Zeolitic Imidazolate Frameworks (ZIF-8)-Induced Porous α-Fe2O3/SnO2/ZnO Heterostructures as Remarkable Gas-Sensing Materials for Acetone Detection

2021 ◽  
Author(s):  
Qian Ma ◽  
Jia Guo ◽  
Ying Chen ◽  
Hui Li
Keyword(s):  
Gas Sensing ◽  
Zeolitic Imidazolate Frameworks ◽  
Acetone Detection

A facile method for preparation of porous nitrogen-doped Ti Ti3C2Tx MXene for highly responsive acetone detection at high temperature

2021 ◽  
pp. 2151043
Author(s):  
Zijing Wang ◽  
Fen Wang ◽  
Angga Hermawan ◽  
Jianfeng Zhu ◽  
Shu Yin
Keyword(s):  
Gas Sensor ◽  
Recovery Time ◽  
Gas Sensing ◽  
Three Dimensional ◽  
Gas Sensitivity ◽  
Nitrogen Doped ◽  
Dimensional Network ◽  
Potential Applications ◽  
Response And Recovery ◽  
Acetone Detection

Porous nitrogen-doped Ti3C2T[Formula: see text] MXene (N-TCT) with a three-dimensional network structure is synthesized via a simple sacrifice template method and then utilized as an acetone gas sensor. By introducing nitrogen atoms as heteroatoms into Ti3C2T[Formula: see text] nanosheets, some defects generate around the doped nitrogen atoms, which can greatly improve the surface hydrophilicity and adsorption capacity of Ti3C2T[Formula: see text] Mxene nanosheets. It resulted in the enhanced gas sensitivity, achieving a response value of about 36 ([Formula: see text]/[Formula: see text] × 100%) and excellent recovery time (9s) at 150[Formula: see text]C. Compared with the pure Ti3C2T[Formula: see text]-based gas sensor (381/92s), the response and recovery time are both obviously improved, and the response value increased by 3.5 times. The gas-sensing mechanism of the porous N-TCT is also discussed in detail. Based on the excellent gas sensitivity of porous N-TCT for highly responsive acetone detection at high temperatures, the strategy of nitrogen-doped two-dimensional nanomaterials can be extended to other nanomaterials to realize their potential applications.

Optimization and gas sensing properties of Au nanoparticle modified α-Fe2O3 nanodisk structures for highly sensitive acetone detection

2020 ◽  
Vol 44 (37) ◽  
pp. 16174-16184
Author(s):  
Haoyue Yang ◽  
Rui Zhou ◽  
Yongjiao Sun ◽  
Pengwei Li ◽  
Wendong Zhang ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Hydrothermal Method ◽  
Gas Sensing ◽  
Au Nanoparticle ◽  
Facile Hydrothermal Method ◽  
Sensing Properties ◽  
Highly Sensitive ◽  
Gas Sensing Properties ◽  
Acetone Detection

Au nanoparticle (Au NP) modified α-Fe2O3 nanodisk structures are obtained using a facile hydrothermal method and annealing based surface treatment.

Improved gas sensing properties of silver-functionalized ZnSnO3 hollow nanocubes

2018 ◽  
Vol 5 (9) ◽  
pp. 2123-2131 ◽  
Author(s):  
YanYang Yin ◽  
Feng Li ◽  
Nan Zhang ◽  
Shengping Ruan ◽  
Haifeng Zhang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Fast Response ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Response And Recovery ◽  
Porous Silver ◽  
Acetone Detection

Porous silver-functionalized ZnSnO3 hollow nanocubes as a gas sensor with an ultra-fast response and recovery speed for acetone detection.

scholarly journals Construction of 1D/2D α-Fe2O3/SnO2 Hybrid Nanoarrays for Sub-ppm Acetone Detection

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Huimin Gong ◽  
Changhui Zhao ◽  
Gaoqiang Niu ◽  
Wei Zhang ◽  
Fei Wang
Keyword(s):  
Gas Sensing ◽  
Operating Temperature ◽  
One Dimensional ◽  
Nanosheet Arrays ◽  
Breath Acetone ◽  
On Chip ◽  
Acetone Detection ◽  
Ppm Level

