(3beta,7beta,12beta)-3,7,12-Trihydroxy-11,15,23-trioxolanost-8-en-26-oic acid
CAS Number:
98665-22-6
Molecular Formula:
C30H44O8
Negative thermal quenching of photoluminescence in annealed ZnO–Al2O3 core–shell nanorods
Literature Information
Publication Date
2014-12-12
DOI
10.1039/C4CP04998E
Impact Factor
3.676
Authors
Yukun Wu, Junwen Li, Huaiyi Ding, Zhiwei Gao, Yiming Wu, Nan Pan
View Original
Abstract
ZnO–Al2O3 core–shell nanorods (NRs) have been fabricated through the vapor phase condensation method and atomic layer deposition. It is found that the nanorod comprises a wurtzite single crystalline ZnO core with the main axes along the [0001] direction and an amorphous Al2O3 shell. The temperature-dependent photoluminescence (PL) properties of the as-grown and annealed ZnO/Al2O3 NRs are investigated systematically. The PL of the as-grown ZnO/Al2O3 NRs demonstrates a normal thermal quenching feature. However, the salient behavior of negative thermal quenching (NTQ), i.e., the increase in PL intensity with an increase in temperature, is clearly observed in the annealed ZnO/Al2O3 NRs. A multi-level model is adopted to account for this behavior and the thermal activation energy of the NTQ process is estimated to be ∼69 meV. Moreover, we suggest that the activation energy is related to the Al donor defect in ZnO resulting from the inter-diffusion between the ZnO core and the Al2O3 shell during the annealing process.
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Source Journal
Physical Chemistry Chemical Physics
CiteScore:
5.5
Self-citation Rate:
10.3%
Articles per Year:
3036
Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.
Recommended Compounds
1-Methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole
CAS Number:
1020174-04-2
Molecular Formula:
C10H17BN2O2
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