acetone gas sensing performances in terms of a fast response time(2 s)/recovery time(23 s), high sensitivity, good repeatability 15 and well sensing selectivity at lower working temperature. The possible formation growth mechanism of the aurelia-like micro-nanostructures and a morphology-dependent sensing mechanism are proposed.

Tin dioxide nanomaterial-based photocatalysts for nitrogen oxide oxidation: a review

“…SnO 2 has a crystal structure similar to that of rutile TiO 2 ööö[ 41 – 42 ]. The unit cell parameters of rutile SnO 2 are a = b = 0.47374 nm and c = 0.31864 nm [ 43 ]. In one unit cell of rutile SnO 2 , a Sn 4+ ion is bonded to six oxygen ions, and every oxygen atom is coordinated by three Sn 4+ ions, forming a (6, 3) coordination structure [ 44 ].…”

Acetone Sensing Properties and Mechanism of SnO2 Thick-Films

“…Acetone can be used as a breath marker for the diagnosis of diabetes because the concentration of acetone in healthy individuals’ breath varies from 0.3 to 0.9 ppm and in the exhaled air of diabetic patients exceeds 1.8 ppm [ 18 ]. A chemiresistive type sensor using SnO 2 is considered as an exhalation gas sensor because of its excellent reactivity with volatile organic compounds (VOCs), easy fabrication processes, and the possibility of miniaturization of portable integration [ 3 , 4 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. For example, L. Cheng et al [ 3 ] have developed Y-doped SnO 2 hollow nanofibers for the detection of acetone.…”

Impact of reduced graphene oxide on the ethanol sensing performance of hollow SnO2 nanoparticles under humid atmosphere

“…For these purposes, gas sensors based on metal oxide semiconductors (MOS) are widely used because of their sensibility, low cost, and possibility of scaled-up production [3,4]. Among the MOS, SnO 2 , an n-type semiconductor, is one of the most studied material for VOCs monitoring with a great sensitivity toward several gases, including acetone [5,6], formaldehyde [7,8], toluene [9], ethanol [10,11], methanol [12], and so on.…”