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Environmental Stimuli‐Irresponsive Long‐Term Radical Scavenging of 2D Transition Metal Dichalcogenides through Defect‐Mediated Hydrogen Atom Transfer in Aqueous Media
Author(s) -
Kim Ji Eun,
Yim DaBin,
Lee Chi Ho,
Jun Byeongsun,
Nam Jin,
Han Sang Hoon,
Lee Sang Uck,
Kim JongHo,
Kim Jin Woong
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201802737
Subject(s) - materials science , scavenging , oxide , aqueous solution , hydrogen atom , amphiphile , dissociation (chemistry) , transition metal , ethylene oxide , hydrogen , metal , chemical engineering , photochemistry , atom (system on chip) , chalcogen , nanotechnology , copolymer , organic chemistry , catalysis , alkyl , chemistry , metallurgy , polymer , composite material , computer science , embedded system , engineering , antioxidant
A transition metal dichalcogenide (TMD) based antioxidation platform is proposed, in which radical scavenging is accomplished by the defect‐mediated one‐step hydrogen atom transfer (HAT) occurring on the nanosheets in water. To this end, the TMD nanosheets, including MoS 2 , WS 2 , MoSe 2 , and WSe 2 , are finely dispersed in water with the aid of an amphiphilic poly(ε‐caprolactone)‐ b ‐poly(ethylene oxide) (PCL‐ b ‐PEO) diblock copolymer that envelops the nanosheets with a molecular layer of less than 1 nm thickness. It is then demonstrated that the PCL‐ b ‐PEO‐stabilized TMD nanosheets show the extraordinarily enhanced and prolonged radical scavenging activity in water even under harsh storage conditions. Theoretical modeling studies on HAT suggest that more favorable hydrogen association from chalcogen vacancies on the nanosheets dispersed in water can lead to the easier dissociation of hydrogen atoms with exothermicity by −0.43 to −1.33 eV, thus exhibiting such an outstanding radical scavenging performance.