Enhanced sensitivity of an organic field-effect transistor pH sensor using a fatty acid Langmuir–Blodgett film
✍ Scribed by Supachai Ritjareonwattu; Youngjun Yun; Christopher Pearson; Michael C. Petty
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 347 KB
- Volume
- 11
- Category
- Article
- ISSN
- 1566-1199
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✦ Synopsis
An ion-sensitive organic field-effect transistor (ISOFET) has been fabricated by using poly(3-hexylthiophene) as the semiconductor and polymethylmethacrylate as the gate insulator. With the gate metallization replaced by an Ag/AgCl reference electrode, and following suitable encapsulation, the ISOFETs exhibit transistor behavior in an aqueous environment. Moreover, the devices are shown to respond to changes in pH of the solution. A significant increase in the sensitivity of the ISOFET to H + ions was found by depositing a Langmuir-Blodgett film of arachidic acid on top of the gate insulator.