One-step synthesis of silver nanoparticles by sonication or heating using amphiphilic block copolymer as templates.
Block copolymer-supported Ag Nps (nanoparticles) have either a "cherry"-like or "raspberry"-like morphology [Antonietti, et al., Adv. Mater. 7 (1995) 1000-1005] depending on the amount of silver nitrate loading and the external conditions. Sonication favors silver nitrate and polyethyleneimine diffusion; the nucleation sites are well distributed in the micellar cores, so it is easy to form the cherry-like Ag NP colloids. However, when the amount of silver nitrate is decreased, it is heating that induces the formation of raspberry-like Ag NP colloids. The Ag NP colloids were investigated by transmission electron microscopy to demonstrate the nanosize dimensions and the location of the Ag NPs in the micelles. X-ray diffraction was employed to determine the crystal structure of the Ag NPs. UV-vis spectroscopy was employed for further qualitative characterization of the optical properties of Ag NPs.
Key Laboratory of Applied Surface and Colloid Chemistry (Shaanxi Normal University), Ministry of Education, School of Chemistry and Materials Science, Xi'an 710062, People's Republic of China.
Zhongli
Z
Lei
Liang
L
Zhang
Xiangyu
X
Wei
D003102:Colloids; D006361:Heating; D053768:Metal Nanoparticles / Q000737:chemistry*; D008823:Micelles; D053758:Nanoparticles; D011108:Polymers; D012834:Silver / Q000737:chemistry*; D013010:Sonication
D003102:Colloids; D008823:Micelles; D011108:Polymers; D012834:Silver