Journal
ACS Applied Materials & Interfaces
Volume 8, Issue 46, Pages 31783-31790Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b06952
Keywords
pentacene; EGOFET; capacitive coupling; biosensors; bioelectronics
Funding
- EU [280772]
- Implantable Organic Nanoelectronics (I-ONE-FP7)
- Engineering and Physical Sciences Research Council [EP/N02673X/1]
- University di Modena e Reggio Emilia
- EPSRC [EP/N02673X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/N02673X/1] Funding Source: researchfish
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Electrolyte-gated organic field-effect transistors (EGOFETs), based on ultrathin pentacene films on quartz, were operated with electrolyte solutions whose pH was systematically changed. Transistor parameters exhibit nonmonotonic variation versus pH, which cannot be accounted for by capacitive coupling through the Debye-Helmholtz layer. The data were fitted with an analytical model of the accumulated charge in the EGOFET, where Langmuir adsorption was introduced to describe the pH dependent charge buildup at the quartz surface. The model provides an excellent fit to the threshold voltage and transfer characteristics as a function of the pH, which demonstrates that quartz acts as a second gate controlled by pH and is mostly effective from neutral to alkaline pH. The effective capacitance of the device is always greater than the capacitance of the electrolyte, thus highlighting the role of the substrate as an important active element for amplification of the transistor response.
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