ABSTRACT

The present article reports an accelerated growth technique for fabrication of 2D assembly of ZnO nanostructure and investigated the impact of concentration variance on their grown morphology. The combination of zinc nitrate hexahydrate [Zn (NO₃)₂ · 6H₂O] and hexamethylenetetramine (HMTA) is employed as growth solution having pH value of 6.0. The assembly of 2D nanostructures grown on microtip is accelerated by introducing the ultrafine discharge in the chemical growth solution. The synthesis, deposition, and growth time were limited to 20 seconds only. After deposition and growth, annealing heat treatment was applied at 95°C for 45 minutes to eliminate any impurities or crystal defects. The structural/morphological characterization through FESEM confirms that the fabricated nanostructure is of 2D nanosheet-like at lower molar concentration (0.10 M). Nevertheless, at higher concentration (0.20 M), the grown morphology changes to marigold flower-like structure with porousness in its crystal structure. The chemical characterization through EDX confirms the dominance of the ZnO in the fabricated nanostructure. The XRD results confirm the phase pure hexagonal wurtzite structure of ZnO with an average crystalline thickness of ≈27 nm. The availability of functional group and molecular fingerprint corresponds to ZnO stretching is identified by FTIR while elemental composition and their chemical states were analyzed by XPS.

摘要

本文报道了一种用于制造 ZnO 纳米结构二维组装的加速生长技术，并研究了浓度变化对其生长形态的影响。六水合硝酸锌[Zn (NO ₃ ) ₂  · 6H ₂O]和六亚甲基四胺(HMTA)用作pH值为6.0的生长溶液。通过在化学生长溶液中引入超细放电来加速在微尖端上生长的 2D 纳米结构的组装。合成、沉积和生长时间仅限于 20 秒。在沉积和生长之后，在 95°C 下进行 45 分钟的退火热处理，以消除任何杂质或晶体缺陷。通过 FESEM 的结构/形态表征证实，制造的纳米结构在较低的摩尔浓度 (0.10 M) 下是二维纳米片状的。然而，在较高浓度（0.20 M）下，生长的形态变为万寿菊花状结构，其晶体结构具有多孔性。通过 EDX 进行的化学表征证实了 ZnO 在制造的纳米结构中的主导地位。XRD结果证实了ZnO的相纯六方纤锌矿结构，平均晶体厚度约为27 nm。通过 FTIR 确定了对应于 ZnO 拉伸的官能团和分子指纹的可用性，而通过 XPS 分析了元素组成及其化学状态。