| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Enhanced Field Emission from Large-Area Arrays of W18O49 Pencil-Like Nanostructure |
LI Zheng-Lin, DENG Shao-Zhi, XU Ning-Sheng, LIU Fei, CHEN Jun |
| State Key Lab of Optoelectronic Materials and Technologies, and Guangdong Province Key Laboratory of Display Material and Technology, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275 |
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| Cite this article: |
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LI Zheng-Lin, DENG Shao-Zhi, XU Ning-Sheng et al 2010 Chin. Phys. Lett. 27 068504 |
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Abstract Field enhancement and field screening are two major factors affecting field emission performance of arrays of quasi one-dimensional nanostructures. We have observed enhanced field emission from large-area arrays of W18O49 pencil-like nanostructure due to both the effects of high aspect ratio and enlarged spacing between neighboring nanostructures. These arrays may be grown on silicon substrates by the multi-step thermal evaporation process. The spacing of nanotip-to-nanotip between neighboring nanostructures may be increased by adjusting the growth temperature. The arrays are observed to have a typical turn-on field as low as about 1.26 MV/m and a threshold field as low as about 3.39 MV/m, resulting in increasing field enhancement and decreasing field screening effect.
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| Keywords:
85.45.Db
81.07.-b
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Received: 09 February 2010
Published: 25 May 2010
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| PACS: |
85.45.Db
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(Field emitters and arrays, cold electron emitters)
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81.07.-b
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(Nanoscale materials and structures: fabrication and characterization)
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