Polymeric humidity sensor based on laser carbonized polyimide substrate

Ingram, John; Greb, Matthew; Nicholson, James; Fountain, Augustus W.

doi:10.1016/s0925-4005(03)00544-6

Cited by 24 publications

(10 citation statements)

References 26 publications

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“…Therefore the change of the dielectric constant of the hygroscopic polymer is linearly proportional to the amount of water absorbed. To be non-ionic but very polar, polyimides, [144][145][146][147][148][149] and esters are apparently good candidates, such as cellulose acetate butyrate (CAB), [150][151][152] poly(methyl methacrylate) (PMMA), 153 154 poly(vinyl crotonate), 121 and poly(ethyleneterephthalate) (PETT). 155 Figure 20 illustrates a typical polymer for capacitive humidity-sensing.…”

Section: Hydrophobic Polymer-based Capacitive Sensorsmentioning

confidence: 99%

See 1 more Smart Citation

Humidity Sensors: A Review of Materials and Mechanisms

Chen¹,

Lu²

2005

Sen Lett

1,344

708

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We have reviewed humidity sensors based on various materials for both relative and absolute humidity, including ceramic, semiconducting, and polymer materials. In the majority of publications, there are few papers dealing with absolute humidity sensors, which have extensive applications in industry. We reviewed extensively absolute humidity sensors in this article, which is unique comparing with other reviews of humidity sensors. The electrical properties of humidity sensors such as sensitivity, response time, and stability have been described in details for various materials and a considerable part of the review is focused on the sensing mechanisms. In addition, preparation and characterization of sensing materials are also described. For absolute humidity sensors, mirrorbased dew-point sensors and solid-state Al 2 O 3 moisture sensors have been described. As the major problem in Al 2 O 3 moisture sensors, long-term instability, has been solved, -Al 2 O 3 moisture sensors may have promising future in industry.

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Section: Hydrophobic Polymer-based Capacitive Sensorsmentioning

confidence: 99%

“…In addition, polyimides can also be used as substrates for humidity sensors. 149 The polyimide (Kapton) can be doped with carbon to become conductive. Between the polyimide substrate and the sensing film (made of other polymers), the adherence is strong and the mismatch in thermal coefficients is small.…”

Section: Hydrophobic Polymer-based Capacitive Sensorsmentioning

confidence: 99%

Humidity Sensors: A Review of Materials and Mechanisms

Chen¹,

Lu²

2005

Sen Lett

1,344

708

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show abstract

“…Previous studies have defined the carbonized (graphitized) temperatures for PI, while also showing it to lack a definitive melting temperature, and that carbonization or graphitization is possible by laser energy irradiation [ 43 , 44 , 45 ]. As such, the PI used in our experiment was also expected to undergo carbonization or graphitization, by laser energy irradiation, and subsequently have altered electrical characteristics.…”

Section: Methodsmentioning

confidence: 99%

Surface Characteristics of Polymers with Different Absorbance after UV Picosecond Pulsed Laser Processing Using Various Repetition Rates

Ham

Lee

2020

Polymers

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We experimented with two polymer materials with different ultraviolet (UV) wavelength absorption characteristics, which are commonly used in flexible devices, by applying an ultrashort-pulsed laser of a 355-nm UV wavelength for 10 ps. The laser parameters studied were pulse repetition rate, laser irradiation method, and laser power condition. Previous studies using polyethylene terephthalate (PET), which does not exhibit linear absorption at a UV wavelength, have focused on processing trends resulting in minimal collateral damage around the laser-induced ablation. However, our results showed a trend of accumulating such damage irrespective of the laser parameters. Meanwhile, polyimide (PI) exhibited a completely different behavior depending on the laser parameters. At low pulse repetition rates, minimal collateral damage was observed, whereas at high repetition rates, the morphology varied considerably. The electrical characteristics of the laser-processed materials were found to be correlated with the variations in morphology. In the case of PI, such variations in electrical resistance and morphology indicated that the material was carbonized. The findings of this study are expected to provide a useful reference when selecting parameters for the laser processing of similar polymer materials.

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“…While the Kapton polyimide is a good insulator, research has shown that the laser-carbonized filaments are fair conductors. Additional opportunities to increase the effectiveness of some sensor designs lie in the fact that the carbonized filaments are porous and their resistivity can be manipulated easily during processing [46].…”

Section: Pressure Sensors Based Polyimidementioning

confidence: 99%

Sensor Applications of Polyimides

Paşahan¹

2012

High Performance Polymers - Polyimides Based - From Chemistry to Applications

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Polymeric humidity sensor based on laser carbonized polyimide substrate

Cited by 24 publications

References 26 publications

Humidity Sensors: A Review of Materials and Mechanisms

Humidity Sensors: A Review of Materials and Mechanisms

Surface Characteristics of Polymers with Different Absorbance after UV Picosecond Pulsed Laser Processing Using Various Repetition Rates

Sensor Applications of Polyimides

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