Effect of citrate concentration on colloidal gold (Au) nanoparticles produced using electro-dissolution-reduction method

Haiza, Haroon and Yaacob, Iskandar Idris and Ahmad Azhar, Ahmad Zahirani (2016) Effect of citrate concentration on colloidal gold (Au) nanoparticles produced using electro-dissolution-reduction method. In: Seminar on Advanced Materials haracterization Techniques in Research, Industry and Nuclear Applications, AMCT 2015, Selangor.

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Abstract

Colloidal gold nanoparticles have been successfully synthesized using electrodissolution-reduction process that consists of a simple two-electrode cells connected to a DC power supply. Throughout the process, bulk gold at the anode was 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 citrate concentration. 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 citrate concentration, the size of colloidal gold nanoparticles produced marginally increased. The mean sizes of gold nanoparticles were roughly about 18.7 nm, 19.3 nm, 20.5 nm and 21.3 nm for citrate concentrations of 0.05 M, 0.10 M, 0.15 M and 0.20 M, respectively. However, sample prepared without the addition of citrate, remained colorless indicating that aurochloride complex ions were not reduced to colloidal gold nanoparticles. TEM micrographs 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.

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	6524/48162
Uncontrolled Keywords:	Gold, Nanoparticles, Electro-dissolution-reduction
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA401 Materials of engineering and construction
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr Ahmad Zahirani Ahmad Azhar
Date Deposited:	23 Feb 2016 15:19
Last Modified:	21 Apr 2017 11:45
URI:	http://irep.iium.edu.my/id/eprint/48162

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