A1 Journal article (refereed)
Laser-induced tuning of graphene field-effect transistors for pH sensing (2023)

Lampinen, A., See, E., Emelianov, A., Myllyperkiö, P., Johansson, A., & Pettersson, M. (2023). Laser-induced tuning of graphene field-effect transistors for pH sensing. Physical Chemistry Chemical Physics, 25(15), 10778-10784. https://doi.org/10.1039/d3cp00359k

JYU authors or editors

Publication details

All authors or editors: Lampinen, Aku; See, Erich; Emelianov, Aleksei; Myllyperkiö, Pasi; Johansson, Andreas; Pettersson, Mika

Journal or series: Physical Chemistry Chemical Physics

ISSN: 1463-9076

eISSN: 1463-9084

Publication year: 2023

Publication date: 29/03/2023

Volume: 25

Issue number: 15

Pages range: 10778-10784

Publisher: Royal Society of Chemistry

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1039/d3cp00359k

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/86366

Abstract

Here we demonstrate, using pulsed femtosecond laser-induced two-photon oxidation (2PO), a novel method of locally tuning the sensitivity of solution gated graphene field-effect transistors (GFETs) without sacrificing the integrity of the carbon network of chemical vapor deposition (CVD) grown graphene. The achieved sensitivity with 2PO was (25 ± 2) mV pH−1 in BIS-TRIS propane HCl (BTPH) buffer solution, when the oxidation level corresponded to the Raman peak intensity ratio I(D)/I(G) of 3.58. Sensitivity of non-oxidized, residual PMMA contaminated GFETs was 20–22 mV pH−1. The sensitivity decreased initially by 2PO to (19 ± 2) mV pH−1 (I(D)/I(G) = 0.64), presumably due to PMMA residue removal by laser irradiation. 2PO results in local control of functionalization of the CVD-grown graphene with oxygen-containing chemical groups enhancing the performance of the GFET devices. The GFET devices were made HDMI compatible to enable easy coupling with external devices for enhancing their applicability.

Keywords: graphene; pH; acidity; measuring instruments (indicators); sensors; laser technology

Contributing organizations

Ministry reporting: Yes

VIRTA submission year: 2023

JUFO rating: 3