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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

Title
Environmental Stimuli-Irresponsive Long-Term Radical Scavenging of 2D Transition Metal Dichalcogenides through Defect-Mediated Hydrogen Atom Transfer in Aqueous Media
Author
김종호
Keywords
amphiphilic block copolymers; hydrogen transfer; radical scavenging; transition metal dichalcogenide nanosheets
Issue Date
2018-09
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, v. 28, No. 44, Article no. 1802737
Abstract
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 MoS2, WS2, MoSe2, and WSe2, are finely dispersed in water with the aid of an amphiphilic poly(epsilon-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.
URI
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201802737https://repository.hanyang.ac.kr/handle/20.500.11754/105809
ISSN
1616-301X; 1616-3028
DOI
10.1002/adfm.201802737
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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