TITLE Bionic Regulators Break the Ecological Niche of Pathogenic Bacteria for Modulating Dysregulated Microbiome in Colitis
AUTHOR Jiali Yang,Guizhen Zhang,Mengyun Peng,Shaochong Tan,Shengchan Ge,Xinyuan Yang,Yan Liang,Zhiyang Wen,Li Xie,Tonghai Zhou,Sixuan Wu,Jingyi An,Yifei Wang,Wei Liu,Kaixiang Zhang,Zhenzhong Zhang,Junjie Liu,Jinjin Shi
YEAR 2022
JOURNAL Advanced functional materials

Largely soluble tris(pentafluorophenyl)borane (BCF) has recently emerged as a promising molecular dopant for preparing highly conductive organic thermo- electrics (TEs) using a one-step solution-mixing method. However, the unique doping mechanisms that include both undesirable Lewis acid doping with BCF and effective Brønsted acid doping with BCF–water complexes limit its widespread applications. Herein, the feasibility of modulating the two doping mechanisms by utilizing the competitive Lewis acid–base interactions of BCF with H2O or Lewis basic groups in conjugated polymers is demonstrated. The polymer without strong Lewis basic groups undergoes Brønsted acid doping, which efficiently forms delocalized free charge carriers and leads to superior TE power factors and figures of merit of 49.6 µW m−1 K−2 and 0.061, respec- tively. However, the polymer with strong Lewis basic groups undergoes both doping mechanisms competitively. BCF–polymer Lewis complexes not only generate free charge carriers inefficiently, but also hinder possible Brønsted acid doping and localize charge carriers, significantly lowering the TE proper- ties. Nevertheless, the reduced TE properties can be dramatically improved by thermally annealing the predoped polymer films because Lewis acid doping can be substantially replaced by Brønsted acid doping owing to the different thermal stabilities between the BCF–polymer and BCF–water complexes.

KEYWORDS controllable doping, donor–acceptor polymers, molecular doping, organic thermoelectrics, tris(pentafluorophenyl)borane
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