DEVELOPMENT OF HUMIDITY SENSOR USING SEMICONDUCTING ORGANIC POLYMER IN CELLULAR FORMS

  • Bancha Arthibenyakul ภาควิชาฟิสิกส์อุตสาหกรรมและอุปกรณ์การแพทย์ คณะวิทยาศาสตร์ประยุกต์ มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าพระนครเหนือ
  • Kittipong Tantisantisom Integrated Nanosystem Laboratory (INS), National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency, 111 Thailand Science Park, Pathum Thani, 12120
  • Paisan Khanchaitit Integrated Nanosystem Laboratory (INS), National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency, 111 Thailand Science Park, Pathum Thani, 12120
Keywords: humidity sensor, cellular form, PEDOT : PSS, melamine foam

Abstract

Humidity sensor was developed in cellular forms using semiconducting organic polymer. Poly (3,4-ethylenedioxythiophene) : polystyrene sulfonate (PEDOT:PSS) was the key material that played the important role in the humidity sensing. It was embedded in the structure of melamine foam by dip and dry process for thin film formation. In order to distribute PEDOT : PSS film in the cellular structure, LF-221 surfactant was added in the PEDOT : PSS solution and the concentration of surfactant was varied. The impedance and capacitance responses were observed in different relative humidity, and the results revealed that the relative humidity response of the obtained sensor depended on the concentration of surfactant. The appropriate concentration should be in the range of 0.1% - 1%. Moreover, the results showed that the frequency of electrical measurement affected the dynamic switch behavior for humidity sensing. The frequency of 1 kHz
is the best values for electrical measurement. The results of electrical measurement indicate that the obtained sensor from PEDOT:PSS in a cellular form has potential to be a humidity sensor in the capacitive mode more than the resistive mode due to the better in humidity response and dynamic switch behavior for humidity sensing

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Published
2018-03-08
Section
บทความวิจัย (Research Article)