Electrical properties of block copolymers containing silver nanoclusters within oriented lamellar microdomains

Abstract

Films containing silver nanoclusters within a lamellar morphology were obtained via postprocessing reduction of the silver-containing regions of block copolymers synthesized by ring opening metathesis polymerization. Solution-cast films (0.1 mm thickness) of the block copolymer exhibited an oriented lamellar morphology with lamellar normals perpendicular to the film plane. The slightly anisotropic dielectric properties, perpendicular and parallel to the film plane, were investigated by direct measurement and by model calculations. The conductivity was highly anisotropic, differing by at least four orders of magnitude in directions parallel and perpendicular to the film plane.

Hierarchical synthesis of silver nanoparticles and wires by copolymer templates and visible light

“…The synthesis of AgNPs generally involves the use of reducing agents [31][32][33][34][35][36] and organic stabilizers [19][20][21][22][23][24][25][26][27][28][29]. In this study, AgNO 3 was reduced in the presence of POE-functionalized SMA copolymers under exposure to visible light.…”

“…In general, the synthesis involves the reduction of silver ions (Ag + ) in the presence of organic stabilizers [16] and reducing agents [17]. Furthermore, silver nanostructures of various shapes [18], including spherical, triangular and fibrous morphologies have been reported by using polymer templates, including block copolymers [19][20][21], DNA [22,23], poly(acrylic acid) (PAA) [24], poly(vinyl pyrrolidone) (PVP) [25][26][27], poly(vinyl alcohol) (PVA) [28] and poly(styrene-alt-maleic anhydride) (SMA) [29]. Organic surfactants such as cetyltrimethylammonium bromide (CTAB) [30] may be present to form rod-shaped micelles which consequently direct the formation of the silver morphology.…”

Cobalt Nanoparticle Formation in the Pores of Hyper-Cross-Linked Polystyrene: Control of Nanoparticle Growth and Morphology

“…Excellent examples of well-defined nanoscale polymer matrixes are micelles formed by block copolymer molecules in selective solvent(s). In this case, the micelles serve as “nanoreactors” for highly controlled nanoparticle preparation. − Recent efforts − have likewise used the microdomains of microphase-separated block copolymers to control nanoparticle growth without the use of solvent(s).…”

Endogenous secretory receptor for advanced glycation endproducts as a novel prognostic marker in chondrosarcoma

“…Thus, the properties of amphiphilic block copolymer/metal hybrids can be controlled through the control of the structure of the block polymer. Advantageous use of such structures has been made for the production of a variety of nonmagnetic metal nanoclusters (Ag, Au, Pd, and Pt)8–12 and magnetic nanoclusters 13, 14…”