2024-03-29T02:38:57Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00012395
2022-12-14T04:01:38Z
1221:1222
Surfactant- and reducer-free synthesis of gold nanoparticles in aqueous solutions
Sakai, Toshio
Enomoto, Hiroto
Torigoe, Kanjiro
Sakai, Hideki
Abe, Masahiko
Gold nanoparticle
Surfactant- and reducer-free synthesis
High-frequency ultrasound
Sonochemical reduction
Size- and shape-control
We report here the surfactant- and reducer-free synthesis of gold nanoparticles from an aqueous hydrogen tetrachloroaurate (III) tetrahydrate (HAuCl(4)center dot 4H(2)O) solution using a high-frequency (950 kHz) ultrasound (in the absence of any stabilizing, capping and reducing agents). In particular, size, shape and stability of gold nanoparticles prepared by the 950 kHz ultrasound irradiation (sonication) for 8 min in the surfactant-free aqueous solutions were examined in terms of AuCl(4)(-) concentration (in the range of 0.01-0.1 mM), additional salts (NaCl, HCl and NaOH) and temperature (in the range of 4-60 degrees C). We found that higher AuCl(4)(-) concentration promoted particle growth (size increase) and plate formation. In addition, the plate formation was enhanced with the addition of NaCl or HCl (but not NaOH). This is most likely due to the AuCl(4)(-) reduction on a certain crystal facets (e.g. (1 1 0) facets) caused by the adsorption of Cl(-) ions on specific crystal facets (e.g. (1 1 1) facets). Furthermore, we revealed that the temperature elevated above 50 degrees C led to the formation of spherical gold nanoparticles with the diameter of 20-60 nm from a 0.1 mM AuCl(4)(-) aqueous solution while triangular plates formed coexisting with spherical nanoparticles below 50 degrees C.
Article
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS. 347(1-3):18-26 (2009)
ELSEVIER SCIENCE BV
2009-09-05
eng
journal article
AM
http://hdl.handle.net/10091/16073
https://soar-ir.repo.nii.ac.jp/records/12395
https://doi.org/10.1016/j.colsurfa.2008.10.037
10.1016/j.colsurfa.2008.10.037
0927-7757
AA10892561
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
347
1-3
18
26
https://soar-ir.repo.nii.ac.jp/record/12395/files/Surfactant_reducer-free_synthesis_gold_nanoparticles.pdf
application/pdf
1.3 MB
2015-09-28