Harnessing nonlinear rubber swelling for bulk synthesis of anisotropic hybrid nanoparticles† †Electronic supplementary information (ESI) available: The TEM images of control Au–PDVB hybrid nanoparticles formed without the presence of PVP and Au–PS hybrid nanoparticles. See DOI: 10.1039/c4tc01660b Click here for additional data file.
نویسندگان
چکیده
Asymmetric hybrid nanoparticles are at the forefront of colloidal chemistry as building blocks for novel structures and applications, as well as for exploring fundamental ways of breaking symmetry in physical systems. Current methods of synthesis have significant limitations in terms of control over synthesis, particle size ranges and polydispersity. We report a facile and scalable synthesis based on the anisotropic swelling of rubber to obtain metal-(polymer rubber) hybrid nanoparticles. Initial Au nanoparticle (NP) seeds are grown larger by reducing HAuCl4 with divinyl benzene (DVB), while simultaneous radical polymerization of DVB forms a cross-linked rubber layer of PDVB on the Au NP surface. The propensity of rubber to swell nonlinearly in the presence of DVB monomers amplifies initial asymmetries to break the symmetry of the PDVB shell, causing growth of asymmetric protrusions on one side of the core-shell particles, which are fixed by further polymerization. Plasmonic absorption of Au allows us to follow the Au reduction reaction and also suggests potential applications of some of the asymmetric particles in plasmon-enhanced sensing. The polydispersity, determined statistically from TEM and SEM images, of the resulting particles is low (<10%) and their sizes, shapes and metal-polymer ratios are easily tunable.
منابع مشابه
A simple approach to obtain hybrid Au-loaded polymeric nanoparticles with a tunable metal load† †Electronic supplementary information (ESI) available. See DOI: 10.1039/c5nr06850a Click here for additional data file.
Figure S1.‐ TEM micrographs of Au‐PLGA hybrid nanoparticles produced by the direct encapsulation method in w/o/w emulsion. a) Marked areas show the location of Au‐NPs outward from the PLGA‐NPs; b) Au aggregation as the concentration of Au colloid is increased.
متن کاملJanus gold nanoparticles obtained via spontaneous binary polymer shell segregation† †Electronic supplementary information (ESI) available: Experimental procedures, results of SAXS, UV-vis and DLS for NPs of different core sizes, polymer coatings and in different solvents; details of emulsification using Janus Au NPs; TEM images after silica coating of Janus Au NPs; 3D images of different stained Au NPs. See DOI: 10.1039/c5cc10454h Click here for additional data file.
Janus gold nanoparticles are of high interest because they allow directed self-assembly and display plasmonic properties. We succeeded in coating gold nanoparticles with two different polymers that form a Janus shell. The spontaneous segregation of two immiscible polymers at the surface of the nanoparticles was verified by NOESY NMR and most importantly by electron microscopy analysis in two an...
متن کاملHydrophilic Pt nanoflowers: synthesis, crystallographic analysis and catalytic performance† †Electronic supplementary information (ESI) available: TEM and high resolution HAADF-STEM analysis, FTIR and XRD measurements, and a summary of the catalytic performance for the different nanoparticles. See DOI: 10.1039/c6ce00039h Click here for additional data file.
متن کامل
Symmetry breaking polymerization: one-pot synthesis of plasmonic hybrid Janus nanoparticles.
Asymmetric hybrid nanoparticles have many important applications in catalysis, nanomotion, sensing, and diagnosis, however ways to generate the asymmetric hybrid nanoparticles are quite limited and inefficient. Most current methods rely on interfacial adhesion and modification of already formed particles. In this article we report a one-pot, facile and scalable synthesis of anisotropic Au-polym...
متن کاملSynthesis of open-mouthed, yolk–shell Au@AgPd nanoparticles with access to interior surfaces for enhanced electrocatalysis† †Electronic supplementary information (ESI) available: Detailed experimental procedure, supplementary TEM images and UV-vis spectra of as-prepared samples, possible formation mechanism of core–shell Au@AgPd NPs, half-encased, core–shell Au@AgPd NPs, conventional yolk–shell Au@AgPd NPs and open-mouthed, yolk–shell Au@AgPd NPs, HAADF-STEM image, HAADF-STEM-EDS images and cross-sectional compositional line profiles of the conventional YS Au@AgPd NPs, UV-vis spectra of conventional and open-mouthed YS Au@AgPd NPs obtained in different solvents of varying refractive indexes, electrocatalytic data of as-prepared samples. See DOI: 10.1039/c5sc01088h
State Key Laboratory of Crystal Materials, S China. E-mail: [email protected] Ian Wark Research Institute, University Australia † Electronic supplementary information procedure, supplementary TEM images samples, possible formation mechan half-encased, core–shell Au@AgPd NPs, and open-mouthed, yolk–shell Au@ HAADF-STEM-EDS images and cross-sect conventional YS Au@AgPd NPs, UV open-mouthed YS Au@A...
متن کامل