scholarly journals Selective gas detection using Mn3O4/WO3 composites as a sensing layer

2019 ◽  
Vol 10 ◽  
pp. 1423-1433 ◽  
Author(s):  
Yongjiao Sun ◽  
Zhichao Yu ◽  
Wenda Wang ◽  
Pengwei Li ◽  
Gang Li ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Hydrogen Sulfide ◽  
Gas Sensing ◽  
Gas Detection ◽  
Facile Hydrothermal Method ◽  
Potential Applications ◽  
Different Temperatures ◽  
Different Gases ◽  
Sensing Performance ◽  
Mn Concentrations

Pure WO3 sensors and Mn3O4/WO3 composite sensors with different Mn concentrations (1 atom %, 3 atom % and 5 atom %) were successfully prepared through a facile hydrothermal method. As gas sensing materials, their sensing performance at different temperatures was systematically investigated for gas detection. The devices displayed different sensing responses toward different gases at specific temperatures. The gas sensing performance of Mn3O4/WO3 composites (especially at 3 atom % Mn) were far improved compared to sensors based on pure WO3, where the improvement is related to the heterojunction formed between the two metal oxides. The sensor based on the Mn3O4/WO3 composite with 3 atom % Mn showed a high selective response to hydrogen sulfide (H2S), ammonia (NH3) and carbon monoxide (CO) at working temperatures of 90 °C, 150 °C and 210 °C, respectively. The demonstrated superior selectivity opens the door for potential applications in gas recognition and detection.

scholarly journals Multicomponent Metal Oxide Nanostructures: Fabrication and Study of Core Issues to Improve Gas Sensing Performance

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 970
Author(s):  
Vardan Galstyan ◽  
Andrea Ponzoni ◽  
Iskandar Kholmanov ◽  
Marta M. Natile ◽  
Antonella Glisenti ◽  
...  
Keyword(s):  
Chemical Sensors ◽  
Gas Sensing ◽  
Cost Effective ◽  
Sensing Properties ◽  
Oxide Nanostructures ◽  
Porous Titania ◽  
Metal Oxide Nanostructures ◽  
Potential Applications ◽  
Core Issues ◽  
Sensing Performance

We have obtained and studied the sensing properties of porous titania-based nanostructures. The materials have been prepared using cost-effective techniques. The morphological and structural analyses of the prepared materials have been performed. The sensing properties of the samples have been studied towards carbon monoxide. The obtained results demonstrate that the prepared structures are promising for the potential applications in the area of chemical sensors for the environmental monitoring.

Gas sensing properties of Cu2O and its particle size and morphology-dependent gas-detection sensitivity

2014 ◽  
Vol 2 (33) ◽  
pp. 13641-13647 ◽  
Author(s):  
Xuejuan Wan ◽  
Jilei Wang ◽  
Lianfeng Zhu ◽  
Jiaoning Tang
Keyword(s):  
Particle Size ◽  
Gas Sensing ◽  
Detection Sensitivity ◽  
Gas Detection ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Key Factor ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Sensing Performance

Particle size and morphology-dependent gas-detection sensitivity were studied, and the results indicated that the particle stacking mode is a key factor influencing gas sensing performance.

scholarly journals Gas Sensing Studies of Tin Oxide Thin Films Annealed at Different Temperatures

2017 ◽  
Vol 9 (2) ◽  
pp. 10
Author(s):  
K. S. Thakare ◽  
S. J. Patil ◽  
R. R. Ahire
Keyword(s):  
Thin Films ◽  
Tin Oxide ◽  
Vapour Deposition ◽  
Gas Sensing ◽  
Physical Vapour Deposition ◽  
Working Temperature ◽  
Gas Sensing Properties ◽  
Different Temperatures ◽  
Gas Response ◽  
Different Gases

Thin films of Tin oxide (SnO<sub>2</sub>) were prepared by physical vapour deposition method. The as-prepared films were further annealed at 300°C, 400°C and 500°C to study the effect of annealing on the physical as well as gas sensing properties of the thin films. Gas sensing performance of annealed SnO<sub>2</sub> thin films was studied for different gases having different concentrations at working temperature of 250°C. Significantly, gas response changes for SnO<sub>2</sub> samples annealed at different temperatures, which is discussed herein.

Impedance Spectroscopic Inspection Toward Sensitivity Enhancement of Ag-Doped WO3 Nanofiber-Based Carbon Monoxide Gas Sensor

2016 ◽  
Vol 872 ◽  
pp. 230-234
Author(s):  
Pundaree Boonma ◽  
Papot Jaroenapibal ◽  
Mati Horprathum ◽  
Sathiraporn Pornnimitra ◽  
Boonying Charoen ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Gas Sensing ◽  
Impedance Analysis ◽  
Nyquist Plot ◽  
Gas Detection ◽  
Ag Nanoparticle ◽  
Electrical Parameters ◽  
Electrospinning Technique ◽  
Sensor Material ◽  
Impedance Modeling

This work reports the impedance analysis and carbon monoxide gas sensing response of tungsten oxide (WO3) nanofibers with silver (Ag) nanoparticle doping. The Ag-doped WO3 nanofibers were prepared by an electrospinning technique. The impedance spectroscopic measurements of undoped and Ag-doped WO3 nanofibers were performed to study the contribution of electrical parameters involved in the electron transport. The impedance modeling obtained from the fitted Nyquist plot shows that the RC components attributed to Ag-WO3 interface are introduced to the system upon Ag addition. Carbon monoxide (CO) gas detection was carried out by resistance measurement using a DC method. The sensitivity of Ag-doped WO3 nanofibers is found to be greater than that of the undoped sample. The improved sensitivity is derived from the high interface resistance between Ag and WO3 grains. The contribution of Ag dopants is conceived to induce electronic structure alteration of the sensor material.

