Humidity sensing using polyaniline/polyvinyl alcohol nanocomposite blend

Deshkulkarni, Bharat; Viannie, Leema Rose; Ganachari, Sharanabasava V.; Banapurmath, N. R.; Shettar, Ashok

doi:10.1088/1757-899x/376/1/012063

Cited by 30 publications

(26 citation statements)

References 14 publications

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“…The RH sensing mechanism in the tapered optical fiber sensor application involves the humidity sensitive coatings (hydrophilic materials) coated on the tapered region to enhance the transmission signal through the improvements on evanescent waves [6]. Some of the materials are used in the coating include polyvinyl alcohol (PVA) [7,8], chitosan [9], metallic oxide film [10], and graphene oxide (GO) [11,12]. With 880 gas sensor papers recorded in September, 2018, GO represents an important potential material for discussing [13].…”

Section: Photonic Sensorsmentioning

confidence: 99%

Single-Mode Modified Tapered Fiber Structure Functionalized With GO-PVA Composite Layer for Relative Humidity Sensing

et al. 2020

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A sensitive tapered optical fiber sensor incorporating graphene oxide (GO) and polyvinyl alcohol (PVA) composite film for the rapid measurement of changes in relative humidity was proposed and experimentally demonstrated. The sensing principle was based on the intensity modulation of the transmitted light induced by the refractive index changes of the sensitive coatings. The sensing region was obtained by tapering a section of single-mode optical fiber (SMF) from its original 125 µm diameter down to 9.03 µm. The tapered structure was then modified through deposition of GO/PVA nanocomposites by using the dip-coating technique. The field emission scanning electron microscope (FESEM) and Raman spectroscopy were used to characterize the structure of the composite film. As evidenced by a Fourier transform infrared spectroscopy (FTIR) analysis, the presence of oxygen functional groups (such as-OH and COOH) on the GO structure enabled the attachment of PVA molecules through hydrogen bonding and strong adhesion between GO/PVA layers. The performance of the sensor was tested over a wide range (20% RH to 99.9% RH) of relative humidity. The sensor showed a good response with its signal increasing linearly with the surrounding humidity. The tapered optical fiber sensor with the coating of GO/0.3 g PVA achieved the highest sensitivity [0.5290 RH (%)]. The stability, repeatability, reversibility, as well as response time of the designated sensor were also measured and analyzed.

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Section: Photonic Sensorsmentioning

confidence: 99%

Single-Mode Modified Tapered Fiber Structure Functionalized With GO-PVA Composite Layer for Relative Humidity Sensing

et al. 2020

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“…Although the conductivity of PVA increases due to water sorption [199], this polymer can be used as a capacitive-type sensing film for UHF and microwave sensor systems, as seen in Reference [200] by Amin et al and Reference [127] by Amin et al As with many of the polymers discussed in this section, PVA can be used as a standalone, sensitive coating, as seen in References [196,197] by Amin et al, along with the work of Chen and Kao [135]. Alternatively, PVA can be used as part of a composite sensing material, as seen in the work of Chatzandroulis et al [198], along with the work of Andreev et al [199] and Deshkulkarni et al [201].…”

Section: Overview Of Previously Used Rfid Sensor Materialsmentioning

confidence: 99%

A Review of Chipless Remote Sensing Solutions Based on RFID Technology

Gee

Anandarajah

Collins

2019

Sensors

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Chipless Radio Frequency Identification (RFID) has been used in a variety of remote sensing applications and is currently a hot research topic. To date, there have been a large number of chipless RFID tags developed in both academia and in industry that boast a large variation in design characteristics. This review paper sets out to discuss the various design aspects needed in a chipless RFID sensor. Such aspects include: (1) Addressing strategies to allow for unique identification of the tag, (2) Sensing mechanisms used to allow for impedance-based response signal modulation and (3) Sensing materials to introduce the desired impedance change when under the influence of the target stimulus. From the tabular comparison of the various sensing and addressing techniques, it is concluded that although many sensors provide adequate performance characteristics, more work is needed to ensure that this technology is capable/robust enough to operate in many of the applications it has been earmarked for.

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“…Recently, flexible humidity sensors with good electrical properties have become a central focus due to their lightweight, easy handling and can be attached to various complex parts. Polymer-based humidity sensors with an affinity for water molecules from hydrophilic functional groups are seen as the most feasible humidity sensors due to their high flexibility, low cost, and high mechanical stability [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…To encounter this, PANI is often used in the form of blends, composites and doped forms. Tungsten disulfide [19], titanium dioxide [20], silver [21], zinc oxide [22], nickel oxide [23], poly(vinyl alcohol) [11], chitin [24] etc have been used with PANI to tune the physical and chemical properties and to enhance the humidity sensing performance. On the other hand, surfactant and dyes including sodium lauryl sulfate (SLS) cetyltrimethylammonium bromide [25], dodecylbenzenesulfonic acid [26], triton X-100 [27], orange dye [28] etc., have been used as doping agents to enhance the electrical conductivity and tune the morphology of PANI.…”

Section: Introductionmentioning

confidence: 99%