The influence of annealing atmosphere on the optical properties of flower‐like ZnO

Abstract

The influence of annealing atmosphere on the optical properties of flower-like ZnO is investigated. The flower-like ZnO is composed of nanosheets. Annealing at 500°C results in the increase of the thickness of nanosheets and the enhancement of UV emission. PL spectra results show that the annealing atmosphere affects the visible emission band, which is sensitive to intrinsic and surface defects in the flower-like ZnO. The vibrational properties of the flower-like ZnO annealing in different atmospheres are characterized by Raman spectra.

Large-scale synthesis of flowerlike ZnO nanostructure by a simple chemical solution route and its gas-sensing property

“…Recently, wet chemical process without any catalyst or template has been employed to synthesize ZnO nanoflowers with nanorods [18][19][20][21][22][23][24][25][26] and ZnO nanoflowers with nanosheets [27][28][29][30][31]. For example, a large-scale flowerlike ZnO nanostructure assembled by many hexagonal-structured ZnO nanosheets was achieved in a relatively pure ethanol circumstance through a very simple solvothermal method [27].…”

“…For example, a large-scale flowerlike ZnO nanostructure assembled by many hexagonal-structured ZnO nanosheets was achieved in a relatively pure ethanol circumstance through a very simple solvothermal method [27]. Hou et al [28] prepared flowerlike ZnO constructed from nanosheets via a microemulsion method at room temperature. Zuo et al [29] synthesized flowerlike ZnO architectures with nanosheets through a very simple solvothermal method.…”

Highly Transparent Nano-Needle ZnO Prepared by Successive Ionic Layer Adsorption and Reaction Method

“…ZnO luminescence properties have been widely discussed [23][24][25][26][27][28][29]. The measured PL spectra are shown in Fig.…”

Synthesis of tunable 3D ZnO architectures assemblied with nanoplates

“…It is reported that the surface oxygen vacancies can work as electron acceptors and trap the photogenerated electrons temporarily to reduce the surface recombination of electrons and holes, and thus enhancing the photocatalytic activity [24]. The thickness of nanoplates determines that a large amount of surface defects occur [10], such as oxygen vacancies, which can possibly promote their photocatalytic activities. The peaks of photoluminescence from 440 to 600 nm in figure 5a originate from oxygen vacancies, which may prevent recombination of electrons and holes on the surface and give good photocatalytic activities.…”

“…Among these nanostructures, 3D self-assemblies have been a hot topic due to their peculiar and advanced applications [7][8][9][10]. For example, Wang et al used PCPAA (amphiphilic copolymer of dicyclopentadiene and acrylic acid) and PVP (polyvinylpyrrolidone) to control the nanocrystals aggregation to form ZnO nanoarchitectures which exhibited high surface area for the potential application in the areas of catalysts and sensors [9].…”