Effect of Environmental Temperature and Humidity on Different Metal Oxide Gas Sensors at Various Gas Concentration Levels

Abdullah, Abdulnasser Nabil; Kamarudin, Kamarulzaman; Zakaria, Syed Muhammad Mamduh Syed; Adom, Abdul Hamid; Juffry, Zaffry Hadi Mohd

doi:10.1088/1757-899x/864/1/012152

Cited by 20 publications

(12 citation statements)

References 7 publications

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“…The impact of environmental temperature on MOS sensor performance is well known (Huerta et al 2016; Abdullah et al 2020). Our tests evidenced that sensor sensitivity remained relatively steady at water temperatures between 18°C and 30°C.…”

Section: Discussionmentioning

confidence: 99%

Use of metal oxide semiconductor sensors to measure methane in aquatic ecosystems in the presence of cross‐interfering compounds

Butturini

Fonollosa

2022

Limnology & Ocean Methods

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Monitoring dissolved methane in aquatic ecosystems contributes significantly to advancing our understanding of the carbon cycle in these habitats and capturing their impact on methane emissions. Low‐cost metal oxide semiconductors (MOS) gas sensors are becoming an increasingly attractive tool to perform such measurements, especially at the air–water interface. However, the performance of MOS sensors in aquatic environmental sciences has come under scrutiny because of their cross‐sensitivity to temperature, moisture, and sulfide interference. In this study, we evaluated the performance and limitations of a MOS methane sensor when measuring dissolved methane in waters. A MOS sensor was encapsulated in a hydrophobic extended polytetrafluoroethylene membrane to impede contact with water but allow gas perfusion. Therefore, the membrane enabled us to submerge the sensor in water and overcome cross‐sensitivity to humidity. A simple portable, low‐energy, flow‐through cell system was assembled that included an encapsulated MOS sensor and a temperature sensor. Waters (with or without methane) were injected into the flow cell at a constant rate by a peristaltic pump. The signals from the two sensors were recorded continuously with a cost‐efficient microcontroller. Tests specifically focused on the effect of water temperature and sulfide interference on sensor performance. Our experiments revealed that the lower limit of the sensor was in the range of 0.1–0.2 μmol L−1 and that it provided a stable response at water temperatures in the range of 18.5–28°C. Dissolved sulfide at a concentration of 0.4 mmol L−1 or higher interfered with the sensor response, especially at low methane concentrations (0.5 μmol L−1 or lower). However, we show that if dissolved sulfide is monitored, its interference can be alleviated.

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Section: Discussionmentioning

confidence: 99%

Use of metal oxide semiconductor sensors to measure methane in aquatic ecosystems in the presence of cross‐interfering compounds

Butturini

Fonollosa

2022

Limnology & Ocean Methods

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“…When the humidity level in the environment increases, the sensitivity of gas sensors declines. The reason behind this decrease in sensitivity may be a reduction in the baseline resistance due to the interaction between oxygen molecules and water . There is reduced adsorption of O 2 ions on the surface of the sensing layer due to the adsorption of H 2 O molecules, resulting in a decrease in the active surface area of the sensing element .…”

Section: Factors Affecting Gas Sensing Of Nanocompositesmentioning

confidence: 99%

Hybrid Metal Oxide Nanocomposites for Gas-Sensing Applications: A Review

Berwal,

Sihag,

Rani

et al. 2023

Ind. Eng. Chem. Res.

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Nowadays, environmental pollution is a major concern due to toxic gases released by an increased number of vehicles, industries, and manufacturing plants worldwide. These toxic gases are the leading cause of severe health issues and environmental safety. There is an immediate need to develop cost-effective and efficient gas sensors to monitor the presence of toxic gases in our environment, so that preventive steps can be taken promptly to save human lives. Researchers have rigorously worked on this for the last three decades and have produced a diverse range of gas sensors that can detect even trace amounts of gases. The selection of an appropriate material is critical to design a gas sensor with excellent sensing properties. Different materials like 2D nanomaterials (graphene oxide, transition metals dichalcogenides (TMDCs), metal oxide semiconductors (MOX), organics, etc.) have been widely investigated by researchers to develop highly sensitive and selective sensors. This review is focused on the use of various hybrid and nanocomposite materials for the development of potential gas sensor devices and their applications. Different types of sensing mechanisms and effects of various parameters on the responses of gas sensors along with future promises of nanocomposite gas sensors are discussed in detail.

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“…In addition, the characteristics and response of the MOX sensor are highly affected by the temperature of the metal oxide layer. The temperature range of the layer is said to lie between 200 • C and 500 • C [26][27][28] and is achieved using a built-in heater resistor. This temperature range is essential for stimulating the relevant chemical reaction and improving its selectivity and response rate [26].…”

Section: Metal Oxide Gas Sensormentioning

confidence: 99%

“…A sensor array module was developed that consisted of sensor arrays and was covered by a partially closed chamber, as shown in Figure 2 [27,28]. Four sensors were studied in response to ethanol.…”

Section: Sensor Array Module and Partially Closed Chambermentioning

confidence: 99%

Correction Model for Metal Oxide Sensor Drift Caused by Ambient Temperature and Humidity

Abdullah

Kamarudin

Adom

et al. 2022

Sensors

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For decades, Metal oxide (MOX) gas sensors have been commercially available and used in various applications such as the Smart City, gas monitoring, and safety due to advantages such as high sensitivity, a high detection range, fast reaction time, and cost-effectiveness. However, several factors affect the sensing ability of MOX gas sensors. This article presents the results of a study on the cross-sensitivity of MOX gas sensors toward ambient temperature and humidity. A gas sensor array consisting of temperature and humidity sensors and four different MOX gas sensors (MiCS-5524, GM-402B, GM-502B, and MiCS-6814) was developed. The sensors were subjected to various relative gas concentrations, temperatures (from 16 °C to 30 °C), and humidity levels (from 75% to 45%), representing a typical indoor environment. The results proved that the gas sensor responses were significantly affected by the temperature and humidity. The increased temperature and humidity levels led to a decreased response for all sensors, except for MiCS-6814, which showed the opposite response. Hence, this work proposed regression models for each sensor, which can correct the gas sensor response drift caused by the ambient temperature and humidity variations. The models were validated, and the standard deviations of the corrected sensor response were found to be 1.66 kΩ, 13.17 kΩ, 29.67 kΩ, and 0.12 kΩ, respectively. These values are much smaller compared to the raw sensor response (i.e., 18.22, 24.33 kΩ, 95.18 kΩ, and 2.99 kΩ), indicating that the model provided a more stable output and minimised the drift. Overall, the results also proved that the models can be used for MOX gas sensors employed in the training process, as well as for other sets of gas sensors.

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Effect of Environmental Temperature and Humidity on Different Metal Oxide Gas Sensors at Various Gas Concentration Levels

Cited by 20 publications

References 7 publications

Use of metal oxide semiconductor sensors to measure methane in aquatic ecosystems in the presence of cross‐interfering compounds

Use of metal oxide semiconductor sensors to measure methane in aquatic ecosystems in the presence of cross‐interfering compounds

Hybrid Metal Oxide Nanocomposites for Gas-Sensing Applications: A Review

Correction Model for Metal Oxide Sensor Drift Caused by Ambient Temperature and Humidity

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