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Intense pH Sensitivity Modulation in Carbon Nanotube-Based Field-Effect Transistor by Non-Covalent Polyfluorene

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Functionalized carbon nanotube field-effect transistors (f-CNTFETs) show significantly enhanced pH sensing capabilities compared to non-functionalized devices. This breakthrough offers a new state-of-the-art for pH sensors, though real-world application challenges remain.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensors

Background:

  • Carbon nanotube field-effect transistors (CNTFETs) are promising for sensing applications.
  • Functionalization of CNTFETs is explored to enhance their performance, particularly for pH sensing.
  • Existing CNTFET pH sensors have limitations in sensitivity and operational range.

Purpose of the Study:

  • To compare the pH sensing performance of non-functionalized CNTFETs (p-CNTFET) and CNTFETs functionalized with a polyfluorene polymer bearing urea moieties (f-CNTFET).
  • To evaluate the sensitivity and response of these devices in different buffer solutions.
  • To understand the mechanism behind the enhanced pH sensitivity in functionalized devices.

Main Methods:

  • Fabrication of electrolyte-gated, PMMA-passivated, 5 µm-channel FETs using inkjet-printed single-walled CNT.
  • Functionalization of CNTFETs with a conjugated polyfluorene polymer (FF-UR) containing urea-based moieties.
  • Measurement of drain current sensitivity to pH variations in phosphate-buffered saline (PBS) and borate buffer solutions (BBS) at a gate and drain voltage of -0.8 V.

Main Results:

  • Non-functionalized CNTFETs (p-CNTFETs) showed a linear pH response in PBS (pH 3-9) with 26%/pH unit sensitivity.
  • Functionalized CNTFETs (f-CNTFETs) exhibited a significantly higher sensitivity of 373%/pH unit in PBS (pH 7-9) and 96%/pH unit in BBS (pH 5-9).
  • The enhanced sensitivity in f-CNTFETs is attributed to interactions between the FF-UR functionalization and buffer ions, affecting electrolyte gating and surface charge.

Conclusions:

  • Functionalization with FF-UR polymer dramatically improves CNTFET pH sensing performance, exceeding the current state-of-the-art by over 10 times in BBS.
  • This study demonstrates the first significant improvement in CNTFET pH sensing using functionalization beyond carboxylate moieties.
  • Challenges remain in translating this high performance to real-world water matrices due to potential interference from competing species.