Semiconductor Quantum Dots Are Efficient and Recyclable Photocatalysts for Aqueous PET-RAFT Polymerization

McClelland, Kevin P.; Clemons, Tristan D.; Stupp, Samuel I.; Weiss, Emily A.

doi:10.1021/acsmacrolett.9b00891

Title: Semiconductor Quantum Dots Are Efficient and Recyclable Photocatalysts for Aqueous PET-RAFT Polymerization

Journal Article · 10 December 2019 · ACS Macro Letters

DOI: https://doi.org/10.1021/acsmacrolett.9b00891 · OSTI ID:1865291

McClelland, Kevin P. ^[1];

^[2];

^[2]

Northwestern Univ., Evanston, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Light Energy-Activated Redox Processes (LEAP); CBES
Northwestern Univ., Evanston, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Light Energy-Activated Redox Processes (LEAP)

This Letter describes the use of CdSe quantum dots (QDs) as photocatalysts for photoinduced electron transfer reversible addition–fragmentation chain transfer (PET-RAFT) polymerization of a series of aqueous acrylamides and acrylates. In this work, the high colloidal solubility and photostability of these QDs allowed polymerization to occur with high efficiency (>90% conversion in 2.5 h), low dispersity (PDI < 1.1), and ultralow catalyst loading (<0.5 ppm). The use of protein concentrators enabled the removal of the photocatalyst from the polymer and monomer with tolerable metal contamination (8.41 ug/g). These isolated QDs could be recycled for four separate polymerizations without a significant decrease in efficiency. By changing the pore size of the protein concentrators, the QDs and polymer could be separated from the remaining monomer, allowing for the synthesis of block copolymers using a single batch of QDs with minimal purification steps and demonstrating the fidelity of chain ends.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Light Energy-Activated Redox Processes (LEAP); Northwestern Univ., Evanston, IL (United States). Center for Bio-Inspired Energy Science (CBES)

Sponsoring Organization:: American Australian Association Dow Chemical Company Fellowship; International Institute for Nanotechnology (IIN); Keck Foundation; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); State of Illinois; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001059

OSTI ID:: 1865291

Journal Information:: ACS Macro Letters, Journal Name: ACS Macro Letters Journal Issue: 1 Vol. 9; ISSN 2161-1653

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Monomers
Photocatalysts
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Quantum dots

Title: Semiconductor Quantum Dots Are Efficient and Recyclable Photocatalysts for Aqueous PET-RAFT Polymerization

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