Studies on the Growth Control of ZnO Nanostructures synthesized by the Chemical Method

Abstract

ZnO nanostructures were synthesized through a chemical method using different Zn precursors and hexamethylenetetramine (HMTA) at 90 °C. The effects of the reactants on the morphological evolution of ZnO nanorods were investigated. The samples were characterized by using XRD, SEM, EDX and BET. The hexagonal wurtzite phase of ZnO was confirmed by X-ray diffraction (XRD). The performed analysis indicated that different morphologies were obtained by changing the reactants.Se sintetizaron nanoestructuras de ZnO por método químico usando diferentes precursores de Zn y hexametilentetraamina (HMTA) a 90 °C y se investigaron los efectos de los reactivos sobre la evolución morfológica de las nanovarillas de ZnO. Las muestras se caracterizaron mediante DRX, SEM, EDX y BET. Se confirmó la fase hexagonal wurtzita para todas las muestras por difracción de rayos x (DRX). Los análisis realizados indican que cambiando los reactivos se obtienen diferentes morfologías. Palabras clave:ZnO; crecimiento de cristales; nanoestructuras; síntesis química.

Early Stages of Aluminum-Doped Zinc Oxide Growth on Silicon Nanowires

“…The signal intensity profile shown in Figure 3 b was extracted from the light blue box shown in (a). The measured interplanar distance for the specific crystallographic direction was 2.48 Å, which is compatible with the wurtzite crystal structure, with the (100) planes having an interplanar distance equal to 2.488 Å [ 36 , 37 ].…”

Counter-ion influence on the mechanism of HMTA-mediated ZnO formation

“…Given the higher stability of LBZC and LBZS precursors compared to LBZA, this could explain why these phases do not easily transform into ZnO. This does not preclude that ZnCl 2 and ZnSO 4 can be used to form ZnO via a HMTA-mediated precipitation, as this has been achieved, 5,23,25 but it does show that these systems will likely be more sensitive to specific reaction conditions and that their transition into ZnO might be less straightforward.…”

“…The formation of ZnO using HMTA is not limited to the use of zinc acetate or zinc nitrate, as other zinc salts such as zinc N-dodecyl-N,N-dimethylammonioacetic bromide, 11 zinc formate, 5 zinc chloride 23,24 and zinc sulphate, 25 have been successfully used. However, only a few papers used similar reaction conditions for different zinc salts to investigate the influence of the counter-ion 5,23 so that a general understanding of the counter-ion role during the ZnO formation is currently lacking. To date counter-ions are mainly described as capping agents, e.g.…”

Bactericidal Properties of Natural Fibers Hybrid Functionalized with ZnO/Cu2+ and ZnO/Cu0

“…It was not detected by XRD the presence of wurtzite ZnO-NPs (2θ signals at 34.5° (002), 36.5° (101), 47.7° (102), 56.9° (110), 62.7° (103), 66.4° (200), 67.8° (112), 69.3° (201), 72.7° (004) and 77.1° (202)) [ 64 , 65 ] and Cu-NPs (2θ signals at 43.2°(111), 50.1° (200), and 74.1° (220)) [ 66 , 67 ] on the functionalized cotton fibers. The shallow content (ppm) of copper ions and zinc oxide particles in the colloidal bath [ 8 ] and overlapping of X-ray signals from the NPs by the amorphous cellulose halo and other components in the CF (such as hemicellulose, lignin, and pectins) [ 68 ] can explain this absence of the x-ray diffraction from the crystal planes of the ZnO and copper nanoparticles in the XRD data from the functionalized cotton fibers.…”