Artigo de peri??dico
Tuning of shape, defects, and disorder in lanthanum-doped ceria nanoparticles
Registro en:
2574-0970
7
5
10.1021/acsanm.2c00942
0000-0003-0708-2021
66.1
81
Autor
TRINDADE, FABIANE J.
DAMASCENO, SERGIO
OTUBO, LARISSA
FELEZ, MARISSOL R.
FLORIO, DANIEL Z. de
FONSECA, FABIO C.
FERLAUTO, ANDRE S.
Resumen
The design of nanomaterials by tailoring the size, shape, and surface chemistry has a significant impact on their properties. The fine-tuning of structural defects of ceria rod-like and cube-like-shaped nanoparticles was performed via La3+ doping in molar ratios of 0???70 mol %. Morphology control was achieved by varying the hydrothermal synthesis temperature. For LaxCe1???xO2???x/2 samples prepared at 110 ??C, nanorod-like structures are obtained for x < 0.30 and a random morphology of interconnecting polyhedra is achieved for a larger x. The ceria fluorite crystalline structure is maintained at an x of up to 0.60, and both Raman and X-ray diffraction results indicate a high level of defects and disorder in the crystalline structure. For LaxCe1???xO2???x/2 samples prepared at 180 ??C, cube-shaped particles are predominant for an x of up to 0.10; however, for x> 0.20, two fluorite phases with different lattice parameters are associated with two distinct shapes, cubes and rods The La concentration in nanocubes is limited to x = 0.10 even for samples prepared with higher nominal La concentrations, whereas the nanorods contain larger La concentrations. The demonstrated morphology and defect control on La-doped ceria nanoparticles are critical for applications such as high-temperature oxide catalysts. Funda????o de Amparo ?? Pesquisa do Estado de S??o Paulo (FAPESP) FAPESP: 17/11937-4; 19/00776-5