Graphene Oxide and Polymer Humidity Micro-Sensors Prepared by Carbon Beam Writing

0570625 - ÚJF 2024 RIV CH eng J - Journal Article
Malinský, Petr - Romanenko, Oleksandr V. - Havránek, Vladimír - Cutroneo, Mariapompea - Novák, Josef - Štěpanovská, Eva - Mikšová, Romana - Marvan, P. - Mazánek, V. - Sofer, Z. - Macková, Anna
Graphene Oxide and Polymer Humidity Micro-Sensors Prepared by Carbon Beam Writing.
Polymers. Roč. 15, č. 5 (2023), č. článku 1066. E-ISSN 2073-4360
R&D Projects: GA MŠMT EF16_013/0001812; GA ČR(CZ) GA22-10536S
Institutional support: RVO:61389005
Keywords : carbon ion micro-beam writting * graphene oxide * humidity sensors * polymers
OECD category: Polymer science
Impact factor: 5, year: 2022
Method of publishing: Open access
https://doi.org/10.3390/polym15051066

In this study, novel flexible micro-scale humidity sensors were directly fabricated in graphene oxide (GO) and polyimide (PI) using ion beam writing without any further modifications, and then successfully tested in an atmospheric chamber. Two low fluences (3.75 x 10(14) cm(-2) and 5.625 x 10(14) cm(-2)) of carbon ions with an energy of 5 MeV were used, and structural changes in the irradiated materials were expected. The shape and structure of prepared micro-sensors were studied using scanning electron microscopy (SEM). The structural and compositional changes in the irradiated area were characterized using micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Rutherford back-scattering spectroscopy (RBS), energy-dispersive X-ray spectroscopy (EDS), and elastic recoil detection analysis (ERDA) spectroscopy. The sensing performance was tested at a relative humidity (RH) ranging from 5% to 60%, where the electrical conductivity of PI varied by three orders of magnitude, and the electrical capacitance of GO varied in the order of pico-farads. In addition, the PI sensor has proven long-term sensing stability in air. We demonstrated a novel method of ion micro-beam writing to prepare flexible micro-sensors that function over a wide range of humidity and have good sensitivity and great potential for widespread applications.
Permanent Link: https://hdl.handle.net/11104/0341929