journal article
Open Access
Nov 25, 2022
Structure and Photoluminescence of WO3-x Aggregates Tuned by Surfactants
Abstract
The optoelectronic properties of transition metal oxide semiconductors depend on their oxygen vacancies, nanostructures and aggregation states. Here, we report the synthesis and photoluminescence (PL) properties of substoichiometric tungsten oxide (WO3-x) aggregates with the nanorods, nanoflakes, submicro-spherical-like, submicro-spherical and micro-spherical structures in the acetic acid solution without and with the special surfactants (butyric or oleic acids). Based on theory on the osmotic potential of polymers, we demonstrate the structural change of the WO3-x aggregates, which is related to the change of steric repulsion caused by the surfactant layers, adsorption and deformation of the surfactant molecules on the WO3-x nanocrystals. The WO3-x aggregates generate multi-color light, including ultraviolet, blue, green, red and near-infrared light caused by the inter-band transition and defect level-specific transition as well as the relaxation of polarons. Compared to the nanorod and nanoflake WO3-x aggregates, the PL quenching of the submicro-spherical-like, submicro-spherical and micro-spherical WO3-x aggregates is associated with the coupling between the WO3-x nanoparticles and the trapping centers arising from the surfactant molecules adsorbed on the WO3-x nanoparticles.
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Metrics
12
Citations
48
References
Details
- Published
- Nov 25, 2022
- Vol/Issue
- 13(12)
- Pages
- 2075
- License
- View
Authors
Funding
National Natural Science Foundation of China
Award: 12175141
National Key Research and Development Program of China
Award: 12175141
Natural Science Foundation of Shanghai
Award: 12175141
Slovenian Research Agency (ARRS)
Award: 12175141
Australian Research Council and QUT Centre for Materials Science
Award: 12175141
Slovenia-China Bilateral grant BI-CN
Award: 12175141
Cite This Article
Biben Wang, Xiaoxia Zhong, Haiyan Xu, et al. (2022). Structure and Photoluminescence of WO3-x Aggregates Tuned by Surfactants. Micromachines, 13(12), 2075. https://doi.org/10.3390/mi13122075
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