A Nanowire based Field-Effect Humidity Sensor using an Inkjet Printable PEDOT:PSS Sensing Layer
Date Issued
2015
Date
2015
Author(s)
Yeh, Sou-Peng
Abstract
Humidity sensing has been a key functionality that is used in many different applications. It can be used to monitor the environment to facilitate and maintain the growth of several cultivations or micro-scale colonies of living organisms. The fundamental requirements of humidity sensors should be high stability and accuracy. Additionally, they should also be powered by minimal energy sources for applications that require such precision. In this work we introduce a humidity sensing system that combines a signal amplifying circuit with a humidity sensor. The sensor is built with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate(PEDOT:PSS) as the polymer that traps the water molecules, and N+ polysilicon nanowires as the conducting material. The polymer is inkjet-printed on the nanowire segment of the sensor. This setup is tested and proven to produce relatively stable responses after long periods of testing. The results also shows good selectivity among common gases such as N2, CO2, and other hazardous gases such as CO and NO2.
Subjects
humidity sensor
inkjet printing
nanowire
polysilicon
poly(3,4- ethylenedioxythiophene) polystyrene sulfonate(PEDOT:PSS)
Type
thesis
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ntu-104-R02943063-1.pdf
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