Facile high‐performance film thermocouple made of strontium lanthanum chromate for temperature sensing in air

Abstract

Film thermocouples as the most effective tool are used to monitor the real‐time and accurate in situ temperature in harsh environment, which will demand their electrodes with high thermal‐resistant properties, high sensitivity, and stability. In this work, a series of solid solutions based on strontium lanthanum chromate were systematically investigated as new electrodes. LaCrO3 and La0.8Sr0.2CrO3 with some glass additives were chosen to fabricate high‐performance thick‐film thermocouple due to a bigger Fermi level difference between them. The thermocouple shows a high sensitivity (107.8 μV/°C) during static calibration, and an excellent reproducibility and stability during multicycle calibrations carried out up to 1550°C, resulting in a record ultra‐high temperature sensing in film thermocouples. This facile thermocouple may open up a new way to measure high temperature in air or oxidation atmosphere accurately.

Superior Thermoelectric Performance of Robust Column-Layer ITO Thin Films Tuning by Profuse Interfaces

“…24 Therefore, an ITO thin film assembled into a particular column-layer structure (columns for low thermal stress, layers for extension of crack path, and high-temperature stability) with profuse interfaces in different directions will be the most effective structure for optimizing the performance of ITO thin films. 25,26 In this study, we design an ITO thin film with appropriate electronic energetics to obtain a high crystal interface area to tune the oxygen vacancy defects and optimize the electrical The ITO target was connected to a direct-current (DC) power supply. Different powers in the range of 30−120 W were employed.…”

High‐Performance Reticular Porous Perovskite Coating with Wide‐Spectrum Absorption for Photothermal Conversion

“…[ 18 ] As discussed, the LaCrO 3 ‐based functional materials are usually designed in the form of coating or film in many practical applications. Presently, the preparation techniques of LaCrO 3 ‐based functional coatings or films are mainly involved in sol–gel, [ 23 ] screen printing, [ 24 ] plasma spraying, [ 25 ] magnetron sputtering, [ 26 ] molecular beam epitaxy, [ 27 ] etc. It is to be noted that these coatings or films were mainly used as interconnector layers for SOFCs, thermocouple, and transparent conducting films, rather than as a photothermal coating.…”

Optimizing the Properties of La0.8Sr0.2CrO3 Thin Films through Post-Annealing for High-Temperature Sensing

“…Therefore, the development of a new TFTC fabricated by conductive ceramics has been a trend to measure high temperatures in air [12][13][14][15]. Especially, conductive oxides with better oxidation resistance and higher Seebeck coefficients have become the most promising candidate materials of electrodes for TFTCs, such as In 2 O 3 , ITO, ZnO:Al (AZO), and La 1-x Sr x CrO 3 (xLSCO) [14,[16][17][18][19]. When In 2 O 3 and ITO were used to fabricate the electrodes of TFTCs, they had excellent performances with a maximum measurement temperature of 1280 • C, while a serious volatilization problem appeared for them above 1200 • C especially because of the losing of Sn 4+ from ITO, and the indium element is scarce in the earth [20][21][22].…”

“…Meanwhile, for xLSCO, wider applications in the energy and sensor fields of the present materials in the thin films field have also been reported in recent years. They are suitable for interconnect materials in solid oxide fuel cells [23][24][25], transparent electrolytes and electrodes of batteries and generators [26][27][28][29][30], thin-film fluorescent sensors, and high-temperature sensing [17,18,31,32], with their high melting point of 2490 • C, good conductivity, and high Seebeck coefficient. From our previous work [17], a screen-printed thick-film thermocouple fabricated by LaCrO 3 (LCO) and La 0.8 Sr 0.2 CrO 3 can be used to measure a temperature of 1550 • C for 10 h in air, which has inspired the fabrication of TFTCs by using xLSCO electrodes.…”

“…They are suitable for interconnect materials in solid oxide fuel cells [23][24][25], transparent electrolytes and electrodes of batteries and generators [26][27][28][29][30], thin-film fluorescent sensors, and high-temperature sensing [17,18,31,32], with their high melting point of 2490 • C, good conductivity, and high Seebeck coefficient. From our previous work [17], a screen-printed thick-film thermocouple fabricated by LaCrO 3 (LCO) and La 0.8 Sr 0.2 CrO 3 can be used to measure a temperature of 1550 • C for 10 h in air, which has inspired the fabrication of TFTCs by using xLSCO electrodes. Since then, some TFTCs fabricated by the 0.2LSCO thin film have been investigated, such as 0.2LSCO-In 2 O 3 [19] and 0.2LSCO-Pt [33], with a higher sensitivity and stable output voltage versus the temperature difference.…”