Branched Artificial Nanofinger Arrays by Mesoporous Interfacial Atomic Rearrangement

Biao Kong, Jing Tang, Yueyu Zhang, Cordelia Selomulya, Xingao Gong, Yang Liu, Wei Zhang, Jianping Yang, Wenshou Wang, Xiaotian Sun, Yufei Wang, Gengfeng Zheng, Dongyuan Zhao

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


The direct production of branched semiconductor arrays with highly ordered orientation has proven to be a considerable challenge over the last two decades. Here we report a mesoporous interfacial atomic rearrangement (MIAR) method to directly produce highly crystalline, finger-like branched iron oxide nanoarrays from the mesoporous nanopyramids. This method has excellent versatility and flexibility for heteroatom doping of metallic elements, including Sn, Bi, Mn, Fe, Co, Ni, Cu, Zn, and W, in which the mesoporous nanopyramids first absorb guest-doping molecules into the mesoporous channels and then convert the mesoporous pyramids into branching artificial nanofingers. The crystalline structure can provide more optoelectronic active sites of the nanofingers by interfacial atomic rearrangements of doping molecules and mesopore channels at the porous solid-solid interface. As a proof-of-concept, the Sn-doped Fe2O3 artificial nanofingers (ANFs) exhibit a high photocurrent density of ∼1.26 mA/cm2, ∼5.25-fold of the pristine mesoporous Fe2O3 nanopyramid arrays. Furthermore, with surface chemical functionalization, the Sn-doped ANF biointerfaces allow nanomolar level recognition of metabolism-related biomolecules (∼5 nm for glutathione). This MIAR method suggests a new growth means of branched mesostructures, with enhanced optoelectronic applications.

Original languageEnglish
Pages (from-to)4260-4266
Number of pages7
JournalJournal of The American Chemical Society
Issue number12
Publication statusPublished - 1 Apr 2015


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