Journal ArticleDOI
Fluctuation enhanced gas sensing with WO3-based nanoparticle gas sensors modulated by UV light at selected wavelengths
Maciej Trawka,Janusz Smulko,Lech Hasse,Claes-Göran Granqvist,Fatima Ezahra Annanouch,Radu Ionescu +5 more
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In this paper, the authors used fluctuation-enhanced gas sensing, based on measurements of resistance fluctuations in the gas sensor, to study the effects of such modulation on the noise intensity for ambient atmospheres of synthetic air without and with additions of small amounts of ethanol, methane and formaldehyde.Abstract:
The sensitivity and selectivity of WO 3 -based gas sensors can be enhanced by UV-irradiation-induced modulation, especially if different wavelengths are employed. We used fluctuation-enhanced gas sensing, based on measurements of resistance fluctuations in the gas sensor, to study the effects of such modulation on the noise intensity for ambient atmospheres of synthetic air without and with additions of small amounts of ethanol, methane and formaldehyde. Our data confirmed that the method is energy efficient and can be applied to improve gas detection sensitivity and selectivity. The results are strongly dependent on the gaseous species, and a single UV-modulated WO 3 -based gas sensor discriminate between different gases.read more
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A review on WO3 based gas sensors: Morphology control and enhanced sensing properties
TL;DR: In this article, the general approaches to tune the morphologies of Tungsten Oxide (WO3) are analyzed, and much more attention is particularly paid to improve the sensing-properties of WO3 based gas sensors.
Journal ArticleDOI
Understanding the Potential of WO3 Based Sensors for Breath Analysis
TL;DR: WO3 is reported to show high sensor responses to several biomarkers found in breath, e.g., acetone, ammonia, carbon monoxide, hydrogen sulfide, toluene, and nitric oxide, and modern material science allows WO3 samples to be tailored to address certain sensing needs.
Journal ArticleDOI
Light-Activated Metal Oxide Gas Sensors: A Review
TL;DR: It is pointed out that the main challenge faced by light-activated gas sensors is their low optical response, and the feasibility of using localized surface plasmon resonance to solve this drawback is analyzed.
Journal ArticleDOI
Correlation between the H2 response and its oxidation over TiO2 and N doped TiO2 under UV irradiation induced by Fermi level
TL;DR: In this article, the existence of surface defects over TiO2 (in-situ) would decrease the Fermi level (EF), resulting in the electron transfer from the adsorbed H2 to TiO 2.
Journal ArticleDOI
Substantially improved room temperature NO2 sensing in 2-dimensional SnS2 nanoflowers enabled by visible light illumination
Tae Hoon Eom,Sung Hwan Cho,Jun Min Suh,Taehoon Kim,Tae Hyung Lee,Sang Eon Jun,Jin Wook Yang,Jongwon Lee,Seong-Hyeon Hong,Ho Won Jang +9 more
TL;DR: In this paper, a room temperature nitrogen dioxide (NO2) sensing of SnS2 nanoflowers (NFs) enabled by visible light activation was proposed, where the high absorbance in the visible light region triggered the generation of charge carriers resulting in decreased resistance and enhanced gas sensing characteristics.
References
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Monodisperse α-Fe2O3 Mesoporous Microspheres: One-Step NaCl-Assisted Microwave-Solvothermal Preparation, Size Control and Photocatalytic Property
Shaowen Cao,Ying-Jie Zhu +1 more
TL;DR: A simple one-step NaCl-assisted microwave-solvothermal method has been developed for the preparation of monodisperse α-Fe2O3 mesoporous microspheres, and high photocatalytic activities in the degradation of salicylic acid are observed.
Journal ArticleDOI
Enhanced functionalization of Mn2O3@SiO2 core-shell nanostructures
TL;DR: The zeta potential study shows that the hydrolysis of organosilane to form the shell results in more number of functional groups on it as compared to the shell formed using post-grafting method.
Journal ArticleDOI
Gas response control through structural and chemical modification of metal oxide films: state of the art and approaches
TL;DR: In this paper, the structural and physical properties of nanoscaled metal oxide films (SnO2 and In2O3) aimed for solid state chemical sensors were analyzed and the methods suitable for control of these structural-and physical-chemical parameters have been discussed.
Book
Electronic noise and fluctuations in solids
TL;DR: A comprehensive and complete review of flicker (1/f) noise in the literature can be found in this paper, focusing on the physics of electronic fluctuations (noise) in solids.
Journal ArticleDOI
Extracting information from noise spectra of chemical sensors: single sensor electronic noses and tongues
TL;DR: In this paper, it was shown that even one single sensor may be sufficient for realizing an electronic nose or tongue, which can utilize noise data taken at the output of a chemical sensor.