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- Title
KIT-5-Assisted Synthesis of Mesoporous SnO 2 for High-Performance Humidity Sensors with a Swift Response/Recovery Speed.
- Authors
Vojisavljević, Katarina; Savić, Slavica M.; Počuča-Nešić, Milica; Hodžić, Aden; Kriechbaum, Manfred; Ribić, Vesna; Rečnik, Aleksander; Vukašinović, Jelena; Branković, Goran; Djokić, Veljko
- Abstract
Developing highly efficient semiconductor metal oxide (SMOX) sensors capable of accurate and fast responses to environmental humidity is still a challenging task. In addition to a not so pronounced sensitivity to relative humidity change, most of the SMOXs cannot meet the criteria of real-time humidity sensing due to their long response/recovery time. The way to tackle this problem is to control adsorption/desorption processes, i.e., water-vapor molecular dynamics, over the sensor's active layer through the powder and pore morphology design. With this in mind, a KIT-5-mediated synthesis was used to achieve mesoporous tin (IV) oxide replica (SnO2-R) with controlled pore size and ordering through template inversion and compared with a sol-gel synthesized powder (SnO2-SG). Unlike SnO2-SG, SnO2-R possessed a high specific surface area and quite an open pore structure, similar to the KIT-5, as observed by TEM, BET and SWAXS analyses. According to TEM, SnO2-R consisted of fine-grained globular particles and some percent of exaggerated, grown twinned crystals. The distinctive morphology of the SnO2-R-based sensor, with its specific pore structure and an increased number of oxygen-related defects associated with the powder preparation process and detected at the sensor surface by XPS analysis, contributed to excellent humidity sensing performances at room temperature, comprised of a low hysteresis error (3.7%), sensitivity of 406.8 kΩ/RH% and swift response/recovery speed (4 s/6 s).
- Subjects
STANNIC oxide; POWDERS; METAL oxide semiconductors; HUMIDITY; POROSITY; DETECTORS
- Publication
Molecules, 2023, Vol 28, Issue 4, p1754
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules28041754