Continuous synthesis of metal nanoparticles in supercritical methanol

Hyemin Choi, Bambang Veriansyah, Jaehoon Kim, Jae Duck Kim, Jeong Won Kang

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Metal nanoparticles were synthesized continuously in supercritical methanol (scMeOH) without using reducing agents at a pressure of 30 MPa and at various reaction temperatures ranging 150-400 °C. Wide angle X-ray diffraction (WAXD) analysis revealed that metallic nickel (Ni) nanoparticles were synthesized at a reaction temperature of 400 °C while mixtures of nickel hydroxide (α-Ni(OH)2) and metallic Ni were produced at lower reaction temperatures of 250-350 °C. In contrast, metallic silver (Ag) nanoparticles were produced at reaction temperatures above 150 °C while metallic cupper (Cu) nanoparticles were produced at reaction temperatures above 300 °C. Mixtures of copper oxide (CuO and Cu2O) and metallic Cu were produced at lower reaction temperatures of 250 °C. Scanning electron microscopy (SEM) showed that the particles size and morphology changed drastically as the reaction temperature increased. The average diameters of Ni, Cu and Ag particles synthesized at 400 °C were 119 ± 19 nm, 240 ± 44 nm, and 148 ± 32 nm, respectively. The scMeOH acted both as a reaction medium and a reducing agent. A possible reduction mechanism in scMeOH is also presented.

Original languageEnglish
Pages (from-to)285-291
Number of pages7
JournalJournal of Supercritical Fluids
Volume52
Issue number3
DOIs
Publication statusPublished - 2010 Apr 1

Fingerprint

Metal nanoparticles
Methanol
methyl alcohol
Nickel
nanoparticles
synthesis
metals
nickel
Reducing Agents
Temperature
Reducing agents
Nanoparticles
temperature
Copper oxides
Silver
copper oxides
X ray diffraction analysis
hydroxides
Particle size
silver

Keywords

  • Metal nanoparticles
  • Nanomaterials
  • Supercritical methanol

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)
  • Condensed Matter Physics

Cite this

Continuous synthesis of metal nanoparticles in supercritical methanol. / Choi, Hyemin; Veriansyah, Bambang; Kim, Jaehoon; Kim, Jae Duck; Kang, Jeong Won.

In: Journal of Supercritical Fluids, Vol. 52, No. 3, 01.04.2010, p. 285-291.

Research output: Contribution to journalArticle

Choi, Hyemin ; Veriansyah, Bambang ; Kim, Jaehoon ; Kim, Jae Duck ; Kang, Jeong Won. / Continuous synthesis of metal nanoparticles in supercritical methanol. In: Journal of Supercritical Fluids. 2010 ; Vol. 52, No. 3. pp. 285-291.
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