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Coaxial Conjugated Polymer/Quantum Rod Assembly into Hybrid Nanowires with Preferred Quantum Rod Orientation
journal contribution
posted on 2021-09-27, 16:04 authored by Jun Ho Hwang, Seon-Mi Jin, Jinwoo Nam, Eunji LeeNanoheterojunction
wires composed of coaxially aligned organic
conjugated polymers (CPs) and inorganic quantum nanoparticles can
provide the continuous charge transport pathway in a confined nanoscale
domain. However, controlling the location and orientation of the 1D
quantum rod (QR) array along the longitudinal axis of the CP nanowire
(NW) is challenging due to the complex and competitive assembly of
two components. The strong dipole–dipole interaction between
QRs with anisotropic nature favors the misalignment of QRs. Herein,
the coupling modes (end-to-end or side-by-side) of CdSe QRs confined
within NWs formed by the crystallization-driven assembly of CPs were
precisely controlled by changing the solution processing. Gradual
diffusion of a poor solvent at the top layer into a good solvent containing
CPs and QRs at the bottom layer provides the preferred end-to-end
QR orientation within micrometer-long hybrid NWs. On the other hand,
simple and fast mixing of good and poor solvents predominantly enforces
side-by-side QR arrays within short hybrid NWs. The competition between
CP crystallization and QR dipole–dipole interaction affects
the QR orientation within coaxial hybrid NWs. This research provides
a deep understanding of mutual self-assembly between CPs and QRs and
a fabrication strategy for p-n heterojunction hybrid NWs with customized
performance in the solution-processable optoelectronic devices.
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processable optoelectronic devicesinorganic quantum nanoparticlesconfined nanoscale domaincoaxial conjugated polymeranisotropic nature favors1d quantum rodlong hybrid nwsquantum rod assemblybottom layer providestop layerresearch provideshybrid nanowirestwo componentsprecisely controlledpoor solventmutual selflongitudinal axisgradual diffusionfast mixingfabrication strategydriven assemblydeep understandingcustomized performancecp nanowirecoupling modescompetitive assemblychallenging duearray along