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Abstract
Open-shell radical meterials have received worldwide attention due to its potential application in highly efficient photothermal conversion field. However, it is still a challenge to enhance the chemical and photothermal stability of the open-shell small molecules and polymers. Herein, a stable open-shell oligo(3,4-dioxythiophene) radical PTTO2 was readily synthesized via simple BBr3-demethylation of the copolymer PTTOMe2 precursor prepared using cheap raw materials. The open-shell character of PTTO2 was carefully studied and confirmed via the signal-silent 1H-NMR spectrum, highly enhanced electron spin resonance signal comparing with PTTOMe2, as well as the ultral-wide UV-vis-NIR absorption and FTIR spectra and other technologies. Surprisingly, the powder of PTTO2 exhibit extremely wide absorption range from 300 to 2500 nm. The powder of PTTO2 can reach 274 ℃ under the same irradiation of 1.2 W cm-2, which is much higher 108 ℃ of the PTTOMe2. To date, PTTO2 stands as one of the low cost pure organic photothermal materials with super-high photothermal conversion performances.
Supplementary materials
Title
Open-shell Oligo(3,4-dioxythiophene) Radical: Synthesis and Photothermal Conversion Performance
Description
Open-shell radicals have received a lot of attention due to its potential applications in highly efficient photothermal conversion and therapy. However, it is challenging to enhance the stability of these open-shell structure. Herein, the copolymer PTTOMe2 and its demethylated product PTTO2 were prepared via simple reaction using relatively low-cost materials. Compared with the PTTOMe2, PTTO2 showed obvious ESR signal with the open-shell structure. The enhanced paramagnetic property of PTTO2 plays the key for its good photothermal conversion performance. Moreover, PTTO2 powder exhibited wide absorption range between 300-2500nm, which is comparable to the absorption range of widely-studied carbon black . The PTTO2 powder exhibited high photothermal conversion performance with temperature increase to 274 ℃ under 808nm laser irradiation of 1.2 W cm-2 for 60 s . These results stand out among the organic photothermal conversion materials and pave the way for the application of organic photothermal materials.
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