Phosphate ion sensor fabrication based on conductive polymer polypyrrole film coatings in doped phosphate using thick film technology

This study describes the development of chemical sensors to detect polypyrrole (PPy) based phosphate sensors in doped di-ammonium hydrogen phosphate (DAP) with thick film technology (TFT). Manufacturing screen-printed carbon electrode (SPCE) with thick film uses alumina substrate provided a more portable, miniature, inexpensive, and reduced use of samples and reagents. Polymer polypyrrole and di-ammonium hydrogen phosphate as sensitive membranes are electrodeposition on carbon electrodes. Characterization has been conducted to see the electrode morphology in scanning electron microscopy (SEM) test, which showed that sensitive material particles were distributed evenly on the surface of the sample and spherical. The energy dispersive spectroscopy (EDS) experiment results showed the atomic composition respectively carbon 86.95 %, nitrogen 6.94 %, oxygen 5.9 %, and phosphate 0.21 %, which were exposed to the electrode. The performance test of electrodes with a phosphate standard solution has proceeded at a concentration between 5 to 100 mg/l, which is measured using the galvanostatic method. The voltage range was from 0.252 to 0.957 V with R2 at approximately 90.265 %. The results of sensor performance were concluded that the electrode was able to detect phosphate ions.

Parameter Studies of Ceramic MEMS Microhotplates Fabricated by Laser Micromilling Technology

This paper presents a modeling of technology aspects for fabrication ceramic microelectromechanical systems (MEMS) microhotplate and surface mounting device (SMD) packaging for (MOX) gas sensors applications. Innovative claims include: demonstration of flexible opportunities for new fabrication process flows based on laser micromilling tech; modeling of power consumption MEMS microhotplate depending on the thickness and topology; demonstration of necessity changing thick film technology of metallization to vacuum sputtering by reducing of power consumption. The results show possibility to fast fabrication of different topologies for ceramic MEMS microhotplate in form-factor of SOT-23 type SMD package.

The research of the electrical properties of thick-film electrodes on piezoceramics in special conditions

The results of the study of the electrophysical properties of metal-ceramic compositions based on nickel boride depending on the composition, heat treatment conditions and after exposure to mixed reactor radiation (neutrons and γ-radiation) are presented. A method of metallization of piezoelectric ceramics based on materials developed using thick-film technology is proposed. The paper discusses the results of the study of physicochemical processes occurring during the heat treatment of films and their influence on the properties of piezoceramics. The advantages of thick-film technology, widely used in microelectronics, are well known, but the use of noble metals causes a number of serious production problems associated with their high cost, the need for waste management and reporting; Operational disadvantages include instability of properties (especially under mixed reactor irradiation conditions) due to the high diffusion coefficients of these metals (especially silver) and their leaching when soldering the leads. This work is devoted to the study of the electrophysical properties of pastes for thick-film metallization of piezoceramics, which do not contain extremely scarce and noble metals, burned in air, are not inferior in their operational parameters to pastes based on silver-palladium alloy and are intended to replace the latter.