Rapid detection of low concentrations of H2S using CuO-doped ZnO nanofibers

Hsu, Kuo-Chin; Fang, Te‐Hua; Hsiao, Yu‐Jen; Li, Zong-Jin

doi:10.1016/j.jallcom.2020.157014

Cited by 66 publications

(29 citation statements)

References 38 publications

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“…Sensors with turn-off behavior exhibit decreasing fluorescence intensity (fluorescence quenching) with increasing analyte concentration (Figure E(i)). In sensors with turn-on behavior, the analyte increases the fluorescence intensity as a function of analyte concentration (Figure E(ii)). − The most important functional materials for optical sensing include organic and synthetic dyes, conjugated polymers, noble metal and metal oxide nanostructures, and quantum dots . Since the pH shifts from low to high with the increase of TVB-N, synthetic dyes and naturally occurring compounds with the ability to change their colors with pH can be applied as spoilage indicators.…”

Section: Amine Gas Sensors: Materials and Mechanismsmentioning

confidence: 99%

Recent Progress in Amine Gas Sensors for Food Quality Monitoring: Novel Architectures for Sensing Materials and Systems

et al. 2022

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The increasing demand for food production has necessitated the development of sensitive and reliable methods of analysis, which allow for the optimization of storage and distribution while ensuring food safety. Methods to quantify and monitor volatile and biogenic amines are key to minimizing the waste of high-protein foods and to enable the safe consumption of fresh products. Novel materials and device designs have allowed the development of portable and reliable sensors that make use of different transduction methods for amine detection and food quality monitoring. Herein, we review the past decade’s advances in volatile amine sensors for food quality monitoring. First, the role of volatile and biogenic amines as a food-quality index is presented. Moreover, a comprehensive overview of the distinct amine gas sensors is provided according to the transduction method, operation strategies, and distinct materials (e.g., metal oxide semiconductors, conjugated polymers, carbon nanotubes, graphene and its derivatives, transition metal dichalcogenides, metal organic frameworks, MXenes, quantum dots, and dyes, among others) employed in each case. These include chemoresistive, fluorometric, colorimetric, and microgravimetric sensors. Emphasis is also given to sensor arrays that record the food quality fingerprints and wireless devices that operate as radiofrequency identification (RFID) tags. Finally, challenges and future opportunities on the development of new amine sensors are presented aiming to encourage further research and technological development of reliable, integrated, and remotely accessible devices for food-quality monitoring.

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Section: Amine Gas Sensors: Materials and Mechanismsmentioning

confidence: 99%

Recent Progress in Amine Gas Sensors for Food Quality Monitoring: Novel Architectures for Sensing Materials and Systems

et al. 2022

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“…Moreover, because H 2 S is heavier than air, it remains in the atmosphere for up to 18 h; thus, it can easily accumulate in areas such as mine tunnels, sewers, and manure tanks [9,10]. As stated by the United States Occupational Safety and Health Administration (US-OSHA, Washington, DC, USA), the concentration limit for exposure to H 2 S within 8 h is approximately 20 ppm [11]. Exposure to low levels of H 2 S may result in eye and throat injuries, dizziness, memory impairment, and loss of reasoning and balance [12][13][14][15].…”

Section: Overview Of H 2 S Gas Propertiesmentioning

confidence: 99%

CuxO Nanostructure-Based Gas Sensors for H2S Detection: An Overview

et al. 2021

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H2S gas is a toxic and hazardous byproduct of the oil and gas industries. It paralyzes the olfactory nerves, with concentrations above 100 ppm, resulting in loss of smell; prolonged inhalation may even cause death. One of the most important semiconducting metal oxides for the detection of H2S is CuxO (x = 1, 2), which is converted to CuxS upon exposure to H2S, leading to a remarkable modulation in the resistance and appearance of an electrical sensing signal. In this review, various morphologies of CuxO in the pristine form, composites of CuxO with other materials, and decoration/doping of noble metals on CuxO nanostructures for the reliable detection of H2S gas are thoroughly discussed. With an emphasis to the detection mechanism of CuxO-based gas sensors, this review presents findings that are of considerable value as a reference.

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“…ZnO is one of the first ceramic oxide NFs that is fabricated using the electrospinning process. Among many electrospun metal oxide NFs, ZnO NFs are widely used for sensing various gases such as ammonia, [12] nitrogen dioxide, [13,14] methane, [15] acetone, [16] hydrogen, [17] hydrogen sulfide, [18] carbon dioxide, [19] ethanol, [20] and carbon monoxide. [21,22] The ZnO is advantageous over the other metal oxides for gas sensing due to its n-type semiconducting nature with a bandgap of 3.37 eV.…”

Section: Introductionmentioning

confidence: 99%

Electrospun ZnO Nanofiber Based Resistive Gas/Vapor Sensors -A Review

Prabhu¹,

Chandra²,

Rajendra³

et al. 2022

Eng. Sci.

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Resistive zinc oxide (ZnO) sensors play a pivotal role in detecting various gases and vapors due to their high response, low cost, stability, tunability, and simple fabrication. Hence, it is necessary to know the recent status of research in resistive ZnO sensors. The sensitivity is determined by the reactions at the surface of the nanofiber (NF); therefore, the surface area defines the foremost sensor characteristics. Electrospun metal oxide NFs exhibit a high surface area and unique electrical properties that can be tuned, and they are highly sought as the materials for resistive gas sensors. So far, various strategies are adopted to improve the sensitivity and the selectivity of ZnO NFs. This review summarizes the recent methods utilized by various researchers to improve the sensitivity of the ZnO electrospun metal oxide NF-based resistive gas sensors. Also, it discusses the influence of process parameters on the structure and morphology of ZnO NFs, the mechanism of gas sensing and highlights its improvement through advanced methods. The sensitivity of the NF has been improved through tuning the structure and morphology of NFs and doping. Further, modification of NF sensitivity through functionalization, the addition of carbon nanomaterials, and high-energy irradiation are also discussed. Based on the recent literature, the performance of doped ZnO NF for various gas sensing is highlighted. The outcome of this review gives insight to academic researchers and industry for further investigation and development in resistive gas sensors and its applications.

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Rapid detection of low concentrations of H2S using CuO-doped ZnO nanofibers

Cited by 66 publications

References 38 publications

Recent Progress in Amine Gas Sensors for Food Quality Monitoring: Novel Architectures for Sensing Materials and Systems

Recent Progress in Amine Gas Sensors for Food Quality Monitoring: Novel Architectures for Sensing Materials and Systems

CuxO Nanostructure-Based Gas Sensors for H2S Detection: An Overview

Electrospun ZnO Nanofiber Based Resistive Gas/Vapor Sensors -A Review

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