Record number :
1422510
Title of article :
Continuous synthesis of metal nanoparticles in supercritical methanol
Author/Authors :
Choi، نويسنده , , Hyemin and Veriansyah، نويسنده , , Bambang and Kim، نويسنده , , Jaehoon and Kim، نويسنده , , Jae-Duck and Kang، نويسنده , , Jeong Won، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
7
From page :
285
To page :
291
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.
Keywords :
Nanomaterials , Supercritical methanol , Metal nanoparticles
Journal title :
Journal of Supercritical Fluids
Journal title :
Journal of Supercritical Fluids
Serial Year :
2010
Link To Document :
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