Exhaled acetone is one of the representative biomarkers for the noninvasive diagnosis of type-1 diabetes. In this work, we have applied a facile two-step chemical bath deposition method for acetone sensors based on α-Fe2O3/SnO2 hybrid nanoarrays (HNAs), where one-dimensional (1D) FeOOH nanorods are in situ grown on the prefabricated 2D SnO2 nanosheets for on-chip construction of 1D/2D HNAs. After annealing in air, ultrafine α-Fe2O3 nanorods are homogenously distributed on the surface of SnO2 nanosheet arrays (NSAs). Gas sensing results show that the α-Fe2O3/SnO2 HNAs exhibit a greatly enhanced response to acetone (3.25 at 0.4 ppm) at a sub-ppm level compared with those based on pure SnO2 NSAs (1.16 at 0.4 ppm) and pure α-Fe2O3 nanorods (1.03 at 0.4 ppm), at an operating temperature of 340°C. The enhanced acetone sensing performance may be attributed to the formation of α-Fe2O3–SnO2 n-n heterostructure with 1D/2D hybrid architectures. Moreover, the α-Fe2O3/SnO2 HNAs also possess good reproducibility and selectivity toward acetone vapor, suggesting its potential application in breath acetone analysis.

scholarly journals Cr-Doped Urchin-Like WO3 Hollow Spheres: The Cooperative Modulation of Crystal Growth and Energy-Band Structure for High-Sensitive Acetone Detection

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3473 ◽  
Author(s):  
Qiongling Ding ◽  
Yanrong Wang ◽  
Pengqian Guo ◽  
Jianjun Li ◽  
Chen Chen ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Photoelectron Spectroscopy ◽  
Gas Sensing ◽  
Metastable Phase ◽  
Hollow Spheres ◽  
Diabetic Patients ◽  
Exhaled Breath ◽  
Breath Acetone ◽  
Acetone Detection ◽  
Cr Doping

Acetone is a biomarker in the exhaled breath of diabetic patients; sensitive and selective detection of acetone in human exhaled breath plays an important role in noninvasive diagnosis. Tungsten oxide (especially for γ-WO3) is a promising material for the detection of breath acetone. It is generally believed that the stable metastable phase of WO3 (ε-WO3) is the main reason for the improved response to acetone detection. In this work, pure and Cr-doped urchin-like WO3 hollow spheres were synthesized by a facile hydrothermal approach. Analyses of the resulting materials via X-ray photoelectron spectroscopy (XPS) and Raman confirmed that they are mainly composed by γ-WO3. The gas sensing performances of pure and Cr-doped WO3 to acetone were systematically tested. Results show that the sensor based on pure WO3 annealed at 450 °C has a high response of 20.32 toward 100 ppm acetone at a working temperature of 250 °C. After doped with Cr, the response was increased 3.5 times higher than the pure WO3 sensor. The pure and Cr-doped WO3 sensors both exhibit a tiny response to other gases, low detection limits (ppb-level) and an excellent repeatability. The improvement of gas sensing properties could be attributed to an optimized morphology of Cr-doped WO3 by regulating the crystal growth and reducing the assembled nanowires’ diameter. The increasing number of oxygen vacancy and the introduction of impurity energy level with trap effect after Cr doping would lead to the wider depletion layer as well as a better gas sensing performance. This work will contribute to the development of new WO3 acetone sensors with a novel morphology and will explain the increased response after Cr doping from a new perspective.

A Novel Ceramic Sensing Material for Acetone Detection from Asphalt

2021 ◽  
Vol 16 (2) ◽  
pp. 312-317
Author(s):  
Peng Duan ◽  
Chunli Zhang ◽  
Wusi Chen ◽  
Yan Fu
Keyword(s):  
Electron Microscope ◽  
Gas Sensing ◽  
Molybdenum Trioxide ◽  
Optimum Operating ◽  
Acetone Vapor ◽  
X Ray Diffraction ◽  
Optimum Operating Temperature ◽  
Sensing Material ◽  
Transmission Electron ◽  
Acetone Detection

