Tricolor flag-shaped nanobelt array and derivant 3D structures display concurrent conductive anisotropy, up-conversion fluorescence and magnetism

• Published in: Materials & design Vol. 211; p. 110121
• Main Authors: Liu, Xiaona, Xie, Yunrui, Yang, Liu, Qi, Haina, Ma, Qianli, Dong, Xiangting, Li, Dan, Liu, Guixia, Wang, Jinxian, Yu, Wensheng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2021; Elsevier
• Subjects: Anisotropic conductivity; Electrospinning; Fluorescence; Magnetism; Tricolor flag-shaped nanobelt; Tricolor flag-shaped nanobelt; Fluorescence; Electrospinning; Magnetism; Anisotropic conductivity
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2021.110121

[Display omitted] •Tricolor flag-shaped nanobelt and array are innovatively designed and prepared by electrospinning.•Tricolor flag-shaped nanobelt as building unit can microscopically realize three independent functional partitions and ensure excellent versatility of array.•Conductance ratio of conductive direction to insulating direction in array reaches 2.54 × 108 when mass percentage of polyaniline is 70%.•Novel 3D tubes and 3D + 2D complete banner-typed structures with similar multi-functionalities are derived by rolling the array. Unique-structured [NaYF4:Yb3+,Tm3+/polymethylmethacrylate (PMMA)]//[polyaniline (PANI)/PMMA]//[CoFe2O4/PMMA] fluorescent-conductive-magnetic tricolor flag-shaped nanobelt and array (marked as FCM-TNA) are innovatively designed and constructed by using tri-axial parallel electrospinning. Partition of three independent functional zones is microscopically realized in the tricolor flag-shaped nanobelt to avoid harmful mutual influences among three functions via confining luminescent, conductive and magnetic substances into their own domains, and thus achieving superior fluorescent-conductive-magnetic trifunction. Tricolor flag-shaped nanobelt used as building unit ensures excellent fluorescence, anisotropic conduction and magnetism of FCM-TNA. FCM-TNA emits blue fluorescence upon 980-nm laser excitation. Conductance ratio of conductive direction to insulating direction in FCM-TNA reaches 2.54 × 108 when the mass percentage of PANI to PMMA is settled at 70%, achieving high conductive anisotropy. By adjusting the contents of NaYF4:Yb3+,Tm3+ NPs, PANI and CoFe2O4 NPs, FCM-TNA exhibits tunable up-conversion fluorescence intensity, conductive anisotropy and magnetism. The formative mechanisms of tricolor flag-shaped nanobelt and FCM-TNA are advanced, and construction technologies are also established. Furthermore, neoteric 3D tubes and 3D + 2D complete banner-typed structures with similar multi-functionalities are derived from the FCM-TNA by using different construction strategies. The new design philosophy and technique can provide support for the design and construction of other new multifunctional anisotropic conductive materials in the future.