Preparation and Characterization of Tellurium Nano-Particles by Long Pulsed Laser Ablation

Abstract

A long pulsed laser ablation with a moving target at high speed technique was applied to prepare tellurium nanoparticles from a tellurium target under argon gas at atmospheric pressure. The prepared nanoparticles were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), and X-ray diffraction (XRD). The influence of the moving speed of the target on the size, morphology and crystallographic structure of the nanoparticles was investigeated. The results show that for the target moving at high speed without burning of the target the production of isolated nanoparticles is obtained. The diameter of the nanoparticles is ranging from 30 to 200 nm.

Preparation and Characterization of Teo2 Nan particles by Pulsed Laser Ablation in Water

“…The tail may be due to the scattering of a range of particle sizes and some type Urpach effect due to intergrain depletion regions (Gondal et al 2009) [23]. .The variation of (αhʋ) 2 with photon energy (hʋ) is depicted in Figure (4). The optical band gap Eg of TeO 2 NPs is determined from extrapolating the linear part of (αhʋ) 2 hʋ plot on the Xaxis.…”

“…Furthermore, chemicals like surfactants or ligands can be directly added to the liquid before laser ablation as in situ conjugation agent in order to control parameters like particle size or synthesize nanoparticle-conjugates with targeted properties like bioconjugates [3]. Tellurium thin films have been widely used as gas sensors at room temperature for the detection of nitrogen dioxide and ammonia and as cooling devices [4]. Nanoparticles have been prepared by a wide variety of techniques such as pulsed laser deposition [5], chemical reduction [6], photoreduction [7], electrochemical reduction [8]...etc.…”

Synthesis of tunable tellurium nanoparticles

“…Up to now, tellurium nanostructures have been synthesized by different methodologies like wet chemistry [16][17][18][19], biosynthesis [20][21][22][23], laser ablation in gas [24] but never by pulsed laser ablation in liquids (PLAL) [25]. The advantages of PLAL are the purity of the surface i.e.…”