Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film

Sun, Aihua; Li, Zhixiang; Wei, Tianqi; Li, Yong; Cui, Ping

doi:10.1016/j.snb.2009.08.028

Cited by 88 publications

(31 citation statements)

References 37 publications

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“…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: 63%

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: 63%

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Naik¹,

Krishnaswamy²

2016

Graphene

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“…The band is observed at 1041 cm −1 , corresponding to the N H inplane deformation vibration of pyrrole rings. The band assigned to the C H in-plane stretching vibration appears at 1306 cm −1 [32]. The bands at 1462 and 1167 cm −1 can be attributed to the C C ring and C N stretching vibrations, respectively [33].…”

Section: Atr-ir Spectroscopymentioning

confidence: 98%

Functionalized polypyrrole nanotube arrays as electrochemical biosensor for the determination of copper ions

Lin

Ma³

et al. 2012

Analytica Chimica Acta

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“…Microencapsulation by PPy provides coverage on the alloy particle surface, which helps prevent corrosion and oxidation of the hydrogen storage alloy. Furthermore, the spongy PPy films on alloy surfaces lead to a decrease in contact resistance, which is beneficial for the interfacial electrochemical reactions of alloy electrodes [18]. These results suggest that improvements in cycling stability can be attributed to the PPy films deposited on the hydrogen storage alloy particles.…”

Section: Electrochemical and Kinetic Characteristicsmentioning

confidence: 87%

Electrochemical kinetic properties of AB5-type hydrogen storage alloys with chemically deposited polypyrrole

Yang

2015

Ionics

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La 0.65 Ce 0.25 Pr 0.02 Nd 0.08 Ni 3.85 Mn 0.39 Co 0.73 Al 0.31 AB 5 -type alloy was modified via the method of a simple chemical oxidative polymerization of pyrrole (Py) directly occurring on the surface of alloy particles. Field emission scanning electron microscopy and Fourier transform infrared spectroscopy revealed spongy polypyrrole (PPy) films uniformly and continuously deposited on the surface of the alloy particles. The PPy films possessed superior electrochemical redox reversibility, thus facilitating hydrogen protons transferring from electrolyte to electrode interface. Moreover, the PPy films exhibited prominent anti-corrosion properties and reduced the pulverization of the alloy particles. The PPycoated alloy received remarkable enhancement in rate capability and cyclability compared to those of the bare alloy. Due to the PPy films, the high-rate dischargeability at a discharge current density of 1500 mA g −1 (HRD 1500 ) significantly increased from 18 to 31.6 %, and the capacity retention rate after 200 cycles (S 200 ) increased from 84.2 to 89.8 %. Meanwhile, the PPy coatings decreased the charge transfer resistance and increased the hydrogen diffusion rate of the alloys, which well conformed with the HRD results.

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Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film

Cited by 88 publications

References 37 publications

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Functionalized polypyrrole nanotube arrays as electrochemical biosensor for the determination of copper ions

Electrochemical kinetic properties of AB5-type hydrogen storage alloys with chemically deposited polypyrrole

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