scholarly journals Review of Incoherent Broadband Cavity-Enhanced Absorption Spectroscopy (IBBCEAS) for Gas Sensing

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3646 ◽  
Author(s):  
Kaiyuan Zheng ◽  
Chuantao Zheng ◽  
Yu Zhang ◽  
Yiding Wang ◽  
Frank Tittel
Keyword(s):  
Absorption Spectroscopy ◽  
Recent Progress ◽  
Gas Sensing ◽  
Field Measurements ◽  
System Structure ◽  
Gas Detection ◽  
Detection Scheme ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
Potential Applications

Incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) is of importance for gas detection in environmental monitoring. This review summarizes the unique properties, development and recent progress of the IBBCEAS technique. Principle of IBBCEAS for gas sensing is described, and the development of IBBCEAS from the perspective of system structure is elaborated, including light source, cavity and detection scheme. Performances of the reported IBBCEAS sensor system in laboratory and field measurements are reported. Potential applications of this technique are discussed.

scholarly journals Recent Advances in Spectroscopic Gas Sensing With Micro/Nano-Structured Optical Fibers

2021 ◽  
Vol 11 (2) ◽  
pp. 141-157
Author(s):  
Wei Jin ◽  
Haihong Bao ◽  
Pengcheng Zhao ◽  
Yan Zhao ◽  
Yun Qi ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Gas Sensing ◽  
Gas Detection ◽  
Direct Absorption ◽  
Detection Systems ◽  
Recent Advances ◽  
Stimulated Raman

AbstractWith micro- and nano-structured optical fibers, parts-per-million to parts-per-trillion level gas detection has been demonstrated for a range of gases such as methane, acetylene, ethane, carbon monoxide, hydrogen, and oxygen. We review the recent development in optical fiber gas cells and gas detection systems based on direct absorption, photothermal, photoacoustic, and stimulated Raman spectroscopies.

Fabrication and enhanced carbon monoxide gas sensing performance of p-CuO/n-TiO2 heterojunction device

2021 ◽  
Vol 612 ◽  
pp. 125962
Author(s):  
Umesh T. Nakate ◽  
Pramila Patil ◽  
Seok-In Na ◽  
Y.T. Yu ◽  
Eun-kyung Suh ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Gas Sensing ◽  
Heterojunction Device ◽  
Sensing Performance

scholarly journals AZO-Based ZnO Nanosheet MEMS Sensor with Different Al Concentrations for Enhanced H2S Gas Sensing

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3377
Author(s):  
Yempati Nagarjuna ◽  
Jun-Cong Lin ◽  
Sheng-Chang Wang ◽  
Wen-Tse Hsiao ◽  
Yu-Jen Hsiao
Keyword(s):  
Zinc Oxide ◽  
Gas Sensing ◽  
Growth Time ◽  
Optimal Conditions ◽  
Gas Concentration ◽  
Zno Nanostructure ◽  
Mems Sensor ◽  
Different Temperatures ◽  
Micro Electromechanical System ◽  
Different Gases

The properties of H2S gas sensing were investigated using a ZnO nanostructure prepared with AZO (zinc oxide with aluminium) and Al surfaces which were developed on a MEMS (Micro Electromechanical System) device. Hydrothermal synthesis was implemented for the deposition of the ZnO nanostructure. To find the optimal conditions for H2S gas sensing, different ZnO growth times and different temperatures were considered and tested, and the results were analysed. At 250 °C and 90 min growth time, a ZnO sensor prepared with AZO and 40 nm Al recorded an 8.5% H2S gas-sensing response at a 200 ppb gas concentration and a 14% sensing response at a gas concentration of 1000 ppb. The dominant sensing response provided the optimal conditions for the ZnO sensor, which were 250 °C temperature and 90 min growth time. Gas sensor selectivity was tested with five different gases (CO, SO2, NO2, NH3 and H2S) and the sensor showed great selectivity towards H2S gas.

scholarly journals Hydrothermal Synthesis of Pt-, Fe-, and Zn-dopedSnO2Nanospheres and Carbon Monoxide Sensing Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Weigen Chen ◽  
Qu Zhou ◽  
Shudi Peng
Keyword(s):  
Carbon Monoxide ◽  
Gas Sensing ◽  
First Principles Calculation ◽  
Diffraction Field ◽  
Facile Hydrothermal Method ◽  
X Ray ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Response And Recovery ◽  
Higher Sensitivity

Pure and M-doped (M = Pt, Fe, and Zn) SnO2nanospheres were successfully synthesized via a simple and facile hydrothermal method and characterized by X-ray powder diffraction, field-emission scanning electron microscopy, and energy dispersive spectroscopy. Chemical gas sensors were fabricated based on the as-synthesized nanostructures, and carbon monoxide sensing properties were systematically measured. Compared to pure, Fe-, and Zn-doped SnO2nanospheres, the Pt-doped SnO2nanospheres sensor exhibits higher sensitivity, lower operating temperature, more rapid response and recovery, better stability, and excellent selectivity. In addition, a theoretical study based on the first principles calculation was conducted. All results demonstrate the potential of Pt dopant for improving the gas sensing properties of SnO2-based sensors to carbon monoxide.

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