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Open AccessArticle

Amino Anthraquinone: Synthesis, Characterization, and Its Application as an Active Material in Environmental Sensors

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Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn Victoria 3122, Australia
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Department of Physics, Faculty of Physical and Numerical Sciences, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa 23200, Pakistan
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Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
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Department of Physics, Riphah International University, Islamabad 45210, Pakistan
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Department of Physics, Karakoram International University, Gilgit 15100, Pakistan
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Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn Victoria 3122, Australia
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Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
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Department of Electric, Electronics and System Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
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Author to whom correspondence should be addressed.
Materials 2020, 13(4), 960; https://doi.org/10.3390/ma13040960
Received: 22 November 2019 / Revised: 20 December 2019 / Accepted: 2 January 2020 / Published: 21 February 2020
This work reports synthesis, thin film characterizations, and study of an organic semiconductor 2-aminoanthraquinone (AAq) for humidity and temperature sensing applications. The morphological and phase studies of AAq thin films are carried out by scanning electron microscope (SEM), atomic force microscope (AFM), and X-ray diffraction (XRD) analysis. To study the sensing properties of AAq, a surface type Au/AAq/Au sensor is fabricated by thermally depositing a 60 nm layer of AAq at a pressure of ~10−5 mbar on a pre-patterned gold (Au) electrodes with inter-electrode gap of 45 µm. To measure sensing capability of the Au/AAq/Au device, the variations in its capacitance and resistance are studied as a function of humidity and temperature. The Au/AAq/Au device measures and exhibits a linear change in capacitance and resistance when relative humidity (%RH) and temperature are varied. The AAq is a hydrophobic material which makes it one of the best candidates to be used as an active material in humidity sensors; on the other hand, its high melting point (575 K) is another appealing property that enables it for its potential applications in temperature sensors. View Full-Text
Keywords: humidity sensor; temperature sensor; 2-aminoanthraquinone (AAq); organic semiconductor sensor; AFM humidity sensor; temperature sensor; 2-aminoanthraquinone (AAq); organic semiconductor sensor; AFM
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Ali, S.; Tahir, M.; Mehboob, N.; Wahab, F.; J. Langford, S.; Mohd Said, S.; R. Sarker, M.; Julai, S.; Hamid Md Ali, S. Amino Anthraquinone: Synthesis, Characterization, and Its Application as an Active Material in Environmental Sensors. Materials 2020, 13, 960.

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