Directly observed Au-S bond breakage due to swelling of the anchored polyelectrolyte.
A weak polyelectrolyte coating, carboxylated poly(oligo(ethylene glycol)methacrylate-co-2-hydroxyethylmethacrylate), was prepared via surface initiated polymerization (SIP) from initiators immobilized to gold surface through the Au-S bonds. When dry thickness increased up to 75 nm, this polyelectrolyte coating was pulled off the Au substrate by simply exposing to phosphate buffer saline (PBS, pH = 7.4, [Na(+)] = 150 mM). This covalent bond breaking (CBB) behavior was monitored in situ using a quartz crystal microbalance (QCM) and CBB was associated with the swelling of the anchored polyelectrolyte chains.
Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Science, Suzhou, 21513, P. R. China.
Yanxia
Y
Zhang
Jian'an
J
He
Ying
Y
Zhu
Hong
H
Chen
Hongwei
H
Ma
D004573:Electrolytes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D008689:Methacrylates / Q000737:chemistry; D018625:Microscopy, Atomic Force; D011073:Polyamines; D011092:Polyethylene Glycols / Q000737:chemistry; D011102:Polyhydroxyethyl Methacrylate / Q000031:analogs & derivatives; D011109:Polymethacrylic Acids; D058525:Quartz Crystal Microbalance Techniques / Q000379:methods*; D013455:Sulfur / Q000737:chemistry*
D004573:Electrolytes; D008689:Methacrylates; D011073:Polyamines; D011109:Polymethacrylic Acids; C056971:poly(2-hydroxyethyl methacrylate)-polyamine graft copolymer; C528061:poly(poly(ethylene glycol)methacrylate); D011102:Polyhydroxyethyl Methacrylate; D011092:Polyethylene Glycols; D013455:Sulfur; D006046:Gold