Search query: semiconductors ozone sensor

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abstract: Abstract In this study, we successfully developed amorphous Indium Gallium Zinc Oxide (IGZO) thin film under ultraviolet irradiation that demonstrated high stability and high sensitivity in a high selectivity ozone gas sensor at ppb level concentrations. The experimental results show that the sensor can detect ozone levels ranging from 55 to 400 ppb with high stability and high repeatability. We also successfully detected concentrations of 10 16 ppb. Ozone changes of 2 5 ppb can be clearly distinguished. Using electron spectroscopy for chemical analysis, we identified the element ratio and ozone detection ability. Higher sensitivity is realized in the presence of oxygen deficiency in metal oxide semiconductors. By controlling ultraviolet intensity, we found the sensitivity of thin film to ozone and nitrogen dioxide to be inversely proportional to light intensity and light intensity can be used to improve gas selectivity. Strong intensity irradiated to sensor causes low sensitivity and high selectivity.
author_names: Chiu-Hsien Wu

Kai-Wei Chang

Yu-Ning Li

Zu-Yin Deng

Kuen-Lin Chen

Chien-Chung Jeng

R J Wu

Jau Han Chen
title: Improving the sensitive and selective of trace amount ozone sensor on Indium Gallium Zinc Oxide thin film by ultraviolet irradiation
year: 2018

abstract: Abstract Novel sensors based on Pt/TiO 2 WO 3 metal oxide semiconductors are a promising inexpensive alternative for commercial ozone monitoring. Pt doping promotes TiO 2 WO 3 composite material to respond to ozone, and the doped films presented a high sensor response. The sensing materials were characterized using scanning electron microscopy (SEM) transmission electron microscopy (TEM) X ray diffraction (XRD) and ultraviolet visible (UV vis) spectroscopy. When irradiated using a 460 nm light source, the sensor response of Pt/TiO 2 WO 3 (1:4) was 2712, and the recovery time was 85 s. Pt was doped with TiO 2 WO 3 to enhance the electron hole separation, and the sensor response increased. In addition, the recovery time decreased considerably. This study presents a discussion of the slowing of the electron and hole recombination on the surface of the sensing material caused by the charge transfer of the mixing band. Pt/TiO 2 WO 3 is a high response photocatalyst when irradiated by visible light in 2.5 ppm of ozone at room temperature.
author_names: Ming-Hung Chen

Chungshin Lu

R J Wu
title: Novel Pt/TiO2 WO3 materials irradiated by visible light used in a photoreductive ozone sensor
year: 2014

abstract: Metal oxide semiconductors (MOS) have attracted considerable interest from many researchers due to their numerous technological applications such gas sensor, particularly, operated at room temperature under UV illumination. In this work, we report the preparation of the ZnO SnO2 nanoheterostructures via microwave assisted sol gel route. The XRD measurements indicated the presence of both crystalline phases, i.e. ZnO and SnO2, without the evidence of solid solution formation. HRTEM analyses revealed that SnO2 nanoparticles (of ca. 5 nm) are attached onto ZnO rods, supporting the existence of junction between both oxides. Electrical measurements revealed that the heterostructures presented a high response to ppb levels of ozone and nitrogen dioxide at room temperature when kept under continuous UV light illumination.
author_names: Sandrine Bernardini

Ariadne C Catto

Tomas Fiorido

Marc Bendahan

Khalifa Aguir

Luis F da Silva
title: ZnO SnO2 Nanoheterostructures Microwave synthesis and UV enhaced gas sensing properties
year: 2019

abstract: Abstract Novel sensors based on tungsten trioxide (WO3) semiconductors have been found to hold much promise as a cheaper alternative for ozone monitoring. The sensitivity of the metal oxide to ozone is owed to the presence of surface oxygen vacancies. The filling of oxygen vacancies by the decomposing ozone traps free charge carriers with consequent measurable increase in resistance. A Langmuir type model simulating the fundamental surface reactions has been found to reproduce the measured sensor response. Using a temperature cycling technique in which the temperature of the sensor is alternated between 600 and 530 degC representing scrubbing and measurement resistances, respectively, ozone measurements have been obtained from several urban sites. Results from eight sensors show that the sensors have adequate sensitivity and response time with measurements comparable to ozone measured by UV absorption spectrometer (r.m.s. of variances up to 7 ppbv) Problems of apparent changes in sensor sensitivity in the course of field measurements have been explained by inadequate 'burn in' period prior to calibration and field deployment. The sensors should be run in ambient conditions for about a week before calibration.
author_names: S R Utembe

