Programmed Self-Assembly of Branched Nanocrystals with an Amphiphilic Surface Pattern

Yuki Taniguchi, Muhammad Adli Bin Sazali, Yusei Kobayashi, Noriyoshi Arai, Tsuyoshi Kawai, Takuya Nakashima

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Site-selective surface modification on the shape-controlled nanocrystals is a key approach in the programmed self-assembly of inorganic colloidal materials. This study demonstrates a simple methodology to gain self-assemblies of semiconductor nanocrystals with branched shapes through tip-to-tip attachment. Short-chained water-soluble cationic thiols are employed as a surface ligand for CdSe tetrapods and CdSe/CdS core/shell octapods. Because of the less affinity of arm-tip to the surface ligands compared to the arm-side wall, the tip-surface becomes uncapped to give a hydrophobic nature, affording an amphiphilic surface pattern. The amphiphilic tetrapods aggregated into porous agglomerates through tip-to-tip connection in water, while they afforded a hexagonally arranged Kagome-like two-dimensional (2D) assembly by the simple casting of aqueous dispersion with the aid of a convective self-assembly mechanism. A 2D net-like assembly was similarly obtained from amphiphilic octapods. A dissipative particle dynamics simulation using a planar tripod model with an amphiphilic surface pattern reproduced the formation of the Kagome-like assembly in a 2D confined space, demonstrating that the lateral diffusion of nanoparticles and the firm contacts between the hydrophobic tips play crucial roles in the self-assembly.

Original languageEnglish
Pages (from-to)9312-9320
Number of pages9
JournalACS Nano
Volume11
Issue number9
DOIs
Publication statusPublished - 2017 Sep 26
Externally publishedYes

Fingerprint

Nanocrystals
Self assembly
self assembly
nanocrystals
assembly
Ligands
Water
Sulfhydryl Compounds
tripods
selective surfaces
Surface treatment
ligands
Casting
thiols
Semiconductor materials
Nanoparticles
water
attachment
affinity
Computer simulation

Keywords

  • branched structures
  • dissipative particle dynamics
  • hydrophobic effect
  • nanocrystals
  • self-assembly

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Taniguchi, Y., Sazali, M. A. B., Kobayashi, Y., Arai, N., Kawai, T., & Nakashima, T. (2017). Programmed Self-Assembly of Branched Nanocrystals with an Amphiphilic Surface Pattern. ACS Nano, 11(9), 9312-9320. https://doi.org/10.1021/acsnano.7b04719

Programmed Self-Assembly of Branched Nanocrystals with an Amphiphilic Surface Pattern. / Taniguchi, Yuki; Sazali, Muhammad Adli Bin; Kobayashi, Yusei; Arai, Noriyoshi; Kawai, Tsuyoshi; Nakashima, Takuya.

In: ACS Nano, Vol. 11, No. 9, 26.09.2017, p. 9312-9320.

Research output: Contribution to journalArticle

Taniguchi, Y, Sazali, MAB, Kobayashi, Y, Arai, N, Kawai, T & Nakashima, T 2017, 'Programmed Self-Assembly of Branched Nanocrystals with an Amphiphilic Surface Pattern', ACS Nano, vol. 11, no. 9, pp. 9312-9320. https://doi.org/10.1021/acsnano.7b04719
Taniguchi, Yuki ; Sazali, Muhammad Adli Bin ; Kobayashi, Yusei ; Arai, Noriyoshi ; Kawai, Tsuyoshi ; Nakashima, Takuya. / Programmed Self-Assembly of Branched Nanocrystals with an Amphiphilic Surface Pattern. In: ACS Nano. 2017 ; Vol. 11, No. 9. pp. 9312-9320.
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