Capacitive gas and vapor sensors using nanomaterials

Bindra, Prateek; Hazra, Arnab

doi:10.1007/s10854-018-8606-2

Cited by 34 publications

(21 citation statements)

References 101 publications

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“…When the device is exposed to a humid environment, the water molecules will quickly occupy the available sites. The dissociative adsorption of the water releases electrons and protons to strong the piezo-screening effect, leading to the lower outputting piezoelectric voltage [46][47][48]. When the relative humidity is 50%, 60%, 70%, 80%, 90%, and 100% (pure water), the response of the device is 0%, 6%, 17.3%, 24.6%, 29.2%, and 33.3%, respectively.…”

Section: Resultsmentioning

confidence: 99%

A Self-Powered Biosensor for Monitoring Maximal Lactate Steady State in Sport Training

et al. 2020

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A self-powered biosensor for monitoring the maximal lactate steady state (MLSS) during exercise has been developed for intelligently assisting training system. It has been presented to create poly (vinylidene fluoride) (PVDF)/Tetrapod-shaped ZnO (T-ZnO)/enzyme-modified nanocomposite film through an efficient and cost-effective fabrication process. This sensor can be readily attached to the skin surface of the tester. Due to the piezoelectric surface coupling effect, this biosensor can monitor/sense and analyze physical information in real-time under the non-invasive condition and work independently without any battery. By actively outputting piezoelectric signals, it can quickly and sensitively detect body movements (changes of joint angle, frequency relative humidity during exercise) and physiological information (changes of lactate concentration in sweat). A practical application has been demonstrated by an excellent professional speed skater (male). The purpose of this study is to increase the efficiency of MLSS evaluation, promote the development of piezoelectric surface coupling effect and motion monitoring application, develop an intelligently assisting training system, which has opened up a new direction for human motion monitoring.

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Section: Resultsmentioning

confidence: 99%

A Self-Powered Biosensor for Monitoring Maximal Lactate Steady State in Sport Training

et al. 2020

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“…In order to be considered a suitable device, the sensor should have a fast response to external stimulus, be able to detect an analyte in proportion as low as possible, have low recovery time, identify the right analyte among others, and be an easy-to-operate system. Furthermore, a low-cost and environmentally friendly characteristic is desirable [24]. us, there is a necessity to improve systems that have been already used and find new promising alternatives that allow changing old technologies.…”

Section: Sensing Propertiesmentioning

confidence: 99%

Carbon Nanostructure-based Sensors: A Brief Review on Recent Advances

Bezzon

Montanheiro

Menezes

et al. 2019

Advances in Materials Science and Engineering

122

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A brief review reporting the recent advances on the carbon nanostructured materials-based sensors covering recently published works is presented. Several works dealing with experimental and theoretical data are reviewed and discussed. The main results for carbon nanotubes, nanodiamonds, fullerene, graphene, and hybrid carbon-nanostructured devices that show sensing properties in different fields were considered for the discussions. The goal of this paper was to highlight sensor mechanisms, and the best results reached up to now are creating bases for further applications.

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“…However, continuous efforts are devoted to the development of compact and low-impact sensors for volatile chemical species with improved sensitivity, specificity, accuracy, response, and recovery times [7]. To this end, a plethora of transduction phenomena (chemiresistive, capacitive, mass-sensitive, calorimetric, and optical) were investigated to propose various technological solutions for the analysis of complex matrices [8][9][10][11][12][13]. From the analytical point of view, different models were developed to propose a relationship among the number of adsorbed/desorbed molecules, their interactions, and the sensor response, such as the Langmuir and Wolkenstein's models [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

An Affordable Fabrication of a Zeolite-Based Capacitor for Gas Sensing

Pullano

Falcone

Critello

et al. 2020

Sensors

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The development of even more compact, inexpensive, and highly sensitive gas sensors is widespread, even though their performances are still limited and technological improvements are in continuous evolution. Zeolite is a class of material which has received particular attention in different applications due to its interesting adsorption/desorption capabilities. The behavior of a zeolite 4A modified capacitor has been investigated for the adsorption of nitrogen (N2), nitric oxide (NO) and 1,1-Difluoroethane (C2H4F2), which are of interest in the field of chemical, biological, radiological, and nuclear threats. Sample measurements were carried out in different environmental conditions, and the variation of the sensor electric capacitance was investigated. The dielectric properties were influenced by the type and concentration of gas species in the environment. Higher changes in capacitance were shown during the adsorption of dry air (+4.2%) and fluorinated gas (+7.3%), while lower dielectric variations were found upon exposure to N2 (−0.4%) and NO (−0.5%). The proposed approach pointed-out that a simple fabrication process may provide a convenient and affordable fabrication of reusable capacitive gas sensor.

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Capacitive gas and vapor sensors using nanomaterials

Cited by 34 publications

References 101 publications

A Self-Powered Biosensor for Monitoring Maximal Lactate Steady State in Sport Training

A Self-Powered Biosensor for Monitoring Maximal Lactate Steady State in Sport Training

Carbon Nanostructure-based Sensors: A Brief Review on Recent Advances

An Affordable Fabrication of a Zeolite-Based Capacitor for Gas Sensing

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