Studies on PVP, PVA and their nAg composites based humidity sensors

Mahapure, Poonam D.; Gosavi, Suresh; Aiyer, R. C.

doi:10.1109/ispts.2015.7220108

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…With an increase in reaction time, the peak becomes sharp, indicating a reduction in particle size and dispersivity, with an increase in absorption intensity indicating an increase in Ag particle density. As discussed in our previous work, 360 min is considered to be an optimum reaction time for nAg/0.1% PVP composite formation. This is because after this time a redshift starts to appear in the UV–vis spectra [see Figure (a)], indicating an increase in particle size .…”

Section: Resultsmentioning

confidence: 99%

“…The nAg/0.1% PVP composite was synthesized by reducing silver salt with the help of trisodium citrate as a reducing agent in the presence of 0.1 wt % capping agent PVP, as explained in our previous work . The reaction is carried out at 80 °C.…”

Section: Methodsmentioning

confidence: 99%

“…The reaction is carried out at 80 °C. During formation of the nAg/0.1% PVP nanocomposite, 0.1 wt % of PVP, 0.001 M of silver salt, and 0.02 M of reducing agent were used, with a total reaction time ( T t ) of 360 min.…”

Section: Methodsmentioning

confidence: 99%

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Combination of polymeric substrates and metal–polymer nanocomposites for optical humidity sensors

Mahapure

Gangal

Aiyer

et al. 2018

J of Applied Polymer Sci

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This paper reports a combination of self-supported, 80-μm-thick polymeric substrates of poly(dimethyl siloxane), poly(methyl methacrylate), poly(vinyl alcohol) (PVA), and poly(N-vinylpyridine) (PVP) and nanocomposites, silver nanoparticle (nAg)/ 0.1% PVP (S1) and nAg/0.1% PVA (S2), for use in optical-transmission-type humidity sensors. Composites are synthesized by a chemical reduction method at optimum conditions, giving particle sizes of 5-10 nm and 10-20 nm, respectively, for nAg/0.1% PVP and nAg/ 0.1% PVA. Composite formation is confirmed using Fourier transform infrared spectroscopy (FTIR). The role of polymers in obtaining a smaller Ag particle size is studied using ultraviolet-visible spectroscopy and transmission electron microscopy. The nanocomposite is coated onto substrates either on a single side or on both sides by dip coating. The humidity response of nAg/0.1% PVP-0.1% PVP-nAg/0.1% PVP (S1-PVP-S1) sensors, measured using the direct optical transmission method, exhibits an enhancement in sensitivity [0.88 AE 0.04 (/% RH)] for the humidity range 6-94% RH and response (6 s) and recovery (8 s) times compared to nAg/0.1% PVP-PVP S1-PVP sensors and a linear response (R 2 ≥ 0.99). An attempt is made to explain the sensing process with the help of FTIR spectra in dry and humid environments.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Combination of polymeric substrates and metal–polymer nanocomposites for optical humidity sensors

Mahapure

Gangal

Aiyer

et al. 2018

J of Applied Polymer Sci

Self Cite

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“…Table 2 represents three classes of material types (polymers, ceramics and polymer/ceramic) [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. Additional classification becomes more complicated as some materials can be attributed to multiple classes of materials.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

et al. 2021

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The development of polyaniline (PANI)/biomaterial composites as humidity sensor materials represents an emerging area of advanced materials with promising applications. The increasing attention to biopolymer materials as desiccants for humidity sensor components can be explained by their sustainability and propensity to absorb water. This review represents a literature survey, covering the last decade, which is focused on the interrelationship between the core properties and moisture responsiveness of multicomponent polymer/biomaterial composites. This contribution provides an overview of humidity-sensing materials and the corresponding sensors that emphasize the resistive (impedance) type of PANI devices. The key physicochemical properties that affect moisture sensitivity include the following: swelling, water vapor adsorption capacity, porosity, electrical conductivity, and enthalpies of adsorption and vaporization. Some key features of humidity-sensing materials involve the response time, recovery time, and hysteresis error. This work presents a discussion on various types of humidity-responsive composite materials that contain PANI and biopolymers, such as cellulose, chitosan and structurally related systems, along with a brief overview of carbonaceous and ceramic materials. The effect of additive components, such as polyvinyl alcohol (PVA), for film fabrication and their adsorption properties are also discussed. The mechanisms of hydration and proton transfer, as well as the relationship with conductivity is discussed. The literature survey on hydration reveals that the textural properties (surface area and pore structure) of a material, along with the hydrophile–lipophile balance (HLB) play a crucial role. The role of HLB is important in PANI/biopolymer materials for understanding hydration phenomena and hydrophobic effects. Fundamental aspects of hydration studies that are relevant to humidity sensor materials are reviewed. The experimental design of humidity sensor materials is described, and their relevant physicochemical characterization methods are covered, along with some perspectives on future directions in research on PANI-based humidity sensors.

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“…In humidity sensors, amalgamating polymers with different affinities for water molecules or porous or amorphous structures can lead to a sensing layer with fine-tuned humidity-sensing performance. In particular, some works exhibit the combination of PVA/PVP sensing films as a good alternative for humidity sensors [29,30]. PVP is an amorphous polymer that exhibits high compatibility with PVA.…”

Section: Introductionmentioning

confidence: 99%

Boosting the Sensitivity and Hysteresis of a Gel Polymer Electrolyte by Embedding SiO2 Nanoparticles and PVP for Humidity Applications

Cedeño Mata,

Orpella,

Dominguez-Pumar

et al. 2024

Gels

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Enhancing sensitivity and hysteresis in capacitance humidity sensors is vital for precise, reliable, and consistent humidity control. This study explores this concern by incorporating polyvinylpyrrolidone (PVP) and SiO2 nanoparticles into a polyvinyl alcohol (PVA)-based ionic liquid gel polymer electrolyte (ILGPE), studying two capacitor types: ILGPE and SiO2 composite ILGPE (CILGPE) capacitors. These novel electrolytes use ammonium acetate as a plasticiser, 1-butyl-3-methylimidazolium bromide as an ionic liquid, SiO2 nanoparticles as a composite, and PVA and PVP as host polymers. Capacitors were characterised and modelled using impedance spectroscopy (IS), providing an electrophysical insight into their working principle. Sensitivity and hysteresis were evaluated within a 20–90% relative humidity (RH) range at 25 °C. The SiO2 CILGPE capacitor with PVP presented superior sensitivity and hysteresis, revealing the beneficial combination of SiO2 nanoparticles and PVP. These benefits are due to the creation of pathways that facilitate water molecule diffusion and crystallinity reduction in PVA-ILGPE. In particular, at 10 kHz, it demonstrates a calibrated capacitance sensitivity of 2660 pF/%RH and a hysteresis of 3.28 %RH. This optimised capacitor outperforms some previous humidity capacitive sensors in sensitivity while exhibiting low hysteresis.

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Studies on PVP, PVA and their nAg composites based humidity sensors

Cited by 5 publications

References 5 publications

Combination of polymeric substrates and metal–polymer nanocomposites for optical humidity sensors

Combination of polymeric substrates and metal–polymer nanocomposites for optical humidity sensors

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

Boosting the Sensitivity and Hysteresis of a Gel Polymer Electrolyte by Embedding SiO2 Nanoparticles and PVP for Humidity Applications

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