Ni(NO3)2-Assisted Catalytic Synthesis and Photoluminescence Property of Ultralong Single Crystal Sialon Nanobelts

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• 作者：Juntong Huang ; Yan鈥檊ai Liu ; Zhaohui Huang ; Minghao Fang ; Shaowei Zhang ; Wei Xie ; Jingzhou Yang ; Saifang Huang ; Youguo Xu
• 刊名：Crystal Growth & Design
• 出版年：2013
• 出版时间：January 2, 2013
• 年：2013
• 卷：13
• 期：1
• 页码：10-14
• 全文大小：440K
• 年卷期：v.13,no.1(January 2, 2013)
• ISSN：1528-7505

文摘

Ultralong single crystal Sialon nanobelts were prepared on a graphite cover coated with Ni(NO₃)₂ by facile thermal chemical vapor deposition reactions of Si, Al, and Al₂O₃ with flowing N₂ at 1450 掳C. The as-synthesized Sialon nanobelts were up to several millimeters long and several hundred nanometers wide, and they had width/thickness ratios of 5鈥?5. Their growth process was codominated by a Ni-catalytic vapor鈥搇iquid鈥搒olid (VLS) base-growth mechanism and a vapor鈥搒olid (VS) tip-growth mechanism. The former was responsible for the initial nucleation and proto-nanobelt formation of Sialon and the subsequent growth along the [100] direction, and the latter additionally contributed the growth at tips. The room-temperature photoluminescence (PL) spectrum showed that the as-synthesized Sialon nanobelts had a special emission with two maximum peaks at 409 nm (3.03 eV) and 428 nm (2.90 eV) located in the violet-blue spectral range, making possible potential applications in LED and optoelectronic nanodevices.