Graeme Hansford

Michael G Sanderson

R A Freshwater

Keith Francis Edwin Pratt

David E Williams

Richard A Cox

Roderic L Jones
title: An ozone monitoring instrument based on the tungsten trioxide (WO3) semiconductor
year: 2006

abstract: Abstract Tungsten trioxide (WO3) is considered as one of the most interesting materials in the field of gas sensors based on metals oxides semiconductors. We have shown in previous papers [K. Aguir, C. Lemire, D.B.B. Lollman, Electrical properties of reactively sputtered WO3 thin films as ozone gas sensor, Sens. Actuators B 84 (2002) 1 5; C. Lemire, D.B.B. Lollman, A.A. Mohammad, E. Gillet, K. Aguir, Sens. Actuators B 84 (2002) 43 48 [2] M. Bendahan, R. Boulmani, J. L. Seguin, K. Aguir, Characterization of ozone sensors based on WO3 reactively sputtered films: influence of O2 concentration in the sputtering gas and working temperature, Sens. Actuators B 100 (2004) 320 324] that structural and surface morphology of tungsten trioxide (WO3) thin films, prepared by RF sputtered, plays an important role in the gas detection mechanism. In this paper we have studied the impedance evolution of WO3 sensors versus time and working temperature, under dry air or/and ozone. The AC impedance spectroscopy is a powerful method to understand the nature of conduction processes and the mechanism of gas/solid interactions. The Nyquist response of the sample, as well as under dry air as well as under 0.1 ppm of O3, have been decomposed on R C parallel circuits. Then, we have shown, that the adsorption of oxygen mainly affects the characteristics of the space charge region at the grain boundaries.
author_names: Ahmed Labidi

Christian Jacolin

Marc Bendahan

Adnane Abdelghani

Jacques Guerin

Khalifa Aguir

M A Maaref
title: Impedance spectroscopy on WO3 gas sensor
year: 2005

abstract: In this paper we report some of the recent advances in transparent thin film oxide semiconductors, specifically zinc oxide (ZnO) produced by rf magnetron sputtering at room temperature with multifunctional properties. By controlling the deposition parameters it is possible to produce undoped material with electronic semiconductor properties or by doping it to get either n type or p type semiconductor behavior. In this work we refer our experience in producing n type doping ZnO as transparent electrode to be used in optoelectronic applications such as solar cells and position sensitive detectors while the undoped ZnO can be used as UV photodetector or ozone gas sensor or even as active layer of fully transparent thin film transistors.
author_names: Elvira Fortunato

Alexandra Goncalves

Antonio J S Marques

Ana Pimentel

Pedro Barquinha

Hugo Aguas

Luis Pereira

Leandro Jose Raniero

Goncalo Goncalves

Isabel Ferreira

Rodrigo Martins
title: Multifunctional Thin Film Zinc Oxide Semiconductors: Application to Electronic Devices
year: 2006

abstract: Abstract Solid electrolyte sensors for detecting air pollutants are urgently needed for the sake of environmental protection. Rapid progress is being marked in the development of sensors for CO 2 NO 2 NO, SO 2 ozone and fluorocarbons. Some of them, such as the CO 2 sensor, have almost reached a stage of practical application, while others are very promising. Most of these sensors have been fabricated with ceramic materials that are solid electrolytes and oxide semiconductors. The current status of research and development for air pollutant sensing is described briefly.
author_names: Noboru Yamazoe

