Ultrasensitive Fe3+ luminescence sensing and supercapacitor performances of a triphenylamine-based TbIII-MOF

• Published in: Journal of solid state chemistry Vol. 282; p. 121083
• Main Authors: Xia, Zhengqiang, Ren, Chongting, Xu, Wenfeng, Li, Feng, Qiao, Chengfang, Wei, Qing, Zhou, Chunsheng, Chen, Sanping, Gao, Shengli
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.02.2020
• Subjects: Lanthanide; Luminescence sensing; Supercapacitor; Supercapacitor; Lanthanide; Luminescence sensing
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2019.121083

The reasonable selection of functional ligands and active metal centers is a priority to fabricate multifunctional metal-organic framework (MOF) materials. Herein, a 3D bifunctional TbIII-MOF, [Tb(TCBPA)∙DMF]n (1) (H3TCBPA ​= ​tris(4′-carboxybiphenyl)amine), is constructed by photoelectricity active triarylamine chromophore and Tb(III) to show excellent photochemical sensing and supercapacitor performances. In 1, the TCBPA3− linkers bridge Tb(III) nodes in a highly torsional fashion to form a non-interpenetrating structure containing 1D rhombic channels with an effective window size of 10.6 ​× ​11.4 ​Å2. The strong green emission and multiple nitrogen/oxygen active sites make 1 work as a reusable heterogeneous fluorescent sensor for ultrasensitive detection of Fe3+ ion with a low detection limit of 3.56 ​ppb. Electrochemical experiments show that the TbIII-MOF exhibits a high specific capacitance of 346 ​F ​g−1 ​at 1 ​A ​g−1 and a remarkable capacitance retention of 93% after 2000 cycles, suggesting outstanding long-term cycling stability and reversibility. Additionally, the possible Fe3+ sensing mechanism was also investigated systematically. [Display omitted] •A new 3D triphenylamine-based bifunctional TbIII-MOF was synthesized and characterized.•TbIII-MOF exhibits bright green luminescence with a 5D4 lifetime of 864.09 μs.•TbIII-MOF can work as an excellent fluorescent sensor for ultrasensitive detection of Fe3+ ion.•TbIII-MOF shows high specific capacitance, remarkable cycling stability and reversibility.