Sensing behaviors of polypyrrole sensor under humidity condition

Cho, Jaehyun; Yu, Jae‐Young; Kim, Jung-Suk; Sohn, Sung-Ok; Lee, Duk–Dong; Huh, Jeung-Soo

doi:10.1016/j.snb.2004.12.082

Cited by 137 publications

(65 citation statements)

References 15 publications

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“…This shows that water vapor is adsorbed on the surface of GO, which increases its conductivity drastically due to proton exchange. According to the literature, the response time is defined as the amount of time required for the impedance to change by 90% of the total impedance [29]. For the sensor exposed to 60% RH, the response time was about 100 s. This compares well with the response times for other humidity sensors reported in the literature [30]- [32].…”

Section: Humidity Sensing Experimentssupporting

confidence: 64%

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Naik¹,

Krishnaswamy²

2016

Graphene

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In this article, we report on a room-temperature humidity sensing device using graphene oxide (GO) thin films synthesized by chemical exfoliation. Changes in the device conductivity are measured for varying relative humidity in the experimental chamber. Experiments are carried out for relative humidity varying from 30% to 95%. We observe a difference in the results obtained for low relative humidity (<50%) and high relative humidity (>50%), and propose a sensing mechanism to explain this difference. Although the sensor exhibits some hysteresis at high relative humidities, a method to "reset" the sensor is also proposed. The sensing device has high sensitivity and fast response time.

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Section: Humidity Sensing Experimentssupporting

confidence: 64%

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Naik¹,

Krishnaswamy²

2016

Graphene

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“…The absence of response to NO 2 is attributed to the highly doped state of the polypyrrole and therefore the inability for an electron acceptor like NO 2 to extract further electrons from the backbone. Polypyrrole-based gas sensors are reported to be sensitive to humidity with as much as 75% decrease in response resulting from a 5% increase in relative humidity [31]. The problem of humidity can be resolved by passing the sample through a desiccant before analyzing or replacing the chloride with a more hydrophobic dopant such as ptoluene sulfonate.…”

Section: Gas Sensingmentioning

confidence: 99%

Single Polypyrrole Nanowire Ammonia Gas Sensor

et al. 2007

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We report the synthesis, electrical characterization and ammonia gas sensing with single nanowire of conducting polypyrrole. Three hundred nanometer in diameter and 50 to 60 mm long polypyrrole nanowires were synthesized by chemical polymerization inside SiO 2 coated alumina membranes. Temperature dependent electrical resistance studies established that the chemically synthesized nanowires were more ordered compared to electrochemically synthesized nanowires. We further demonstrated that gas sensors based on single polypyrrole nanowire exhibited good sensitivity towards ammonia, and provided a reliable detection at concentration as low as approximately 40 ppm.

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“…5(a) to estimate the humidity sensing properties. Generally, the time taken by a sensor to reach 90% of the total impedance change is defined as the response time or recovery time [40]. The response time (as the humidity changes from 11% to 95% RH) is about 2 s and the recovery time (as the humidity changes from 95% to 11% RH) is about 50 s. The adsorption and desorption processes of water vapor are corresponding to the exothermic and endothermic processes, and the endothermic speed is slower than exothermic speed [39].…”

Section: Humidity Sensing Properties Of Nbt-bt6 Nanofibersmentioning

confidence: 99%