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

Journal Article · · ACS Macro Letters
 [1];  [2];  [2];  [2]
  1. Northwestern Univ., Evanston, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Light Energy-Activated Redox Processes (LEAP); CBES
  2. 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.

Research Organization:
Northwestern Univ., Evanston, IL (United States). Center for Bio-Inspired Energy Science (CBES); Energy Frontier Research Centers (EFRC) (United States). Center for Light Energy-Activated Redox Processes (LEAP)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); International Institute for Nanotechnology (IIN); Keck Foundation; State of Illinois; American Australian Association Dow Chemical Company Fellowship
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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