Basics of semiconducting metal oxide–based gas sensors

Oprea, A.; Degler, David; Bârsan, Nicolae; Hémeryck, Anne; Rebholz, Julia

doi:10.1016/b978-0-12-811224-3.00003-2

Cited by 22 publications

(15 citation statements)

References 299 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 The sensing performance of MOX-based gas sensors strongly depends on the electrical conduction, which is affected by the number of charge carriers and active sites available on the surface, of the sensing material. 4 Large specific surface area and point defects, which promotes adsorption and desorption of oxygen ions and gas atoms from the sensor materials, as well as morphology and crystallographic structures, are factors reported to have an influence on the gas-sensing performance. 5 Most of the gas sensor research thus far was directed toward using n-type MOX semiconductors, such as CeO 2 , SnO 2 , WO 3 , or ZnO for gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Underpinning the Interaction between NO₂ and CuO Nanoplatelets at Room Temperature by Tailoring Synthesis Reaction Base and Time

et al. 2019

View full text Add to dashboard Cite

An approach to tailor the morphology and sensing characteristics of CuO nanoplatelets for selective detection of NO2 gas is of great significance and an important step toward achieving the challenge of improving air quality and in assuring the safety of mining operations. As a result, in this study, we report on the NO2 room temperature gas-sensing characteristics of CuO nanoplatelets and the underlying mechanism toward the gas-sensing performance by altering the synthesis reaction base and time. High sensitivity of ∼40 ppm–1 to NO2 gas at room temperature has been realized for gas sensors fabricated from CuO nanoplatelets, using NaOH as base for reaction times of 45 and 60 min, respectively at 75 °C. In both cases, the crystallite size, surface area, and hole concentration of the respective materials influenced the selectivity and sensitivity of the NO2 gas sensors. The mechanism underpinning the superior NO2 gas sensing are thoroughly discussed in terms of the crystallite size, hole concentration, and surface area as active sites for gas adsorption.

show abstract

Section: Introductionmentioning

confidence: 99%

Underpinning the Interaction between NO₂ and CuO Nanoplatelets at Room Temperature by Tailoring Synthesis Reaction Base and Time

et al. 2019

View full text Add to dashboard Cite

show abstract

“…“ Operando ” refers to performing under application‐ relevant conditions on real sensor devices and involves the real‐ time evaluation of the sensor performance of the probed specimen. [ 18,76 ]…”

Section: Characterization Of Oxygen Defects In Nanostructured Metal Omentioning

confidence: 99%

“…These spectroscopic techniques were developed from an in situ to a powerful operando technique for gas sensor research within a few years. [ 18,56,79,80‐81 ] For example, Chen et al . employed the in situ diffuse reflectance infrared Fourier transform spectroscopy ( in situ DRIFTS) technique…”

Section: Characterization Of Oxygen Defects In Nanostructured Metal Omentioning

confidence: 99%

“…metal oxides is discussed in detail in chapter 3 of a recent book. [ 18 ] The combination of spectroscopy and electrical characterization techniques will bring fundamental insights into role of oxygen vacancies on the electrical characteristics of MOS materials, and thus lead to understanding the structure‐activity relationships between vacancy engineering and gas sensing ability.…”

Section: Gas Sensing Properties Tailored By Oxygen Vacancy Engineeringmentioning

confidence: 99%

“…[ 12‐16 ] However, there was few review regarding the role of oxygen vacancies in gas sensing. [ 17‐18 ] In general, oxygen vacancies can improve gas sensing performance in two ways: 1) change the surrounding electron density, helping the adsorption of target gas molecules, 2) improve the electrical conductivity by moving down the conduction band to reduce the distance for electrons arrival. It is still necessary to more systematically and deeply understand the role of oxygen vacancies in metal‐oxide gas sensors when designing oxygen‐defective metal oxide sensing materials.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges^†

Ding

Liu

et al. 2020

Chin. J. Chem.

