TY  - JOUR
A1  - Wu, Lei
A1  - Glebe, Ulrich
A1  - Böker, Alexander
T1  - Fabrication of Thermoresponsive Plasmonic Core-Satellite Nanoassemblies with a Tunable Stoichiometry via Surface-Initiated Reversible Addition-Fragmentation Chain Transfer Polymerization from Silica Nanoparticles
JF  - Advanced materials interfaces
N2  - This work presents a fabrication of thermoresponsive plasmonic core-satellite nanoassemblies. The structure has a silica nanoparticle core surrounded by gold nanoparticle satellites using thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) chains as scaffolds. The thiol-terminated PNIPAM shell is densely grafted on the silica core via surface-initiated reversible addition-fragmentation chain transfer polymerization and used to anchor numerous gold nanoparticle satellites with a tunable stoichiometry. Below and above lower critical solution temperature, the chain conformation of PNIPAM reversibly changes between swollen and shrunken state. The reversible change of the polymer size varies the refractive index of the local medium surrounding the satellites and the distance between them. The two effects together lead to the thermoresponsive plasmonic properties of the nanoassemblies. Under different satellite densities, two distinctive plasmonic features appear.
KW  - gold
KW  - hybrid materials
KW  - polymeric materials
KW  - silica
KW  - surface plasmon resonance
Y1  - 2017
U6  - https://doi.org/10.1002/admi.201700092
SN  - 2196-7350
VL  - 4
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Wu, Lei
A1  - Glebe, Ulrich
A1  - Böker, Alexander
T1  - Synthesis of Hybrid Silica Nanoparticles Densely Grafted with Thermo and pH Dual-Responsive Brushes via Surface-Initiated ATRP
JF  - Macromolecules : a publication of the American Chemical Society
Y1  - 2016
U6  - https://doi.org/10.1021/acs.macromol.6b01792
SN  - 0024-9297
SN  - 1520-5835
VL  - 49
SP  - 9586
EP  - 9596
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Wu, Lei
A1  - Glebe, Ulrich
A1  - Böker, Alexander
T1  - Surface-initiated controlled radical polymerizations from silica nanoparticles, gold nanocrystals, and bionanoparticles
JF  - Polymer Chemistry
N2  - In recent years, core/shell nanohybrids containing a nanoparticle core and a distinct surrounding shell of polymer brushes have received extensive attention in nanoelectronics, nanophotonics, catalysis, nanopatterning, drug delivery, biosensing, and many others. From the large variety of existing polymerization methods on the one hand and strategies for grafting onto nanoparticle surfaces on the other hand, the combination of grafting-from with controlled radical polymerization (CRP) techniques has turned out to be the best suited for synthesizing these well-defined core/shell nanohybrids and is known as surface-initiated CRP. Most common among these are surface-initiated atom transfer radical polymerization (ATRP), surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization, and surface-initiated nitroxide-mediated polymerization (NMP). This review highlights the state of the art of growing polymers from nanoparticles using surface-initiated CRP techniques. We focus on mechanistic aspects, synthetic procedures, and the formation of complex architectures as well as novel properties. From the vast number of examples of nanoparticle/polymer hybrids formed by surface-initiated CRP techniques, we present nanohybrid formation from the particularly important and most studied silica nanoparticles, gold nanocrystals, and proteins which can be regarded as bionanoparticles.
Y1  - 2015
U6  - https://doi.org/10.1039/c5py00525f
SN  - 1759-9954
SN  - 1759-9962
VL  - 6
IS  - 29
SP  - 5143
EP  - 5184
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  -