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Adjustable Intermolecular Interactions Allowing 2D Transition Metal Dichalcogenides with Prolonged Scavenging Activity for Reactive Oxygen Species

Title
Adjustable Intermolecular Interactions Allowing 2D Transition Metal Dichalcogenides with Prolonged Scavenging Activity for Reactive Oxygen Species
Author
김진웅
Keywords
antioxidant effects; aqueous exfoliation; radical oxygen species; ROS scavenging; transition metal dichalcogenides
Issue Date
2018-04
Publisher
WILEY-V C H VERLAG GMBH
Citation
SMALL, v. 14, no. 16, Article no. 1800026
Abstract
There is an increasing demand for control over the dimensions and functions of transition metal dichalcogenides (TMDs) in aqueous solution toward biological and medical applications. Herein, an approach for the exfoliation and functionalization of TMDs in water via modulation of the hydrophobic interaction between poly(epsilon-caprolactone)-b-poly(ethylene glycol) (PCL-b-PEG) and the basal planes of TMDs is reported. Decreasing the hydrophobic PCL length of PCL-b-PEG from 5000 g mol(-1) (PCL5000) to 460 g mol(-1) (PCL460) significantly increases the exfoliation efficiency of TMD nanosheets because the polymer-TMD hydrophobic interaction becomes dominant over the polymer-polymer interaction. The TMD nanosheets exfoliated by PCL460-b-PEG(5000) (460-WS2, 460-WSe2, 460-MoS2, and 460-MoSe2) show excellent and prolonged scavenging activity for reactive oxygen species (ROS), but each type of TMD displays a different scavenging tendency against hydroxyl, superoxide, and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radicals. A mechanistic study based on electron paramagnetic resonance spectroscopy and density functional theory simulations suggests that radical-mediated oxidation of TMDs and hydrogen transfer from the oxidized TMDs to radicals are crucial steps for ROS scavenging by TMD nanosheets. As-prepared 460-TMDs are able to effectively scavenge ROS in HaCaT human keratinocytes, and also exhibit excellent biocompatibility.
URI
https://onlinelibrary.wiley.com/doi/abs/10.1002/smll.201800026https://repository.hanyang.ac.kr/handle/20.500.11754/118219
ISSN
1613-6810; 1613-6829
DOI
10.1002/smll.201800026
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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