Novel Synthesis of LaFeO₃ Nanostructure Dendrites: A Systematic Investigation of Growth Mechanism, Properties, and Biosensing for Highly Selective Determination of Neurotransmitter Compounds

Abstract

Single-crystalline novel LaFeO 3 dendritic nanostructures are synthesized by a well-controlled, surfactantassisted facile hydrothermal process. The morphology of the material is investigated by high-resolution transmission and scanning electron microscopy. The crystal nature and chemical composition of LaFeO 3 dendritic nanostructures are revealed from the X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. Structural characterizations imply the preferential growth along the [121] direction by oriented attachment of LaFeO 3 nanoparticles in the diffusion limit, leading to the formation of LaFeO 3 dendrites. The microscopic studies confirm the formation of dendrites with a length of 3−4 μm, a branch diameter of 80 nm, and a length of 1−1.5 μm. The possible growth mechanism of the dendritic morphology is discussed from the aspect of diffusion and oriented attachment based on experimental results. Further, the electrochemical measurements performed on LaFeO 3 dendritic nanostructures deposited on the surface of a glassy carbon electrode exhibit a strong promoting effect. The oxidation current is proportional to concentration in the linear range of 8.2 × 10 −8 to 1.6 × 10 −7 M with a detection limit of 62 nM at S/N = 3. Meanwhile, the sensor effectively avoids the interference of ascorbic acid and uric acid, and it is successfully applied to determine the dopamine formulations with high selectivity and sensitivity.

In-Depth Understanding of the Relation between CuAlO2 Particle Size and Morphology for Ozone Gas Sensor Detection at a Nanoscale Level

“…The surfactant was found to have a specific mechanism involved in the synthesis of nanostructures; that is, during the synthesis process, the surfactants were absorbed by the growing crystal and depending upon the precursor concentration and surfactant property, they moderate the growth rate of crystal faces, which thereby controls the shape and size through an Ostwald ripening process. 37 It was observed that the flower and hexagonal morphologies of CuAlO 2 structures could be reproduced using the surfactant-assisted hydrothermal process used in the present study. Further, CuAlO 2 samples without surfactant were also prepared, where only agglomerated structures were observed ( Figure S1, Supporting Information), which is of no interest for the present study.…”

Detection of the neurotransmitter dopamine by a glassy carbon electrode modified with self-assembled perovskite LaFeO3 microspheres made up of nanospheres

“…All the peaks were calibrated using C1s (284.6 eV) as the reference. La peaks were observed at 845.8 eV which corresponds to spin-orbit splitting of 3d 5 A N 2 adsorption-desorption isotherm (Fig. 2(d)) of LaFeO 3 microspheres exhibit a type-IV isotherm with a hysteretic loop in the range 0.6-1.0 P/P o , indicating the presence of mesoporosity.…”

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

“…Most researchers have used crystalline LaFeO 3 nanoparticles toward potential applications, but data comparison with respect to amorphous LaFeO 3 nanoparticles is limited [46,[64][65][66]. To elucidate the effects of surfactant (CTAB) and LaFeO 3 nanofillers (amorphous vs. crystalline), different fillers were added into PVA matrix (which is the major dominant constituent of the QPVA) to form composites, and their conductivities were measured at 30-60 • C. The fillers included pure CTAB, pure LaFeO 3 nanofillers (amorphous phase without CTAB), as-synthesized LaFeO 3 nanofillers (CTAB-functionalized amorphous phase), and annealed LaFeO 3 nanofillers (crystalline).…”