A capacitive humidity sensor with every fast response time and very low hysteresis

Grange, H.; Bieth, C.; Boucher, H; Delapiere, G.

doi:10.1016/0250-6874(87)80043-4

Cited by 44 publications

(12 citation statements)

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“…Figure 4 shows an impedance variation of 30 kΩ from 99% to 58% RH within 300 seconds under constant bias of 1.4 volts. Although the response time was not as fast as most polymer-based capacitive humidity sensors [22], the value is repeatable and responsive to humidity changes. Response time could be improved by increasing film thickness or using polymer with higher water absorption ability (for PW-1500, the water absorption rate is 4%).…”

Section: Resultsmentioning

confidence: 99%

Low-cost sensor tape for environmental sensing based on roll-to-roll manufacturing process

2012

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Abstract-We describe the concept of fabricating low-cost sensor tape for fine-grid environmental sensing based on roll-toroll manufacturing processes. We experiment with constructing sensors and electronic connections with low-cost conductive inkjet printed copper traces. Our first attempt is to fabricate humidity sensors by spin-coating conductive polymer on sensor substrates and integrating the design with an embedded system. The humidity sensor was tested in a two-point probe and exhibits the I-V profile of a diode. We demonstrated a working humidity sensor with an impedance variance of 30 kΩ from 99% to 58% RH within 300 seconds under a 1.4 volt bias.

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Section: Resultsmentioning

confidence: 99%

Low-cost sensor tape for environmental sensing based on roll-to-roll manufacturing process

2012

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“…Capacitive sensors are based on hydrophobic polymer films that adsorb water by hygroscopicity [109]. Good candidates to this class of materials are cellulose acetate butyrate [CAB] [110], poly(methyl metacrylate) [PMMA] [111], poly(vinyl crotonate) [PVC] [112] and poly(ethylene terephthalate) [PETT] [113].…”

Section: Characteristics and Properties Of Rh Nanostructured Polymer-mentioning

confidence: 99%

Role of nanostructured polymers on the improvement of electrical response-based relative humidity sensors

Fratoddi

Bearzotti²,

Venditti

et al. 2016

Sensors and Actuators B: Chemical

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Nanostructured polymers, with different morphologies and different spatial organizations, have found, in last few years, a wide range of uses in humidity sensors, as a viable alternative to ceramic or semiconducting materials and to oxides (perovskite) compounds. Their enhanced sensitivity towards external stimuli has made them ideal candidates in the design of humidity sensors. This is mainly due to the fact that nanostructured polymers, when embedded with different content of water, represent a heterogeneous system whose dielectric and conductometric properties varies over a wide range, resulting in advantageous sensitive material in resistive-type or capacitive-type humidity sensors. The most notable property of nanostructured polymers is their inherent electrical behavior which is closely connected to the presence of heterogeneities at a nano- or micro-scale level. In the first part of this paper, we discuss and justify, on the basis of the dielectric theory of heterogeneous systems, how the dielectric properties of nanostructured polymers, independently of their chemical nature, could vary as a consequence of a different amount of water adsorption, meeting the basic requirement of any humidity sensor device. In particular, we have analyzed systems with different porosity and different pore interconnections to cover the most part of the structural arrangements and morphologies nanostructured polymers give rise. In the second part of the paper, we present some remarkable examples of nanostructured polymers employed in the fabrication of humidity sensors based on changes in the electrical properties (permittivity and electrical conductivity) upon exposure to moisture, highlighting the main features that make them suitable for sensors, with specific emphasis to characteristic parameters, such as sensitivity, response time, hysteresis and durability

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“…Cellulose and its derivatives have been proposed for a variety of applications including coatings, laminates, optical films, pharmaceuticals, food and textiles [2][3][4][5][6][7][8]. It is also considered as a promising base material for flexible sensors due to the advantage of its low cost, light-weight, relatively high thermal stability, high sorption capacity, alterable optical appearance and biocompatibility [9,10].…”

Section: Introductionmentioning

confidence: 99%

Reduced graphene oxide filled cellulose films for flexible temperature sensor application

et al. 2015

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A capacitive humidity sensor with every fast response time and very low hysteresis

Cited by 44 publications

References 1 publication

Low-cost sensor tape for environmental sensing based on roll-to-roll manufacturing process

Low-cost sensor tape for environmental sensing based on roll-to-roll manufacturing process

Role of nanostructured polymers on the improvement of electrical response-based relative humidity sensors

Reduced graphene oxide filled cellulose films for flexible temperature sensor application

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