Facile bottom-up synthesis of graphene nanofragments and nanoribbons by thermal polymerization of pentacenes
Facile bottom-up synthesis of graphene nanofragments and nanoribbons by thermal polymerization of pentacenes
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DOI：
10.1039/c2nr31893h
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发表时间：
2012-01-01
期刊：
影响因子：
6.7
通讯作者：
Kawasaki, Shinji
中科院分区：
文献类型：
--
作者：
Ishii, Yosuke;Song, Hayong;Kawasaki, Shinji
为了用简单的自下而上的方法制备具有特定结构的纳米石墨烯类分子(定义宽度的石墨烯纳米带或纳米碎片)，研究了五苯类化合物的热聚合反应。通过优化热处理温度和初始前驱体重量，成功地获得了至少长达八聚体的稠合并五苯分子(n=8)。这里的聚合度比已知的聚合并五苯体系(n=2，3)大得多。用拉曼光谱、X射线衍射和光致发光光谱对所得稠合五苯的结构和物理性质进行了表征。通过密度泛函理论计算，发现稠合并五苯体系具有独特的电子和磁性结构，这源于其特有的尺寸和边缘结构。此外，我们还进行了详细的质谱分析，研究了熔合机理。
To prepare nanosized graphene-like molecules of a defined structure (defined-width graphene nanoribbons or nanofragments) by a simple bottom-up method, thermal polymerization reactions of pentacenes were investigated. By optimizing heat treatment temperature and initial precursor weight, long-length fused pentacene molecules were successfully obtained at least up to octamer (n = 8). Here, the degree of polymerization was much larger than that of previously known polymerized pentacene systems (n = 2, 3). The structural and physical properties of the obtained fused pentacenes were characterized by Raman spectroscopy, X-ray diffraction, and photoluminescent spectroscopy. The fused pentacene system, examined using density functional theory calculations, was found to have unique electronic and magnetic structures originating from its characteristic size and edge structure. In addition, we performed detailed mass spectroscopic analysis that examined the fusing mechanism.