2017
DOI: 10.1088/2058-8585/aa5eeb
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Paper-based printed impedance sensors for water sorption and humidity analysis

Abstract: The hygroscopic nature of cellulose-based materials poses a challenge in utilising paper for printed electronics. Adsorbed moisture strongly modulates the conductive and dielectric properties of paper. While affecting the function of printed electronic elements, this behaviour is beneficial for low-cost humidity sensing. Here we describe a simple, sensitive paper-based sensor with a pair of inkjet-printed interdigitated electrodes for analysing water sorption of cellulose over a wide range of relative humidity… Show more

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Cited by 27 publications
(18 citation statements)
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“…Many of them are capacitive with a quite linear response in RH but there are also resistive sensors. The materials normally used are paper 32 , polyimide 33 (both materials serve as sensing layer and substrate at the same time), cellulose acetate butyrate (CAB) 34 or carbon nanotubes (CNTs) 35 . But they cannot be utilized as actuators because no abrupt change in their response occurs at any value of moisture content contrary to the here described device whose behavior varies from capacitive to resistive in less than 5%RH.…”
Section: Resultsmentioning
confidence: 99%
“…Many of them are capacitive with a quite linear response in RH but there are also resistive sensors. The materials normally used are paper 32 , polyimide 33 (both materials serve as sensing layer and substrate at the same time), cellulose acetate butyrate (CAB) 34 or carbon nanotubes (CNTs) 35 . But they cannot be utilized as actuators because no abrupt change in their response occurs at any value of moisture content contrary to the here described device whose behavior varies from capacitive to resistive in less than 5%RH.…”
Section: Resultsmentioning
confidence: 99%
“…The findings indicate that the surface structure could also influence the sensors’ sensing performance because CNF was more porous and less crystalline than TOCNF/G, as confirmed by SEM and XRD analysis. Although there is no definitive answer to the gas sensing mechanism of nanocellulose, our proposed mechanism can be supported by a similar consensus on studying a thin film of water in the interconnected network of cellulose that reacts with the gas molecules modulates cellulose conductivity [ 2 , 4 , 5 ].…”
Section: Resultsmentioning
confidence: 57%
“…Cellulose can be modified into different structures by chemical methods, and these modified forms have fascinating applications in flexible and disposable sensors [ 2 ]. Cellulose is porous, and it has a hygroscopic network consisting of intertwined fibers in which hydroxyl groups exist on its molecular chains [ 4 ]. Dry cellulose paper contains around 5% moisture by weight at 50% relative humidity [ 5 ].…”
Section: Introductionmentioning
confidence: 99%
“…In recent years, printed paper electronics have gained attention in various applications, like electrochemical sensors, energy storage devices, solar cells, and radiofrequency identification tags [1][2][3][4][5][6][7][8][9]. Paper-based inkjet-printed flexible electronic circuits with costeffective recyclability, and ecological features, are an alternative to the ongoing current electronic devices [10][11][12].…”
Section: Introductionmentioning
confidence: 99%