H2 sensor based on tapered optical fiber coated with MnO2 nanostructures

Antifouling biocides are toxic to the marine environment impacting negatively on the aquatic ecosystems. These biocides, namely, tributyltin (TBT) and Cu(I) compounds, are used to avoid biofouling; however, their toxicity turns TBT and Cu(I) monitoring an important health issue. Current monitoring methods are expensive and time-consuming. This review provides an overview of the actual state of the art of antifouling paints' biocides, including their impact and toxicity, as well as the reported methods for TBT and Cu(I) detection over the past decade. The principles of optical fiber sensors (OFS) applications, with focus on environmental applications, and the use of organic chemosensors in this type of sensors are debated. The multiplexing ability of OFS and their application on aquatic environments are also discussed.

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Section: Optical Fiber Sensorsmentioning

confidence: 99%

Optical Fiber Sensors for Biocide Monitoring: Examples, Transduction Materials, and Prospects

et al. 2020

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“…Several nanostructures of MnO 2 (including nanowires, nanograins, hierarchical hollow nanospheres, and nanorods) have been developed for the detection of triethylamine, hydrogen, ammonia, and ethanol. [36][37][38][39] Recently, some literature has demonstrated that the gas-sensing performance of MnO 2 was improved by applying heterostructure formation techniques. For example, ZnO nanoparticles combined with MnO 2 exhibited higher formaldehyde-sensing performance.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Selective Gas Sensors Based on NiO/MnO₂@NiO Nanosheets to Detect Allyl Mercaptan Gas Released by Humans under Psychological Stress

Choi

Masuda

2022

Advanced Science

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NiO nanosheets are synthesized in situ on gas sensor chips using a facile solvothermal method. These NiO nanosheets are then used as gas sensors to analyze allyl mercaptan (AM) gas, an exhaled biomarker of psychological stress. Additionally, MnO 2 nanosheets are synthesized onto the surfaces of the NiO nanosheets to enhance the gas-sensing performance. The gas-sensing response of the NiO nanosheet sensor is higher than that of the MnO 2 @NiO nanosheet sensor. The response value can reach 56.69, when the NiO nanosheet sensor detects 40 ppm AM gas. Interestingly, a faster response time (115 s) is obtained when the MnO 2 @NiO nanosheet sensor is exposed to 40 ppm of AM gas. Moreover, the selectivity toward AM gas is about 17-37 times greater than those toward confounders. The mechanism of gas sensing and the factors contributing to the enhance gas response of the NiO and MnO 2 @NiO nanosheets are discussed. The products of AM gas oxidized by the gas sensor are identified by gas chromatography-mass spectrometry (GC/MS). AM gas detection is an unprecedented application for semiconductor metal oxides. From a broader perspective, the developed sensors represent a new platform for the identification and monitoring of gases released by humans under psychological stress, which is increasing in modern life.

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“…Recently, various semiconductor materials have been reported to be coated on optical fiber to implement the VOCs gas sensors, and the sensing mechanism is based on the induced refractive index change caused by the reaction of semiconductor material and gas molecular. [ 13–18 ] Therefore, to improve the sensing performance, it is very important to control the growth of semiconductor materials on the optical fiber. However, the current methods mainly focus on dip‐coating semiconductor materials on the optical fiber, which commonly damage the original morphology features and fail to maximize material utilization.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive Exhaled Breath Sensors Based on Anti‐Resonant Hollow Core Fiber with In Situ Grown ZnO‐Bi₂O₃ Nanosheets

Liu

Zheng

Wang

et al. 2021

Adv Materials Inter

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Combination of anti‐resonant hollow‐core fiber (HCF) and semiconductor nanomaterial is an effective strategy to obtain high‐performance gas sensors with exceptional sensitivity and low power consumption. However, controlling the semiconductor morphology onto HCF is a major challenge to achieve the desired gas sensor with the enhanced sensitivity. Here, a ZnO‐Bi2O3 nanosheets (NSs) heterostructure is grown in situ on the surface of HCF by sol–gel and hydrothermal methods. ZnO‐Bi2O3 NSs serving as electron acceptors trap electrons after acetone adsorption and then change the refractive index of the surface of HCF. Benefiting from the unique sheet structure and the synergetic effects for multi‐component, the resulting ZnO‐Bi2O3 NSs enabled HCF gas sensor exhibits high sensitivity, selectivity, and repeatability for detecting acetone at room temperature, particularly in the low concentration range, with the theoretical limit of detection down to 140 parts‐per‐billion. Meanwhile, the successful application of the ZnO‐Bi2O3 NSs enabled HCF gas sensor to distinguish the exhaled breath from the healthy individuals and simulated diabetic cases is demonstrated, which paves the way to achieve non‐invasive, ultra‐sensitivity gas sensing at room temperature for the early diagnosis of diabetes.

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H2 sensor based on tapered optical fiber coated with MnO2 nanostructures

Cited by 31 publications

References 15 publications

Optical Fiber Sensors for Biocide Monitoring: Examples, Transduction Materials, and Prospects

Optical Fiber Sensors for Biocide Monitoring: Examples, Transduction Materials, and Prospects

Highly Sensitive and Selective Gas Sensors Based on NiO/MnO₂@NiO Nanosheets to Detect Allyl Mercaptan Gas Released by Humans under Psychological Stress

Ultrasensitive Exhaled Breath Sensors Based on Anti‐Resonant Hollow Core Fiber with In Situ Grown ZnO‐Bi₂O₃ Nanosheets

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H2 sensor based on tapered optical fiber coated with MnO2 nanostructures

Cited by 31 publications

References 15 publications

Optical Fiber Sensors for Biocide Monitoring: Examples, Transduction Materials, and Prospects

Optical Fiber Sensors for Biocide Monitoring: Examples, Transduction Materials, and Prospects

Highly Sensitive and Selective Gas Sensors Based on NiO/MnO2@NiO Nanosheets to Detect Allyl Mercaptan Gas Released by Humans under Psychological Stress

Ultrasensitive Exhaled Breath Sensors Based on Anti‐Resonant Hollow Core Fiber with In Situ Grown ZnO‐Bi2O3 Nanosheets

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Product

Resources

About

Highly Sensitive and Selective Gas Sensors Based on NiO/MnO₂@NiO Nanosheets to Detect Allyl Mercaptan Gas Released by Humans under Psychological Stress

Ultrasensitive Exhaled Breath Sensors Based on Anti‐Resonant Hollow Core Fiber with In Situ Grown ZnO‐Bi₂O₃ Nanosheets