An efficient low-temperature triethylamine gas sensor based on 2D ultrathin SnO₂ nanofilms

Abstract

The quest to develop inexpensive chemical sensing materials that are energy-efficient, portable, and with efficient performance lies at the center of next-generation sensor development. Owing to their low cost, easy preparation, high response, and smooth integration with electronic circuits, metal oxide semiconductors have received particular attention. Yet, metal oxide semiconductor based sensors often suffer from high power consumption due to their high operating temperature, which hinders them from practical applications. To solve this problem, herein, we proposed ultrathin sub-4 nm SnO2 films synthesized by a facile tunable hydrothermal method. Benefiting immensely from its two-dimensional anisotropic nature, the proposed SnO2 ultra-thin film exhibits a large specific area of 94.41 m2 g−1 and possesses surface oxygen vacancies. The obtained sample was practically applied as a gas sensor; the results indicate that the ultra-thin SnO2 film based sensor exhibits the highest sensitivity to triethylamine (19.2 at 100 ppm), outstanding repeatability, and excellent sensing selectivity at a low working temperature of 150 °C.

Metal Oxide Semiconductor Sensors for Triethylamine Detection: Sensing Performance and Improvements

“…The test results show that the high response to 50 ppm TEA can reach 43.771 at 268 • C. Meanwhile, the low detection limit (1 ppm) and rapid response/recovery are also advantages of the material. In one recent report, Liu et al [69] designed 2D ultrathin SnO 2 nanofilms for manufacturing low-temperature TEA gas sensors. They studied the effect of calcination temperature on crystal crystallization and found that with the increase in temperature, the crystal size decreased, and the uniformity and density of the surface particles gradually increases.…”

Highly Selective and Humidity-Resistant Triethylamine Sensors Based on Pt and Cr2O3 Nanoparticles

“…9,10 Metal oxide semiconductor (MOS) gas sensor has a wide range of application prospects due to its high response value, low price, and simple fabrication process. The MOS materials including ZnO, 5 WO 3 , 11 SnO 2 , 12 In 2 O 3 , 13 MoO 3 , 14 Fe 3 O 4 , 15 Co 3 O 4 , 16 NiO 17 have been widely reported to detect TEA.…”

“…The gas sensor mainly has an electrochemical gas sensor, a solid electrolyte gas sensor, a semiconductor gas sensor, and others. , Metal oxide semiconductor (MOS) gas sensor has a wide range of application prospects due to its high response value, low price, and simple fabrication process. The MOS materials including ZnO, WO 3 , SnO 2 , In 2 O 3 , MoO 3 , Fe 3 O 4 , Co 3 O 4 , NiO have been widely reported to detect TEA.…”