Construction of Hierarchical α‐Fe₂O₃/SnO₂ Nanoball Arrays with Superior Acetone Sensing Performance

Abstract

commercial applications both in military and civilian fields. [2-5] From the aspect of safety and environmental quality, gas sensors are becoming more and more important in our daily life, because they can instantly monitor the potential risk of explosive/toxic gas emission or leakage. [6] Acetone, for example, a kind of volatile organic compound (VOCs) with special aroma and colorless transparent nature, which is extensively utilized in micro/ nanoelectronics field, lithography, coatings, leather, pesticides, explosive plastic, rubber, paint, etc. [7-10] Specifically, acetone is also a flammable, explosive, and toxic organic liquid with an ignition point of 465 °C, and the most easily ignitable concentration is 4.5%. [11] Moreover, acetone vapor and air can easily form one explosive mixture with the explosive limit of ≈2.6-12.8%, and the concentration of the maximum explosive pressure is 6.3%. Therefore, once the acetone leakage occurs, it is easy to trigger public safety accident. [12,13] In recent years, MOSs such as SnO 2 , Fe 2 O 3 , ZnO, WO 3 , In 2 O 3 and their hybrids/composites based electronics such as sensors and detectors have allured intensive desire due to the wide application on detecting irritative, malodorous, explosive, and toxic VOC gases. [4,14-19] Unfortunately, gas sensors based on MOSs are still bearing some urgent problems to overcome such as slow response, a narrow detection limit, inferior selectivity, and short-term cycling stability, especially in high humidity conditions. [20,21] Very recently, many strategies have been proposed to relieve the above shortcomings via various intrigues such as rare metal decoration, doping modification technology, heterojunction, microwave-assist, etc. [22-27] Accordingly, some convincible progress and results have been achieved or are pushing forward. In 2019, Lu's group reported that the Au-doped and Au-loaded mesoporous In 2 O 3 exhibited superior acetone sensing performance. It was demonstrated that the sensing performance can be manipulated by different doping or loading methods of Au; Thereafter, the SnO 2 ultrathin films functionalized by single atom Pt could greatly enhance the trietylamine gas sensing performance; [25,28] Then, Chen and his co-workers reported that the p(NiO)/n(ZnO) heterojunction networks could increase the gas sensor response by more than four times, meanwhile, the lower detection limit was achieved. On the other hand, the p-n nanoheterojunction networks displayed a strong and selective response toward acetone and ethanol under Gas sensors based on SnO 2 , Fe 2 O 3 , and their nanocomposites are promising candidates for sensing of acetone, ethanol, hydrogen, NO 2 , ozone, and formaldehyde. In this work, a rational hydrothermal route is designed to prepare α-Fe 2 O 3 /SnO 2 porous sphere arrays assembled with hierarchical nanostructure (denoted as α-Fe 2 O 3 (x%)/SnO 2). The results demonstrate that the α-Fe 2 O 3 (4%)/SnO 2 based sensor exhibits excellent sensing performance, the short response/recovery time of 3 and 4 s, re...

Metal–organic framework-derived trimetallic oxides with dual sensing functions for ethanol

“…The phase of α-Fe 2 O 3 can boost the redox process, whereas Fe 7 Co 1.5 Ni 1.5 can be applied as a catalyst according to previous reports. 24,33,34 Furthermore, the ethanol sensing properties of the sensor based on pristine α-Fe 2 O 3 are shown in Fig. S10.…”

Ceria Quantum Dot-Decorated Carbon Nanotubes as a Room-Temperature Acetone Sensor

“…Generally, semiconducting metal oxides (SMOs) are favored for the gas sensing application because of their superior electrical properties with high selectivity, easy and low cost production, and high thermal stability. , A variety of SMOs have been reported for the detection of acetone such as SnO 2 , ZnO, NiO, TiO 2 , WO 3 , Fe 2 O 3 , and In 2 O 3 . For instance, Wang et al reported α-Fe 2 O 3 /SnO 2 nanoball-based acetone sensor which shows a response of 42.6 with a response/recovery time of 3 s/4 s toward 100 ppm acetone at 200 °C temperature. Another acetone sensor based on Pd@WO 3 /SnO 2 was studied by Zhang et al and the sensor exhibits a response of 63.8 toward 50 ppm acetone at 275 °C.…”

The co-enhanced effect of Zn-doping and Ag-loading on the selectivity of a p-type Fe2O3 toward acetone

“…12 According to previous reports, a variety of α-Fe 2 O 3 sensing materials with different morphologies have been synthesized for the detection of VOCs due to their low pollution, low cost, and stable chemical characteristics. 13–16 For example, porous nanowire-like α-Fe 2 O 3 prepared by thermal decomposition exhibited a fast response/recovery time of 15/13 s in 100 ppm ethanol. 17 α-Fe 2 O 3 nanosheets with specified exposed facets obtained by using a calcination method could detect ethanol and triethylamine vapors.…”