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

55 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

Keywords

  • Metal nanoparticles
  • Nanomaterials
  • Supercritical methanol

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Continuous synthesis of metal nanoparticles in supercritical methanol'. Together they form a unique fingerprint.

  • Cite this