Conductive Polymer (Graphene/PPy)–BiPO4 Composite Applications in Humidity Sensors

Zhu, Zhen; Lin, Wang‐De; Lin, Zhiyi; Chuang, Ming-Hong; Wu, Ren‐Jang; Chavali, Murthy

doi:10.3390/polym13122013

Cited by 13 publications

(7 citation statements)

References 48 publications

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“…The Grotthuss chain reaction mechanism contribution (free proton displacement) is of ionic nature and is one of the most relevant for many types of proton conductors [11]. Based on their noteworthy electrical response variation as a function of RH, enumerable materials have been evaluated for this purpose, such as conductive polymers [12], carbon-based materials [13], metal oxides [14] and metal oxide composites [15], in many different shapes, such as volume shaped and thick or thin films [16][17][18], and fabricated by diverse routes, like moulding, CVD, sputtering and electrospinning, just to mention some [1]. Several inorganic compounds, including fluorite and perovskites-based materials [19,20], as well as some ion exchangers such as Sb 2 O 5 •nH 2 O, ZrO 2 •nH 2 O, or SnO 2 •nH 2 O, also display ionic conduction [21].…”

Section: Introductionmentioning

confidence: 99%

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Mendes

Kurapova

Faia

et al. 2022

J Solid State Electrochem

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Humidity sensors are in high demand for many applications, such as environmental monitoring and air and food quality control. Despite many inorganic and organic materials exhibit moisture sensing properties, the electrical response of many existing sensors is not stable along the time. Polyantimonic acid (PAA) is characterized by elevated proton conductivity and by high thermal stability: consequently, it is seen as promising proton conductor for usage in humidity sensing devices. In this work, for the first time, PAA-based bulk solid membranes were produced and tested as potential materials for relative humidity (RH) detection and their moisture sensitivity was evaluated. Two different amounts of binder were used for moulding the solid sensors: the ones with 10% of binder were designated as 90PAA, while the ones with 20% were named 80PAA. The structures of the solid samples were investigated by X-ray diffraction (XRD) technique, adsorption–desorption curves via Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) techniques. The electrical behaviour was examined at ambient temperature by electrical impedance spectroscopy in the entire relative humidity (RH) interval (0–100%) and in the frequency range of 40 Hz up to 60 MHz. Electrical response of the materials was correlated with the structural features of the membranes. Both 90PAA and 80PAA sensors showed total resistance 3 × 105 and 3.5 × 105 Ω at 10% RH, respectively. A linear decrease of the resistance on RH was observed in the range 30–90% RH for both sensors. The electrical response of the evaluated PAA-based sensors displays good repeatability and reproducibility: the ones with lower binder content showed higher moisture sensitivity as well as very good time stability over 1 year.

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Section: Introductionmentioning

confidence: 99%

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Mendes

Kurapova

Faia

et al. 2022

J Solid State Electrochem

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“…As relative humidity (RH) increases, physical adsorption promotes more layers of water molecule adsorption on the sensitive film. 295,296 As water molecules are easily ionized in an electrostatic field and hydronium ions are spontaneously generated and transferred between adjacent water molecules, i.e., the Grotthuss chain reaction: 297 which remarkably facilitates the transfer of carriers and thus changes the output of the humidity sensor (Figure 13d). 293 Fiber humidity sensors can be prepared by coating conjugated polymers on commercial fibers with high strength and flexibility using a simple dip-coating technique.…”

Section: Polymer Light-emitting Electrochemicalmentioning

confidence: 99%

“…Initially, the surface layer of water molecules is adsorbed into active materials through the formation of chemical bonds. As relative humidity (RH) increases, physical adsorption promotes more layers of water molecule adsorption on the sensitive film. , As water molecules are easily ionized in an electrostatic field and hydronium ions are spontaneously generated and transferred between adjacent water molecules, i.e., the Grotthuss chain reaction: H 2 O + H 3 O + → H 3 O + + H 2 O, which remarkably facilitates the transfer of carriers and thus changes the output of the humidity sensor (Figure d) …”

