Search query: Semiconductor metal oxide gas sensors: A review

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abstract: Abstract This review paper encompasses a detailed study of semiconductor metal oxide (SMO) gas sensors. It provides for a detailed comparison of SMO gas sensors with other gas sensors, especially for ammonia gas sensing. Different parameters which affect the performance (sensitivity, selectivity and stability) of SMO gas sensors are discussed here under. This paper also gives an insight about the dopant or impurity induced variations in the SMO materials used for gas sensing. It is concluded that dopants enhance the properties of SMOs for gas sensing applications by changing their microstructure and morphology, activation energy, electronic structure or band gap of the metal oxides. In some cases, dopants create defects in SMOs by generating oxygen vacancy or by forming solid solutions. These defects enhance the gas sensing properties. Different nanostructures (nanowires, nanotubes, heterojunctions) other than nanopowders have also been studied in this review. At the end, examples of SMOs are given to illustrate the potential use of different SMO materials for gas sensing.
author_names: Ananya Dey
title: Semiconductor metal oxide gas sensors: A review
year: 2018

author_names: K Govardhan

G Nirmala
title: Metal/Metal Oxide Doped Semiconductor Based Metal Oxide Gas Sensors A Review
year: 2016

abstract: Abstract Semiconductor metal oxide nanowires (SMO NWs) show great potential for novel gas sensor applications because of their distinct properties, such as a high surface area to volume aspect ratio, high crystallinity and perfect pathway for electron transfer (length of NW) SMO NW sensors can be configured as resistors or field effect transistors for gas detection and different configurations, such as a single NW, multiple NWs, and networked NW films, have been established. Surface functionalizing NWs with catalyst elements and self heating NWs provide additional advantages for highly selective and low power consumption gas sensors. However, an appropriate design of SMO NWs is of practical importance in enhancing the gas sensing performance of SMO NW sensors. The on chip growth of SMO NWs possesses many advantages which can thus be effectively used for the large scale fabrication of SMO NW sensors with improved gas response and stability. This review aims to provide up to date information on the on chip fabrication of SnO2, ZnO, WO3, CuO, and other SMO NW sensors. It also discusses a variety of promising approaches that help advance the on chip fabrication of SMO NW based gas sensors and other NW based devices.
author_names: Chu Manh Hung

Dang Thi Thanh Le

Nguyen Van Hieu
title: On chip growth of semiconductor metal oxide nanowires for gas sensors: A review
year: 2017

abstract: Conductometric gas sensors facilitated by photons have been investigated for decades. Light illumination may enhance device attributes including operational temperature, sensing sensitivity and selectivity. This paper aims to provide an overview on the progress of light activated gas sensors, with a specific focus on sensors based on metal oxides. The material systems that have been studied include pure metal oxides, heterostructures of semiconductor metal oxides and metal metal oxides, and metal oxides with dopant. Other reported works on the use of different nanostructures such as one dimensional and porous nanostructures, study of sensing mechanisms and the interplay between various factors are also summarized. Possible directions for further improvement of sensing properties, through optimizing the size of nanomaterials, film thickness, light intensity and wavelength are discussed. Finally, we point out that the main challenge faced by light activated gas sensors is their low optical response, and we have analyzed the feasibility of using localized surface plasmon resonance to solve this drawback. This article should offer readers some key and instructive insights into the current and future development of light activated gas sensors.
author_names: Fang Xu

Ho-Pui Ho
title: Light Activated Metal Oxide Gas Sensors: A Review
venue: Micromachines
year: 2017

abstract: This paper gives a statistical view about important contributions and advances on semiconductor metal oxide (SMO) compounds based gas sensors developed to detect the air pollutants such as liquefied petroleum gas (LPG) H2S, NH3, CO2, acetone, ethanol, other volatile compounds and hazardous gases. Moreover, it is revealed that the alloy/composite made up of SMO gas sensors show better gas response than their counterpart single component gas sensors, i.e. they are found to enhance the 4S characteristics namely speed, sensitivity, selectivity and stability. Improvement of such types of sensors used for detection of various air pollutants, which are reported in last two decades, is highlighted herein.
author_names: S J Patil

Arun Vitthal Patil

C G Dighavkar

K S Thakare

Ratan Yadav Borase

S J Nandre

Nishad G Deshpande

R R Ahire
title: Semiconductor metal oxide compounds based gas sensors: A literature review
venue: Frontiers of Materials Science
year: 2015

abstract: Surface acoustic wave (SAW) gas sensors are of continuous development interest to researchers due to their sensitivity, short detection time, and reliability. Among the most used materials to achieve the sensitive film of SAW sensors are metal oxide semiconductors, which are highlighted by thermal and chemical stability, by the presence on their surface of free electrons and also by the possibility of being used in different morphologies. For different types of gases, certain metal oxide semiconductors are used, and ZnO is an important representative for this category of materials in the field of sensors. Having a great potential for the development of SAW sensors, the discussion related to the development of the sensitivity of metal oxide semiconductors, especially ZnO, by the synthesis method or by obtaining new materials, is suitable and necessary to have an overview of the latest results in this domain.
author_names: Izabela Constantinoiu

