The role of surface stoichiometry in NO2 gas sensing using single and multiple nanobelts of tin oxide

2021 ◽  
Vol 23 (16) ◽  
pp. 9733-9742
Author(s):  
Mateus G. Masteghin ◽  
Ranilson A. Silva ◽  
David C. Cox ◽  
Denis R. M. Godoi ◽  
S. Ravi P. Silva ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Tin Oxide ◽  
Gas Sensing ◽  
Debye Length ◽  
Sensor Devices ◽  
Sensor Signals

Single-nanobelt gas sensor devices were nanofabricated to estimate Sn3O4 and SnO2 Debye length (LD) in presence of NO2, and gas–solid interactions between O species/NO2 and Sn2+/Sn4+ surfaces were proposed based on tin oxide sensor signals.

scholarly journals A new approach to gas sensing with nanotechnology

2012 ◽  
Vol 370 (1967) ◽  
pp. 2448-2473 ◽  
Author(s):  
Swati Sharma ◽  
Marc Madou
Keyword(s):  
Low Power ◽  
Gas Sensor ◽  
Lower Cost ◽  
Gas Sensing ◽  
Limit Of Detection ◽  
Oxide Semiconductors ◽  
New Approach ◽  
Sensor Devices ◽  
Carbon Nanowire ◽  
Nanostructured Metal

Nanosized gas sensor elements are potentially faster, require lower power, come with a lower limit of detection, operate at lower temperatures, obviate the need for expensive catalysts, are more heat shock resistant and might even come at a lower cost than their macro-counterparts. In the last two decades, there have been important developments in two key areas that might make this promise a reality. First is the development of a variety of very good performing nanostructured metal oxide semiconductors (MOSs), the most commonly used materials for gas sensing; and second are advances in very low power loss miniaturized heater elements. Advanced nano- or micro–nanogas sensors have attracted much attention owing to a variety of possible applications. In this article, we first discuss the mechanism underlying MOS-based gas sensor devices, then we describe the advances that have been made towards MOS nanostructured materials and the progress towards low-power nano- and microheaters. Finally, we attempt to design an ideal nanogas sensor by combining the best nanomaterial strategy with the best heater implementation. In this regard, we end with a discussion of a suspended carbon nanowire-based gas sensor design and the advantages it might offer compared with other more conventional gas sensor devices.

scholarly journals Transfer Printing Technology as a Straightforward Method to Fabricate Chemical Sensors Based on Tin Dioxide Nanowires

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3049
Author(s):  
Florentyna Sosada-Ludwikowska ◽  
Robert Wimmer-Teubenbacher ◽  
Martin Sagmeister ◽  
Anton Köck
Keyword(s):  
Gas Sensor ◽  
Tin Dioxide ◽  
Gas Sensing ◽  
Transfer Printing ◽  
Electrode Structure ◽  
Step Method ◽  
Printing Technology ◽  
Straightforward Method ◽  
Spray Pyrolysis Deposition ◽  
Sensor Devices

Metal oxide multi-nanowire-based chemical gas sensors were manufactured by a fast and simple transfer printing technology. A two-step method employing spray pyrolysis deposition and a thermal annealing process was used for SnO 2 nanowires fabrication. A polydimethylsiloxane stamp was used to transfer the SnO 2 nanowires on two different gas sensing devices—Si-based substrates and microhotplate-based platform chips. Both contained a metallic inter-digital electrode structure (IDES), on which the SnO 2 nanowires were transferred for realization of multi-NW gas sensor devices. The gas sensor devices show a very high response towards H 2 S down to the 10 ppb range. Furthermore, a good response towards CO has been achieved, where in particular the microhotplate-based devices exhibit almost no cross sensitivity to humidity.

scholarly journals A Micromachined Metal Oxide Composite Dual Gas Sensor System for Principal Component Analysis-Based Multi-Monitoring of Noxious Gas Mixtures

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 24
Author(s):  
In-Hwan Yang ◽  
Joon-Hyung Jin ◽  
Nam Ki Min
Keyword(s):  
Principal Component Analysis ◽  
Metal Oxide ◽  
Gas Sensor ◽  
Microelectromechanical Systems ◽  
Gas Sensing ◽  
Principal Component ◽  
Component Analysis ◽  
Oxide Semiconductor ◽  
Mixed Gas ◽  
Sensor Devices

Microelectronic gas-sensor devices were developed for the detection of carbon monoxide (CO), nitrogen dioxides (NO2), ammonia (NH3) and formaldehyde (HCHO), and their gas-sensing characteristics in six different binary gas systems were examined using pattern-recognition methods. Four nanosized gas-sensing materials for these target gases, i.e., Pd-SnO2 for CO, In2O3 for NOX, Ru-WO3 for NH3, and SnO2-ZnO for HCHO, were synthesized using a sol-gel method, and sensor devices were fabricated using a microsensor platform. Principal component analysis of the experimental data from the microelectromechanical systems gas-sensor arrays under exposure to single gases and their mixtures indicated that identification of each individual gas in the mixture was successful. Additionally, the gas-sensing behavior toward the mixed gas indicated that the traditional adsorption and desorption mechanism of the n-type metal oxide semiconductor (MOS) governs the sensing mechanism of the mixed gas systems.

