PVA Treated PEDOT-PSS: TiO2 Nanocomposite Based High-Performance Sensors Towards Detection of Relative Humidity and Soil Moisture Content for Agricultural Applications

Khasim, Syed; Pasha, Apsar; Badi, N.; Lakshmi, Mohana; Al-Ghamdi, S. A.; Al‐Aoh, Hatem A.

doi:10.1007/s10924-020-01905-6

Cited by 28 publications

(15 citation statements)

References 41 publications

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“…A large number of charge carriers get accumulated within the host matrix. 32 The hydroxyl groups in PVA were continuously connected via water molecules, and multilayer hydrogen bonds were constructed. According to the Grotthuss chain reactions [H 3 O + (H 2 O) n ] → [H 2 O H 3 O + (H 2 O) n −1 ] → ··· → [(H 2 O) n H 3 O + ] ( n = 1, 2, 3, ···), hydrogen ions jumped forward continuously and orderly along the proton wire which is connected by hydrogen bonds, thus increasing the charge carrier mobility significantly.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The hysteresis performance of the flexible humidity sensor was characterized from 12 to 98% RH. Five different RH environments (12,32,58,75, and 98% RH) were applied to test the resistive response during both the adsorption and desorption processes. It was observed from Figure 2b that the humidity sensor showed almost no hysteresis below 40% RH, and the positive and negative strokes showed good consistency.…”

Section: Sensor Calibration and Hysteresis Analysismentioning

confidence: 99%

Section: Sensor Calibration and Hysteresis Analysismentioning

confidence: 99%

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Hysteresis Dynamic Modeling and Analysis of Flexible Nano Silver–Polyvinyl Alcohol Humidity Sensor Based on the Microscopic Process and Langmuir–Fick Theory

Xia

Wang

et al. 2022

ACS Omega

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In recent years, advances in materials science and manufacturing technologies have facilitated the development of flexible sensors. However, there are still performance gaps between emerging flexible sensors and traditional silicon-based rigid sensors, especially lacking dynamic modeling and optimization analysis for addressing above challenges. This paper describes a hysteresis dynamic modeling method for flexible humidity sensors. Through inkjet printing and coating methods, the polyvinyl alcohol (PVA) sensitive layer and nano silver interdigital electrode are fabricated on flexible polyethylene naphthalate substrates. The performance characterization results show that the sensitivity and maximum hysteresis within the range of 12–98% relative humidity (RH) are −0.02167 MΩ/% RH and 2.7% RH, respectively. The sensor also has outstanding dynamic response ability and stability in a wide range of humidity variation. The hysteresis mechanism of flexible humidity sensors is theoretically analyzed from microscopic hysteresis processes, Langmuir monomolecular adsorption dynamic modeling, and Fick diffusion dynamic modeling. These hysteresis models provide a path for the hysteresis optimization of flexible PVA humidity sensors. Further exploration of the diffusion rate of water molecules and the proportion of PVA in ink represents promising hysteresis optimization directions of flexible humidity sensors based on PVA-sensitive material.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Sensor Calibration and Hysteresis Analysismentioning

confidence: 99%

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Hysteresis Dynamic Modeling and Analysis of Flexible Nano Silver–Polyvinyl Alcohol Humidity Sensor Based on the Microscopic Process and Langmuir–Fick Theory

Xia

Wang

et al. 2022

ACS Omega

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“…Recently, nanocomposite lms of PEDOT:PSS doped with a few wt% of titania nanoparticles (2-10 wt%) were used to determine the moisture content within model soils (montmorillonite and kaolinite). 69 The resistance of the nanocomposite PEDOT:PSS displayed a linear response to changing soil moisture content, with a dependency on the specic soil type itself.…”

Section: Pedot In the Environmentmentioning

confidence: 97%

Recent advances in the aqueous applications of PEDOT

Rudd

Evans

2022

Nanoscale Adv.

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“…[52] Polyvinyl alcohol, a known hydrophilic polymer, was inserted in the PEDOT:PSS films to perform water molecule detection measured through impedance and capacitive phenomena in the range from 0-80 RH%; [52] and when doped with TiO 2 presented satisfactory stability and reproducibility of chemiresistors for relative humidity measurements. [53] Other polymers mixed with PEDOT:PSS were studied to detect humidity as polyamide [54] and polyacrylonitrile nanofibers. [55] For the development of organic devices, the hygroscopic polyethylene oxide (PEO) is drawing attention as a semicrystalline, biocompatible, biodegradable, water-soluble, and toxicity-free polymer.…”

Section: Introductionmentioning

confidence: 99%

Humidity Sensor Based on PEO/PEDOT:PSS Blends for Breath Monitoring

Silva

Duc

Redon

et al. 2021

Macro Materials & Eng

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The discrimination of humidity in exhaled breath is of utmost importance to turn breath analysis into an efficient noninvasive tool for early diagnosis or treatment monitoring of several diseases. Herein, by assembling different ratios of the conductive poly(3,4-ethylenedioxythiophene): polystyrene sulfonate with the polymer matrix polyethylene oxide (PEO), humidity chemiresistor-based sensors are designed and investigated. The testing results display a broad relative humidity detection range (6-92%), repeatability, reproducibility, and good reversibility. Meanwhile, the sensors possess good reliability for distinct temperatures and in the presence of typical volatile organic compounds found in human exhaled air. The hygroscopic idiosyncrasy of PEO is attributed to be the main responsible for the high sensibility toward humidity. In a proof-of-principle for detection of respiration humidity, the outcome shows the ability of the chemiresistors to detect the humidity variation in a real case of breath exposure up to 2 s intervals. The 30 d trial of stability readings shows a standard deviation of only 2.6%. These sensing devices appear as a new array component able to distinguish moisture from biomarkers of diagnosed diseases in breath analysis.

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PVA Treated PEDOT-PSS: TiO2 Nanocomposite Based High-Performance Sensors Towards Detection of Relative Humidity and Soil Moisture Content for Agricultural Applications

Cited by 28 publications

References 41 publications

Hysteresis Dynamic Modeling and Analysis of Flexible Nano Silver–Polyvinyl Alcohol Humidity Sensor Based on the Microscopic Process and Langmuir–Fick Theory

Hysteresis Dynamic Modeling and Analysis of Flexible Nano Silver–Polyvinyl Alcohol Humidity Sensor Based on the Microscopic Process and Langmuir–Fick Theory

Recent advances in the aqueous applications of PEDOT

Humidity Sensor Based on PEO/PEDOT:PSS Blends for Breath Monitoring

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