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 language | English |
|---|---|
| Pages (from-to) | 285-291 |
| Number of pages | 7 |
| Journal | Journal of Supercritical Fluids |
| Volume | 52 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2010 Apr 1 |
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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 journal › Article
}
TY - JOUR
T1 - Continuous synthesis of metal nanoparticles in supercritical methanol
AU - Choi, Hyemin
AU - Veriansyah, Bambang
AU - Kim, Jaehoon
AU - Kim, Jae Duck
AU - Kang, Jeong Won
PY - 2010/4/1
Y1 - 2010/4/1
N2 - 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.
AB - 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.
KW - Metal nanoparticles
KW - Nanomaterials
KW - Supercritical methanol
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UR - http://www.scopus.com/inward/citedby.url?scp=77949304080&partnerID=8YFLogxK
U2 - 10.1016/j.supflu.2010.01.015
DO - 10.1016/j.supflu.2010.01.015
M3 - Article
VL - 52
SP - 285
EP - 291
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
SN - 0896-8446
IS - 3
ER -