Publication

Inkjet printing on paper for the realization of humidity and temperature sensors

Nico de Rooij, Jérôme Courbat
2011
Conference Papers

Abstract

We report on inkjet printing of silver nanoparticles on paper for the design of resistive temperature and capacitive humidity sensors. Temperature and humidity have shown to have an influence on the electrical and mechanical properties of the Ag printed structures on paper. The passivation of the paper substrate and the Ag structures with parylene was investigated to reduce these effects and improve the stability of the structures. The lines were printed with an average thickness of 0.8 μm and a resistivity of 30 μΩ•cm. The Ag thermometer coated with parylene showed a good linearity with a TCR of 0.0011°C-1, while the capacitive humidity sensor exhibited an exponential response. This study foresees the possibility of using paper as substrate with inkjet printing of materials for the design of low-cost environmental sensors.

Official source

https://infoscience.epfl.ch/entities/publication/a1d00e30-3b81-41d6-8d9f-1028ba08148c

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Nico de Rooij, Jérôme Courbat
2011
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a1d00e30-3b81-41d6-8d9f-1028ba08148c

About this result

Related concepts (32)

Hygrometer

A hygrometer is an instrument which measures the humidity of air or some other gas: that is, how much water vapor it contains. Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass and mechanical or electrical changes in a substance as moisture is absorbed. By calibration and calculation, these measured quantities can lead to a measurement of humidity.

Sensor

A sensor is a device that produces an output signal for the purpose of sensing a physical phenomenon. In the broadest definition, a sensor is a device, module, machine, or subsystem that detects events or changes in its environment and sends the information to other electronics, frequently a computer processor. Sensors are used in everyday objects such as touch-sensitive elevator buttons (tactile sensor) and lamps which dim or brighten by touching the base, and in innumerable applications of which most people are never aware.

Humidity

Humidity is the concentration of water vapor present in the air. Water vapor, the gaseous state of water, is generally invisible to the human eye. Humidity indicates the likelihood for precipitation, dew, or fog to be present. Humidity depends on the temperature and pressure of the system of interest. The same amount of water vapor results in higher relative humidity in cool air than warm air. A related parameter is the dew point. The amount of water vapor needed to achieve saturation increases as the temperature increases.

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Inkjet printing on paper for the realization of humidity and temperature sensors

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