Unimolecular micelles composed of inner coil-like blocks and outer rod-like blocks crafted by combination of living polymerization with click chemistry

Pang, Xinchang; Feng, Chaowei; Xu, Hui; Han, Wei; Xin, Xukai; Xia, Haiping; Qiu, Feng; Lin, Zhiqun

doi:10.1039/c3py01657a

Cited by 33 publications

(28 citation statements)

References 76 publications

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“…1,23 Briefly, 21-Br-β-CD macroinitiator was prepared by reacting 21 hydroxyl (-OH) groups on β-CD with 2-bromoisobutyryl bromide. [23][24][25] ATRP of 4VP, tBA and St was then performed by using bromine-terminated 21-Br-β-CD macroinitiator, yielding 21-arm star-like P4VP-bPtBA-b-PS with precisely tailored molecular weight (upper left panel in Scheme 1). Plasmonic/semiconductor Au/TiO 2 core/shell nanoparticles were then crafted with the formation of Au core first, followed by the growth of TiO 2 shell, by employing star-like P4VP-b-PtBA-b-PS triblock copolymer as nanoreactor (i.e., template).…”

Section: Methodsmentioning

confidence: 99%

Unconventional Route to Hairy Plasmonic/Semiconductor Core/Shell Nanoparticles with Precisely Controlled Dimensions and Their Use in Solar Energy Conversion

et al. 2015

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Atom transfer radical polymerization (ATRP) of 4-vinyl pyridine, t-butyl acrylate, and styrene in sequential order from a β-cyclodextrin core yielded an amphiphilic star-like triblock copolymer, poly(4-vinyl pyridine)-block-poly(tbutyl acrylate)-block-polystyrene (P4VP-b-PtBA-b-PS). Subsequently, star-like triblock copolymer composed of inner hydrophilic P4VP blocks, central hydrophobic PtBA blocks and outer hydrophobic PS blocks with well-defined molecular architecture and molecular weight of each block was judiciously exploited as nanoreactor for synthesis of precisely shaped hairy plasmonic/semiconductor Au/TiO 2 core/shell nanoparticles. The resulting Au/TiO 2 nanoparticles were intimately and permanently tethered with outer PS chains that enabled the superior solubility of nanoparticles in nonpolar solvents. The PS chains on the surface of these bifunctional nanoparticles were carbonized by annealing in an inert atmosphere (i.e., yielding carbon-coated Au/TiO 2 nanoparticles). In comparison to widely used TiO 2 network film (i.e., P25)-based device, dye-sensitized solar cells assembled by incorporating a thin layer of carbonized Au/TiO 2 nanoparticles on the top of P25 film as photoanode exhibited largely improved short-circuit current density, J sc (18.4% increase) and power conversion efficiency, PCE (13.6% increase), respectively. Such improvements were attributed to the surface plasmon-enabled light harvesting enhancement of Au core and fast electron transport promoted by the carbon layer coating on Au/TiO 2 nanoparticles, as revealed by external quantum efficiency (EQE), UV-Vis spectroscopy and electrochemical impedance spectroscopy measurements, respectively.

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Section: Methodsmentioning

confidence: 99%

Unconventional Route to Hairy Plasmonic/Semiconductor Core/Shell Nanoparticles with Precisely Controlled Dimensions and Their Use in Solar Energy Conversion

et al. 2015

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“…Also, functional polymers such as conducting polymers (e.g., poly(3hexylthiophene; P3HT) [270] ) and dielectric polymers (e.g., polyvinylidene fluoride (PVDF) [271] ) can be conveniently grafted as the outer shell of the unimolecular micelle template and encapsulate the inorganic nanocrystal inside. However, unlike virus capsids, the dimensions of the BCP templates can be easily modified during the polymerization process.…”

Section: Section Summarymentioning

confidence: 99%

Organic Templates for Inorganic Nanocrystal Growth

You

Liang

et al. 2019

Energy & Environ Materials

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Nanocrystals provide a variety of size and shape-dependent properties with applications in a wide range of areas, gaining much attention in the past few years. However, due to the nature of the kinetic nanocrystal growth, the procedures often require strict experimental conditions and the shape and size of nanocrystals are difficult to control. In such context, organic templates, which are artificially modified or synthesized, can direct inorganic nanocrystal nucleation and growth to achieve desired shape, size and ultimately properties. In this review article, two general categories of organic templates used for making inorganic nanomaterials are discussed: biotemplates (e.g., peptide, lipid, DNA, and capsid) and block copolymer templates (e.g., block copolymer micelles, star-like block copolymer unimicelles). The goal of this review is to bridge these gaps and help foster a greater awareness of the range and applicability of different organic templating techniques within the field of nanotechnology. REVIEW Organic TemplateEnergy Environ. Mater. 2019, 2, 38-54

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“…For example, unimolecular micelles composed of star‐shaped copolymers showed much higher stability than the micelles made of diblock copolymers because the arms of star‐shaped copolymers are covalently linked to the core . Lin and coworkers used very stable unimolecular micelles made of star‐shaped copolymers for the fabrication of monodisperse colloidal nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Morphology and microphase separation of star copolymers

Park

Jang

Kim

2014

J Polym Sci B Polym Phys

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Star copolymers have attracted significant interest due to their different characteristics compared with diblock copolymers, including higher critical micelle concentration, lower viscosity, unique spatial shape, or morphologies. Development of synthetic skills such as anionic polymerization and controlled radical polymerization have made it possible to make diverse architectures of polymers. Depending on the molecular architecture of the copolymer, numerous morphologies are possible, for instance, Archimedean tiling patterns and cylindrical microdomains at symmetric volume fraction for miktoarm star copolymers as well as asymmetric lamellar microdomains for star-shaped copolymers, which have not been reported for linear block copolymers. In this review, we focus on morphologies and microphase separations of miktoarm (A m B n and ABC miktoarm) star copolymers and starshaped [(A-b-B) n ] copolymers with nonlinear architecture.

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Unimolecular micelles composed of inner coil-like blocks and outer rod-like blocks crafted by combination of living polymerization with click chemistry

Abstract: Star-shaped PS-b-P3HT was synthesized via a combination of ATRP, GRIM polymerization, and click reaction. They possessed different properties as compared to their linear analogues

Cited by 33 publications

References 76 publications

Unconventional Route to Hairy Plasmonic/Semiconductor Core/Shell Nanoparticles with Precisely Controlled Dimensions and Their Use in Solar Energy Conversion

Unconventional Route to Hairy Plasmonic/Semiconductor Core/Shell Nanoparticles with Precisely Controlled Dimensions and Their Use in Solar Energy Conversion

Organic Templates for Inorganic Nanocrystal Growth

Morphology and microphase separation of star copolymers

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