Synthesis and characterization of nano ZnO and CdO

Abstract

Nano ZnO synthesized with and without surfactant adopting Solid State Reaction (SSR) method, the later at four different temperatures and by Aqueous Chemical Method (ACM) is reported. CdO synthesized by ACM is also presented. The ZnO nanorods by SSR with surfactant are of hexagonal shape with diameter between 2030 nm and lengths of about 350500 nm, while that without surfactant does not exhibit rod like morphology. The particle size increases from 35 to 59 nm with temperature in the range 500 to 800°C. ACM resulted in a particle size of 1535 nm whose SEM shows the nanoparticles forming flakes. Optical properties are studied. A blue shift is observed where the band gap increases from 3.37 (bulk) to 3.62 eV. The increase in band gap is due to quantum confinement effect. CdO synthesized by ACM was of size 3070 nm. The XRD pattern of CdO reveals NaCl structure.

Synthesis and Characterization of Rare Earth Ion Doped Nano ZnO

“…ZnO, an II-VI compound semiconductor with a wide band gap of about 3.4 eV, is an attractive material for applications in optical devices such as blue-, violet-, and UV-light emitting diodes (LEDs) and laser diodes (LDs). We have reported quantum confinement, influence of surfactant and temperature on the morphology of nano ZnO [8]. In the present paper, we report the influence of rare earth element erbium as dopant in ZnO.…”

Recent Advances in ZnO Nanomaterial-Mediated Biological Applications and Action Mechanisms

“…To date, a wide variety of ZnO nanoparticle preparation methods have been put forward, from physicochemical synthesis to green biogenic synthesis. Initially, physicochemical synthesis was the common preparation means, which mainly includes the methods of precipitation [16][17][18][19][20][21], electrochemical deposition [22][23][24], hydrothermal synthesis [25][26][27][28][29][30][31][32], sol-gel process [33,34], solid state reaction [35,36], chemical vapor synthesis [37], gel combustion [38], microemulsion [39], solvothermal synthesis [40][41][42], spray pyrolysis [43], sputtering [44][45][46], sonication [47,48], microwave [49], thermal evaporation [50][51][52] and so on. Each of these methods has its own advantages.…”

Effect of Indium Doping on the Structural and Optical Properties of CdO thin films

“…It has n-type semiconducting and optical band gap between (2.2 -2.7) eV relying on the technique and the preparation conditions of the method used [5][6][7]. CdO thin films have been prepared by several ways such as, SILAR method [8], Spray pyrolysis [9], Vacuum evaporation [10], magnetron sputtering [11], pulsed laser deposition [12], sol-gel [13], solid state reaction (SSR) [14], Bath Chemical technique [15].…”