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Ultra-Sensitive and Fast Humidity Sensors Based on Direct Laser-Scribed Graphene Oxide/Carbon Nanotubes Composites

ORCID
0000-0003-0952-3134
Affiliation
Measurement and Sensor Technology, Department of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany;(T.L.);(A.A.);(S.N.);(A.B.);(S.W.)
Al-Hamry, Ammar;
ORCID
0000-0003-0173-7023
Affiliation
Measurement and Sensor Technology, Department of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany;(T.L.);(A.A.);(S.N.);(A.B.);(S.W.)
Lu, Tianqi;
Affiliation
Measurement and Sensor Technology, Department of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany;(T.L.);(A.A.);(S.N.);(A.B.);(S.W.)
Chen, Haoran;
Affiliation
Measurement and Sensor Technology, Department of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany;(T.L.);(A.A.);(S.N.);(A.B.);(S.W.)
Adiraju, Anurag;
ORCID
0000-0002-8936-9108
Affiliation
Measurement and Sensor Technology, Department of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany;(T.L.);(A.A.);(S.N.);(A.B.);(S.W.)
Nasraoui, Salem;
ORCID
0000-0002-1002-9160
Affiliation
Measurement and Sensor Technology, Department of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany;(T.L.);(A.A.);(S.N.);(A.B.);(S.W.)
Brahem, Amina;
ORCID
0000-0003-2443-376X
Affiliation
University of Belgrade—Faculty of Physical Chemistry, Studentski trg 12–16, 11158 Belgrade, Serbia;(D.B.-B.);(I.A.P.)
Bajuk-Bogdanović, Danica;
ORCID
0000-0002-7577-900X
Affiliation
Measurement and Sensor Technology, Department of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany;(T.L.);(A.A.);(S.N.);(A.B.);(S.W.)
Weheabby, Saddam;
ORCID
0000-0002-1000-9784
Affiliation
University of Belgrade—Faculty of Physical Chemistry, Studentski trg 12–16, 11158 Belgrade, Serbia;(D.B.-B.);(I.A.P.)
Pašti, Igor A.;
ORCID
0000-0002-7166-1266
Affiliation
Measurement and Sensor Technology, Department of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany;(T.L.);(A.A.);(S.N.);(A.B.);(S.W.)
Kanoun, Olfa

In this paper, the relative humidity sensor properties of graphene oxide (GO) and graphene oxide/multiwalled nanotubes (GO/MWNTs) composites have been investigated. Composite sensors were fabricated by direct laser scribing and characterized using UV-vis-NIR, Raman, Fourier transform infrared, and X-ray photoemission spectroscopies, electron scanning microscopy coupled with energy-dispersive X-ray analysis, and impedance spectroscopy (IS). These methods confirm the composite homogeneity and laser reduction of GO/MWNT with dominant GO characteristics, while ISresults analysis reveals the circuit model for rGO-GO-rGO structure and the effect of MWNT on the sensor properties. Although direct laser scribing of GO-based humidity sensor shows an outstanding response (|Δ Z |/| Z | up to 638,800%), a lack of stability and repeatability has been observed. GO/MWNT-based humidity sensors are more conductive than GO sensors and relatively less sensitive (|Δ Z |/| Z | = 163,000%). However, they are more stable in harsh humid conditions, repeatable, and reproducible even after several years of shelf-life. In addition, they have fast response/recovery times of 10.7 s and 9.3 s and an ultra-fast response time of 61 ms when abrupt humidification/dehumidification is applied by respiration. All carbon-based sensors’ overall properties confirm the advantage of introducing the GO/MWNT hybrid and laser direct writing to produce stable structures and sensors.

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Editor:
Scandurra, Antonino; Ruffino, Francesco; Battiato, Sergio
Published in:
Nanomaterials  
Vol. 13, No. 9 (26.04.2023)
Volume:
13
No.:
9
Date Issued:
26.04.2023
DOI:
10.3390/nano13091473
Language:
English
Type of Resource:
Text
Keywords:
laser direct writing; reduced graphene oxide; carbon nanotubes; nanocomposite; humidity sensor; impedance spectroscopy
DDC subject of DNB:
610 Medical sciences Medicine

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