Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films

Li, Hui; Li, Min; Kan, Hao; Li, Chong; Quan, Aojie; Fu, Chen; Luo, Jingting; Liu, Xueli; Wang, Wen; Yang, Zhengbao; Wei, Qiuping; Fu, Yong

doi:10.1016/j.surfcoat.2019.01.100

Cited by 45 publications

(20 citation statements)

References 31 publications

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“…In this case, SnS colloidal quantum dots (CQDs) were used as the sensing layer and fabricated on the ST-cut quartz substrate. 140 The sensor exhibited high selectivity and efficiency for the detection of NO 2 gas with low concentration at room temperature. Moreover, this is an efficient approach to diagnose diseases from exhaled breath by coating SAW sensors with various polymers to identify specic breath biomarkers.…”

Section: Saw Gas Sensorsmentioning

confidence: 97%

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Recent advances in 2D/nanostructured metal sulfide-based gas sensors: mechanisms, applications, and perspectives

et al. 2020

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Section: Saw Gas Sensorsmentioning

confidence: 97%

“…Last but not least, the SAW NO 2 sensor uses SnS CQDs as the sensing layer and is fabricated on a quartz substrate. 140 The sensor could detect a low concentration of NO 2 gas at room temperature with a good efficiency and selectivity (see Fig. 19 sensors could be at the ppm-level.…”

Section: Inorganic Gasesmentioning

confidence: 99%

Recent advances in 2D/nanostructured metal sulfide-based gas sensors: mechanisms, applications, and perspectives

et al. 2020

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“…SnS QD Gas Sensors SnS has low toxicity and low cost, with a direct and indirect bandgap of 1.0 eV and 1.3 eV, respectively. In this compound, Van der Waal's force is responsible for bonding Sn and S atoms [70]. The charge exchange between polar gases and SnS is favored because of the anisotropic crystal structure of SnS, making it a good candidate for sensing applications [71,72].…”

Section: Zns Qd Gas Sensormentioning

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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“…Gaseous pollutants can be either inorganic (e.g., CO, NO, NO 2 , SO 2 , and O 3 ) or organic (volatile organic compounds; VOCs) molecules, and their concentration in the atmosphere can vary from a few ppt to a few tens of ppm. Depending on their operating principle, gas sensors can be categorized as: acoustic wave sensors [13], quartz microbalances [14], calorimetric sensors (also referred to as anemometers or pellistors) [15], electrochemical cells [16], and field-effect transistors [17]. Other categories of sensors include those that probe changes of the optical properties (transmission and/or reflection) [18] of the sensing material caused by absorption of the target gas molecules, or of the electrical properties (resistance, conductance, capacitance, and impedance) of the gas sensing material as a result of the adsorption of gas molecules onto their surface.…”

Section: Introductionmentioning

confidence: 99%

Metal oxide semiconducting nanomaterials for air quality gas sensors: operating principles, performance, and synthesis techniques

2022

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To meet requirements in air quality monitoring, sensors are required that can measure the concentration of gaseous pollutants at concentrations down to the ppb and ppt levels, while at the same time they exhibiting high sensitivity, selectivity, and short response/recovery times. Among the different sensor types, those employing metal oxide semiconductors (MOSs) offer great promises as they can be manufactured in easy/inexpensive ways, and designed to measure the concentration of a wide range of target gases. MOS sensors rely on the adsorption of target gas molecules on the surface of the sensing material and the consequent capturing of electrons from the conduction band that in turn affects their conductivity. Despite their simplicity and ease of manufacturing, MOS gas sensors are restricted by high limits of detection (LOD; which are typically in the ppm range) as well as poor sensitivity and selectivity. LOD and sensitivity can in principle be addressed by nanostructuring the MOSs, thereby increasing their porosity and surface-to-volume ratio, whereas selectivity can be tailored through their chemical composition. In this paper we provide a critical review of the available techniques for nanostructuring MOSs using chemiresistive materials, and discuss how these can be used to attribute desired properties to the end gas sensors. We start by describing the operating principles of chemiresistive sensors, and key material properties that define their performance. The main part of the paper focuses on the available methods for synthesizing nanostructured MOSs for use in gas sensors. We close by addressing the current needs and provide perspectives for improving sensor performance in ways that can fulfill requirements for air quality monitoring. Graphical abstract

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Surface acoustic wave NO2 sensors utilizing colloidal SnS quantum dot thin films

Cited by 45 publications

References 31 publications

Recent advances in 2D/nanostructured metal sulfide-based gas sensors: mechanisms, applications, and perspectives

Recent advances in 2D/nanostructured metal sulfide-based gas sensors: mechanisms, applications, and perspectives

Resistive-Based Gas Sensors Using Quantum Dots: A Review

Metal oxide semiconducting nanomaterials for air quality gas sensors: operating principles, performance, and synthesis techniques

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