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Assembly of P3HT/CdSe nanowire networks in an insulating polymer host
Heo, Kyuyoung,Miesch, Caroline,Na, Jun-Hee,Emrick, Todd,Hayward, Ryan C. The Royal Society of Chemistry 2018 Soft matter Vol.14 No.25
<P>Nanoparticles may act as compatibilizing agents for blending of immiscible polymers, leading to changes in blend morphology through a variety of mechanisms including interfacial adsorption, aggregation, and nucleation of polymer crystals. Herein, we report an approach to define highly structured donor/acceptor networks based on poly(3-hexylthiophene) (P3HT) and CdSe quantum dots (QDs) by demixing from an insulating polystyrene (PS) matrix. The incorporation of QDs led to laterally phase-separated co-continuous structures with sub-micrometer dimensions, and promoted crystallization of P3HT, yielding highly interconnected P3HT/QD hybrid nanowires embedded in the polymer matrix. These nanohybrid materials formed by controlling phase separation, interfacial activity, and crystallization within ternary donor/acceptor/insulator blends, offer attractive morphologies for potential use in optoelectronics.</P>
Yoon, Jinhwan,Heo, Kyuyoung,Oh, Weontae,Jin, Kyeong Sik,Jin, Sangwoo,Kim, Jehan,Kim, Kwang-Woo,Chang, Taihyun,Ree, Moonhor IOP Pub 2006 Nanotechnology Vol.17 No.14
<P>The miscibility and the mechanism for thermal nanopore templating in films prepared from spin-coating and subsequent drying of homogenous solutions of curable polymethylsilsesquioxane dielectric precursor and thermally labile, reactive triethoxysilyl-terminated four-armed poly(ϵ-caprolactone) porogen were investigated in detail by <I>in situ</I> two-dimensional grazing incidence small-angle x-ray scattering analysis. The dielectric precursor and porogen components in the film were fully miscible. On heating, limited aggregations of the porogen, however, took place in only a small temperature range of 100–140 ?C as a result of phase separation induced by the competition of the curing and hybridization reactions of the dielectric precursor and porogen; higher porogen loading resulted in relatively large porogen aggregates and a greater size distribution. The developed porogen aggregates underwent thermal firing above 300 ?C without further growth and movement, and ultimately left their individual footprints in the film as spherical nanopores.</P>
Imprinting well-controlled closed-nanopores in spin-on polymeric dielectric thin films
Ree, Moonhor,Yoon, Jinhwan,Heo, Kyuyoung Royal Society of Chemistry 2006 Journal of materials chemistry Vol.16 No.7
<P>The use of low dielectric constant (low-<I>k</I>) interdielectrics in multilevel structure integrated circuits (ICs) can lower line-to-line noise in interconnects and alleviate power dissipation issues by reducing the capacitance between the interconnect conductor lines. Because of these merits, low-<I>k</I> interdielectric materials are currently in high demand in the development of advanced ICs. This article reviews recent developments in the imprinting of closed nanopores into spin-on materials to produce low-<I>k</I> nanoporous interdielectrics for the production of advanced ICs.</P> <P>Graphic Abstract</P><P>Recent developments in the imprinting of closed nanopores into spin-on materials to produce low dielectric constant nanoporous dielectrics for the production of advanced integrated circuits in multilevel structure are reviewed. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b511301f'> </P>
Synchrotron Grazing Incidence X-ray Scattering and its Applications in Polymer Nanotechnology
Moonhor Ree,Byeongdu Lee,Jinhwan Yoon,Kyuyoung Heo,Kyeong Sik Jin,Sangwoo Jin,Hyunchul Kim,Ghahee Kim,Seung Chul Choi,Weontae Oh,Young-Hee Park,Yongtaek Hwang,Jong-Seong Kim,Jehan Kim,Kwang-Woo Kim,Ta 한국고분자학회 2006 한국고분자학회 학술대회 연구논문 초록집 Vol.2006 No.10