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 Transfer Printing Technology for Fabricating Chemical Sensors Based on Tin Dioxide Nanowires

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1076
Author(s):  
Florentyna Sosada-Ludwikowska ◽  
Robert Wimmer-Teubenbacher ◽  
Anton Köck
Keyword(s):  
Tin Dioxide ◽  
High Sensitivity ◽  
Transfer Printing ◽  
Printing Technology ◽  
Pdms Stamp ◽  
Si Substrates ◽  
Sno2 Nanowires ◽  
Spray Pyrolysis Deposition ◽  
Cu Catalyst ◽  
Performance Results

Multi-nanowire based chemical gas sensors were produced employing a fast and simple transfer printing technology. SnO2 nanowires (NWs) were grown by a specific two-step technology including spray pyrolysis deposition and a thermal annealing process in presence of a Cu-catalyst. Subsequently the SnO2 NWs were print transferred by a polydimethylsiloxane (PDMS) stamp on Si-substrates with gold inter-digital electrode structures (IDES) creating a multi-NW chemical sensing device. The print-transfer technology enables a fast, easy and cheap fabrication of NW-based sensor devices with a good reproducibility. High sensitivity to H2S has been achieved, the performance results are presented in this work.

scholarly journals Resistance-Capacitance Gas Sensor Based on Fractal Geometry

Chemosensors ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 31 ◽  
Author(s):  
Taicong Yang ◽  
Fengchun Tian ◽  
James A. Covington ◽  
Feng Xu ◽  
Yi Xu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Fractal Geometry ◽  
Geometrical Structure ◽  
Gas Sensing ◽  
Superior Performance ◽  
Electrode Structure ◽  
Geometrical Structures ◽  
Surface Areas ◽  
Sensor Resistance

An important component of any chemiresistive gas sensor is the way in which the resistance of the sensing film is interrogated. The geometrical structure of an electrode can enhance the performance of a gas-sensing device and in particular the performance of sensing films with large surface areas, such as carbon nanotubes. In this study, we investigated the influence of geometrical structure on the performance of gas sensors, combining the characteristics of carbon nanotubes with a novel gas sensor electrode structure based on fractal geometry. The fabricated sensors were tested with exposure to nitric oxide, measuring both the sensor resistance and capacitance (RC) of the sensor responses. Experimental results showed that the sensors with fractal electrode structures had a superior performance over sensors with traditional geometrical structures. Moreover, the RC characteristics of these fractal sensors could be further improved by using different test frequencies that could aid in the identification and quantification of a target gas.

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.

Modeling the Growth of Tin Dioxide Using Spray Pyrolysis Deposition for Gas Sensor Applications

2014 ◽  
Vol 27 (2) ◽  
pp. 269-277 ◽  
Author(s):  
Lado Filipovic ◽  
Siegfried Selberherr ◽  
Giorgio C. Mutinati ◽  
Elise Brunet ◽  
Stephan Steinhauer ◽  
...  
Keyword(s):  
Spray Pyrolysis ◽  
Gas Sensor ◽  
Tin Dioxide ◽  
Sensor Applications ◽  
Spray Pyrolysis Deposition

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.

scholarly journals Ethanol Sensors Based on Porous In2O3 Nanosheet-Assembled Micro-Flowers

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3353
Author(s):  
Wenbo Qin ◽  
Zhenyu Yuan ◽  
Hongliang Gao ◽  
Fanli Meng
Keyword(s):  
Electron Microscopy ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Hydrothermal Time ◽  
Hydrothermal Conditions ◽  
Step Method ◽  
Detection Range ◽  
Transmission Electron ◽  
Porous Nanosheets ◽  
One Step

By controlling the hydrothermal time, porous In2O3 nanosheet-assembled micro-flowers were successfully synthesized by a one-step method. The crystal structure, microstructure, and internal structure of the prepared samples were represented by an x-ray structure diffractometry, scanning electron microscopy, and transmission electron microscopy, respectively. The characterization results showed that when the hydrothermal time was 8 h, the In2O3 nano materials presented a flower-like structure assembled by In2O3 porous nanosheets. After successfully preparing the In2O3 gas sensor, the gas sensing was fully studied. The results show that the In2O3 gas sensor had an excellent gas sensing response to ethanol, and the material prepared under 8 h hydrothermal conditions had the best gas sensing property. At the optimum working temperature of 270 °C, the highest response value could reach 66, with a response time of 12.4 s and recovery time of 10.4 s, respectively. In addition, the prepared In2O3 gas sensor had a wide detection range for ethanol concentration, and still had obvious response for 500 ppb ethanol. Furthermore, the gas sensing mechanism of In2O3 micro-flowers was also studied in detail.

