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Nanoconfinement of tetraphenylethylene in zeolitic metal-organic framework for turn-on mechanofluorochromic stress sensing

DOI: 10.1016/j.apmt.2022.101434 DOI Help

Authors: Yang Zhang (University of Oxford) , Tao Xiong (University of Oxford) , Annika F. Moeslein (University of Oxford) , Samraj Mollick (University of Oxford) , Vishal Kachwal (University of Oxford) , Arun Singh Babal (University of Oxford) , Nader Amin (University of Oxford) , Jin-Chong Tan (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Materials Today , VOL 27

State: Published (Approved)
Published: June 2022
Diamond Proposal Number(s): 25407

Abstract: Mechanofluorochromic materials are of great significance for the fabrication of innovative sensors and optoelectronics. However, efficient mechanofluorochromic materials are rarely explored due to the deficiency of existing design strategies. Here, we demonstrate the incarceration of aggregation-induced emission (AIE) materials within metal-organic framework (MOF) single crystals to construct a composite system with turn-on mechanofluorochromism. A new type of AIE@MOF material was designed: integrating a zeolitic MOF (ZIF-71) and tetraphenylethylene (TPE, a topical AIE material) to generate a TPE@ZIF-71 system with exceptional turn-on type mechanofluorochromism. Using terahertz vibrational spectroscopy, we show the unique fluorochromism mainly emanates from the enhanced nanoconfinement effect exerted by ZIF-71 host on TPE guest under pressure. Compared with pure TPE, we demonstrate the nanoconfinement in AIE@MOF not only changes the TPE's turn-off type sensing behavior to a turn-on type, but boosts the original sensitivity markedly by tenfold. Significantly, because ZIF-71 prevents the spontaneous recrystallization of TPE upon unloading, this allows TPE@ZIF-71 to record the stress history. This is the first demonstration of the Guest@MOF system combining the concepts of AIE and MOF; its promising properties and potential engineering applications will stimulate new directions pertaining to luminescent stress sensors and smart optics.

Journal Keywords: Aggregation-induced emission (AIE); Metal-organic framework (MOF); Turn-on mechanofluorochromism; Guest@MOF; Photonic pressure sensor

Subject Areas: Materials, Chemistry


Instruments: B22-Multimode InfraRed imaging And Microspectroscopy

Added On: 16/03/2022 08:31

Discipline Tags:

Chemistry Materials Science Metal-Organic Frameworks Metallurgy Organometallic Chemistry

Technical Tags:

Spectroscopy Infrared Spectroscopy Synchtron-based Fourier Transform Infrared Spectroscopy (SR-FTIR)