A novel ceramic sensing material, orthorhombic molybdenum trioxide (a-MoO3) nanobelts, was successfully prepared through a simple hydrothermal strategy. And its crystalline phase and microstructures were characterized via X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The results indicate that the size of the a-MoO3 nanobeltsis 180-250 nm in width and several microns in length. Gas sensing performances of the as-synthesized a-MoO3 nanobelts towards acetone vapor which was a representative VOCs in asphalt were investigated. The a-MoO3 nanobelts based gas sensor exhibits superior response at the optimum operating temperature of 300 °C for 200 ppm acetone vapor and excellent stability. The gas sensing mechanism for the a-MoO3 nanobelts to acetone vapor was also discussed.

scholarly journals CuO-Ga2O3 Thin Films as a Gas-Sensitive Material for Acetone Detection

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3142 ◽  
Author(s):  
Katarzyna Dyndal ◽  
Arkadiusz Zarzycki ◽  
Wojciech Andrysiewicz ◽  
Dominik Grochala ◽  
Konstanty Marszalek ◽  
...  
Keyword(s):  
Thin Films ◽  
Relative Humidity ◽  
Magnetron Sputtering ◽  
Gas Sensing ◽  
Pure Oxygen ◽  
X Ray Diffraction ◽  
Sensitive Material ◽  
X Ray ◽  
Acetone Detection ◽  
Reactive Mode

The p-n heterostructures of CuO-Ga2O3 obtained by magnetron sputtering technology in a fully reactive mode (deposition in pure oxygen) were tested under exposure to low acetone concentrations. After deposition, the films were annealed at previously confirmed conditions (400 °C/4 h/synthetic air) and further investigated by utilization of X-ray diffraction (XRD), X-ray reflectivity (XRR), energy-dispersive X-ray spectroscopy (EDS). The gas-sensing behavior was tested in the air/acetone atmosphere in the range of 0.1–1.25 ppm, as well as at various relative humidity (RH) levels (10–85%). The highest responses were obtained for samples based on the CuO-Ga2O3 (4% at. Ga).

Nanosheet-assembled, hollowed-out hierarchical γ-Fe2O3 microrods for high-performance gas sensing

2020 ◽  
Vol 8 (7) ◽  
pp. 3754-3762 ◽  
Author(s):  
Zhijia Song ◽  
Hanming Chen ◽  
Susu Bao ◽  
Zhaoxiong Xie ◽  
Qin Kuang ◽  
...  
Keyword(s):  
High Performance ◽  
Gas Sensing ◽  
Fast Response ◽  
Acetone Detection

Nanosheet-assembled, hollowed-out hierarchical γ-Fe2O3 microrods for ultrahigh-sensitive and fast response acetone detection were constructed through a MgO-mediated template conversion strategy.

scholarly journals Tin Dioxide Thin Film with UV-enhanced Acetone Detection in Microwave Frequency Range

Micromachines ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 574 ◽  
Author(s):  
Artur Rydosz ◽  
Kamil Staszek ◽  
Andrzej Brudnik ◽  
Slawomir Gruszczynski
Keyword(s):  
Gas Sensors ◽  
Tin Dioxide ◽  
Gas Sensing ◽  
Microwave Frequency ◽  
Uncertainty Distribution ◽  
Complex Reflection Coefficient ◽  
Gas Concentration ◽  
Uv Illumination ◽  
Illumination Effect ◽  
Acetone Detection

In this paper, the UV illumination effect for microwave gas sensors based on the tin dioxide was verified. A UV LED with emission wavelength close to the absorption edge of the SnO2 gas-sensing layer was selected as the UV source. The developed gas sensors were tested under exposure to acetone in the 0–200 ppm range at room temperature. The sensor’s complex reflection coefficient corresponding to target gas concentration was measured with the use of a five-port reflectometer system exhibiting enhanced uncertainty distribution, which allows for the detection of low gas concentration. The UV illumination significantly emphasizes the sensors’ response in terms of both magnitude and phase for low gas concentrations, in contrast to previously reported results, in which only the reflection coefficient’s phase was affected. The highest responses were obtained for modulated UV illumination.

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