Customizing hydrothermal properties of inkjet printed sensitive films by functionalization of carbon nanotubes
Autor: | Ayda Bouhamed, Ammar Al-Hamry, Heinrich Lang, Dominique Miesel, P Frenzel, Reinhard R. Baumann, V Kamatchi, Tatiana Zubkova, Dhivakar Rajendran, Jose Roberto Bautista-Quijano, Olfa Kanoun, Rajarajan Ramalingame |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Sonication Infrared spectroscopy Bioengineering 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Hydrothermal circulation 0104 chemical sciences law.invention Thermogravimetry Microelectrode Chemical engineering Mechanics of Materials law Surface modification General Materials Science Electrical and Electronic Engineering 0210 nano-technology |
Zdroj: | Nanotechnology. 32:105708 |
ISSN: | 1361-6528 0957-4484 |
Popis: | Multiwalled carbon nanotubes (MWCNTs) are attractive materials for realizing sensors, owing to their high aspect ratio associated with excellent mechanical, electronic, and thermal properties. Moreover, their sensing properties can be tuned by introducing functional groups on their framework and adjusting the processing conditions. In this paper, we investigate the potential of functionalized CNTs for humidity and temperature sensing by optimization of the functionalization, the processing conditions and the printing conditions. The morphology of the differently functionalized MWCNTs is investigated by infrared spectroscopy (IR), scanning electron microscopy, thermogravimetry (TG) and TG-coupled mass-spectrometric studies. Using the functionalized MWCNTs, films were fabricated with different numbers of layers (4, 6, 8, 10 layers) via inkjet printing on a flexible polyimide substrate containing an interdigital microelectrode. The influence of hydrothermal effects was investigated. The sensitivity to humidity is higher for films prepared with MWCNTs functionalized with a high sonication amplitude and a bigger number of layers due to enhancements of hydrophilicity and water mobility. A higher sensitivity to temperature is achieved by a low sonication amplitude and a small number of layers. For the encapsulation of the temperature sensor against humidity, a Bectron layer is proposed, which reduces also the hysteresis effect. This study demonstrates the efficiency of carboxylic functionalized MWCNTs deposit by inkjet printing for realization of sensitive and cost-effective humidity and temperature sensors. It provides a real example for the interesting contribution of functionalization procedures to the sensing properties of MWCNTs films. |
Databáze: | OpenAIRE |
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