Kinetics and Mechanism of the Growth of Gold Nanoparticles by Reduction of Tetrachloroauric Acid by Hydrazine in Triton N-42 Reverse Micelles
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Journal of Nanoparticle Research
ISSN: 1388-0764
, E-ISSN: 1572-896X
|
| Вых. Данные |
Год: 2011,
Том: 13,
Страницы: 4997-5007
Страниц
: 11
DOI:
10.1007/s11051-011-0481-1
|
| Ключевые слова |
Gold nanoparticles, Growth kinetics, Reverse micelles, Triton N-42 surfactant |
| Авторы |
Tatarchuk Vladimir V.
1
,
Sergievskaya Anastasiya P.
1
,
Druzhinina Irina A.
1
,
Zaikovskii Vladimir I.
2
|
| Организации |
| 1 |
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 3 Ac. Lavrentyev
|
| 2 |
Boreskov Institute of Catalysis Siberian Branch Russian Academy of Sciences, 5 Ac. Lavrentyev pr.
|
|
Информация о финансировании (2)
|
1
|
Российский фонд фундаментальных исследований
|
05-03-32308
|
|
2
|
Российский фонд фундаментальных исследований
|
09-03-00511
|
The kinetics of the growth of gold nanoparticles during the reduction of tetrachloroauric acid by hydrazine in dispersed aqueous solution encapsulated by reverse micelles of Triton N-42 surfactant (with decane as dispersion medium) was studied by means of spectrophotometry. According to DLS data, at a set value of solubilization capacity V s/V o = 0.005 initial micelles have an aqueous core hydrodynamic diameter d c = 3.6±0.2 nm. The final particles obtained after full reduction of AuIII have a metallic core of defect-free single-crystalline gold with a narrow size distribution and average core diameter d Au = 7.7 ± 1.4 nm as shown by TEM. The rate of the particle growth is limited by the rate of gold reduction. The process kinetics corresponds to the model consisting of two stages of reduction AuIII → AuI → Au0. The stages involve the formation and redox decay of the intermediate complexes Au(N2H4)Cl3 and Au(N2H4)Cl, and each stage proceeds via two routes: (1) homogeneous in the dispersed aqueous phase, and (2) heterogeneous on the particle surfaces. Reactions taking route (2) are autocatalytic because they proceed with participation of the surface atoms of particles as the final products of AuIII reduction. The dependencies of observed rate constants on reagent concentrations, temperature, and solubilization capacity of the micellar solution are studied.