Size-controlled gold nanoparticles inside polyacrylamide microgels

作者：Diaz M; Barrera A; Lopez Cuenca S; Martinez Salazar S Y; Rabelero M; Ceja I; Fernandez V V A; Aguilar J^*

来源：Journal of Applied Polymer Science, 2016, 133(25): 43560.

DOI：10.1002/app.43560

• crosslinking
• microgels
• morphology
• nanoparticles
• nanowires
• nanocrystals
• swelling

Gold nanoparticles (AuNPs) of different sizes were synthesized into a crosslinked network of polyacrylamide (PAAm) microgels. PAAm was prepared by means of semicontinuous inverse heterophase polymerization under monomer-starving conditions with a z-average particle size of 384 +/- 18nm. AuNPs with controlled size were obtained by a reduction reaction of Au+3 to Au-0 from a gold(III) chloride trihydrate (HAuCl4) solution inside microgel the crosslinked network (AuNP-PAAm). The reduction reaction was verified for 2h by ultraviolet-visible spectroscopy (UV-vis). AuNP-PAAm exhibited a particle size between 288 +/- 12 and 230 +/- 15nm at HAuCl4 concentrations of 0.4 and 1.3mM, respectively. The AuNP-PAAms were observed by transmission electron microscopy, and their sizes were determined to be 19 +/- 2nm (1.3mM) and 17 +/- 2nm (1.1mM). With UV-vis spectroscopy, we detected the formation of AuNPs at a wavelength of 552nm, and with X-ray diffraction analysis, we proved that the crystal arrangement was face-centered cubic.

• 出版日期2016-7-5