Continuous synthesis of metal nanoparticles in supercritical methanol

Title
Continuous synthesis of metal nanoparticles in supercritical methanol
Authors
최혜민Bambang Veriansyah김재훈김재덕강정원
Keywords
Nanomaterials; supercritical fluids; metal nanoparticles; Supercritical methanol; 2N31920; 2N32210
Issue Date
2010-03
Publisher
The Journal of supercritical fluids
Citation
VOL 52, NO 3, 285-291
Abstract
Metal nanoparticles were synthesized continuously in supercritical methanol (scMeOH) without using reducing agents at a pressure of 30MPa 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.
URI
http://pubs.kist.re.kr/handle/201004/37203
ISSN
0896-8446
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE