Fabrication and Field-Emission Performance of Zinc Sulfide Nanobelt Arrays

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• 作者：Fang Lu ; Weiping Cai ; Yugang Zhang ; Yue Li ; Fengqiang Sun ; Sung Hwan Heo ; Sung Oh Cho
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：September 13, 2007
• 年：2007
• 卷：111
• 期：36
• 页码：13385 - 13392
• 全文大小：1034K
• 年卷期：v.111,no.36(September 13, 2007)
• ISSN：1932-7455

文摘

Large-scale, well-aligned, and oriented wurtzite ZnS nanobelt arrays have been synthesized by a simpletemplate-free solvothermal reaction and subsequent heat-treatment process. The ZnS nanobelts grow alongthe [0001] direction perpendicularly on a zinc substrate, which have a thickness of about 30 nm, widths ofseveral hundreds of nanometers, and uniform length up to 4 m. The selection of Zn foil as the substrate iscrucial for the formation of ZnS nanostructured arrays. The concentration of Zn ions, the pH value in theinitial precursor solution, and the reaction temperature also have an important influence on the morphologyof the final arrays. The formation of the nanobelt arrays are attributed to the structural compatibility of thesubstrate with ZnS and the growth-rate-dependence of morphology. Importantly, such nanostructured arraysshow good field-emission properties with low turn-on fields (3.8 Vm^-1) and high field-enhancement factors(1839). This is attributed to the top edges and corners of the free-standing and well-aligned nanobelts, suitablenumber density of emitters, and good electric contact of the nanobelts with the conducting substrate wherethey grow. This well-aligned ZnS nanobelt array is expected to be the promising candidate for various field-emission applications, such as flat-panel displays and other vacuum microelectronic devices.