Cristian Viespe
title: ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review
venue: Sensors
year: 2020

abstract: In modern world, gas sensors play important role in many fields of technology used for air pollution, breath analysis, public safety and many others. Gas sensor based semiconductor metal oxide is mostly used in these applications because of low cost, ease to use, high sensitivity and lower power consumption. This paper gives an overview about the semiconductor metal oxide and reviews why using it as sensing of gases in electrical applications and then it addresses to the work mechanism of a sensor to sensing H2S gas.
author_names: Zaid Hameed Mahmoud

Omar Dhaa Abdalstar

Noor us Sabah
title: Semiconductor Metal Oxide Nanoparticles: A Review for the Potential of H2S Gas Sensor Application
year: 2020

abstract: Abstract Air pollution is nowadays a big issue regarding the health of human beings. Among the toxic gases emitted in the atmosphere, NO2 is the most problematic one and a lot of countries or cities want to monitor its concentration in order to be able to take measures to reduce it. Therefore, it is urgent to develop NO2 sensors with high performance, low power consumption and low cost. Several technologies have been developed for this purpose. A very popular technology is based on metal oxide semiconductor. The usual semiconductor gas sensors need to be operated at high temperature, but nowadays many efforts are put on metal oxide sensors that can work at room temperature. These sensors present many advantages: low power consumption, low manufacturing cost, as well as moderate stability and safety. However, due to the weak response to NO2 at room temperature, most semiconductor NO2 sensors need to be adapted. This review will present the main strategies and material modification methods studied so far. These include light illumination, sensitization with an organic, formation of heterojunctions, preparation of composites with 1D or 2D materials and an introduction of oxygen vacancies in high concentrations. The gas sensing mechanisms of these sensors are presented and discussed.
author_names: C Zhang

Yifan Luo

Jiaqiang Xu

Marc Debliquy
title: Room temperature conductive type metal oxide semiconductor gas sensors for NO2 detection
venue: Sensors and Actuators A: Physical
year: 2019

abstract: Abstract Flammable, explosive and toxic gases, such as hydrogen, hydrogen sulfide and volatile organic compounds vapor, are major threats to the ecological environment safety and human health. Among the available technologies, gas sensing is a vital component, and has been widely studied in literature for early detection and warning. As a metal oxide semiconductor, zinc ferrite (ZnFe2O4) represents a kind of promising gas sensing material with a spinel structure, which also shows a fine gas sensing performance to reducing gases. Due to its great potentials and widespread applications, this article is intended to provide a review on the latest development in zinc ferrite based gas sensors. We first discuss the general gas sensing mechanism of ZnFe2O4 sensor. This is followed by a review of the recent progress about zinc ferrite based gas sensors from several aspects: different micro morphology, element doping and heterostructure materials. In the end, we propose that combining ZnFe2O4 which provides unique microstructure (such as the multi layer porous shells hollow structure) with the semiconductors such as graphene, which provide excellent physical properties. It is expected that the mentioned composites contribute to improving selectivity, long term stability, and other sensing performance of sensors at room or low temperature.
author_names: Kaidi Wu

Jianzhi Li

C Zhang
title: Zinc ferrite based gas sensors: A review
venue: Ceramics International
year: 2019

abstract: Abstract Metal oxide semiconductor (MOS) gas sensors possess extensive applications due to their high sensitivity, low cost, and simplicity. To boost their excellent sensing performance and meet the growing demand for applications, a series of strategies have been developed, such as the surface morphology engineering and function manipulation. Recently, the controlled morphology with exposed high energy facets and the facet dependent sensing properties have attracted much attention. Because of its abundant unsaturated active sites, the crystal planes with high surface energy usually serve as promising platform for gas sensing. After a lot of survey of literature, the authors provide a review of recent efforts on engineering crystal structures with exposed high energy facets of MOS nanomaterials and their improved gas sensitive performance, emphasis on six kinds of common gas sensitive MOS including ZnO, SnO2, TiO2, a Fe2O3, NiO and Cu2O. Also, the relationship between dangling bonds density and gas sensing properties has been systematically discussed and used as one significant factor to evaluate superior sensing surface of MOS. According to the research and calculation, surface engineering by selectively exposing high energy facets provides an effective way to obtain MOS gas sensitive materials with superior performance. The understanding of the facet dependent properties of MOS will assist in and guide the fabrication of more excellent gas sensors in the future.
author_names: Xing Gao

Tong Zhang
title: An overview: Facet dependent metal oxide semiconductor gas sensors
year: 2018