Developing Conductive Highly Ordered Zinc Oxide Nanorods by Acetylacetonate-Assisted Growth

Abstract

Highly ordered vertically grown zinc oxide nanorods (ZnO NRs) were synthesized on ZnO-coated SiO2/Si substrate using zinc acetylacetonate hydrate as a precursor via a simple hydrothermal method at 85 °C. We used 0.05 M of ZnO solution to facilitate the growth of ZnO NRs and the immersion time was varied from 0.5 to 4 h. The atomic force microscopy revealed the surface roughness of ZnO seed layer used to grow the ZnO NRs. The morphology of vertically grown ZnO NRs was observed by field emission scanning electron microscopy. X-ray diffraction examination and transmission electron microscopy confirmed that the structure of highly ordered ZnO NRs was crystalline with a strong (002) peak corresponded to ZnO hexagonal wurtzite structure. The growth of highly ordered ZnO NRs was favorable due to the continuous supply of Zn2+ ions and chelating agents properties obtained from the acetylacetonate-derived precursor during the synthesis. Two-point probe current–voltage measurement and UV–vis spectroscopy of the ZnO NRs indicated a resistivity and optical bandgap value of 0.44 Ω.cm and 3.35 eV, respectively. The photoluminescence spectrum showed a broad peak centered at 623 nm in the visible region corresponded to the oxygen vacancies from the ZnO NRs. This study demonstrates that acetylacetonate-derived precursors can be used for the production of ZnO NRs-based devices with a potential application in biosensors.

Bi-doping improves the magnetic properties of zinc oxide nanowires

“…This is in good agreement with the previously reported literature for the (002) plane of single-crystal ZnO NWs, showing that the ZnO grew vertically along the c-axis. 44 The pre-deposited seed layer containing nanograins grew along the (002) polar surface, supporting the nucleation sites for the subsequent growth of the ZnO NWs. 41 The NWs grew from the nucleation sites on the O-terminated (002) polar surfaces.…”

Recent Advances in Zinc Oxide Nanostructures with Antimicrobial Activities

“…Thus, a two-step approach, including the synthesis of a thin seed layer on the substrate and co-precipitation in aqueous solutions, has been adopted widely to prepare vertical aligned ZnO nanorods/nanowires. The seed layer serves as the nucleation site for vertical growth of dense ZnO nanostructures [200,210,[221][222][223]. ZnO seed layer can be deposited on desired substrates using PLD, ALD, spin coating and sol-gel techniques [200].…”

“…In contrast, the coverage density of ZnO nanorod arrays is much higher on the seeded substrates as expected. More recently, Karim et al synthesized ZnO nanorod arrays on ZnO-seeded SiO 2 /Si substrate by dipping in an aqueous solution of zinc acetylacetonate hydrate and HMTA at 85 • C for 0.5-4 h [223]. High-density of vertically aligned nanorods are grown on the ZnO-seeded substrate for 0.5 h. The length of ZnO nanorod array is~0.9 µm (Figure 15a).…”

“…Right panels: crosssectional SEM micrographs. Reproduced from[223] under the terms of the Creative Commons Attribution License (CC BY).…”

Evidence of room-temperature ferromagnetism in vertically aligned Bi–Co co-doped ZnO nanowires

“…In spintronics, ZnO-based diluted magnetic semiconductors (DMS) have attracted great interest, utilizing both spin and charge of the electron, which has been reported in detail in our previous studies [1]. ZnO is a weak ferromagnetic (FM) metal oxide and has been the focus of interest over the decades due to its extensive range of applications in spintronics, optoelectronics and magneto-electronic devices [2][3][4]. Single and multi-valent ions in ZnO are considered a promising alternative approach to realize ferromagnetism having a Curie temperature (T c ) above room temperature (RT).…”