NIR-II Organic Photothermal Cocrystals with Strong Charge Transfer Interaction for Flexible Wearable Heaters  

作　　者：Dong Zhang Shuyu Li Shaosong Gao Siyao Fu Kexin Liu Dan He Huapeng Liu Xiaotao Zhang Wenping Hu 

机构地区：[1]Key Laboratory of Organic Integrated Circuit,Ministry of Education&Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,Institute of Molecular Aggregation Science,Tianjin University,Tianjin,300072 China [2]Key Laboratory of Organic Integrated Circuits,Ministry of Education&Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,School of Science,Tianjin University,Tianjin,300072 China [3]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou,Fujian,350207 China [4]College of Chemistry and Chemical Engineering,Central South University,Changsha,Hunan,410083 China

出　　处：《Chinese Journal of Chemistry》2024年第14期1563-1570,共8页中国化学（英文版）

基　　金：the National Key R&D Program(2022YFB3603800);the National Natural Science Foundation of China(52121002,U21A6002);Tianjin Natural Science Foundation(20JCJQJC00300);the Fundamental ResearchFunds forthe Central Universities.

摘　　要：The organic cocrystal strategy has provided a convenient and efficient platform for preparing organic photothermal materials.However,the rapidly directional preparation of cocrystals with desirable photothermal properties remains challenging due to a lack of suitable design ideas.Here,two new photothermal cocrystals,MTC and MFC,based on acceptor molecules(TCNQ and F4TCNQ)with different electron-withdrawing capacities were quickly prepared by the coprecipitation method,aiming to explore the effect of charge transfer(CT)interaction on photothermal properties.Compared with MTC,the stronger intermolecular CT interaction in MFC facilitates extending the absorption range(from the NIR-I to the NIR-II region)and enhancing the non-radiative transition process.Under the 808 nm laser irradiation,the photothermal conversion efficiency(PCE)of MFC is 54.6%,whereas MTC displays a mere 36.8%.The MFC cocrystal was further combined with a flexible polymer substrate(HPDMS)to prepare a flexible wearable heater(HPDMS@MFC),which exhibits excellent NIR-II photothermal performance.This work points out a research direction for the rapid assembly of efficient photothermal cocrystals and additionally provides an extensive application prospect for organic photothermal cocrystals in the field of wearable devices.

关 键 词：Organic photothermal cocrystals Charge transfer NiR-II region Density functional calculations Flexible wearable heaters Crystal engineering Orbital hybridization Fluorides 

分 类 号：TB30[一般工业技术—材料科学与工程]