Depression of a capacitive-type humidity sensor’s drift by introducing a cross-linked structure in the sensing polymer

Matsuguchi, Masanobu; Yoshida, Makoto; Kuroiwa, Takashi; Ogura, Tsutomu

doi:10.1016/j.snb.2003.12.061

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…Figure 6 shows that sensor AB presented in 2010 values similar to the outside RH , but in 2008 the recorded values were similar to measurements at the cornice. The trajectory of AB with respect to cornice sensors in 2010, which are not parallel, discards a pattern caused by an aging drift of sensor AB [ 27 ]. Consequently, it was discarded for the statistical analysis.…”

Section: Resultsmentioning

confidence: 99%

Long-Term Monitoring of Fresco Paintings in the Cathedral of Valencia (Spain) Through Humidity and Temperature Sensors in Various Locations for Preventive Conservation

Zarzo

Fernández-Navajas

García-Diego

2011

Sensors

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We describe the performance of a microclimate monitoring system that was implemented for the preventive conservation of the Renaissance frescoes in the apse vault of the Cathedral of Valencia, that were restored in 2006. This system comprises 29 relative humidity (RH) and temperature sensors: 10 of them inserted into the plaster layer supporting the fresco paintings, 10 sensors in the walls close to the frescoes and nine sensors measuring the indoor microclimate at different points of the vault. Principal component analysis was applied to RH data recorded in 2007. The analysis was repeated with data collected in 2008 and 2010. The resulting loading plots revealed that the similarities and dissimilarities among sensors were approximately maintained along the three years. A physical interpretation was provided for the first and second principal components. Interestingly, sensors recording the highest RH values correspond to zones where humidity problems are causing formation of efflorescence. Recorded data of RH and temperature are discussed according to Italian Standard UNI 10829 (1999).

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Section: Resultsmentioning

confidence: 99%

Long-Term Monitoring of Fresco Paintings in the Cathedral of Valencia (Spain) Through Humidity and Temperature Sensors in Various Locations for Preventive Conservation

Zarzo

Fernández-Navajas

García-Diego

2011

Sensors

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“…Therefore, monitoring of the soil moisture is necessary for effective farming, especially on smart farms. However, the measurement methods of the soil moisture differ greatly from the conventional humidity measurement since water mixed with relatively large soil grains is in liquid phase and sensing water molecules in soil becomes more difficult than sensing gas phase water molecules in air [9,10]. Time-domain reflectometry or frequency-domain reflectometry (FDR) sensors, which detect change in water contents with variation of the permittivity, are conventionally known as most accurate sensors.…”

Section: Introductionmentioning

confidence: 99%

Controllable liquid water sensitivity of polymer-encapsulated oxide thin-film transistors

Yu¹,

Kim²,

Park³

et al. 2020

Semicond. Sci. Technol.

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We demonstrated the controllable liquid water sensitivity of polymer-encapsulated oxide-based thin-film transistors (OxTFTs). The oxide active channels of the fabricated TFTs were utilized as water-sensitive layers. The OxTFTs were encapsulated with several polymers as water controlling layers (WCLs) to investigate and optimize the water sensitivity. It was found that the surface energy and porosity of the WCL significantly affect the water-dependent electrical characteristics of the OxTFTs. By employing poly(vinylidene-trifluoroethylene) (P(VDF-TrFE)) as a WCL and annealing the chosen polymer properly, we achieved a continuous shift of the threshold voltage even after several hours of direct exposure to the liquid phase of water which is crucial for sensor properties of the OxTFTs. The device using P(VDF-TrFE) as the WCL exhibits long-term stable detection characteristics and repeatability, demonstrating its applicability as a low-cost soil moisture sensor.

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“…When water vapor is adsorbed on humidity-sensitive films, the resistivity and resistance of the films can be changed [1]. However, traditional humidity-sensitive materials have some problems like poor stability, severe humidity hysteresis, poor resistance to high humidity, slow response and recovery time, etc [2][3][4]. In 2004, Geim and Konstantin, from the University of Manchester [5], got a single layer of graphene for the first time.…”

Section: Introductionmentioning

confidence: 99%

The preparation of graphene/polyethylene oxide/sodium dodecyl sulfate composite humidity sensor via electrohydrodynamic direct-writing

Wang

Mei

Cao

et al. 2019

J. Phys. D: Appl. Phys.

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Continuous accurate deposition of composites can be achieved by electrohydrodynamic directwriting, but the eddy flow with the Weissenberg effect may affect stable jet, which is important in electrohydrodynamic direct-writing. So electrohydrodynamic direct-writing of micro-scale graphene/polyethylene oxide/sodium dodecyl sulfate composite (the pumping and preparation of graphene composites based on the Weissenberg effect) is studied for the first time. This paper explores the effects on the morphology of graphene composite films such as voltage and collection distance. In addition, the composite is firstly used in a resistance-based humidity sensor. It is found that the composite films are very sensitive to humidity when its width is less than 200 µm due to its porous structure and high specific surface area. When the width of the composite films is about 100 µm, its resistance decreases rapidly as the humidity increases from 63% RH to 100% RH (the response time is less than 2.5 s).

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Depression of a capacitive-type humidity sensor’s drift by introducing a cross-linked structure in the sensing polymer

Cited by 12 publications

References 12 publications

Long-Term Monitoring of Fresco Paintings in the Cathedral of Valencia (Spain) Through Humidity and Temperature Sensors in Various Locations for Preventive Conservation

Long-Term Monitoring of Fresco Paintings in the Cathedral of Valencia (Spain) Through Humidity and Temperature Sensors in Various Locations for Preventive Conservation

Controllable liquid water sensitivity of polymer-encapsulated oxide thin-film transistors

The preparation of graphene/polyethylene oxide/sodium dodecyl sulfate composite humidity sensor via electrohydrodynamic direct-writing

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