Highly controlled core/shell structures: tunable conductive polymer shells on gold nanoparticles and nanochains

Xing, Shengtao; Tan, Li; Yang, Miaoxin; Pan, Ming; Lv, Yunbo; Tang, Qinghu; Yang, Yanhui; Chen, Hongyu

doi:10.1039/b900993k

Cited by 120 publications

(90 citation statements)

References 59 publications

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“…The PANI formed on rGO by oxidation of aniline with ammonium persulfate has been confirmed as emeraldine salt phase, evidenced by UV-vis measurement (Fig. S6), which exhibits absorption peaks at 362, 441, and 789 nm consistent with reported characteristic peaks of emeraldine salt phase [30,31].…”

Section: Resultssupporting

confidence: 66%

A self-standing nanocomposite foam of polyaniline@reduced graphene oxide for flexible super-capacitors

Sun

She

et al. 2015

Synthetic Metals

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Section: Resultssupporting

confidence: 66%

A self-standing nanocomposite foam of polyaniline@reduced graphene oxide for flexible super-capacitors

Sun

She

et al. 2015

Synthetic Metals

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“…27), the most likely candidate is charge repulsion. Moreover, the linear AB 2 is reminiscent of the linear aggregates of AuNPs reported earlier 28,29 , where charge and dipole interactions were proposed to be the main factors in the geometric control.…”

Section: Resultsmentioning

confidence: 98%

A systems approach towards the stoichiometry-controlled hetero-assembly of nanoparticles

et al. 2010

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A central theme in nanotechnology is to advance the fundamental understanding of nanoscale component assembly, thereby allowing rational structural design that may lead to materials with novel properties and functions. nanoparticles (nPs) are often regarded as 'artificial atoms', but their 'reactions' are not readily controllable. Here, we demonstrate a complete nanoreaction system whereby colloidal nPs are rationally assembled and purified. Two types of functionalized gold nPs (A and B) are bonded to give specific products AB, AB 2 , AB 3 and AB 4 . The stoichiometry control is realized by fine-tuning the charge repulsion among the B-nPs. The products are protected by a polymer, which allows their isolation in high purity. The integration of hetero-assembly, stoichiometry control, protection scheme and separation method may provide a scalable way to fabricate sophisticated nanostructures.

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“…phosphine, oleic acid, and active thiol groups) 4,5 but this method used a thin cobalt oxide layer, leading to a low magnetization. However, non-reactive materials have been used as protecting shell, such as graphite, 6 carbon/silica 7 or polymers, [8][9][10] and more recently graphene sheets; 11,12 without need introducing a cobalt oxide layer. In the field of magnetic core/shell systems for bio applications, work of R. Grass et al 11,12 was pioneer using a graphene shell as a protective layer for pure metallic cobalt nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Core double–shell cobalt/graphene/polystyrene magnetic nanocomposites synthesized by in situ sonochemical polymerization

et al. 2015

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Core double-shell cobalt/graphene//polystyrene nanocomposites (Co/C//PS) were synthesized by in situ sonochemical polymerization technique. Commercial Co/C nanoparticles are used and successfully lead to gram-scale production of processable nanocomposite. Synthesized Co/C//PS nanocomposites result in homogeneous and dense dispersion of particles with or without additional polymeric matrix. They showed improved thermal properties such as higher initial degradation temperatures and a significant increase of glass transition temperature (i.e. 10 to 12°C) in contrast to neat PS. These results suggest that covalent bonding occurs between PS and graphene shell, and may be promoted by two surface reactions: "grafting from" when monomer is pre-immobilized on graphene and grows to polymer, and "grafting to" when presynthesized polymer is immobilized on graphene. Both mechanisms are compared and explained. HR-TEM observations revealed polymer shells of 4 to 5 nm covering Co/C nanoparticles or at least small aggregates. However, the number of layer of the graphene shell which consists of 6 to 8 regular layers on raw particles decreases to 3, this layer reduction can be explained by a partial amorphization of graphene occurring during the polymerization. Nevertheless, Co particles are still efficiently protected from oxidation as final Co/C//PS nanocomposites are able to sustain high mass-magnetization (i.e. ~ 49 emu/g for 94 % wt Co/C). First indications of satisfying mechanical cohesion are also shown by the formation of two relevant nanocomposites shapes (film and disk). In conclusion, in situ polymerization is a powerful synthesis method to produce processable high-magnetization nanocomposites.

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Highly controlled core/shell structures: tunable conductive polymer shells on gold nanoparticles and nanochains

Cited by 120 publications

References 59 publications

A self-standing nanocomposite foam of polyaniline@reduced graphene oxide for flexible super-capacitors

A self-standing nanocomposite foam of polyaniline@reduced graphene oxide for flexible super-capacitors

A systems approach towards the stoichiometry-controlled hetero-assembly of nanoparticles

Core double–shell cobalt/graphene/polystyrene magnetic nanocomposites synthesized by in situ sonochemical polymerization

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