Studies on self supported film of PMMA, PMMA-PVA and PMMA-(PVAAg) nano composite for highly linear response over wide range of humidity

Mahapure, Poonam D.; Aiyer, R. C.; Gosavi, Suresh; Adhyapaka, P.V.; Amalnerkara, D. P.

doi:10.1109/ispts.2012.6260936

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…A variety of materials can be used for deposition on flexible substrates [3][4][5][6] but the ones that stands out due to easy deposition in the form of thin films, relatively low cost, tailored functionality and fast response are polymers [7]. A number of different polymers, suitable for use as flexible substrates for sensor applications, are reported in the literature, including polyethylene naphthalate (PEN) [8,9], polyethylene terephthalate (PET) [10][11][12][13][14], polydimethylsiloxane PDMS [15,16], polyimide PI [17][18][19][20], polyvinyl alcohol (PVA) [21][22][23][24], polylactide (PLA) [25,26], polyurethane (PU) [27,28], polysulfone (PSU) [29], polyetheretherketone (PEEK) [30,31] and polycarbonate (PC) [32], along with other materials such as common paper [33,34], flexible glass [35] and last, but not least, composite [36] and multilayer substrates [37]. Among the most commonly used flexible substrates, PI provides a great solution for devices with higher annealing temperatures; however, its amber color makes it unsuitable for devices that require transparency.…”

Section: Introductionmentioning

confidence: 99%

Flexible and Transparent Polymer-Based Optical Humidity Sensor

Lazarova

Bozhilova

Ivanova

et al. 2021

Sensors

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Thin spin-coated polymer films of amphiphilic copolymer obtained by partial acetalization of poly (vinyl alcohol) are used as humidity-sensitive media. They are deposited on polymer substrate (PET) in order to obtain a flexible humidity sensor. Pre-metallization of substrate is implemented for increasing the optical contrast of the sensor, thus improving the sensitivity. The morphology of the sensors is studied by surface profiling, while the transparency of the sensor is controlled by transmittance measurements. The sensing behavior is evaluated through monitoring of transmittance values at different levels of relative humidity gradually changing in the range 5–95% and the influence of up to 1000 bending deformations is estimated by determining the hysteresis and sensitivity of the flexible sensor after each set of deformations. The successful development of a flexible sensor for optical monitoring of humidity in a wide humidity range is demonstrated and discussed.

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Section: Introductionmentioning

confidence: 99%

Flexible and Transparent Polymer-Based Optical Humidity Sensor

Lazarova

Bozhilova

Ivanova

et al. 2021

Sensors

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“…In an attempt to continue the development in the field and to expand the range of polymer structures studied for optical sensing application, poly(vinyl alcohol) (PVA) was selected as a hydroxyl-functionalized building block based on its valuable physico-mechanical and film-forming properties. In the literature, a number of papers report on the application of PVA-based composite films as active media for humidity sensing [9][10][11][12], but to the best of our knowledge PVA copolymers were not tested in optical sensors. We have already shown that films of poly(vinyl alcohol-co-vinyl acetal)s of varied copolymer compositions annealed at 60 °C can be used as active media for optical sensing of humidity [13].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Annealing on Optical and Humidity Sensing Properties of Poly(Vinyl Alcohol-Co-Vinyl Acetal) Thin Films

Lazarova

Bozhilova

Ivanova

et al. 2019

The 6th International Electronic Conference on Sensors and Applications

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Hydrophobically modified poly(vinyl alcohol)s of varied copolymer composition were tested as active media for optical sensing of humidity. Copolymer thin films were deposited on silicon substrate using water-methanol solution in a volume ratio of 20:80 and concentration of 1 wt%. Films were subjected to low (60 °C) and moderate (180 °C) temperature annealing in order to study the temperature influence on optical and humidity sensing properties. Refractive index, extinction coefficient along with thickness of the films were determined by non-linear minimization of the goal function comprising measured and calculated reflectance spectra at normal light incidence. The humidity sensing ability of the films was studied through reflectance measurements at different humidity levels in the range 5–95 %RH. The influence of temperature annealing on optical and sensing properties was demonstrated and discussed.

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Studies on self supported film of PMMA, PMMA-PVA and PMMA-(PVAAg) nano composite for highly linear response over wide range of humidity

Cited by 2 publications

References 27 publications

Flexible and Transparent Polymer-Based Optical Humidity Sensor

Flexible and Transparent Polymer-Based Optical Humidity Sensor

The Influence of Annealing on Optical and Humidity Sensing Properties of Poly(Vinyl Alcohol-Co-Vinyl Acetal) Thin Films

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