化学
堆积
Atom(片上系统)
酞菁
石墨烯
纳米尺度
化学物理
平面度测试
碳化
吸附
碳纤维
纳米技术
催化作用
结晶学
物理化学
材料科学
复合材料
有机化学
复合数
嵌入式系统
计算机科学
作者
Lingxiao Wang,Jing Wang,Xiaoping Gao,Cai Chen,Yunli Da,Sicong Wang,Jia Yang,Zhiyuan Wang,Jia Song,Tao Yao,Wu Zhou,Huang Zhou,Yuen Wu
摘要
The orderly assembly of single atoms into highly periodic aggregates at the nanoscale is an intriguing but challenging process of high-precision atomic manufacturing. Here, we discover that an in-plane film surface shrinkage can induce molecular self-assembly to arrange single atoms with unconventional distribution, contributing them to periodic one-dimensional segregation on carbon stripes (one-dimensional single-atom arrays (SAA)). This originates from the fact that metal phthalocyanine (MPc) molecules gradually aggregate and melt to form a film under a thermal drive and the help of sodium chloride templates, accompanied by surface shrinkage, self-assembly, and deep carbonization. At the nanoscale, these periodic parallel arrays are formed due to MPc molecular interactions by π–π stacking. At the atomic scale, the single atoms are stabilized by the vertical phthalocyanine-derived multilayer graphene. This can significantly modify the electronic structure of the single-atom sites on the outermost graphene (e.g., Fe-based SAA), thus optimizing the adsorption energy of oxygen intermediates and resulting in a superior oxygen reduction reaction (ORR) performance concerning disordered single atoms. Our findings provide a general route for orderly single-atom manufacturing (e.g., Fe, Co, and Cu) and an understanding of the relationship between orderly allocation and catalytic performance.
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