Enhanced Carbon monoxide-sensing properties of Chromium-doped ZnO nanostructures

Habib, I. Y.; Tajuddin, Aimi Asilah Haji; Noor, Hafiz Armi; Lim, Chee Ming; Mahadi, Abdul Hanif; Thotagamuge, Roshan

doi:10.1038/s41598-019-45313-w

Cited by 59 publications

(39 citation statements)

References 39 publications

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“…In this context, there are some combined theoretical and experimental studies on doped ZnO-based CO sensors [ 100 , 101 ]. Thereby, there are two ways to conduct combined theoretical and experimental studies on doped ZnO-based CO sensors.…”

Section: Combined Dft and Experimental Investigations Of Doped Zno-based Co Sensorsmentioning

confidence: 99%

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Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Pineda-Reyes

Herrera-Rivera

Rojas-Chávez

et al. 2021

Sensors

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Monitoring and detecting carbon monoxide (CO) are critical because this gas is toxic and harmful to the ecosystem. In this respect, designing high-performance gas sensors for CO detection is necessary. Zinc oxide-based materials are promising for use as CO sensors, owing to their good sensing response, electrical performance, cost-effectiveness, long-term stability, low power consumption, ease of manufacturing, chemical stability, and non-toxicity. Nevertheless, further progress in gas sensing requires improving the selectivity and sensitivity, and lowering the operating temperature. Recently, different strategies have been implemented to improve the sensitivity and selectivity of ZnO to CO, highlighting the doping of ZnO. Many studies concluded that doped ZnO demonstrates better sensing properties than those of undoped ZnO in detecting CO. Therefore, in this review, we analyze and discuss, in detail, the recent advances in doped ZnO for CO sensing applications. First, experimental studies on ZnO doped with transition metals, boron group elements, and alkaline earth metals as CO sensors are comprehensively reviewed. We then focused on analyzing theoretical and combined experimental–theoretical studies. Finally, we present the conclusions and some perspectives for future investigations in the context of advancements in CO sensing using doped ZnO, which include room-temperature gas sensing.

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Section: Combined Dft and Experimental Investigations Of Doped Zno-based Co Sensorsmentioning

confidence: 99%

“…Another combined experimental–theoretical study investigated the use of Cr-doped ZnO nanostructures for CO sensing [ 101 ]. First, the Zn 12 O 12 and Cr-doped Zn 11 O 12 cluster properties were investigated using the B3LYP functional.…”

Section: Combined Dft and Experimental Investigations Of Doped Zno-based Co Sensorsmentioning

confidence: 99%

Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Pineda-Reyes

Herrera-Rivera

Rojas-Chávez

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…Nanomaterials are well-known to possess excellent electrical, optical, thermal, catalytic properties, and strong mechanical strength, which offer great opportunities to construct nanomaterials-based sensors or devices for monitoring environmental contaminations in air, water, and soil [ 10 ]. These sensors have many advantages like small size and optical band gap, as well as increased surface area [ 11 ] and fast response [ 12 ], when compared to traditional sensors.…”

Section: Introductionmentioning

confidence: 99%

Palladium-Doped Tin Oxide Nanosensor for the Detection of the Air Pollutant Carbon Monoxide Gas

Jebakumar

Juliet

2020

Sensors

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The exhaust gases from various sources cause air pollution, which is a leading contributor to the global disease burden. Hence, it has become vital to monitor and control the increasing pollutants coming out of the various sources into the environment. This paper has designed and developed a sensor material to determine the amount of carbon monoxide (CO), which is one of the major primary air pollutants produced by human activity. Nanoparticle-based sensors have several benefits in sensitivity and specificity over sensors made from traditional materials. In this study, tin oxide (SnO2), which has greater sensitivity to the target gas, is selected as the sensing material which selectively senses only CO. Tin oxide nanoparticles have been synthesized from stannous chloride dihydrate chemical compound by chemical precipitation method. Palladium, at the concentration of 0.1%, 0.2%, and 0.3% by weight, was added to tin oxide and the results were compared. Synthesized samples were characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) techniques. XRD revealed the tetragonal structure of the SnO2 nanoparticles and FESEM analysis showed the size of the nanoparticles to be about 7–20 nm. Further, the real-time sensor testing was performed and the results proved that the tin oxide sensor, doped with 0.2% palladium, senses the CO gas more efficiently with greater sensitivity.

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“…The metal oxide gas response (n-type such as ZnO, SnO 2 and p-type such as CuO and Cr 2 O 3 ) can be tailored in a number of ways in order to modulate selectivity and sensitivity via morphology tuning and chemical modification [23], e.g. by the surface modification [24,25] or solution based doping [26,27] to incorporate suitable additives such as noble metals [28]. , ZnO for example has a diverse number of growth morphology types, can be synthesised easily, and has a high electron mobility and thermal conductivity, as well as a wide and direct band gap making it suitable for a wide range of sensing applications [29].…”

Section: Introductionmentioning

confidence: 99%

Co-doped ZnO Nanowires for Low Temperature Methane Sensing Operational in Humid Environments

Morrin¹,

Datta²

2020

Preprint

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<p>Sensitive and selective detection of methane is essential due to its role in the greenhouse effect, relevance to industrial safety and recently discovered importance as a biomarker for gastrointestinal health. However, obtaining a reliable response to low concentrations (<100 ppm) of methane at low temperatures, especially in presence of humidity still remains a great challenge. In this work, a metal-oxide based sensor capable of low methane concentration detection and humidity resistance is reported. Chemiresistive sensors based on ZnO nanowire films were grown by a hydrothermal process and doped with Co. In terms of methane detection, Co-doping of the ZnO nanowires enabled the sensor to operate optimally at the low operating temperature of 50<sup>o</sup>C and an improved sensitivity of response (lowest measured concentration: 1 ppm) was observed when compared to that of pure ZnO nanowire films. This increased sensitivity was attributed to an increase in donor-type vacancies and enhanced oxygen adsorption on the surface. A mesoporous silica molecular sieve was further integrated as a moisture filter layer to mitigate the effect of humidity. It is envisaged that based on the sensors’ performance characteristics reported here, that the sensor could be applicable for emerging diagnostic applications tracking methane emissions from the breath. </p>

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Enhanced Carbon monoxide-sensing properties of Chromium-doped ZnO nanostructures

Cited by 59 publications

References 39 publications

Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Palladium-Doped Tin Oxide Nanosensor for the Detection of the Air Pollutant Carbon Monoxide Gas

Co-doped ZnO Nanowires for Low Temperature Methane Sensing Operational in Humid Environments

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