The effect of hydrophobin protein on conductive properties of carbon nanotube field-effect transistors: First study on sensing mechanism

Peerapong Yotprayoonsak, Géza R. Szilvay, Päivi Laaksonen, Markus B. Linder, Markus Ahlskog

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Hydrophobin is a surface active protein having both hydrophobic and hydrophilic functional domains which has previously been used for functionalization and solubilization of graphene and carbon nanotubes. In this work, field-effect transistors based on single nanotubes have been employed for electronic detection of hydrophobin protein in phosphate buffer solution. Individual nanotubes, single- and multiwalled, are characterized by atomic force microscopy after being immersed in protein solution, showing a relatively dense coverage with hydrophobin. We have studied aspects such as nanotube length (0.3-1.2 μm) and the hysteresis effect in the gate voltage dependent conduction. When measured in ambient condition after the exposure to hydrophobin, the resistance increase has a strong dependence on the nanotube length, which we ascribe to mobility degradation and localization effects. The change could be exceptionally large when measured in-situ in solution and at suitable gate voltage conditions, which is shown to relate to the different mechanism behind the hysteresis effect.

Original languageEnglish
Pages (from-to)2079-2087
Number of pages9
JournalJournal of Nanoscience and Nanotechnology
Volume15
Issue number3
DOIs
Publication statusPublished - 1 Jan 2015
MoE publication typeA1 Journal article-refereed

Keywords

  • Anderson localization
  • Biosensor
  • Carbon nanotube
  • Field-effect transistor
  • Hydrophobin
  • Protein

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