The effect of initial conductivity and doping anions on gas sensitivity of conducting polypyrrole films to NH3

Brie, M.; Turcu, Rodica; Neamţu, C.; Pruneanu, Stela

doi:10.1016/s0925-4005(97)80125-6

Cited by 63 publications

(22 citation statements)

References 17 publications

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“…In addition, the conductivity decreased when a larger strain was applied, which can also lead to a higher sensitivity under a less conductive state, and a similar phenomenon was observed in a polypyrrole-based sensor. 41 The results indicate that the sensor with a resistance in the range of 5 × 10 4 Ω under strain would provide better gas sensitivity. However, upon exposure to CH 4 gas, the sensor resistance under 70% strain becomes too large (410 3 MΩ) to be accurately recorded by the equipment.…”

Section: Microstructure Characteristicsmentioning

confidence: 92%

A semitransparent snake-like tactile and olfactory bionic sensor with reversibly stretchable properties

et al. 2017

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Many organisms and animals have sensing abilities that are different from those of human beings; for example, snakes have strong smell-, vibration-, touch-and heat-sensing abilities. A nature-mimicking sensing platform capable of sensing multiple stimuli, such as strain, pressure, temperature and other uncorrelated conditions, is highly desirable to broaden the applications of sensors. Here, we construct a semitransparent intelligent skin-like sensing platform based on polyaniline (PANI) nanowire arrays that can act as a bionic component by simultaneously sensing tactile stimuli and detecting colorless, odorless gas. Our multifunctional bionic sensing strategy is remarkably adaptive for versatile applications. The strain-sensing performance is superior to that of most conducting polymer-based sensors reported so far and is comparable to or even better than traditional metal and carbon nanowire/nanotube-based strain sensors. The highest gauge factor demonstrated is 149, making our system a remarkable candidate for strain-sensing applications. The sensor can accurately detect a wide range of human motions. We also demonstrate the simultaneous controlled olfaction ability for the detection of methane with high sensitivity and a fast response time. These results enable the realization of multifunctional and uncorrelated sensing capabilities, which will afford a wide range of applications to augment robotics, treatment, simulated skin, health monitoring and bionic systems. NPG Asia Materials (2017) 9, e437; doi:10.1038/am.2017.181; published online 13 October 2017 INTRODUCTION Stretchable and wearable electronics have been extensively investigated for a broad range of applications, including electronic skins, flexible displays, health-monitoring devices and energy-harvesting devices. [1][2][3][4] Breakthroughs have been made in the theoretical and practical aspects of these related technologies. Meanwhile, it is highly attractive to integrate more functionalities and novel features into one device for smart and multifunctional systems by mimicking complex biological systems. Among the various complex biological systems, snakes are unique legless reptiles with elongated bodies covered in overlapping scales. Most snakes use stretchable belly scales to travel by gripping surfaces and have strong olfactory capabilities to track prey. The skin and olfactory organ can collect external stimuli and output bioelectrical signals to the nervous system/brain. In practical applications, artificial e-skin capable of sensing multiple stimuli, such as strain, pressure, vibration, temperature and other uncorrelated conditions, is highly desirable. Despite the promise of these systems, only limited successful examples of stretchable sensors that perceive force and chemical stimuli have been reported. [5][6][7] To achieve high-performance artificial e-skin, the directional design and fabrication of conductive sensing channel materials are prerequisites. Tailored materials in the sensing channel with specific nanostructures can meet cri...

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Section: Microstructure Characteristicsmentioning

confidence: 92%

A semitransparent snake-like tactile and olfactory bionic sensor with reversibly stretchable properties

et al. 2017

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“…These conditions led to a gas sensor ( Figure 2) operating at room temperature with high detection efficiency, good reproducibility, fast response, and low detection limit (around 3 ppm) that is below the ammonia toxicity values, since the long-term allowed concentration in which people may work is 20 ppm [31]. Other studies from Carquigny et al [24] and Brie et al [32] presented ammonia sensors using electrosynthesized PPy film doped with either lithium perchlorate or toluenesulfonic acid but the detection limit of these sensors was higher (around 10 ppm). The sensitivity of the sensors was greatly improved for polypyrrole doped with perchlorate anions.…”

Section: Gas Sensors Based On Electrodeposited Polymer Filmsmentioning

confidence: 97%

“…Consequently, electron transfers between polymers and gas analytes alter the doping level of polymers and cause the changes in resistance of the sensing material (Table 3). This process occurs for example when PPy or PANI films are exposed to NH3, NO2, or other redox-active gases [23,[31][32][33][34][35]49,50]. Electron acceptors, such as NO2, can remove electrons from the aromatic rings of conducting polymers.…”

Section: Response Mechanismmentioning

confidence: 99%

Gas Sensors Based on Electrodeposited Polymers

Lakard

Carquigny

Segut

et al. 2015

Metals

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Electrochemically deposited polymers, also called "synthetic metals", have emerged as potential candidates for chemical sensing due to their interesting and tunable chemical, electrical, and structural properties. In particular, most of these polymers (including polypyrrole, polyaniline, polythiophene) and their derivatives can be used as the sensitive layer of conductimetric gas sensors because of their conducting properties. An important advantage of polymer-based gas sensors is their efficiency at room temperature. This characteristic is interesting since most of the commercially-available sensors, usually based on metal oxides, work at high temperatures (300-400 °C). Consequently, polymer-based gas sensors are playing a growing role in the improvement of public health and environment control because they can lead to gas sensors operating with rapid detection, high sensitivity, small size, and specificity in atmospheric conditions. In this review, the recent advances in electrodeposited polymer-based gas sensors are summarized and discussed. It is shown that the sensing characteristics of electrodeposited polymers can be improved by chemical functionalization, nanostructuration, or mixing with other functional materials to form composites or hybrid materials. OPEN ACCESSMetals 2015, 5 1372

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“…The conducting polymers are conjugated macromolecules that exhibit electrical and optical property changes when they are protonated/deprotonated by certain chemical agents. In recent years, conducting polymers, such as polypyrrole and polyaniline (PANI), have been proposed as chemical sensors based on the changes in their electric conductivity when they are exposed to ammonia (Agbor et al, 1995;Brie et al, 1996;Koul & Chandra, 2005).…”

Section: Electroluminescencementioning

confidence: 99%

Optical Fiber Sensors: An Overview

Castrellón-Uribe¹

2012

Fiber Optic Sensors

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The effect of initial conductivity and doping anions on gas sensitivity of conducting polypyrrole films to NH3

Cited by 63 publications

References 17 publications

A semitransparent snake-like tactile and olfactory bionic sensor with reversibly stretchable properties

A semitransparent snake-like tactile and olfactory bionic sensor with reversibly stretchable properties

Gas Sensors Based on Electrodeposited Polymers

Optical Fiber Sensors: An Overview

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