Novel temperature-activated humidity-sensitive optical sensor

Mills, Andrew; Hawthorne, D.; Burns, Luke; Hazafy, David

doi:10.1016/j.snb.2016.08.182

Cited by 29 publications

(19 citation statements)

References 16 publications

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“…Preliminary tests were performed to evaluate the sensor response as a function of humidity. When the relative humidity was varied between 2% and 77%, a significant decrease in absorbance was observed at these two wavelengths (Figure 3A), in agreement with previous reports [46]. On the contrary, the absorbance increased at 560 nm and at wavelengths higher than 700 nm.…”

Section: Resultssupporting

confidence: 92%

Real-Time Ozone Sensor Based on Selective Oxidation of Methylene Blue in Mesoporous Silica Films

Ghazaly

Hébrant

Langlois

et al. 2019

Sensors

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Sensitive and selective personal exposure monitors are needed to assess ozone (O3) concentrations in the workplace atmosphere in real time for the analysis and prevention of health risks. Here, a cumulative gas sensor using visible spectroscopy for real-time O3 determination is described. The sensing chip is a mesoporous silica thin film deposited on transparent glass and impregnated with methylene blue (MB). The sensor is reproducible, stable for at least 50 days, sensitive to 10 ppb O3 (one-tenth of the occupational exposure limit value in France, Swiss, Canada, U.K., Japan, and the USA) with a measurement range tested up to 500 ppb, and insensitive to NO2 and to large variation in relative humidity. A model and its derivative as a function of time are proposed to convert in real time the sensor response to concentrations, and an excellent correlation was obtained between those data and reference O3 concentrations. This sensor is based on a relatively cheap sensing material and a robust detection system, and its analytical performance makes it suitable for monitoring real-time O3 concentrations in workplaces to promote a safer environment for workers.

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Section: Resultssupporting

confidence: 92%

Real-Time Ozone Sensor Based on Selective Oxidation of Methylene Blue in Mesoporous Silica Films

Ghazaly

Hébrant

Langlois

et al. 2019

Sensors

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“…Mills at el. developed temperature-activated humidity sensor based on hydroxypropylmethyl cellulose and thiazine dyes [64]. This sensor has ability to change its color within seconds at relative humidity lower than 70%, which makes it suitable in food packaging of dry food.…”

Section: Cellulosementioning

confidence: 99%

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Nešić

Cabrera‐Barjas

Dimitrijević-Branković

et al. 2019

Molecules

208

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The use of polysaccharide-based materials presents an eco-friendly technological solution, by reducing dependence on fossil resources while reducing a product's carbon footprint, when compared to conventional plastic packaging materials. This review discusses the potential of polysaccharides as a raw material to produce multifunctional materials for food packaging applications. The covered areas include the recent innovations and properties of the polysaccharide-based materials. Emphasis is given to hemicelluloses, marine polysaccharides, and bacterial exopolysaccharides and their potential application in the latest trends of food packaging materials, including edible coatings, intelligent films, and thermo-insulated aerogel packaging.

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“…Some qualitative colourful sensors were also produced with outstanding visibility, brightness and simplicity of production [ 31 ]. In spite of their advantages, reversibility of humidity indication requires high temperature treatment, so their applicability is limited.…”

Section: Introductionmentioning

confidence: 99%

Holographic sol–gel monoliths: optical properties and application for humidity sensing

et al. 2018

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Sol–gel monoliths based on SiO2, TiO2 and ZrO2 with holographic colourful diffraction on their surfaces were obtained via a sol–gel synthesis and soft lithography combined method. The production was carried out without any additional equipment at near room temperature and atmospheric pressure. The accurately replicated wavy structure with nanoscale size of material particles yields holographic effect and its visibility strongly depends on refractive index (RI) of materials. Addition of multi-walled carbon nanotubes (MWCNTs) in systems increases their RI and lends absorbing properties due to extremely high light absorption constant. Further prospective and intriguing applications based on the most successful samples, MWCNTs-doped titania, were investigated as reversible optical humidity sensor. Owing to such property as reversible resuspension of TiO2 nanoparticles while interacting with water, it was proved that holographic xerogels can repeatedly act as humidity sensors. Materials which can be applied as humidity sensors in dependence on holographic response were discovered for the first time.

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Novel temperature-activated humidity-sensitive optical sensor

Cited by 29 publications

References 16 publications

Real-Time Ozone Sensor Based on Selective Oxidation of Methylene Blue in Mesoporous Silica Films

Real-Time Ozone Sensor Based on Selective Oxidation of Methylene Blue in Mesoporous Silica Films

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Holographic sol–gel monoliths: optical properties and application for humidity sensing

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