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| Content Provider | IET Digital Library |
|---|---|
| Author | Mokhtarifar, Naser Goldschmidtboeing, Frank Woias, Peter |
| Abstract | Indium tin oxide (ITO) on polyethylene terephthalate (PET) substrate is characterised in terms of pH-sensitivity. Commercial ITO/PET sheet was cut in a shape of electrode and was connected to the gate-terminal of a metal–oxide–semiconductor field-effect transistor as the sensory part, creating an extended gate field-effect transistor (EGFET) pH-sensor. The quality of laser micromachining as well as the moulded ITO/PET electrode is investigated. The pH-sensitivity and linearity of the sensor signal are studied over time for a single hanging ITO/PET electrode. With the help of a constant-charge amplifier circuitry, the reference electrode, dipped in the measurement cell, is grounded. Therefore, the noise level, coupled into the sensor signal from environment, is decreased and also integration of the second sensor to the measurement cell becomes possible. The pH-measurement is carried out while EGFET pair, immersed into a buffer solution next to a pseudo-reference electrode, is working in differential mode to compensate for the high drift signal rate which is common for this type of sensors. As the result, a very low-cost EGFET-based pH-sensor is achieved based on commercially available products independent of costly cleanroom processes. |
| Starting Page | 1525 |
| Ending Page | 1530 |
| Page Count | 6 |
| Volume Number | 13 |
| e-ISSN | 17500443 |
| Issue Number | Issue 11, Nov (2018) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/mnl/13/11 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/mnl.2018.5240 |
| Journal | Micro & Nano Letters |
| Publisher Date | 2018-11-01 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Amplifiers Buffer Solution Chemical Analysis And Related Physical Method of Analysis Chemical Sensor Chemical Variables Measurement Commercial ITO-PET Sheet Constant-charge Amplifier Circuitry Differential PH-sensing EGFET PH-sensor Electrode Shape Extended Gate Field-effect Transistor PH-sensor Field-effect Transistor Based Sensor Gate-terminal General Fabrication Technique High Drift Signal Rate Indium Compound Indium Tin Oxide Coated PET InSnO Insulated Gate Field Effect Transistors Laser Beam Machining Laser Material Processing Laser Micromachining Quality Low-cost EGFET-based PH-sensor Measurement Cell Metal–oxide–semiconductor Field-effect Transistor Micromachining MOSFET Moulded ITO-PET Electrode Noise Level PH Measurement PH-measurement PH-sensitivity Polyethylene Terephthalate Substrate Polymer Film Pseudoreference Electrode Reference Electrode Sensor Signal Sheet Material Tin Compound |
| Content Type | Text |
| Resource Type | Article |
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