THERMAL DIFFUSIVITY STUDIES OF ZnO-CuO AT HIGH TEMPERATURES

2015 ◽  
Vol 76 (3) ◽  
Author(s):  
Rabiatuladawiyah Md Akhir ◽  
Zaidan Abd Wahab
Keyword(s):  
Zinc Oxide ◽  
Thermal Diffusivity ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Laser Flash ◽  
Ceramic Composites ◽  
Solid State Method ◽  
Laser Flash Technique ◽  
Composite Samples

An n-type semiconducting oxide such as Zinc Oxide (ZnO) has been exploited for their well-known gas sensing properties. Previous studies on these applications have mainly focused on electrical properties. Only limited reports were available on thermophysical properties of ZnO-based ceramics gas sensor. Therefore in this work, we report on the thermal diffusivity of Zinc Oxide-Copper Oxide (ZnO-CuO) ceramic composites by solid-state method using a laser flash technique. Thermal diffusivity of samples was measured at temperatures between 27 °C to 400 °C. The role of CuO was observed to enhance the thermal diffusivity of ZnO system with respect to the temperatures. ZnO-CuO samples played a significant role in improvement of thermal diffusivity value at temperature of 200 °C and above. Subsequently, sample of higher thermal diffusivity will exhibit lower initialization time for gas sensor to activate. Hence, the enhanced thermal diffusivity suggested that ZnO-CuO composite samples hold a promising possibility in gas sensor application. 

The role of oxygen adsorption and gas sensing mechanism for cerium vanadate (CeVO4) nanorods

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 14552-14558 ◽  
Author(s):  
Jimin Hou ◽  
Huihan Huang ◽  
Zhizhong Han ◽  
Haibo Pan
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Oxygen Adsorption ◽  
Sensing Mechanism ◽  
Highly Active ◽  
Cerium Vanadate

Square-section CeVO4 nanorods with highly active and exposed (010) facets have been shown to be highly promising as an acetone gas sensor.

GAS MIXTURE QUANTIFICATION BASED ON HILBERT–HUANG TRANSFORM AND NEURAL NETWORK BY A SINGLE SENSOR

2011 ◽  
Vol 25 (06) ◽  
pp. 927-942 ◽  
Author(s):  
GUANGFEN WEI ◽  
WEN AN ◽  
ZHILIN ZHU
Keyword(s):  
Neural Network ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Temperature Modulation ◽  
Feature Extraction Method ◽  
Hilbert Huang Transform ◽  
Response Information ◽  
Mode Decomposition ◽  
Empirical Mode Decomposition Method ◽  
Sensor Signals

Temperature modulation has been proved to be an efficient technique for improving the selectivity and stability of gas sensors. In this paper, a new signal processing approach is proposed for metal oxide gas sensor signals under the modulation of its operating temperature, which combined a novel global feature extraction method based on the Hilbert–Huang Transform with a pattern recognition method based on neural network. By using the empirical mode decomposition method, the dynamic signals are decomposed into the intrinsic modes that coexist in the sensor system, and a better understanding of the nature of the gas sensing response information contained in the sensor response signals is approached. The method is demonstrated by an application in the identification and quantification of gas mixtures containing three flammable species using a micro gas sensor. The three gas analytes are methane ( CH4), ethanol ( C2H6O ) and carbon monoxide (CO). And the relative average quantification errors for the three gases are about 7%, 8% and 12%, respectively.

Fabrication of Tin Oxide Based Gas Sensor in Ethanol Gas Sensing

2020 ◽  
Author(s):  
Chien-Fang Ding ◽  
Yi-Cheng Lin ◽  
Ching-Ching Yang ◽  
Kuo-Cheng Huang ◽  
Yu-Jen Hsiao ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Tin Oxide ◽  
Gas Sensing

Investigation of stability and reliability of tin oxide thin-film for integrated micro-machined gas sensor devices

2001 ◽  
Vol 81 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Rajnish K. Sharma ◽  
Philip C.H. Chan ◽  
Zhenan Tang ◽  
Guizhen Yan ◽  
I-Ming Hsing ◽  
...  
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Tin Oxide ◽  
Oxide Thin Film ◽  
Sensor Devices
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