Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

This paper presents an overview of semiconductor materials used in gas sensors, their technology, design, and application. Semiconductor materials include metal oxides, conducting polymers, carbon nanotubes, and 2D materials. Metal oxides are most often the first choice due to their ease of fabrication, low cost, high sensitivity, and stability. Some of their disadvantages are low selectivity and high operating temperature. Conducting polymers have the advantage of a low operating temperature and can detect many organic vapors. They are flexible but affected by humidity. Carbon nanotubes are chemically and mechanically stable and are sensitive towards NO and NH3, but need dopants or modifications to sense other gases. Graphene, transition metal chalcogenides, boron nitride, transition metal carbides/nitrides, metal organic frameworks, and metal oxide nanosheets as 2D materials represent gas-sensing materials of the future, especially in medical devices, such as breath sensing. This overview covers the most used semiconducting materials in gas sensing, their synthesis methods and morphology, especially oxide nanostructures, heterostructures, and 2D materials, as well as sensor technology and design, application in advance electronic circuits and systems, and research challenges from the perspective of emerging technologies.

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“… Scheme showing semiconductor gas-sensor applications, adapted from [ 170 , 171 , 172 , 173 , 174 , 175 , 176 , 177 , 178 ]. …”

Section: Figurementioning

confidence: 99%

Semiconductor Gas Sensors: Materials, Technology, Design, and Application

Nikolić

Milovanović

Vasiljević

et al. 2020

Sensors

303

134

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“…However, there are few researches related to use of carbon QDs as resistive-based gas sensors. For example, carbon QD/ZnO composite was used as an NO gas sensor [132]. At 100 • C, it revealed a high response of 238 to 10 ppm NO gas, which was more than 100 times of that for the pristine ZnO microsphere gas sensor.…”

Section: Resistive-based Gas Sensors On Composite Qdsmentioning

confidence: 99%

Resistive-Based Gas Sensors Using Quantum Dots: A Review

Mirzaei

Kordrostami

Shahbaz

et al. 2022

Sensors

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Quantum dots (QDs) are used progressively in sensing areas because of their special electrical properties due to their extremely small size. This paper discusses the gas sensing features of QD-based resistive sensors. Different types of pristine, doped, composite, and noble metal decorated QDs are discussed. In particular, the review focus primarily on the sensing mechanisms suggested for these gas sensors. QDs show a high sensing performance at generally low temperatures owing to their extremely small sizes, making them promising materials for the realization of reliable and high-output gas-sensing devices.

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“…Consequently, the response value is seriously influenced by the surface state of the sensitive material. Research on sensitive materials has gradually developed from irregular powder materials in the beginning to micro-nano materials at the present stage, such as various 0-dimensional (nanoparticles [33,34], quantum dots [35]), 1-dimensional (nanowires [36], nanofibers), 2-dimensional (nanosheets [37]) and 3-dimensional (flower-like [38,39], spherical [40]) nanostructured materials. Due to the unique properties of its nanometer size, nanomaterials have a sharp edge in the field of gas sensing.…”

Section: Control the Microstructure And Morphology Of Sensitive Materialsmentioning

confidence: 99%

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

2021

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Formaldehyde is a poisonous and harmful gas, which is ubiquitous in our daily life. Long-term exposure to formaldehyde harms human body functions; therefore, it is urgent to fabricate sensors for the real-time monitoring of formaldehyde concentrations. Metal oxide semiconductor (MOS) gas sensors is favored by researchers as a result of their low cost, simple operation and portability. In this paper, the mechanism of formaldehyde detection by gas sensors is introduced, and then the ways of ameliorating the response of gas sensors for formaldehyde detection in recent years are summarized. These methods include the control of the microstructure and morphology of sensing materials, the doping modification of matrix materials, the development of new semiconductor sensing materials, the outfield control strategy and the construction of the filter membrane. These five methods will provide a good prerequisite for the preparation of better performing formaldehyde gas sensors.

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Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

Cited by 47 publications

References 38 publications

Semiconductor Gas Sensors: Materials, Technology, Design, and Application

Semiconductor Gas Sensors: Materials, Technology, Design, and Application

Resistive-Based Gas Sensors Using Quantum Dots: A Review

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

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