Humidity Sensing Properties of Paper Substrates and Their Passivation with ZnO Nanoparticles for Sensor Applications

Niarchos, G.; Dubourg, Georges; Afroudakis, Georgios; Georgopoulos, M.; Tsouti, V.; Makarona, Eleni; Crnojević‐Bengin, Vesna; Tsamis, C.

doi:10.3390/s17030516

Cited by 51 publications

(27 citation statements)

References 35 publications

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“…Our imperceptible TFTs have superior linearity against humidity conditions at a gate voltage of 1V. Many researchers have studied resistive-type humidity sensors based on metal oxide with various structures, such as thin-film [34,35,36], nanoparticles [37], composites [38] and nanocrystals [39]. The sensitivity of resistive-type humidity sensors is mainly below 10 3 .…”

Section: Resultsmentioning

confidence: 99%

An All Oxide-Based Imperceptible Thin-Film Transistor with Humidity Sensing Properties

et al. 2017

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We have examined the effects of oxygen content and thickness in sputtered InSnO (ITO) electrodes, especially for the application of imperceptible amorphous-InGaZnO (a-IGZO) thin-film transistors (TFTs) in humidity sensors. The imperceptible a-IGZO TFT with 50-nm ITO electrodes deposited at Ar:O2 = 29:0.3 exhibited good electrical performances with Vth of −0.23 V, SS of 0.34 V/dec, µFE of 7.86 cm2/V∙s, on/off ratio of 8.8 × 107, and has no degradation for bending stress up to a 3.5-mm curvature. The imperceptible oxide TFT sensors showed the highest sensitivity for the low and wide gate bias of −1~2 V under a wide range of relative humidity (40–90%) at drain voltage 1 V, resulting in low power consumption by the sensors. Exposure to water vapor led to a negative shift in the threshold voltage (or current enhancement), and an increase in relative humidity induced continuous threshold voltage shift. In particular, compared to conventional resistor-type sensors, the imperceptible oxide TFT sensors exhibited extremely high sensitivity from a current amplification of >103.

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Section: Resultsmentioning

confidence: 99%

An All Oxide-Based Imperceptible Thin-Film Transistor with Humidity Sensing Properties

et al. 2017

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“…This powerful technique used for the micromachining of microdevices consists of the creation of an effective heat zone by a focused laser beam, which induces a localized physical state transition allowing the ablation materials [ 34 ]. In order to obtain micro-scale and well-resolved electrodes, the laser ablation process was optimized as proposed in [ 35 , 36 ]. First, the pulse overlapping was adjusted by using the maximum available frequency of 65 kHz and a low raster speed of 80 mm/s in order to achieve a continuous ablation line without damaging the substrate by thermal accumulation.…”

Section: Methodsmentioning

confidence: 99%

“…The humidity sensing properties of the fabricated sensors were investigated at room temperature (25 °C) by using an indigenously custom-designed humidity setup as described in [ 36 ]. The sensor to be analyzed was placed inside a sealed Teflon chamber, along with a reference sensor (Hanna instrument) that was used to monitor in real time the temperature and relative humidity (RH) inside the chamber.…”

Section: Methodsmentioning

confidence: 99%

Fabrication and Characterization of Flexible and Miniaturized Humidity Sensors Using Screen-Printed TiO2 Nanoparticles as Sensitive Layer

Dubourg

Segkos

Katona

et al. 2017

Sensors

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This paper describes the fabrication and the characterization of an original example of a miniaturized resistive-type humidity sensor, printed on flexible substrate in a large-scale manner. The fabrication process involves laser ablation for the design of interdigitated electrodes on PET (Poly-Ethylene Terephthalate) substrate and a screen-printing process for the deposition of the sensitive material, which is based on TiO2 nanoparticles. The laser ablation process was carefully optimized to obtain micro-scale and well-resolved electrodes on PET substrate. A functional paste based on cellulose was prepared in order to allow the precise screen-printing of the TiO2 nanoparticles as sensing material on the top of the electrodes. The current against voltage (I–V) characteristic of the sensor showed good linearity and potential for low-power operation. The results of a humidity-sensing investigation and mechanical testing showed that the fabricated miniaturized sensors have excellent mechanical stability, sensing characteristics, good repeatability, and relatively fast response/recovery times operating at room temperature.

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“…From the dynamic response behaviour, presented in Fig. 12, it can be easily confirmed that for lower humidity levels sensor has relatively modest response, which is expected for ZnO nanoparticles [19]. For extremely high humidity conditions (RH = 90%) sensor response becomes drastic, most probably because of the several layers of physisorbed water on the surface of nanoparticles.…”

Section: Resultsmentioning

confidence: 58%

Preparation of TiO2 and ZnO dispersions for inkjet printing of flexible sensing devices

Omerović

Radović

Savić

et al. 2018

PAC

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Research presented in this article focuses on the preparation of functional dispersions for inkjet printing of nanoparticles as sensitive layers. The stable suspensions of MO x (M = Ti, Zn) were prepared using gum arabic (GA) and Solsperse ® 40000 (SO) as dispersants. A special attention was paid to the monitoring of particle size evolution during the planetary ball milling of dispersions, so that optimum ratio between milling time and particle size can be determined. After adjusting the printing parameters, prepared inks were printed on the flexible PET substrate with interdigitated electrodes (IDE). Films printed with TiO 2 ink stabilized by GA exhibited highly cracked surface which resulted in low current values, whereas ZnO ink stabilized by SO yielded crack-free surface and much higher current values. All investigated samples showed linear current behaviour in the range from-5 to 5 V, indicating formation of ohmic contacts between electrodes and nanoparticles, but ZnO ink produced the highest current values. Gas sensing properties, tested at room temperature at several humidity levels and for different types of alcohols, revealed that printed sensor exhibits modest sensitivity for low humidity levels and slightly higher affinity towards methanol gas. Photo sensitivity measurement showed very high photocurrent values with strong potential for optoelectronic applications.

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Humidity Sensing Properties of Paper Substrates and Their Passivation with ZnO Nanoparticles for Sensor Applications

Cited by 51 publications

References 35 publications

An All Oxide-Based Imperceptible Thin-Film Transistor with Humidity Sensing Properties

An All Oxide-Based Imperceptible Thin-Film Transistor with Humidity Sensing Properties

Fabrication and Characterization of Flexible and Miniaturized Humidity Sensors Using Screen-Printed TiO2 Nanoparticles as Sensitive Layer

Preparation of TiO2 and ZnO dispersions for inkjet printing of flexible sensing devices

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