Norio Miura
title: Environmental gas sensing
year: 1994

abstract: The thick films of oxide semiconductors such as and ZnO for the detection of sub ppm range have been prepared and their characteristics were investigated. It is showed that the optimum operating temperatures of the sensors are and for based and based thick films, and ZnO based thick films, respectively. Since the resistance of ZnO based thick films are extremely high( the signal to noise ratio was comparatively low. In order to determine the selectivity, the films are exposed to the interfering gases such as ozone, ammonia, methane and the mixture of carbon monoxide and propane. ZnO(3 wt. and (3 wt. thick film sensors show high sensitivity, good selectivity, excellent reproducibility and the linearity of concentration versus sensor resistance. The preliminary results clearly demonstrated that the sensor can be successfully applied for the detection of in sub ppm range.
author_names: Seung-Ryeol Kim

Dong Hyun Yun

Hyung-Ki Hong

Chul Han Kwon

Kyuchung Lee
title: $NO_{2} Sensing Properties of Oxide Semiconductor Thick Films
year: 1997

abstract: Abstract Monitoring the ozone concentration is widely needed in manufacturing. In this work, mesoporous Co 3 O 4 nanobricks were prepared by a facile hydrothermal corrosion method followed by thermal decomposition from CoSn(OH) 6 precursor. The morphologies, phase, surface composition, nanostructures and exposed crystal facet of the Co 3 O 4 were investigated by using XRD, SEM, TEM, XPS and Raman method. The Co 3 O 4 nanobricks are composed of ultrafine tricobalt tetroxide spinel nanocrystal with size about 10 nm, and the dominant exposed facet is {110} It is found that those Co 3 O 4 nanobricks show good response to n butanol and xylene gases, especially to ozone, which reaches the highest response of 130 to 100 ppm ozone at 85degC. In the end, the formation and gas sensing mechanism of the mesoporous Co 3 O 4 nanobricks were discussed. The good gas sensing properties of the Co 3 O 4 nanobricks can be ascribed to the ultrafine crystallite and mesoporous structure. The high ozone sensitivity can be explained by the {110} exposed facet with Co 2+ active sites. Based on the investigate, the Co 3 O 4 nanobricks is proved to be a promising material for ozone sensing.
author_names: Liming Liu

Ting Li

Zichuan Yi

Feng Chi

Zhidong Lin

Xiaowen Zhang

Kai Xu
title: Conductometric ozone sensor based on mesoporous ultrafine Co3O4 nanobricks
venue: Sensors and Actuators B: Chemical
year: 2019

abstract: Abstract Recent findings shed light on performing fundamental experiments for preparation of metal monolayer stanene, which is a zero band gap semiconductor material with buckled honeycomb structure. Stanene possesses outstanding physical and mechanical properties, and has been extensively investigated in the field of nanoelectronic devices. We performed a theoretical study on the adsorption behaviors of O3 and SO3 molecules on two dimensional stanene sheet in order to fully exploit the promising gas sensing capability of these materials. We examined the most stable structures of O3 and SO3 molecules adsorbed on the stanene, and examined the adsorption process in view of the energetics, charge transfers and electronic structure of the adsorption systems. The results indicate that the adsorption of gas molecules on the B doped stanene is more favorable in energy than that on the pristine one, representing the superior sensing performance of B doped system. Our charge analysis based on Mulliken charges reveals a charge transfer from the stanene sheet to the adsorbed O3 and SO3 molecules, as evidenced by charge accumulation on the adsorbed molecules. This indicates the gas molecules act as charge acceptors from the stanene sheet. The significant overlaps between the PDOS spectra of the interacting atoms indicate the formation of chemical bonds between these atoms. Our findings thus suggest that B doped stanene could be a highly efficient gas sensor device for SO3 and O3 detection in the environment.
author_names: Amirali Abbasi

Jaber Jahanbin Sardroodi
title: The adsorption of sulfur trioxide and ozone molecules on stanene nanosheets investigated by DFT: Applications to gas sensor devices
venue: Physica E: Low dimensional Systems and Nanostructures
year: 2019