Naslov
Microemulsion synthesis of gold nanoparticles

Autori
Jurkin, Tanja ; Guliš, Martina ; Dražić, Goran ; Gotić, Marijan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Program and Abstracts of 13th Tihany Symposium on Radiation Chemistry / - Balatonalmadi, 2015, P18-P18

Skup
13th Tihany Symposium on Radiation Chemistry

Mjesto i datum
Balatonalmádi, Mađarska, 29.08.2015. - 03.09.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
gold nanoparticles; microemulsion; gamma-irradiation; NaBH4; oxidizing conditions; Triton X-100; 1-pentanol

Sažetak
The gold nanoparticles were synthesized in the microemulsion Triton X-100/water/cyclohexane/n-pentanol system using various reducing agents. The syntheses were performed at room temperature by mixing two identical water-in-oil microemulsions. One microemulsion contained the dissolved HAuCl4 as starting gold precursor and the other a desired reducing agents. When the strong chemical reducing agent NaBH4 was used in the microemulsion, the gold nanoparticles of approximately 12 nm in size were obtained as determined on the basis of XRD and SEM measurements. In the next experiments, the Au3+ ions in microemulsions were reduced using γ-irradiation. The reducing power of γ-radiation was tuned by changing the irradiation atmosphere. The γ-irradiation of nitrogen-saturated microemulsion produced gold nanoparticles of ~10 nm in size, which under centrifugation/isolation partly aggregated in huge nanoparticles above 100 nm in size. With the twice of gold concentration in microemulsion the small gold nanoparticles completely aggregated in large ones of about 140 nm in size. γ-irradiation of microemulsion in the presence of dissolved oxygen at pH<7 produced well-dispersed 16 nm gold nanoparticles. On the contrary, at pH>7 very large aggregated nanoparticles were produced. In addition, the reduction of Au3+ by Triton X-100 surfactant molecules without adding any extra reducing agent to microemulsion was investigated. The microemulsion stirred at room temperature at pH<7 containing no added reducing agent did not produce gold nanoparticles, whereas at the identical conditions at pH>7 the well-dispersed 12 nm gold nanoparticles were formed. The results of UV-Vis spectroscopy showed the progressive formation of gold nanoparticles in the alkaline microemulsions that contained no reducing agent. This work showed the high influence of different reducing agents on the microemulsion synthesis of gold nanoparticles.

Izvorni jezik
Engleski

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