Nucleation front instability in two-dimensional (2D) nanosheet gadolinium-doped cerium oxide (CGO) formation
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Herein we report for the first time the synthesis of ceramic-organic three-dimensional (3D) layered gadolinium-doped cerium oxide (Ce1-XGdXO2-delta,CGO) and its exfoliation into two-dimensional (2D) nano-sheets. We adopt a water-based synthetic route via a homogenous precipitation approach at low temperatures (10-80 degrees C). The reaction conditions are tuned to investigate the effects of thermal energy on the final morphology. A low temperature (40 degrees C) morphological transition from nanoparticles (1D) to two-dimensional (2D) nanosheets is observed and associated with a low thermal energy transition of ca. 2.6 kJ mol(-1). For the 3D-layered material, exfoliation experiments are conducted in water/ethanol solutions. Systems at volume fractions ranging from 0.15 to 0.35 are demonstrated to promote under ultrasonic treatment the delamination into 2D nanosheets.
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MARANI, DEBORA; MORAES, LETICIA P.R.; GUALANDRIS, FABRIZIO; SANNA, SIMONE; FLORIO, DANIEL Z. de; ESPOSITO, VINCENZO; FONSECA, FABIO C. Nucleation front instability in two-dimensional (2D) nanosheet gadolinium-doped cerium oxide (CGO) formation. CrystEngComm, v. 20, n. 10, p. 1405-1410, 2018. DOI: 10.1039/c7ce01737e. Disponível em: http://repositorio.ipen.br/handle/123456789/28967. Acesso em: 30 Dec 2025.
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