Chitin–polyaniline blend as humidity sensor

Ramaprasad, A.T.; Rao, Vijayalakshmi

doi:10.1016/j.snb.2010.05.044

Cited by 96 publications

(50 citation statements)

References 20 publications

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“…As such, cellulose is a good candidate due to its natural abundance. Indeed, several studies have investigated blends of cellulose with electron conductive molecules/polymers, such as carbon nanotubes, graphene, polyaniline, and polypyrrole motivated by the development of conductive paper for “green electronics.” Chitosan and chitin have also been used as templates for the formation of electron conducting polymers upon blending with polyaniline, carbon nanotubes, or graphene . The strategy of using carbon nanotubes and graphene for enhanced conductance across the biopolymer can be considered as an intermediate between strategies (2) and (3) in Figure , since they are not organic polymers, but have considerably larger molecular weights than molecular dopants.…”

Section: Biomolecular Electronic Materials At the Macroscalementioning

confidence: 99%

Macroscale Biomolecular Electronics and Ionics

2018

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www.advmat.de www.advancedsciencenews.com modern semiconductor-based electronic processing. The melanin story is also an archetype of the more recent "DNA-debate" and questions as to whether proteins, lipids, polysaccharides, etc., can intrinsically sustain electronic conduction and hence ET in the solid state. [13,31,32,41] That said, it is now appropriate and timely to introduce the basic concepts of ionic conduction.

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Section: Biomolecular Electronic Materials At the Macroscalementioning

confidence: 99%

Macroscale Biomolecular Electronics and Ionics

2018

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“…As humidity increases, polymer chain uncurls and becomes aligned by absorbing water molecules paving way for faster hopping of charge carriers, resulting in increased sensing response of the composite [21,35]. (ii) Porosity of the polymers as revealed by SEM studies may facilitate absorption of water molecules as RH increases causing a decrease in the impedance of the composite [13].…”

Section: Humidity Sensing Response Studiesmentioning

confidence: 99%

“…With the advancement of moisture-sensitive technologies and the increasing awareness for quality of life issues, humidity sensing has gained in importance in various areas like medicine, agriculture and electronic industries [13]. With the rapid advances in technology, increasing efficiency, reducing cost, reliability and miniaturization for fabrication of sensors are the major concerns in any research.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline-Titanium dioxide composite as humidity sensor at room temperature

Kotresh¹,

Ravikiran²,

Raj³

et al. 2016

Nanosystems: Phys. Chem. Math.

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In the present work, Polyaniline (PANI) and Polyaniline-Titanium dioxide (PANI-TiO 2 ) composite have been synthesized separately by chemical polymerization of aniline without/with TiO 2 . Characteristic absorption bands of PANI and TiO 2 in the composite were confirmed by FT-IR studies, indicating the interaction of PANI with TiO 2 . Comparative study of XRD patterns of PANI and the composite confirmed superficial deposition of PANI on TiO 2 and the average size of the composite particle was found to be 25 nm. The aggregated granular porous morphology of the composite was confirmed by its SEM image. The composite's sensing response to humidity at room temperature was tested and was found to be 84.21 % in the range 25 % -95 % RH. The response and recovery time of the composite at 95 % RH were measured to be 60s and 100s respectively and its sensing stability over a period of one month was also confirmed.

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“…Despite large interest in the potential applications of conducting polymer as gas sensors, a detailed molecular picture of the sensing mechanism of PANI (and more in general ICP) based devices is still under debate [5,6,16]. For example though importance of humidity in the PANI sensing mechanism [5], molecular understanding of response of PANI to humidity is not well established and several different mechanisms have been proposed: polymer swelling, increase in the interchain electron transfer and enhancement of dopant ions mobility [17,18]. Last but not least, there is no commonly accepted model for the charge transport in ICP [19].…”

Section: Introductionmentioning

confidence: 99%