Effects of annealing temperature on some structural and optical properties of ZnO nanoparticles prepared by a modified sol–gel combustion method

Synthesis and characterization of a narrow size distribution of zinc oxide nanoparticles

“…The band at 375 cm −1 corresponds to the E 2 mode of hexagonal ZnO (Raman active). 11 There were several small absorption bands at 930, 1050, and 3400 cm …”

“…8 Therefore, several new routes have been developed to synthesize ZnO-NPs, such as a wet polymerization method, sol-gel, sol-gel combustion, precipitation, hydrothermal, solvothermal, chemical vapor deposition (CVD), microwave assisted, a sonochemical method, and thermal oxidation. [9][10][11][12][13][14][15][16][17][18] Some of these methods have limitations. For example, it is not easy to control the growth of the ZnO nanostructures in the microwave, sol-gel, and sol-gel combustion methods because of the speed of the reactions.…”

The role of ammonia hydroxide in the formation of ZnO hexagonal nanodisks using sol–gel technique and their photocatalytic study

“…Holes could react with water adhering to the surfaces of ZnO hexagonal nanodisks to form highly reactive hydroxyl radicals ( OH) as shown in reaction (15). Meanwhile, oxygen acted as an electron acceptor by forming a superoxide radical anion (O ¡ 2 ) as shown in reaction (16). The organic dye was degraded by these hydroxyl radicals ( OH) and superoxide radical anions (O ¡ 2 ) into less harmful by-product such as water and carbon dioxide as shown in reaction (17): …”

“…Because of its large thickness to diagonal aspect ratio and large surface area, ZnO hexagonal nanodisks could have potential applications in information storages, transducers, light emitters, photocatalysts and sensors. [12] Different methods have been used to synthesise ZnO hexagonal nanodisks such as solvothermal, [13] hydrothermal, [14] microwave irradiation, [15] solÀgel combustion [16] and aqueous chemical growth (ACG). [17] Among these methods, solvothermal and hydrothermal are relatively simple processes and can be carried out at relatively low synthesis temperature.…”

Investigations on Photoluminescence Properties of Nanocrystalline Zno Particles Synthesized by Sol-Gel Route.

“…However, there is a compromise in the development of a method for preparing low cost ZnO-NPs on a large scale and with high crystalline quality for optoelectronic application. Recently, several new ways have been developed to synthesize ZnO-NPs, such as the sonochemical method [8], oxidation process [9], sol-gel synthesis [10], a polymerization method [11], precipitation [12,13], solvothermal and hydrothermal methods [14][15][16], CVD [17,18], laser ablation [19] and sol-gel-combustion [20]. In general, the preparation of nanoparticles is a complicated process, and a wide variety of different variables may affect the properties of the final product.…”