Simple and Versatile Platform for Air-Tolerant Photon Upconverting Hydrogels by Biopolymer-Surfactant-Chromophore Co-assembly

Pankaj Bharmoria, Shota Hisamitsu, Hisanori Nagatomi, Taku Ogawa, Masa Aki Morikawa, Nobuhiro Yanai, Nobuo Kimizuka

    研究成果: Contribution to journalArticle査読

    39 被引用数 (Scopus)

    抄録

    Exploration of triplet-triplet annihilation based photon upconversion (TTA-UC) in aqueous environments faces difficulty such as chromophores insolubility and deactivation of excited triplets by dissolved oxygen molecules. We propose a new strategy of biopolymer-surfactant-chromophore coassembly to overcome these issues. Air-stable TTA-UC with a high upconversion efficiency of 13.5% was achieved in hydrogel coassembled from gelatin, Triton X-100 and upconverting chromophores (triplet sensitizer and emitter). This is comparable to the highest UC efficiency observed to date for air-saturated aqueous UC systems. Moreover, this is the first example of air-stable TTA-UC in the form of hydrogels, widening the applicability of TTA-UC in biological applications. The keys are two-fold. First, gelatin and the surfactant self-assemble in water to give a developed hierarchical structure with hydrophobic domains which accommodate chromophores up to high concentrations. Second, thick hydrogen-bonding networks of gelatin backbone prevent O2 inflow to the hydrophobic interior, as evidenced by long acceptor triplet lifetime of 4.9 ms. Air-stable TTA-UC was also achieved for gelatin with other nonionic surfactants (Tween 80 and Pluronic f127) and Triton X-100 with other gelling biopolymers (sodium alginate and agarose), demonstrating the versatility of current strategy.

    本文言語英語
    ページ(範囲)10848-10855
    ページ数8
    ジャーナルJournal of the American Chemical Society
    140
    34
    DOI
    出版ステータス出版済み - 8 29 2018

    All Science Journal Classification (ASJC) codes

    • 触媒
    • 化学 (全般)
    • 生化学
    • コロイド化学および表面化学

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