Humidity sensor using cross-linked poly(chloromethyl styrene)

Sakai, Yoshiro; Matsuguchi, Masanobu; Hurukawa, T.

doi:10.1016/s0925-4005(00)00313-0

Cited by 150 publications

(69 citation statements)

References 3 publications

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“…4,5,[9][10][11][12][13][14] The thickness of the polyelectrolyte closely affects the humidity sensitivities, such as hysteresis and response or recovery time. 15,16 In addition, IDEs-type humidity sensors exhibited a significant change in impedance with a change in the number of fingers and gap size between electrode fingers, which are related to the design of the electrode.…”

Section: -29mentioning

confidence: 99%

AC Complex Impedance Study on the Resistive Humidity Sensors with Ammonium Salt-Containing Polyelectrolyte using a Different Electrode Pattern

Cha¹,

Gong²

2013

Bulletin of the Korean Chemical Society

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We examined the effect of electrode fingers and gaps of coplanar interdigitated electrode (IDE) structures to characterize the ammonium salt-containing polyelectrolyte film of resistance-based humidity sensors. IDEs designed for this purpose were flexible gold electrodes deposited on a polyimide substrate using a printing process because the geometry presents a potential for tunable sensitivity over other electrode designs. The basic design of the sensors consisted of IDEs with a different number of electrode fingers such as 3, 4, and 5 and gap sizes of 310, 360, 410, and 460 µm. Details of the AC complex impedance characteristics such as the Nyquist plot, Bode plot, and activation energy based on electrode construction were investigated.

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Section: -29mentioning

confidence: 99%

AC Complex Impedance Study on the Resistive Humidity Sensors with Ammonium Salt-Containing Polyelectrolyte using a Different Electrode Pattern

Cha¹,

Gong²

2013

Bulletin of the Korean Chemical Society

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“…12,23,24,30,31 Thus the polyelectrolyte-based humidity sensors usually have difficulty in detecting low humidity due to the high impedance involved. Although it is known that PPy is a typical intrinsic conducting polymer, its conduction mechanism is mainly electronic.…”

Section: Humidity Sensing Mechanismmentioning

confidence: 99%

Synthesis and humidity sensitive properties of pyrrole‐based polyelectrolytes

Hong

et al. 2009

J of Applied Polymer Sci

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Pyrrole (Py)-based polyelectrolytes (Py-PE): P(Py-COOLi), P(Py-COONa), and P(Py-COOK) was synthesized, characterized, and used to prepare thin film resistive humidity sensors. Their humidity sensitive properties have been investigated, and sensing mechanism was presented. The Py-PE contains PPy as backbone and the side chain bearing carboxylic salt group, which made its sensor exhibited a very wide humidity sensing range of 0-97% relative humidity (RH), high conductivity even at very low humidity, and both ionic and electronic conduction contributed to its conductivity. Among all the Py-PE, P(Py-COOK) showed high sensitivity, with the impedance changing of about three orders of magnitude (10 3 -10 6 X) from 97 to 0% RH, whereas P(Py-COONa) showed quick response for both absorption (12.5 s) and desorption (15.2 s). Py-PE prepared is promising for preparation of thin film resistive humidity sensors capable of detecting low humidity.

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“…[5][6][7][8][9][10] The chemical structure of the polymer system determines sensor's sensitivity, stability, reliability and electrical characteristics. [11][12][13] However, long-term stability of the acryl-type humidity-sensitive membrane is not expected, especially in high humidity and high temperature region. The humidity sensors made from polyelectrolytes possess a poor durability against water or dew, because they are generally soluble in water.…”

Section: Introductionmentioning

confidence: 99%

Polymeric humidity sensor using polyelectrolyte derived from poly(amide-sulfone)s

Jeon

Gong

2009

Macromol. Res.

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New polyelectrolytes derived from poly(amide-sulfone)s and 1,5-dibromopentane were simultaneously fabricated on the electrode by the crosslinking reaction. The substrate was pretreated with a bromoalkyl-containing, silane-coupling agent to anchor the humidity-sensitive membrane to the substrate through the covalent bond. When the resistance dependence on the relative humidity of the crosslinked poly(amide-sulfone)s was measured, the resistance varied by three orders of magnitude between 20%RH and 90%RH, which was the required RH range for a humidity sensor operating at ambient humidity. Their water durability, long-term stabilities under various environments, hysteresis and response and recovery times were measured and evaluated as a humidity-sensing membrane.

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Humidity sensor using cross-linked poly(chloromethyl styrene)

Cited by 150 publications

References 3 publications

AC Complex Impedance Study on the Resistive Humidity Sensors with Ammonium Salt-Containing Polyelectrolyte using a Different Electrode Pattern

AC Complex Impedance Study on the Resistive Humidity Sensors with Ammonium Salt-Containing Polyelectrolyte using a Different Electrode Pattern

Synthesis and humidity sensitive properties of pyrrole‐based polyelectrolytes

Polymeric humidity sensor using polyelectrolyte derived from poly(amide-sulfone)s

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