Carbon Dioxide Gas Sensor Using SAW Device Based on ZnO Film

Wen, Chang; Ju, Yong Feng; Li, Wan Lin; Sun, Wen Zheng; Xin, Xu; Shao, Yan; Li, Yan Ming; Li, Wen

doi:10.4028/www.scientific.net/amm.135-136.347

Cited by 9 publications

(5 citation statements)

References 10 publications

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“…As such, there is a great demand for a wireless and passive gas sensor to enable effective monitoring. To date, various wireless sensing devices have been created to monitor harmful gases, which use different measuring mechanisms, such as surface acoustic wave (SAW) [6][7][8], wireless passive LC resonance [9,10], and microwave evanescent mode [11,12], etc.…”

Section: Introductionmentioning

confidence: 99%

A Novel-Structure LC Resonant Passive Wireless Sensor for NO2 Sensing

et al. 2023

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This work presents an LC resonant passive wireless gas sensor with a novel structure designed to mitigate the negative impact of substrate. The LC sensor antenna in the new structure, and the reader antenna, were designed and optimized utilizing HFSS software to improve the transfer efficiency. The superiority of the designed structure compared with general examples is highlighted and verified. The change in the substrate capacitance essentially makes no interference with the parameters of the LC sensor to be measured. The sensor for the new structure was prepared by combining etching and sputtering methods. The ZnO nanowires (NWs) were characterized to confirm their high purity and wurtzite crystal structure. The LC gas sensors demonstrated excellent wireless sensing performance, including a low detection limit of 0.5 ppm NO2, high response of 1.051 and outstanding stability at 180 °C. The newly developed sensor structure not only prevented interference from the substrate during gas sensing testing, but also expanded the choice of sensor substrates, playing a critical role in the development of sensors based on the LC resonance principle.

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Section: Introductionmentioning

confidence: 99%

A Novel-Structure LC Resonant Passive Wireless Sensor for NO2 Sensing

et al. 2023

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“…Since the beginning of industrialisation, the combustion of fossil fuels, the operation of motor vehicles and industrial plants, the generation of electricity, as well as, the deforestation have caused the increase of atmospheric CO 2 concentration by one-third from 280 to 412 ppm (Baik and Jang, 2020; Wen et al , 2012). In the face of rapid urbanisation and industrialisation, the gradual increase of CO 2 emissions becomes a major concern worldwide in the following years, damaging both the environment and human health (Çolak and Karaköse, 2019; Joshi et al , 2019).…”

Section: Introductionmentioning

confidence: 99%

ZnO-based chemi-resistive sensors for CO₂ detection: a review

Stramarkou

Bardakas

Krokida

et al. 2022

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Purpose Carbon dioxide (CO2) has attracted special scientific interest over the last years mainly because of its relation to climate change and indoor air quality. Except for this, CO2 can be used as an indicator of food freshness, patients’ clinical state and fire detection. Therefore, the accurate monitoring and controlling of CO2 levels are imperative. The development of highly sensitive, selective and reliable sensors that can efficiently distinguish CO2 in various conditions of temperature, humidity and other gases’ interference is the subject of intensive research with chemi-resistive zinc oxide (ZnO)-based sensors holding a privileged position. Several ZnO nanostructures have been used in sensing applications because of their versatile features. However, the deficient selectivity and long-term stability remain major concerns, especially when operating at room temperature. This study aims to encompass an extensive study of CO2 chemi-resistive sensors based on ZnO, introducing the most significant advances of recent years and the best strategies for enhancing ZnO sensing properties. Design/methodology/approach An overview of the different ZnO nanostructures used for CO2 sensing and their synthesis methods is presented, focusing on the parameters that highly affect the sensing mechanism and, thus, the performance of CO2 sensors. Findings The selectivity and sensitivity of ZnO sensors can be enhanced by adjusting various parameters during their synthesis and by doping or treating ZnO with suitable materials. Originality/value This paper summarises the advances in the rapidly evolving field of CO2 sensing by ZnO sensors and provides research directions for optimised sensors in the future.

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“…Surface Acoustic Wave (SAW) nanosensors for various types of gases with sensitive elements made of nanofilms, such as graphene oxide (Balashov et al, 2013;Xuan et al, 2015), carbon nanotubes decorated with nanoparticles (Sivaramakrishnan et al, 2008), or nanorods of zinc oxide (Wen et al, 2011), present excellent sensitivity and a short response time. The sensitive elements in such sensors are the thin films with thickness on the order of nanometers that guarantee the short response and recovery times of the device.…”

Section: Introductionmentioning

confidence: 99%

Improved Stability and Performance of Surface Acoustic Wave Nanosensors Using a Digital Temperature Compensation

Balashov

Rocha²,

Hurtado³

et al. 2021

Front. Sens.

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Surface Acoustic Waves (SAW) sensors are known to be an excellent choice for the measurement of a small concentration of analytes in gas mixtures. The use of this type of sensor has been limited until now in the industrial environment due to the sensitivity of its response to temperature variations. To overcome this problem, thermal stabilization of equipment is normally used. We propose here a simple procedure of compensation of thermal drift in SAW sensors, allowing the measurements to be performed in temperature intervals of up to 20 degrees without any thermal stabilization of the sensitive element of a sensor. By monitoring the temperature of the key points of the sensor and applying the proposed polynomial compensation, it is possible to reduce the influence of thermal instabilities of the ambient temperature to the response more than four times. The method is illustrated by a temperature compensated SAW humidity sensor with a graphene oxide nanofilm as water molecules’ sensitive element. The results show enhanced performance of the sensor over a large temperature interval.

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Carbon Dioxide Gas Sensor Using SAW Device Based on ZnO Film

Cited by 9 publications

References 10 publications

A Novel-Structure LC Resonant Passive Wireless Sensor for NO2 Sensing

A Novel-Structure LC Resonant Passive Wireless Sensor for NO2 Sensing

ZnO-based chemi-resistive sensors for CO₂ detection: a review

Improved Stability and Performance of Surface Acoustic Wave Nanosensors Using a Digital Temperature Compensation

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Carbon Dioxide Gas Sensor Using SAW Device Based on ZnO Film

Cited by 9 publications

References 10 publications

A Novel-Structure LC Resonant Passive Wireless Sensor for NO2 Sensing

A Novel-Structure LC Resonant Passive Wireless Sensor for NO2 Sensing

ZnO-based chemi-resistive sensors for CO2 detection: a review

Improved Stability and Performance of Surface Acoustic Wave Nanosensors Using a Digital Temperature Compensation

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ZnO-based chemi-resistive sensors for CO₂ detection: a review