Study on Semiconductor Properties of Acetylide-Thiourea Fabricated onto Interdigitated Electrodes (Ides) Platform Towards Application In Gas Sensing Technology

Abstract

In the past few decades, the unique properties of acetylide and thiourea moieties individually have attracted great attention from researchers in various fields to be developed in numerous applications in advanced materials technology, especially as an active layer in gas sensing devices. The molecular systems of acetylide and thiourea provide a wide range of electronic properties as they possess rigid π-systems in their designated structures. In this study, a derivative of acetylide-thiourea featuring N- (4[4-aminophenyl] ethynyl benzonitrile)-N'-(4-ethyl benzoyl) thiourea (TCN) has been synthesised with the general formula of ArC(O)NHC(S)NHC≡C)Ar adopted the system of D-π-A for the significant development of conductive materials. The derivative consists of donating substituent characterised by typical spectroscopic techniques, such as infrared spectroscopy, UV-visible spectroscopy, and 1 H and 13 C Nuclear Magnetic Resonance. In turn, TCN was deposited onto interdigitated electrode (IDE) for the measurement of thin-film resistance.The resistance values of synthesised compound is caused the effect of donating substituent attached to the acetylidethiourea, which indeed altered the conductivity performances of fabricated IDE substrate. In fact, the theoretical calculation also was carried out using Gaussian 09 to evaluate the relationship between experimental and theoretical analyses of acetylide-thiourea semiconductor properties in term of energy band gap and the sensing response to the selected analyte. AbstractStudi Sifat Semikonduktor Asetilida-Thiourea sebagai Substrat Elektroda Terdigitasi (IDEs) menuju Aplikasi dalam Teknologi Penginderaan Gas. Bio ethanol adalah salah satu bahan bakar potensial di masa depan. Namun campuran etanol dalam air memiliki titik azeotrop pada konsentrasi 95,6 % berat, sehingga sulit untuk dimurnikan lebih lanjut. Metode umum yang dipakai dalam pemurnian etanol adalah menggunakan kolom distilasi azeotropik yang membutuhkan energi yang intensif dan penambahan solven tertentu. Pada penelitian ini, pemurnian etanol dilakukan dengan kolom adsorpsi dengan bahan isian cincin zeolite di dalamnya. Zeolit alam sebelum digunakan dimodifikasi dengan larutan NaOH agar kemampuan penjerapan (adsorpsi) air menjadi meningkat. Kemurnian etanol dapat mencapai lebih dari 99% dengan zeolite termodifikasi. Modifikasi ini juga meningkatkan waktu saturasi kolom sehingga kolom bisa dijalankan dengan efisien.

Prototype of a Textronic Sensor Created with a Physical Vacuum Deposition Process for Staphylococcus aureus Detection

“…Interdigitated electrodes are made in the form of two individual addressable comb-like interdigitated structures. IDEs form part of a group of transducers widely used in metrology where impedance and capacity changes are essential, e.g., in humidity and gas sensors, and in biosensors for tumor cell and cardiac troponin T biomarker detection or in biomedical applications [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. In the literature, there are also reports on the usage of IDEs in sterility tests in the food industry.…”

Impedimetric Detection of Ammonia and Low Molecular Weight Amines in the Gas Phase with Covalent Organic Frameworks

“…The IDEs allow increasing contact area between the sensing material and the electrodes [19]. In addition, IDEs facilitate the measurement of multiple electrochemical properties, such as capacitance, conductivity/resistance, impedance, etc., without sophisticated electronics [19,20]. The impedimetric gas sensors have lately received considerable interest owing to the increasing demand for monitoring harmful gases, and because of its good selectivity, fast detection, high sensitivity, and facile sample pretreatment [21].…”