Preparation of Gd 2 O 3 Ultrafine Nanoparticles by Pulse Electrodeposition Followed by Heat-treatment Method
Gd 2 O 3 nanoparticles were prepared by a two-step process; cathodic electrodeposition followed by heat-treatment method. First, Gd(OH) 3 nanoparticles was galvanostatically deposited from nitrate bath on the steel substrate by pulse current (PC) mode. The deposition experiments was conducted at a typical on-time and off-time (t on =1ms and t off =1ms) for 60 min. The electrodeposited precursor was then heat-treated at 600 o C for 3h to obtain oxide product (i.e. Gd 2 O 3). The morphological
... he morphological and structural analyses confirmed that the gadolinium hydroxynitrate nanoparticles with composition of [Gd(OH) 2.5 (NO 3) 0.5 yH 2 O] and uniform size about 10 nm have been prepared during pulse cathodic electrodeposition process. Furthermore, mechanism of the gadolinium hydroxynitrate nanoparticles was explained based on the base (OH-) electrogeneration process on the cathode surface. The morphological observations by SEM and TEM, and structural analyses via XRD and FT-IR revealed that the oxide product is composed of well-dispersed Gd 2 O 3 nanoparticles with pure cubic crystalline structure. It was observed that the calcination process has no effect on the morphology of the Gd 2 O 3 nanoparticles. Mechanism of oxide formation during heat-treatment step was investigated by DSC-TG analysis and discussed in detail. The results of this work showed that pulse current deposition followed by heat-treatment can be recognized as an easy and facile method for preparation of the Gd 2 O 3 fine nanoparticles.