A Spray Processed Harsh Environment Humidity Sensor for Detecting Relative Humidity in Microfluidic Gas Flows

Marcel Knoll; Christina Offenzeller; Bernhard Jakoby; Wolfgang Hilber

A Spray Processed Harsh Environment Humidity Sensor for Detecting Relative Humidity in Microfluidic Gas Flows

Marcel Knoll
, Christina Offenzeller
, Bernhard Jakoby
, Wolfgang Hilber

Institute of Microelectronics and Microsensors

Research output: Chapter in Book/Report/Conference proceeding › Conference proceedings › peer-review

Abstract

Four different custom made paints based on different compositions of carbon black (either pure or in a polyamide-imide matrix) were used to spray process a resistive type humidity sensor. The polyamide-imide composite resistors show good mechanical, chemical and high temperature stability up to 250 °C. Characterization of the resistors was done in a climatic chamber where the relative humidity was ramped from 28 to 90% and the temperature from 25 to 85 °C. The highest relative change in resistivity observed was 0.11 at a temperature of 85 °C. All tested samples showed an increase in humidity sensitivity with increasing temperature. Subsequently the temperature characteristic of the resistors was recorded up to 250 °C, where two of the tested paints showed a conversion from negative to positive temperature coefficient.

Original language	English
Title of host publication	Proceedings of the 5th European Conference on Microfluidics
Number of pages	4
Publication status	Published - Feb 2018

Fields of science

202021 Industrial electronics
202036 Sensor systems
202 Electrical Engineering, Electronics, Information Engineering
202027 Mechatronics
202028 Microelectronics

JKU Focus areas

Mechatronics and Information Processing

Cite this

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title = "A Spray Processed Harsh Environment Humidity Sensor for Detecting Relative Humidity in Microfluidic Gas Flows",

abstract = "Four different custom made paints based on different compositions of carbon black (either pure or in a polyamide-imide matrix) were used to spray process a resistive type humidity sensor. The polyamide-imide composite resistors show good mechanical, chemical and high temperature stability up to 250 °C. Characterization of the resistors was done in a climatic chamber where the relative humidity was ramped from 28 to 90\% and the temperature from 25 to 85 °C. The highest relative change in resistivity observed was 0.11 at a temperature of 85 °C. All tested samples showed an increase in humidity sensitivity with increasing temperature. Subsequently the temperature characteristic of the resistors was recorded up to 250 °C, where two of the tested paints showed a conversion from negative to positive temperature coefficient.",

author = "Marcel Knoll and Christina Offenzeller and Bernhard Jakoby and Wolfgang Hilber",

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language = "English",

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T1 - A Spray Processed Harsh Environment Humidity Sensor for Detecting Relative Humidity in Microfluidic Gas Flows

AU - Knoll, Marcel

AU - Offenzeller, Christina

AU - Jakoby, Bernhard

AU - Hilber, Wolfgang

PY - 2018/2

Y1 - 2018/2

N2 - Four different custom made paints based on different compositions of carbon black (either pure or in a polyamide-imide matrix) were used to spray process a resistive type humidity sensor. The polyamide-imide composite resistors show good mechanical, chemical and high temperature stability up to 250 °C. Characterization of the resistors was done in a climatic chamber where the relative humidity was ramped from 28 to 90% and the temperature from 25 to 85 °C. The highest relative change in resistivity observed was 0.11 at a temperature of 85 °C. All tested samples showed an increase in humidity sensitivity with increasing temperature. Subsequently the temperature characteristic of the resistors was recorded up to 250 °C, where two of the tested paints showed a conversion from negative to positive temperature coefficient.

AB - Four different custom made paints based on different compositions of carbon black (either pure or in a polyamide-imide matrix) were used to spray process a resistive type humidity sensor. The polyamide-imide composite resistors show good mechanical, chemical and high temperature stability up to 250 °C. Characterization of the resistors was done in a climatic chamber where the relative humidity was ramped from 28 to 90% and the temperature from 25 to 85 °C. The highest relative change in resistivity observed was 0.11 at a temperature of 85 °C. All tested samples showed an increase in humidity sensitivity with increasing temperature. Subsequently the temperature characteristic of the resistors was recorded up to 250 °C, where two of the tested paints showed a conversion from negative to positive temperature coefficient.

M3 - Conference proceedings

SN - 979-10-93567-17-4

BT - Proceedings of the 5th European Conference on Microfluidics

ER -