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Synthesis of gold nanofluids using a Solution Plasma
YongKang Heo,SangYul Lee,JongHo Oh 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.5
In this study, gold nanofluids were synthesized with various experimental using Solution Plasma Processing (SPP). The size distribution and the shape of gold nanoparticles in the nanofluids were investigated using transmission electron microscopy (TEM). The dispersion stability of gold nanofluids was characterized using zeta-potential, as well. The results demonstrated that the various experimental have a strong effect on the formation of gold nanoparticles in nanofluids. Possible mechanisms for the formation of nanoparticles in SPP are suggested. The electrons provided from the solution plasma are believed to play a vital role in producing the Au nanoparticles. Also, increased electrical energy from the plasma is responsible not only for increasing the surface areas of the nanoparticles in the solution by making the nanoparticles even smaller in size, but also for facilitating good dispersion stability by charging up the nanoparticles negatively. Preliminary resultsshowed that uniform and very fine nanoparticles in solution could be synthesized successfully using SPP.
YongKang Heo,SangYul Lee 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
The gold nanoparticles were synthesized with various discharge duration using solution plasma processing (SPP). The effects of the discharge duration between 0 sec. and 900 sec. Analysis of solution plasma were using optical emmision spectrocopy(OES), oscilloscope. on the size and shape of the gold nanoparticles in SPP were investigated using UV-vis nir spectrophotometer and transmission electron microscopy (TEM). Results showed that discharge duration had a strong effect on the formation of the gold nanoparticles. In the UV-vis nir spectrocopy, an absorbance peak at the wavelength approximately 520㎚ was observed, which indicates the formation of gold nanoparticles. As the discharge duration became longer, the average particle size and the size distribution became smaller. Especially for discharge durationof approximately 900 second, the average size of the gold nanoparticles were measured to be the smallest, an average of 23.2±9.0 ㎚ in diameter and most uniform in size. The particle shape became more spherical with an increase in duration time.