Flexible Free-Standing Luminescent Two-Component Fiber Films with Tunable Hierarchical Structures Based on Hydrogen-Bonding Architecture

Abstract

Although the fabrication of hierarchical architectures with highly ordered functional units is of great importance for both fundamental science and practical application, the development of one-dimensional (1D) organic hierarchical micro/nanostructures based on low-molecular-weight (LMW) building blocks remains at an early stage. Herein, we report two types of micro/nanoscaled multicomponent fluorescent fiber systems with tunable hierarchical morphologies through a one-step coassembly process. With the aid of hydrogen-bonding motifs, LMW precursors (1,4-bis(5-phenyloxazol-2-yl)benzene (A) and two coassembled building blocks: 4-bromotetrafluorobenzene carboxylic acid (B) and 2,3,4,5,6-pentafluorophenol (C)) have been self-organized into fibers and flexible free-standing films, which show hierarchical micro/nanostructures as well as tunable one-/two-photon luminescence. The disassembly of the multicomponent A.B and A.C fibers occurs at high temperature, which further alters the luminescence properties of the multicomponent materials. Therefore, this work provides a facile wet chemical route for fabricating multicomponent LMW self-assembled fibers and free-standing film systems with tunable hierarchical structures and photoemission behaviors, and such self-organized systems may have potential applications in fields of two-photon luminescence and thermal sensors.

Luminescent and Transparent Nanopaper Based on Rare-Earth Up-Converting Nanoparticle Grafted Nanofibrillated Cellulose Derived from Garlic Skin

“…Transparent NFC nanopaper with native cellulose nanofibrils as a free-standing skeleton can not only match the desirable ecofriendly sustainability but also introduce new properties such as low thermal expansion, excellent optical and mechanical properties, printability, and enhanced flexibility that can even permit fully folding. − On the basis of the predominant advantages, the functionalized NFC hybrid nanopaper has received growing interest in the view of exciting characteristics of conductive, fluorescent, and magnetic properties. − The intriguing application prospects of combining with luminescent materials make it an emerging research area and gather significant attention to security printing, chemical sensors, and heavy metal ion probes. − For instance, it will act as a lightweight substrate for multilayer covert taggant, bonded with fluorescent dye, to enhance the commercial and forensic security level, and it can also be designed as an alternative for portable oxygen sensor by using UCNPs to photoexcite a quenchable probe for oxygen . Furthermore, the combination of NFC nanopaper and BODIPY-rhodamine is achievable to be developed as a new-fashioned “off–on” ratiometric probe system to selectively detect Hg 2+ ions on the ppb scale …”

Morphologies and Properties of PET Nano Porous Luminescence Fiber: Oil Absorption and Fluorescence-Indicating Functions

“…To verify the fluorescence-indicating functions of PNPLF with different oil adsorbing values, the PNPLF samples with different oil adsorbing values were prepared. − The fluorescence emission spectra, fluorescence lifetimes, and quantum efficiencies were tested. Figures and give the fluorescence emission spectra and decay curves of the PNPLF samples with different oil adsorbing values.…”

Biocompatible Photoluminescent Silk Fibers with Stability and Durability

“…The green and mild fabrication process can remain the mechanical and biocompatible property of TPCA@SF as that of original silk fibers. The photoluminescent silk fibers exhibited good cytocompatibility, and can be implanted subcutaneously for bioimaging, enriching previous methods for fabricating fluorescent fiber-based materials such as films 50,51 and nanofibers. 52 The present strategy can also be extended to other protein-based materials for fabricating various biocompatible photoluminescent substances, such as gel, film, fibers, and sponge.…”