FexZn1-xOy as room temperature dual sensor for formaldehyde and ammonia gas detection

Recently the emissions of volatile organic compounds (VOCs) in the atmosphere have increased dramatically with rapid development of urbanization and industry. This led to a large decline in air quality around the world, which resulted in a heavy impact on human health. Therefore, new/cheap detection devices for VOCs are of high interest. Formaldehyde (FA) is a very toxic VOC, which damages the respiratory system even in the smallest doses and short exposure time. Zinc oxide (ZnO)/nickel oxide (NiO) heterostructures were synthesized using an economical route: firstly, NiO was prepared by liquid exfoliation technique and deposited by dip-coating on alumina ceramic transducers with two interdigital gold (Au) electrodes, followed by low—temperature hydrothermal growth of ZnO. The as-prepared sensors were characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM-EDAX), and X-Ray fluorescence (XRF). The response/recovery of ZnO/NiO heterostructure-based microsensors for formaldehyde was investigated at room temperature, in agreement with modern sensing requirements. The sensor operating voltage was varied between 1.5 and 5.0 V direct current (DC), to achieve the best sensor performance.

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“…This mechanism was consistent with data found in literature, regarding formaldehyde oxidation at low temperatures [ 45 , 46 ].…”

Section: Resultssupporting

confidence: 93%

ZnO/NiO heterostructure-based microsensors used in formaldehyde detection at room temperature: Influence of the sensor operating voltage

Chelu

Chesler

Anastasescu

et al. 2022

J Mater Sci: Mater Electron

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“…Metal-oxide semiconductors (MOS) have been widely investigated for gas sensing due to their exceptional specific surface area, facile synthesis, and high response to toxic gases [65][66][67][68]. However, MOS gas detectors have drawbacks such as cross-selectivity, low selectivity, and high working temperature [38,41,[69][70][71].…”

Section: Mxene/metal-oxide Heterostructuresmentioning

confidence: 99%

Gas-Sensing Mechanisms and Performances of MXenes and MXene-Based Heterostructures

John,

Vijayan,

Septiani

et al. 2023

Sensors

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MXenes are a class of 2D transition-metal carbides, nitrides, and carbonitrides with exceptional properties, including substantial electrical and thermal conductivities, outstanding mechanical strength, and a considerable surface area, rendering them an appealing choice for gas sensors. This manuscript provides a comprehensive analysis of heterostructures based on MXenes employed in gas-sensing applications and focuses on addressing the limited understanding of the sensor mechanisms of MXene-based heterostructures while highlighting their potential to enhance gas-sensing performance. The manuscript begins with a broad overview of gas-sensing mechanisms in both pristine materials and MXene-based heterostructures. Subsequently, it explores various features of MXene-based heterostructures, including their composites with other materials and their prospects for gas-sensing applications. Additionally, the manuscript evaluates different engineering strategies for MXenes and compares their advantages to other materials while discussing the limitations of current state-of-the-art sensors. Ultimately, this review seeks to foster collaboration and knowledge exchange within the field, facilitating the development of high-performance gas sensors based on MXenes.

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“…Among noble-metal sensitization [16], morphological control [17], metallic impurity doping [18], heterostructure construction [12], and other referential methods, doping metallic impurities is deemed as a feasible means to enhance gas sensing features [19]. Specifically, doping with Fe 3+ in SMOX can boost the optical band-gap width and conductivity, meanwhile modifying electronic structures and surface chemical states of materials [20], thereby strengthening VOC sensing applications of SMOX [21].…”

Section: Introduction mentioning

confidence: 99%

Ultrasensitive room-temperature geranyl acetone detection based on Fe@WO _{3−
x} nanoparticles in cooked rice flavor analysis

Zheng¹,

Liu²,

Zhou³

et al. 2023

Journal of Advanced Ceramics

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In the assessment of food quality, geranyl acetone plays a crucial role as a volatile organic compound (VOC) biomarker for diverse agricultural products, while the ultralow concentration detection meeting application requirements has been barely studied. Herein, an iron (Fe)-doped WO 3−x gas sensor was employed for greatly sensitive, selective, and scalable geranyl acetone detection. The results proved that precisely-regulated oxygen vacancy (O V ) and sophisticatedly-active electron transition of Fe-doped WO 3−x nanoparticles were fulfilled by modifying the doping amount of Fe 3+ , leading to the prominently enhanced sensitivity (23.47 at 6 ppm), low limit of detection (LOD) (237 ppb), optimal selectivity, and outstanding long-term stability. Furthermore, the enhancing mechanism of gas sensing performance was substantiated through density functional theory (DFT) calculation, while the practical application for the evaluation of spoiled cooked rice was conducted as well. This study demonstrates a reliable method for detecting a VOC biomarker in cooked rice, which can ensure food security and improve palatability of cooked rice.

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FexZn1-xOy as room temperature dual sensor for formaldehyde and ammonia gas detection

Cited by 11 publications

References 42 publications

ZnO/NiO heterostructure-based microsensors used in formaldehyde detection at room temperature: Influence of the sensor operating voltage

ZnO/NiO heterostructure-based microsensors used in formaldehyde detection at room temperature: Influence of the sensor operating voltage

Gas-Sensing Mechanisms and Performances of MXenes and MXene-Based Heterostructures

Ultrasensitive room-temperature geranyl acetone detection based on Fe@WO _{3−
x} nanoparticles in cooked rice flavor analysis

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FexZn1-xOy as room temperature dual sensor for formaldehyde and ammonia gas detection

Cited by 11 publications

References 42 publications

ZnO/NiO heterostructure-based microsensors used in formaldehyde detection at room temperature: Influence of the sensor operating voltage

ZnO/NiO heterostructure-based microsensors used in formaldehyde detection at room temperature: Influence of the sensor operating voltage

Gas-Sensing Mechanisms and Performances of MXenes and MXene-Based Heterostructures

Ultrasensitive room-temperature geranyl acetone detection based on Fe@WO 3− x nanoparticles in cooked rice flavor analysis

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Product

Resources

About

Ultrasensitive room-temperature geranyl acetone detection based on Fe@WO _{3−
x} nanoparticles in cooked rice flavor analysis