Facet-Controlled Synthesis of CeO₂ Nanoparticles for High-Performance CeO₂ Nanoparticle/SnO₂ Nanosheet Hybrid Gas Sensors

Abstract

CeO2 nanocubes with metastable {100} facets and CeO2 nanooctahedrons with the most stable {111} facets are herein fabricated by controlling the morphology and facets of CeO2 nanoparticles. SnO2 nanosheet-based assembled films coated with these CeO2 nanocubes or CeO2 nanooctahedrons yield {100} CeO2 nanocubes/SnO2 nanosheets and {111} CeO2 nanooctahedron/SnO2 nanosheet hybrid gas sensors, respectively. The hybrid sensors with CeO2 nanoparticles exhibited enhanced sensing responses to numerous chemical species relative to a pristine SnO2 nanosheet gas sensor, including acetone, hydrogen, ethanol, ammonia, acetaldehyde, and allyl mercaptan. In particular, the responses of {100} CeO2 nanocubes/SnO2 nanosheets and {111} CeO2 nanooctahedron/SnO2 nanosheet gas sensors to acetone or allyl mercaptan were 6.8 and 10.3 times higher, respectively, than that of the pristine SnO2 nanosheet gas sensor. Furthermore, the sensor response to ammonia was 2.5 times higher than that of a commercial volatile organic compound (VOC) gas sensor (TGS2602, Figaro Engineering Inc.). The CeO2 nanocube-based sensor with exposed metastable {100} facets promotes the adsorption and oxidation of VOCs owing to the higher surface energy of the metastable {100} facets and therefore exhibits a higher sensing performance than the CeO2 nanooctahedron-based sensor with an exposed {111} facet. The developed sensors show excellent potential for the detection of gas markers in human breath and perspiration for disease diagnosis.

Ultrasensitive and Exclusive Chemiresistors with a ZIF-67-Derived Oxide Cage/Nanofiber Co3O4/In2O3 Heterostructure for Acetone Detection

“…To date, various chemiresistive gas sensors, including metal oxide semiconductors (MOSs), ,,, metal dichalcogenides, , transition metal carbides or carbonitrides (Mxenes), , and carbonaceous materials, have attracted considerable attention. Among them, MOSs, such as In 2 O 3 , ,, ZnO, ,, SnO 2 , , WO 3 , CeO 2 , , Co 3 O 4 , and CuO, owing to their low cost, fast response time, simple fabrication, excellent stability, and rich active sites, have been widely used for detecting VOCs. In 2 O 3 , a typical n-type semiconductor with a wide band gap of 2.6 eV, has good electrical and chemical stability.…”

ZIF-67/BiOCl nanocomposites for highly efficient detection of NO2gas at room temperature

“…However, metal oxide-based gas sensors have many disadvantages, such as poor selectivity, sluggish moisture resistance, and lower sensitivity. [3][4][5][6][7] Therefore, it is crucial to develop new sensitive materials with excellent selectivity and stability. For this purpose, the two-dimensional (2D) laminate material has gained much attention due to its unique architectural properties, large specic surface area, and excellent electrical conductivity.…”

Co/CeO2/C composites derived from bimetallic metal–organic frameworks for efficient microwave absorption

“…[9][10][11] CeO 2 , an n-type semiconductor material, has been widely used in popular energy and environmental fields and other comprehensive research topics. [12][13][14][15][16] Recently, studies on CeO 2 being used in MA materials have become increasingly popular. [17][18][19][20] Starting from its internal structural features, the properties of CeO 2 are mainly determined by its intrinsic structural defects in the case of conversion between Ce 4+ and Ce 3+ oxidation states, such as oxygen vacancies and interstitial atoms.…”