View full text Add to dashboard Cite

Defect engineering has been the most promising strategy to modulate the surface microstructure and electronic structure of the metal oxides, which will govern the efficiency of a given oxide for the applications in heterogeneous catalysis, energy storage and conversion fields, and gas sensing. This review summarizes recent research advances on understanding the role of oxygen vacancies of the metal oxides in gas sensing. First, different strategies for oxygen vacancy productions are summarized and compared. Then, the proper characterization techniques for oxygen vacancy are introduced. Importantly, the structure-activity relationships between vacancy engineering and gas sensing ability are further illustrated coupling the experimental results and theoretical studies. Finally, the key challenges and prospects regarding defect engineering in gas sensing are highlighted. Wenjie Ding (left) obtained his bachelor degree from Beijing Forestry University in 2018. Currently, he is pursuing his master degree under the supervision of Associate Professor Jiajia Liu in Beijing Instituted of Technology, China. His current research interests mainly focus on the synthesis of nanomaterials for the application of gas sensing. Dr. Jiajia Liu (middle) received her PhD degree in 2010 from Department of Chemical & Biomolecular Engineering of National University of Singapore, Singapore. Currently, she is Associate Professor in School of Materials and Engineering, Beijing Institute of Technology, China. Her current research interest is the development of metal oxide nanostructures and their applications in sensor, catalysis, and optoelectronics. Jiatao Zhang (right) was born in 1975. He earned his PhD from the Department of Chemistry, Tsinghua University, in 2006. Currently, he is Xu Teli Professor in the School of Materials and Engineering, BIT. He was awarded the Excellent Young Scientist foundation of NSFC in 2013. He also serves as the director of Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications. His current research interest is inorganic chemistry of semiconductor-based hybrid nanostructures with novel optical, electronic properties for the applications in energy conversion and storage, catalysis, optoelectronics and biology.

show abstract

CVD Grown Tungsten Oxide for Low Temperature Hydrogen Sensing: Tuning Surface Characteristics via Materials Processing for Sensing Applications

Wilken

Çiftyürek

Cwik

et al. 2022

Small

View full text Add to dashboard Cite

a wide bandgap of 2.68 eV [6] and electrical conductivities ranging between 10 −6 to 10 −4 (Ω cm −2 ) [7] Various stable oxides and suboxides of tungsten can exist on the surface such as WO, WO 2 , W 2 O 3 , W 4 O 3 , W 17 O 47 , W 18 O 49 , and WO 3 (in an oxygen-deficient form WO 3−x ). [8] Here, the oxidation states of tungsten varies from +II to +VI. [9] Owing to this range of possible stoichiometries accompanied by charged surface defects, tungsten oxide preserves typical n-type semiconducting behavior and thus, catalytic activity toward different gases, enabling application in chemical gas sensors. [1,10] Sensors employing tungsten oxide (WO 3 ) in several micro-and nanostructures were used for the detection of a variety of gases such as, sulfur dioxide (SO 2 ), [11] hydrogen sulfide (H 2 S), [11,12] ozone (O 3 ), [12] nitrogen oxide (NO x ), [12][13][14] dimethylacetamide (DMAC, Me(CO)NMe 2 ), [12] trimethylamine (NMe 3 ), [15] acetone, [14] ammonia (NH 3 ), [12] oxygen (O 2 ) [9] and water (H 2 O). [9,14] In particular for hydrogen (H 2 ), [12,16] tungsten oxide has shown good sensing properties highlighting the interest of this material, as hydrogen is as an attractive source for renewable energy due to its naturally exhaustible by-products (H 2 O) without filtration. However, there are some challenges and one of them is to develop efficient procedures for H 2 storage. Due to its almost instantaneous diffusion rate, comfort in penetration through almost all materials, the development of dedicated safety measures to monitor storage and flow systems is equally important.

show abstract

Basics of semiconducting metal oxide–based gas sensors

Cited by 22 publications

References 299 publications

Underpinning the Interaction between NO₂ and CuO Nanoplatelets at Room Temperature by Tailoring Synthesis Reaction Base and Time

Underpinning the Interaction between NO₂ and CuO Nanoplatelets at Room Temperature by Tailoring Synthesis Reaction Base and Time

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges^†

CVD Grown Tungsten Oxide for Low Temperature Hydrogen Sensing: Tuning Surface Characteristics via Materials Processing for Sensing Applications

Contact Info

Product

Resources

About

Basics of semiconducting metal oxide–based gas sensors

Cited by 22 publications

References 299 publications

Underpinning the Interaction between NO2 and CuO Nanoplatelets at Room Temperature by Tailoring Synthesis Reaction Base and Time

Underpinning the Interaction between NO2 and CuO Nanoplatelets at Room Temperature by Tailoring Synthesis Reaction Base and Time

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges†

CVD Grown Tungsten Oxide for Low Temperature Hydrogen Sensing: Tuning Surface Characteristics via Materials Processing for Sensing Applications

Contact Info

Product

Resources

About

Underpinning the Interaction between NO₂ and CuO Nanoplatelets at Room Temperature by Tailoring Synthesis Reaction Base and Time

Underpinning the Interaction between NO₂ and CuO Nanoplatelets at Room Temperature by Tailoring Synthesis Reaction Base and Time

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges^†