Silver nanocombs and branched nanowires formation in aqueous binary surfactants solution

Ali Umar Akrajas, Munetaka Oyama, Muhamad Mat Salleh, Burhanuddin Yeop Majlis

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Branched nanocrystals, particularly nanocombs, are a unique 1D-morphology that is normally formed in polytypic materials, such as ZnO, and rarely occurs in the highly symmetric fcc metallic system. Here, we report the chemical synthesis of nanocombs of a highly symmetrical fcc silver system that is realized by reducing the silver ions in the presence of a mixture of silver nanoseeds and binary surfactants, namely cetyltrimethylammonium bromide (CTAB) and hexamethylenetetramine (hexamine or HMT), under an alkaline condition. The silver nanocombs feature a high-degree branching orientation toward a single direction with good branch-to-branch spacing. The nanocombs formation was very sensitive to the concentrations of CTAB, HMT and NaOH in the reaction in which, in a typical case, nanocombs or curly nanowires were produced by controlling the concentration of these chemicals in the reaction. We hypothesized that the branching could be due to: (i) a kind of polytypism in such highly symmetrical fcc nanocrystals that was enabled by a selective surfactant adhesion process on the growing crystalline plane and (ii) lattice defects or twinning induced growth redirection in the nanocrystals. The silver nanocombs might generate a peculiar characteristic that is probably superior to those produced by other morphologies, such as nanorods, nanowires, and so on. Thus, it should find extensive use in the currently existing applications.

Original languageEnglish
Article number1001
JournalJournal of Nanoparticle Research
Volume14
Issue number7
DOIs
Publication statusPublished - 2012

Fingerprint

Surfactant
Nanowires
Silver
Surface-Active Agents
Surface active agents
nanowires
surfactants
silver
Nanocrystals
Binary
Methenamine
nanocrystals
Branching
bromides
Branch
Chemical Synthesis
hexamethylenetetramine
Twinning
Nanorods
Crystal defects

Keywords

  • Branched nanorods
  • Nanocombs
  • Seed-mediated growth
  • Silver nanoparticles

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Modelling and Simulation
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering

Cite this

Silver nanocombs and branched nanowires formation in aqueous binary surfactants solution. / Akrajas, Ali Umar; Oyama, Munetaka; Mat Salleh, Muhamad; Yeop Majlis, Burhanuddin.

In: Journal of Nanoparticle Research, Vol. 14, No. 7, 1001, 2012.

Research output: Contribution to journalArticle

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