Thin films from hydrophilic poly(N,N-dimethyl acrylamide) copolymers as optical indicators for humidity

Lazarova, Katerina; Todorova, Lyudmila; Christova, Darinka; Vasileva, Marina; Georgiev, Rosen; Madjarova, Violeta; Babeva, Tsvetanka

doi:10.1088/1742-6596/794/1/012022

Cited by 2 publications

(5 citation statements)

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“…In our previous study, we have shown that the postdeposition annealing at a temperature of 180 °C maximizes the sensitivity of PDMA- b -PEO- b -PDMA thin films [23]. At this temperature, the change in the film’s refractive index and thickness when humidity changes from 5 to 95% RH is the strongest [23]. These results are obtained with films with thicknesses of 80 nm.…”

Section: Resultsmentioning

confidence: 82%

“…The next step of our investigation concerns star-shaped PDMA polymer (P2). In our previous study, when comparing the humidity changes of PDMA thin films to those of corresponding PDMA-PEO di- and triblock copolymers, we have obtained the strongest changes in refractive index and thickness for PDMA homopolymer thin films [23]. Considering this together with the star-shaped macromolecular structure of P2, an enhancement of sensing properties for P2 films could be expected.…”

Section: Resultsmentioning

confidence: 86%

“…In order to study the influence of the different macromolecular architecture of the polymers on their optical and humidity-sensing properties, thin polymer films are deposited by the method of spin coating and films’ properties are investigated. In our previous study, we have shown that the postdeposition annealing at a temperature of 180 °C maximizes the sensitivity of PDMA- b -PEO- b -PDMA thin films [23]. At this temperature, the change in the film’s refractive index and thickness when humidity changes from 5 to 95% RH is the strongest [23].…”

Section: Resultsmentioning

confidence: 99%

“…In our previous studies, we have demonstrated the humidity-sensing ability of thin films from poly( N , N -dimethyl acrylamide)-poly(ethylene oxide) (PDMA-PEO) di- and triblock copolymers deposited by spin coating on silicon substrates [23] or on top of a Bragg stack consisting of alternating layers of SiO 2 and Nb 2 O 5 [24]. Two detection methods were explored: Measuring reflectance for single films and transmittance for the stack, and visual inspection of color in both cases [23,24]. It was shown [23,24] that the optical response to humidity of the investigated copolymer films is little influenced by copolymer composition or structure (two- or tri-component; diblock or triblock).…”

Section: Introductionmentioning

confidence: 99%

“…Two detection methods were explored: Measuring reflectance for single films and transmittance for the stack, and visual inspection of color in both cases [23,24]. It was shown [23,24] that the optical response to humidity of the investigated copolymer films is little influenced by copolymer composition or structure (two- or tri-component; diblock or triblock). All studied copolymers exhibited high sensitivity toward humidity change from low to high levels.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Macromolecular Architecture on the Optical and Humidity-Sensing Properties of Poly(N,N-Dimethylacrylamide)-Based Block Copolymers

et al. 2018

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Abstract:The influence of the macromolecular architecture of block copolymers containing poly(N,N-dimethyl acrylamide) (PDMA) on the optical characteristics and sensing properties of corresponding thin films is discussed. Series of hydrophilic PDMA-based copolymers of different chemical composition and chain architecture such as triblock, star-shaped, and branched were synthesized. The copolymers were characterized using conventional spectroscopic techniques as well as methods for characterization of copolymer macromolecular characteristics in solution, namely size-exclusion chromatography and static light scattering. Thin films of the copolymers of nanometer scale thickness were deposited on silicon substrates by the spin-coating method. The refractive index and extinction coefficient of the copolymer films were calculated from the reflectance spectra by using non-linear curve fitting methods and the composition-structure-optical properties relationships were evaluated. Humidity-sensing properties of the films were studied by measuring reflectance spectra of the films at a relative humidity range from 5 to 95%RH. The implementation of the copolymer films as optical sensors of humidity is justified and discussed.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 86%