先驱体热解制备富硼、氮BCN化合物及其发光性能研究

doi:10.3724/SP.J.1077.2009.00013

摘要/Abstract

摘要： 以三聚氰胺和硼酸为原料，在水溶液中反应合成出纤维状C₃N₆ H₆(H₃BO₃)₂先驱体，通过使其在高温氮气氛下热解制备出了富硼、氮BCN化合物.利用XRD、FT-IR、XPS、SEM、HRTEM等对热解产物进行了表征，采用FS测量了热解产物的室温光致发光光谱，研究了热解温度对产物及其光致发光性能的影响.结果表明，1000℃以上热解均可制备出乱层石墨结构富硼、氮BCN化合物.随热解温度的升高，BCN化合物中的B、N含量逐渐增大，C含量逐渐减小.BCN化合物的晶体形状为棒状或纤维状，由相互交织的平均直径在2nm左右的纳米纤维构成.这些BCN化合物均为宽带隙半导体，在340~450nm和670~705nm出现了两个很强的呈明显宽化的光致发光峰，且随热解温度的升高，短波长的发射峰波长基本呈逐渐减小的变化趋势.

关键词: BCN化合物, 富硼、氮, 热解, 光致发光

Abstract: C₃N₆H₆(H₃ BO₃)₂ precursor was synthesized with C₃N₆H₆and H₃BO₃ as raw materials in aqueous solution, which was followed by pyrolysis at high temperature in flowing N₂ atmosphere to prepare (boron and nitrogen)-rich BCN compounds. The pyrolysis products were characterized by FTIR, XRD, XPS, SEM and HRTEM. The room-temperature photoluminescence(PL) spectra of the pyrolysis products were measured by fluorescence spectrometry. Effect of pyrolysis temperature on the pyrolysis products and their photoluminescence were investigated. The results indicate that (boron and nitrogen)-rich BCN compounds with turbostratic graphite structure can be obtained when the pyrolysis temperature is above 1000℃. With the increase of pyrolysis temperature, the contents of B and N in the BCN compounds increase whereas the content of C decreases. These BCN compounds show bar-like or fibrous morphologies similar to the precursor. HRTEM analysis reveals that these BCN compounds are composed of interweaved nanofibers with average diameter of ca.2nm. PL results indicate that these BCN compounds are semiconductors with two strong and broad PL peaks centered at 340-450nm and 670-705nm. With the increase of pyrolysis temperature, the wavelength of the peak centered in the shorter wavelength range decreases due to the variation of the chemical composition. 

Key words: BCN compounds, (boron and nitrogen)-rich, pyrolysis, photoluminescence

中图分类号:

杨建,丘泰,沈春英,潘丽梅. 先驱体热解制备富硼、氮BCN化合物及其发光性能研究[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2009.00013.

YANG Jian,QIU Tai,SHEN Chun-Ying,PAN Li-Mei. Photoluminescence of (Boron and Nitrogen)-rich BCN Compounds Pyrolysed from Precursor[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00013.

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