Analyte selective response in solution-deposited tetrabenzoporphyrin thin-film field-effect transistor sensors
| Autor: | Andrew C. Kummel, James E. Royer, William C. Trogler, Jerzy Kanicki, Sangyeob Lee, Charlene Chen, Byungmin Ahn |
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| Rok vydání: | 2011 |
| Předmět: |
Analyte
Materials science business.industry Metals and Alloys Analytical chemistry Substrate (electronics) Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Organic semiconductor chemistry.chemical_compound Semiconductor chemistry Thin-film transistor Materials Chemistry Phthalocyanine Field-effect transistor Electrical and Electronic Engineering Thin film business Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 158:333-339 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2011.06.030 |
| Popis: | Organic thin film transistor (OTFT) chemical sensors rely on the specific electronic structure of the organic semiconductor (OSC) film for determining sensor stability and response to analytes. The delocalized electronic structure is influenced not only by the OSC molecular structure, but also the solid state packing and film morphology. Phthalocyanine (H 2 Pc) and tetrabenzoporphyrin (H 2 TBP) have similar molecular structures but different film microstructures when H 2 Pc is vacuum deposited and H 2 TBP is solution deposited. The difference in electronic structures is evidenced by the different mobilities of H 2 TBP and H 2 Pc OTFTs. H 2 Pc has a maximum mobility of 8.6 × 10 −4 cm 2 V −1 s −1 when the substrate is held at 250 °C during deposition and a mobility of 4.8 × 10 −5 cm 2 V −1 s −1 when the substrate is held at 25 °C during deposition. Solution deposited H 2 TBP films have a mobility of 5.3 × 10 −3 cm 2 V −1 s −1 , which is consistent with better long-range order and intermolecular coupling within the H 2 TBP films compared to the H 2 Pc films. Solution deposited H 2 TBP also exhibits a textured film morphology with large grains and an RMS roughness 3–5 times larger than H 2 Pc films with similar thicknesses. Despite these differences, OTFT sensors fabricated from H 2 TBP and H 2 Pc exhibit nearly identical analyte sensitivity and analyte response kinetics. The results suggest that while the interactions between molecules in the solid state determine conductivity, localized interactions between the analyte and the molecular binding site dominate analyte binding and determine sensor response. |
| Databáze: | OpenAIRE |
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