Highly Ordered Nanoring Arrays Formed by Templated Si‐Containing Triblock Terpolymer Thin Films

et al. 2018

Self Cite

The synthesis and self-assembly in thin-film configuration of linear ABC triblock terpolymer chains consisting of polystyrene (PS), poly(2-vinylpyridine) (P2VP), and polyisoprene (PI) are described. For that purpose, a hydroxyl-terminated PS-b-P2VP (45 kg mol ) building block and a carboxyl-terminated PI (9 kg mol ) are first separately prepared by anionic polymerization, and then are coupled via a Steglich esterification reaction. This quantitative and metal-free catalyst synthesis route reveals to be very interesting since functionalization and purification steps are straightforward, and well-defined terpolymers are produced. A solvent vapor annealing (SVA) process is used to promote the self-assembly of frustrated PS-b-P2VP-b-PI chains into a thin-film core-shell double gyroid (Q , space group: Ia3¯d) structure. As terraces are formed within PS-b-P2VP-b-PI thin films during the SVA process under a CHCl vapor, different plane orientations of the Q structure ((211), (110), (111), and (100)) are observed at the polymer-air interface depending on the film thickness.

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Core–Shell Double Gyroid Structure Formed by Linear ABC Terpolymer Thin Films

Antoine

et al. 2018

Self Cite

“…[5] As a result of microphase separation between the different blocks, self-assembled block copolymer thin films into well-ordered nanoscale morphologies [6][7][8] such as spheres, cylinders, lamellae, and complex networks are extremely versatile platforms to achieve well-defined metallic nanostructures. While AB-type block copolymer (BCP) systems offer an attractive route to produce ND arrays with a common p6mm symmetry pattern due to packing frustration, linear ABC triblock terpolymers provide increased accessible structural diversity including core/shell versions of spheres or cylinders (p6mm), [9][10][11][12][13] alternating spheres or cylinders with a tetragonal packing (p2mm), [14,15] and three complex networks with patterns having p4mm, p3m1, or p2 symmetries. [16][17][18][19][20][21] To create metallic ND patterns from self-assembled BCP thin films both ex situ and in situ methodologies have been studied in the literature.…”

Section: Doi: 101002/marc201700754mentioning

confidence: 99%

Metallic Nanodot Patterns with Unique Symmetries Templated from ABC Triblock Terpolymer Networks

Álvarez-Fernández

et al. 2018

Self Cite

Nanotemplates derived from the self-assembly of AB-type block copolymers provide an elegant route to achieve well-defined metallic dot arrays, even if the variety of pattern symmetries is restricted due to the limited number of structures offered by microphase separated diblock copolymers. A strategy that relies on the use of complex network structures accessible through the self-assembly of linear ABC-type terpolymers is presented for the formation of metallic nanodots arrays with "outside-the-box" symmetries. Patterned templates formed by the cubic Q and orthorhombic O network structures are used as excellent platforms to build well-ordered gold nanodot arrays with unique p3m1 and p2 symmetries, respectively. A simple yet efficient blending strategy is used to tune the critical dimensions of the p3m1 pattern while laterally ordered gold nanodot arrays are also demonstrated through a directed self-assembly approach. Such highly ordered gold nanodots with tunable particle dimensions and array periods, enabling the control of their plasmonic responses, are attractive probes for biological imaging.

“…To enlarge the panel of objects attainable from microphase‐separated BCP thin films, linear ABC terpolymers were successfully introduced as patterns . For instance, well‐ordered hexagonal nanoring arrays were fabricated by using linear ABC terpolymers . This appealing nanostructure is highly desired in technological applications since it exhibits unique optical, electronic, and magnetic properties .…”

mentioning

confidence: 99%

Nanoscale Archimedean Tilings Formed by 3‐Miktoarm Star Terpolymer Thin Films

Antoine

et al. 2019

Self Cite

3‐Miktoarm star terpolymer architecture (3µ‐ABC), consisting of three dissimilar polymer chains, A, B, and C connected at a junction point, provides a unique opportunity in the design of complex nanoscale patterns such as Archimedean tilings that are not accessible from linear ABC terpolymers. In this work, the synthesis and the self‐assembly of 3‐miktoarm star terpolymers, namely, polystyrene‐arm‐poly(2‐vinylpyridine)‐arm‐polyisoprene (3µ‐SPI) into Archimedean tiling patterns is described. Several 3µ‐SPI terpolymers are produced via a mid‐functional PS‐b‐P2VP, synthesized by sequential anionic polymerization, using a 1,1‐diphenylethylene bearing a tert‐butyldimethylsilyl–protected hydroxyl functionality as a core molecule. PI arms with different sizes are then linked to the deprotected hydroxyl function of the core molecule via a Steglich esterification. Solvent‐annealed 3µ‐SPI thin films exhibit nanoscale prisms arranged into a (4.6.12) Archimedean tiling pattern. Depending on the size of the low etch‐resistant PI arm and the solvent selected to promote the self‐assembly of 3µ‐SPI thin films, the voided columns occupy the square or decagonal sites of the (4.6.12) pattern. The use of this (4.6.12) tiling produced for the first time from self‐assembled 3µ‐ABC thin films can be a promising route to build 2D photonic crystals having complete photonic band gaps, where the light propagation is completely prohibited.