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 Optimizing electrode structure of carbon nanotube gas sensors for sensitivity improvement based on electric field enhancement effect of fractal geometry

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Taicong Yang
Keyword(s):  
Carbon Nanotubes ◽  
Electric Field ◽  
Gas Sensor ◽  
Fractal Geometry ◽  
Gas Sensing ◽  
Hot Spot ◽  
Rapid Development ◽  
Enhancement Effect ◽  
Electrode Structure ◽  
Geometrical Structures

AbstractWith the rapid development of carbon nanotubes gas sensor, the sensitivity of the sensing response is becoming more and more demanding. Different from the traditional studies on gas-sensitive materials, this paper combines the microscopic dimensional effects and physical properties of fractal geometry theory from the structure and morphology of sensor devices. The electrode structures of carbon nanotubes gas sensor is designed and optimized by Hilbert–Piano curve. Simulation experiments demonstrate that the electric field intensity and hot spot distribution of the fractal electrode are superior to those of the traditional interdigital electrode. Moreover, a novel chemiresistive gas sensor is fabricated combining the characteristics of carbon nanotubes and fractal geometry, and a test with exposure to nitric oxide showed that the sensors with fractal electrode structures improved the gas sensing sensitivity over sensors with traditional geometrical structures. It provides a new idea for the exploration of gas sensing technology.

Metal-oxide based ammonia gas sensors: A review

2020 ◽  
Vol 10 ◽  
Author(s):  
Priya Gupta ◽  
Savita Maurya ◽  
Narendra Kumar Pandey ◽  
Vernica Verma
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Review Paper ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Ammonia Gas Sensors

: This review paper encompasses a study of metal-oxide and their composite based gas sensors used for the detection of ammonia (NH3) gas. Metal-oxide has come into view as an encouraging choice in the gas sensor industry. This review paper focuses on the ammonia sensing principle of the metal oxides. It also includes various approaches adopted for increasing the gas sensitivity of metal-oxide sensors. Increasing the sensitivity of the ammonia gas sensor includes size effects and doping by metal or other metal oxides which will change the microstructure and morphology of the metal oxides. Different parameters that affect the performances like sensitivity, stability, and selectivity of gas sensors are discussed in this paper. Performances of the most operated metal oxides with strengths and limitations in ammonia gas sensing application are reviewed. The challenges for the development of high sensitive and selective ammonia gas sensor are also discussed.

scholarly journals Preparation and Gas Sensing Properties of PANI/SnO2 Hybrid Material

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1360
Author(s):  
Qiaohua Feng ◽  
Huanhuan Zhang ◽  
Yunbo Shi ◽  
Xiaoyu Yu ◽  
Guangdong Lan
Keyword(s):  
Hybrid Material ◽  
Room Temperature ◽  
Tin Dioxide ◽  
Gas Adsorption ◽  
Gas Sensing ◽  
Oxidative Polymerization ◽  
Environmental Pollutants ◽  
Decomposition Temperature ◽  
Benzene Vapor ◽  
Thermo Gravimetric Analyzer

A sensor operating at room temperature has low power consumption and is beneficial for the detection of environmental pollutants such as ammonia and benzene vapor. In this study, polyaniline (PANI) is made from aniline under acidic conditions by chemical oxidative polymerization and doped with tin dioxide (SnO2) at a specific percentage. The PANI/SnO2 hybrid material obtained is then ground at room temperature. The results of scanning electron microscopy show that the prepared powder comprises nanoscale particles and has good dispersibility, which is conducive to gas adsorption. The thermal decomposition temperature of the powder and its stability are measured using a differential thermo gravimetric analyzer. At 20 °C, the ammonia gas and benzene vapor gas sensing of the PANI/SnO2 hybrid material was tested at concentrations of between 1 and 7 ppm of ammonia and between 0.4 and 90 ppm of benzene vapor. The tests show that the response sensitivities to ammonia and benzene vapor are essentially linear. The sensing mechanisms of the PANI/SnO2 hybrid material to ammonia and benzene vapors were analyzed. The results demonstrate that doped SnO2 significantly affects the sensitivity, response time, and recovery time of the PANI material.

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