Effect of voltage on colloidal gold (Au) nanoparticles produced using electro-dissolution-reduction method
Colloidal gold nanoparticles have been successfully prepared using a simple two-electrode cells connected to a DC power supply. During the electro-dissolution-reduction process, the bulk gold at the anode oxidized into gold cations which then reacted with the chloride ions to form aurochloride co...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Trans Tech Publications, Switzerland
2015
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/45856/1/2015_-_AMR%2C_ICAMME_2014%2C_Haiza.pdf http://irep.iium.edu.my/45856/ http://www.scientific.net/AMR.1115.386 |
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| Summary: | Colloidal gold nanoparticles have been successfully prepared using a simple two-electrode cells
connected to a DC power supply. During the electro-dissolution-reduction process, the bulk gold at
the anode oxidized into gold cations which then reacted with the chloride ions to form aurochloride
complex. The complex ions were then reduced by the citrate ion to form colloidal gold
nanoparticles. The size and shape of the nanoparticles were modulated by varying the terminal
voltages. The colloidal gold nanoparticles obtained were characterized by field-emission scanning
electron microscope (FESEM), transmission electron microscope (TEM) and ultraviolet-visible
spectrophotometer (UV-Vis). From FESEM analysis, it was found that by increasing the voltage,
the size of colloidal gold nanoparticles produced marginally decreased. The mean sizes of gold
nanoparticles were roughly about 23.5 nm, 23.2 nm and 19.3 nm for 32 V, 36 V and 40 V,
respectively. TEM micrograph showed that the shape of gold nanoparticles obtained is almost
spherical. The characteristic peaks of UV-Vis spectra revealed that the suspension was indeed
colloidal gold nanoparticles. |
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