Room-temperature excitonic emission with a phonon replica from graphene nanosheets deposited on Ni-nanocrystallites/Si-nanoporous pillar array
Graphene nanosheets (GNSs) were grown on a Si nanoporous pillar array (Si-NPA) via chemical vapour deposition, using a thin layer of pre-deposited Ni nanocrystallites as catalyst. GNSs were determined to be of high quality and good dispersivity, with a typical diameter size of 15 × 8 nm. Light absor...
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| Format: | Article |
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The Royal Society
2018-01-01
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| Series: | Royal Society Open Science |
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| Online Access: | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.172238 |
| _version_ | 1818116469787983872 |
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| author | Zhaojun Tang Tingting Xu Sen Li Zhifeng Shi Xinjian Li |
| author_facet | Zhaojun Tang Tingting Xu Sen Li Zhifeng Shi Xinjian Li |
| author_sort | Zhaojun Tang |
| collection | DOAJ |
| description | Graphene nanosheets (GNSs) were grown on a Si nanoporous pillar array (Si-NPA) via chemical vapour deposition, using a thin layer of pre-deposited Ni nanocrystallites as catalyst. GNSs were determined to be of high quality and good dispersivity, with a typical diameter size of 15 × 8 nm. Light absorption measurements showed that GNSs had an absorption band edge at 3.3 eV. They also showed sharp and regular excitonic emitting peaks in the ultraviolet and visible region (2.06–3.6 eV). Moreover, phonon replicas with long-term stability appeared with the excitonic peaks at room temperature. Temperature-dependent photoluminescence from the GNSs revealed that the excitonic emission derived from free and bound excitonic recombination. A physical model based on band energy theory was constructed to analyse the carrier transport of GNSs. The Ni nanocrystallites on Si-NPA, which acted as a metal-enhanced fluorescence substrate, were supposed to accelerate the excitonic recombination of GNSs and enhanced the measured emission intensity. Results of this study would be valuable in determining the luminescence mechanism of GNSs and could be applied in real-world optoelectronic devices. |
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| issn | 2054-5703 |
| language | English |
| last_indexed | 2024-12-11T04:23:01Z |
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| spelling | doaj.art-f23e378fc7fe4a41bc9b28ec3af90da72022-12-22T01:21:04ZengThe Royal SocietyRoyal Society Open Science2054-57032018-01-015810.1098/rsos.172238172238Room-temperature excitonic emission with a phonon replica from graphene nanosheets deposited on Ni-nanocrystallites/Si-nanoporous pillar arrayZhaojun TangTingting XuSen LiZhifeng ShiXinjian LiGraphene nanosheets (GNSs) were grown on a Si nanoporous pillar array (Si-NPA) via chemical vapour deposition, using a thin layer of pre-deposited Ni nanocrystallites as catalyst. GNSs were determined to be of high quality and good dispersivity, with a typical diameter size of 15 × 8 nm. Light absorption measurements showed that GNSs had an absorption band edge at 3.3 eV. They also showed sharp and regular excitonic emitting peaks in the ultraviolet and visible region (2.06–3.6 eV). Moreover, phonon replicas with long-term stability appeared with the excitonic peaks at room temperature. Temperature-dependent photoluminescence from the GNSs revealed that the excitonic emission derived from free and bound excitonic recombination. A physical model based on band energy theory was constructed to analyse the carrier transport of GNSs. The Ni nanocrystallites on Si-NPA, which acted as a metal-enhanced fluorescence substrate, were supposed to accelerate the excitonic recombination of GNSs and enhanced the measured emission intensity. Results of this study would be valuable in determining the luminescence mechanism of GNSs and could be applied in real-world optoelectronic devices.https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.172238graphene nanosheetphotoluminescenceexcitonic emissionphonon replica |
| spellingShingle | Zhaojun Tang Tingting Xu Sen Li Zhifeng Shi Xinjian Li Room-temperature excitonic emission with a phonon replica from graphene nanosheets deposited on Ni-nanocrystallites/Si-nanoporous pillar array Royal Society Open Science graphene nanosheet photoluminescence excitonic emission phonon replica |
| title | Room-temperature excitonic emission with a phonon replica from graphene nanosheets deposited on Ni-nanocrystallites/Si-nanoporous pillar array |
| title_full | Room-temperature excitonic emission with a phonon replica from graphene nanosheets deposited on Ni-nanocrystallites/Si-nanoporous pillar array |
| title_fullStr | Room-temperature excitonic emission with a phonon replica from graphene nanosheets deposited on Ni-nanocrystallites/Si-nanoporous pillar array |
| title_full_unstemmed | Room-temperature excitonic emission with a phonon replica from graphene nanosheets deposited on Ni-nanocrystallites/Si-nanoporous pillar array |
| title_short | Room-temperature excitonic emission with a phonon replica from graphene nanosheets deposited on Ni-nanocrystallites/Si-nanoporous pillar array |
| title_sort | room temperature excitonic emission with a phonon replica from graphene nanosheets deposited on ni nanocrystallites si nanoporous pillar array |
| topic | graphene nanosheet photoluminescence excitonic emission phonon replica |
| url | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.172238 |
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