POS5-1152
Enhanced Thermal Stability of Self-Assembled Block Copolymer Distributed Bragg Reflectors through Metal-Ion Doping
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
SHANGXIAN DING (Yonsei University)
Co-Author(s)
Abstract
We present a feasible strategy for improving the thermal stability of Distributed Bragg Reflectors (DBRs) using lamella-forming polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) self-assembly. The BCP films imposed on a symmetric confinement produced defect-free multilayer nanostructures oriented parallel to the substrates. The P2VP domains were subsequently crosslinked using 1,4-dibromobutane (DBB), followed by transition-metal ion doping from hydrochloric acid aqueous solutions including Pd2+, Pt2+, Cu2+, Co2+, and Ni2+. A weak hydroxy acid of lactic acid (LA) in methanol solution was further incorporated into the P2VP domains, leading to the selective swelling of the metal-containing P2VP layers and the formation of highly reflective photonic structures with tunable reflected wavelengths across the visible region.
The doped metal ions significantly influenced the optical properties and thermal durability of the DBRs, indicating that metal-polymer interactions play an important role in determining their performance. Among the investigated metal ions, Pd-doped DBRs exhibited superior reflectance retention during thermal aging at elevated temperatures. While pristine DBRs rapidly lost optical intensity upon heating, Pd-doped DBRs maintained their photonic characteristics for extended periods under identical conditions. The enhanced thermal stability suggests stronger interactions between the metal species and protonated pyridine groups, thereby restricting chain mobility and suppressing structural relaxation.
The results highlighted in this study demonstrate that metal-ion doping provides an effective strategy for improving the thermal stability of block copolymer photonic structures while preserving wavelength tunability. This approach offers new insights into the relationship between polymer-ion interactions and photonic performance, providing a versatile platform for the development of robust polymer-based optical materials.
The doped metal ions significantly influenced the optical properties and thermal durability of the DBRs, indicating that metal-polymer interactions play an important role in determining their performance. Among the investigated metal ions, Pd-doped DBRs exhibited superior reflectance retention during thermal aging at elevated temperatures. While pristine DBRs rapidly lost optical intensity upon heating, Pd-doped DBRs maintained their photonic characteristics for extended periods under identical conditions. The enhanced thermal stability suggests stronger interactions between the metal species and protonated pyridine groups, thereby restricting chain mobility and suppressing structural relaxation.
The results highlighted in this study demonstrate that metal-ion doping provides an effective strategy for improving the thermal stability of block copolymer photonic structures while preserving wavelength tunability. This approach offers new insights into the relationship between polymer-ion interactions and photonic performance, providing a versatile platform for the development of robust polymer-based optical materials.