Section: Applications and Devicesmentioning

confidence: 99%

Soft Fiber Electronics Based on Semiconducting Polymer

et al. 2023

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Fibers, originating from nature and mastered by human, have woven their way throughout the entire history of human civilization. Recent developments in semiconducting polymer materials have further endowed fibers and textiles with various electronic functions, which are attractive in applications such as information interfacing, personalized medicine, and clean energy. Owing to their ability to be easily integrated into daily life, soft fiber electronics based on semiconducting polymers have gained popularity recently for wearable and implantable applications. Herein, we present a review of the previous and current progress in semiconducting polymer-based fiber electronics, particularly focusing on smart-wearable and implantable areas. First, we provide a brief overview of semiconducting polymers from the viewpoint of materials based on the basic concepts and functionality requirements of different devices. Then we analyze the existing applications and associated devices such as information interfaces, healthcare and medicine, and energy conversion and storage. The working principle and performance of semiconducting polymer-based fiber devices are summarized. Furthermore, we focus on the fabrication techniques of fiber devices. Based on the continuous fabrication of one-dimensional fiber and yarn, we introduce two-and three-dimensional fabric fabricating methods. Finally, we review challenges and relevant perspectives and potential solutions to address the related problems.

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“…Besides, in order to evaluate the reproductivity of the sensor comprehensively, response and recovery performances of the humidity sensors in the RH range of 11-55% and 11-97% are also studied (Figure S5 and S6), respectively, showing a good consistent with the result in Figure 2d, 2E and 2F shows the transient response of the proposed humidity sensor with GO sensing film thickness 300 nm. It is obseverd that the resistance of the proposed humidity sensor drops rapidly and gradually stabilizes with humidity value increasing from low RH (11%) to high RH (97%), and remarkably rises and tends to a constant value as the humidity value reduces from high RH (97%) to low RH Scotch-tape graphene 600/400 (5-75% RH) 0.714 70 [50] Reduced-GO 50/3 (11-95% RH) 0.514 84 [51] GO-silicon bilayer 19/10 (45-98% RH) 1.016 53 [52] MXene-GO 58/104 (3-91% RH) 1.139 88 [53] PPy/BiPO 4 340/60 (12-90% RH) 1.229 78 [54] Black P/graphene 9/30 (15-70% RH) 0.620 55 [55] Reduced-GO 28/48 (30-90% RH) 1.124 60 [56] Abbreviation: GO, graphene oxide.…”

Section: Humidity Response Of the Sensormentioning

confidence: 99%

High‐performance flexible humidity sensors for breath detection and non‐touch switches

et al. 2022

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Flexible humidity sensors have attracted much attention due to the promising applications in medical health monitoring. Up to now, the realization of such devices with ultrafast response/recovery and wide humidity range still remains a challenge. In this work, we report a new type of humidity sensor based on laser-induced graphene (LIG) and graphene oxide (GO) with excellent performances. Graphene interdigital electrodes with good conductivity were prepared by the laser-induced method. Then, the GO dispersion was drop-coated on the interdigital electrode and heated to form a film as a sensing material. We have systematically studied the performances of the humidity sensor under different humidity levels. The experiment results reveal that the humidity sensor possesses high response, fast response/recovery behavior with 2 and 35 seconds, and wide humidity range from 11% RH to 97% RH. This proposed high-performance humidity sensors could be applied in practical applications such as human breath monitoring under different states including slow breath, normal breath, fast breath, cough and rhinitis. In addition, the humidity sensors could also be used to monitor the approaching of fingertips, which makes the sensors be ideal non-contact buttons of the elevator for stopping contacting spread of COVID-19 viruses.

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Conductive Polymer (Graphene/PPy)–BiPO4 Composite Applications in Humidity Sensors

Cited by 13 publications

References 48 publications

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Soft Fiber Electronics Based on Semiconducting Polymer

High‐performance flexible humidity sensors for breath detection and non‐touch switches

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