Characterization, Cathodoluminescence, and Field-Emission Properties of Morphology-Tunable CdS Micro/Nanostructures
Author(s)
Zhai, Tianyou
Fang, Xiaosheng
Bando, Yoshio
Dierre, Benjamin
Liu, Baodan
Zeng, Haibo
Xu, Xijin
Huang, Yang
Yuan, Xiaoli
Sekiguchi, Takashi
Golberg, Dmitri
Griffith University Author(s)
Year published
2009
Metadata
Show full item recordAbstract
High-quality, uniform one-dimensional CdS micro/nanostructures with different morphologies-microrods, sub-microwires and nanotips-are fabricated through an easy and effective thermal evaporation process. Their structural, cathodoluminescence and field-emission properties are systematically investigated. Microrods and nanotips exhibit sharp near-bandedge emission and broad deep-level emission, whereas sub-microwires show only the deep-level emission. A significant decrease in a deep-level/nearband-edge intensity ratio is observed along a tapered nanotip towards a smaller diameter part. This behavior is understood by ...
View more >High-quality, uniform one-dimensional CdS micro/nanostructures with different morphologies-microrods, sub-microwires and nanotips-are fabricated through an easy and effective thermal evaporation process. Their structural, cathodoluminescence and field-emission properties are systematically investigated. Microrods and nanotips exhibit sharp near-bandedge emission and broad deep-level emission, whereas sub-microwires show only the deep-level emission. A significant decrease in a deep-level/nearband-edge intensity ratio is observed along a tapered nanotip towards a smaller diameter part. This behavior is understood by consideration of defect concentrations in the nanotips, as analyzed with high-resolution transmission electron microscopy. Field-emission measurements show that the nanotips possess the best field-emission characteristics among all 1D CdS nanostructures reported to date, with a relatively low turn-on field of 5.28 V mm 1 and the highest field-enhancement factor of 4 819. The fieldenhancement factor, turn-on and threshold fields are discussed related to structure morphology and vacuum gap variations under emission.
View less >
View more >High-quality, uniform one-dimensional CdS micro/nanostructures with different morphologies-microrods, sub-microwires and nanotips-are fabricated through an easy and effective thermal evaporation process. Their structural, cathodoluminescence and field-emission properties are systematically investigated. Microrods and nanotips exhibit sharp near-bandedge emission and broad deep-level emission, whereas sub-microwires show only the deep-level emission. A significant decrease in a deep-level/nearband-edge intensity ratio is observed along a tapered nanotip towards a smaller diameter part. This behavior is understood by consideration of defect concentrations in the nanotips, as analyzed with high-resolution transmission electron microscopy. Field-emission measurements show that the nanotips possess the best field-emission characteristics among all 1D CdS nanostructures reported to date, with a relatively low turn-on field of 5.28 V mm 1 and the highest field-enhancement factor of 4 819. The fieldenhancement factor, turn-on and threshold fields are discussed related to structure morphology and vacuum gap variations under emission.
View less >
Journal Title
Advanced Functional Materials
Volume
19
Issue
15
Subject
Condensed Matter Characterisation Technique Development
Physical Sciences
Chemical Sciences
Engineering