Novel route to prepare lanthanum oxide nanoparticles for optoelectronic devices

Abstract

In this study, we report, for the first time, on synthesis of lanthanum oxide [Formula: see text] nanoparticles NPs by laser ablation in water without using surfactant. The effect of laser wavelength on the optical and structural properties of [Formula: see text] NPs was investigated. X-ray diffraction studies show formation of polycrystalline lanthanum oxide with pure cubic phase and the crystallinity of the nanoparticles synthesized with [Formula: see text] nm was better than that prepared with [Formula: see text] nm. The optical absorption investigations reveal that a strong absorption peak at 234 nm was observed for [Formula: see text] NPs prepared at 532 nm laser wavelength. The optical energy gap of [Formula: see text] NPs synthesized with 532 and 1064 nm laser wavelengths were 5 and 4.5 eV, respectively. Scanning electron microscope (SEM) investigation indicated the formation of nanoparticles with average particle size of 35 nm for [Formula: see text] prepared with 532 nm and was 75 nm for [Formula: see text] prepared with 1064 nm laser wavelength. The effect of laser wavelength on the optoelectronic properties of hybrid In/p-[Formula: see text]/n-Si photodetector was studied. The responsivity studies of the photodetectors show the presence of two response peaks at 250 and 750 nm.

Toward efficient dye degradation and the bactericidal behavior of Mo-doped La2O3 nanostructures

“…MOs such as ZnO, TiO 2 , La 2 O 3 , CeO 2 and so forth are utilized for dye degradation (25)(26)(27)(28)(29). Among these alluring and potentially beneficial rare earth MOs, is La 2 O 3 which has an energy gap of 4.3-5.8 eV (30,31). Due to rare electronic configuration [4f electrons] lanthanides, its applications have been reported in diverse fields (32,33).…”

“…(37). In numerous applications, La 2 O 3 has been used, such as H 2 storage materials, superconductors, optoelectronic gadgets, laser crystal, LEDs, biosensors, excessive refraction optical fiber, catalyst and so forth (30)(31)(32)(33)38). Additionally, as a basic element, lanthanum's oxides and hydroxides can react with CO 2 in the air to generate a less crystalline carbonate (39).…”

“…Among these, co-precipitation is the most convenient and economic method, as it does not require any specific equipment (44). The application field and catalytic activity of synthesized La 2 O 3 nanostructures has been shown to be highly influenced by preparation procedure (30,45).…”

“…[25][26][27][28][29] Among the alluring and potentially benecial rare-earth MOs is La 2 O 3 which has an energy gap of 4.3-5.8 eV. 30,31 Due to the rare electronic conguration [4f electrons] in lanthanides, their applications have been reported in diverse elds. 32,33 La 2 O 3 has properties that set it apart from the other oxides in the series, due to the fact that La 3+ is the only trivalent cation among the rare-earth elements without 4f electrons and possesses a simple xenon-like electronic structure.…”

“…37 La 2 O 3 has been used in numerous applications, such as H 2 storage materials, superconductors, optoelectronic gadgets, laser crystals, LEDs, biosensors, excessive refraction optical bers, and catalysts. [30][31][32][33]38 Additionally, as a basic element, lanthanum's oxides and hydroxides can react with CO 2 in the air to generate a less crystalline carbonate. 39 For the synthesis of La 2 O 3 nanostructures, several approaches have been devised, including hydrothermal, 40 sol-gel, 41 thermal deposition, 42 co-precipitation, 34,43 and sonochemical, 32 as well as other physiochemical techniques.…”