谢尔宾斯基三角分形结构的STM研究

doi:10.3866/PKU.WHXB201511261

CORC > 北京大学 > 化学与分子工程学院

	谢尔宾斯基三角分形结构的STM研究; Sierpi(n)ski Triangle Fractal Structures Investigated by STM
	顾高臣 ; 李娜 ; 张雪 ; 侯士敏 ; 王永锋 ; 吴凯
刊名	物理化学学报
	2016
关键词	分形谢尔宾斯基三角形分子自组装表面科学扫描隧道显微镜 Fractal Sierpi(n)ski triangles Self-assembly Surface science Scanning tunneling microscopy METAL-ORGANIC FRAMEWORK SIERPINSKI-TRIANGLE COMPLEXES DESIGN SIZE
DOI	10.3866/PKU.WHXB201511261
英文摘要	分形结构因其特殊的数学和美学意义受到科学家们长期以来的广泛关注.化学家更是试图利用共价键和配位键等来合成各类分子分形结构,但由于溶解性的限制,始终无法实现高级别、无缺陷的分子分形结构的构筑.最近我们采用超高真空表面制备方法,成功获得了基于卤键与配位键的谢尔宾斯基三角分形结构,并使用扫描隧道显微镜(STM)对其生长机制进行了研究.4,4'''-二溴-1,1'∶3',1''4”,1'''-四联苯分子在Ag(111)表面通过自组装形成了一系列无缺陷卤键分形结构.由于卤键作用较弱,该结构只能稳定在液氮温度以下.在Au(111)表面共沉积4,4''-二氰基-1,1'∶3',1''-三联苯分子与铁原子可以制备出更稳定的配位分形结构.密度泛函理论计算揭示了分形结构的成像机制.蒙特卡洛计算表明,表面三节点的形成对谢尔宾斯基三角分形结构的生长具有重要意义.; Self-similar fractals have been extensively investigated because of their importance in mathematics and aesthetics. Chemists have attempted to synthesize various molecular fractal structures through sophisticated design. But because of poor solubility, synthesis of defect-free fractals with large sizes in solution usually proves difficult. Recently, we reported the formation of extended and defect-free Sierpinski triangle fractals by halogen or coordination bonds on surfaces under ultrahigh vacuum conditions. Their growth mechanism has been systematically studied by scanning tunneling microscopy. Using.4,4--dibromo1,1':3',1":4",1"'-quaterphenyl molecules, a series of Sierpinski triangles were successfully prepared on Ag(111) through self-assembly. A slow cooling rate is crucial for growing fractals of higher order. These fractals are only observed below liquid-nitrogen temperature because of the weak interactions in halogen bonds. More stable metal-organic Sierpinski triangles were fabricated by depositing 4,4"-dicyano-1,1':3',1"-terphenyl molecules and Fe atoms on Au(111) and annealing at around 100 degrees C for 10 min. The fractals are stabilized through coordination interaction between Fe atoms and N atoms in molecules. Density functional theory calculations revealed their imaging mechanism. Monte Carlo simulations displayed the formation process of surface-supported fractal structures. Three-fold nodes are believed to dominate the structure formation of Sierpinski triangles.; The project was supported by the National Natural Science Foundation of China; National Key Basic Research Program of China (973); Specialized Research Fund for the Doctoral Program of Higher Education,China (20130001110029).国家自然科学基金; 国家重点基础研究发展规划项目(973); 高等学校博士学科点专项科研基金; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); smhou@pku.edu.cn; yongfengwang@pku.edu.cn; kaiwu@pku.edu.cn; 1; 195-200; 32
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438790]
专题	化学与分子工程学院信息科学技术学院
推荐引用方式 GB/T 7714	顾高臣,李娜,张雪,等. 谢尔宾斯基三角分形结构的STM研究, Sierpi(n)ski Triangle Fractal Structures Investigated by STM[J]. 物理化学学报,2016.
APA	顾高臣,李娜,张雪,侯士敏,王永锋,&吴凯.(2016).谢尔宾斯基三角分形结构的STM研究.物理化学学报.
MLA	顾高臣,et al."谢尔宾斯基三角分形结构的STM研究".物理化学学报 (2016).