Sinteza praha nanočestica srebra

Abstract

Nanočestice plemenitih metala (NPs) od velikog su interesa zbog svojih izvanrednih optičkih, hemijskih i fizičkih svojstava1. Nanočestice srebra (Ag NPs) privukle su posebnu pažnju zbog njihove primene u različitim oblastima. Ag NPs čestice najčešće se dobijaju redukcijom jona Ag+ u vodenim rastvorima. Međutim, koloidne disprezije su stabilne samo pri niskim koncentracijama metala i teško je dobiti prah NPs iz njihovih disperzija. U literaturi je objavljena sinteza praha Ag NPs primenom skroba metodom iz čvrstog stanja2. U ovom radu je predstavljena sinteza praha Ag NPs redukcijom jona Ag+ jonima citrata, hemijskom reakcijom komponenata u čvrstom stanju, odnosno mehaničko-hemijskim postupkom. Sintetisani prah Ag NPs analiziran je fizičko-hemijskim metodama, SEM, UV-Vis i FTIR spektroskopijom, kao i merenjem zeta potencijala. Dobijene NPs čestice su sfernog oblika, prosečnog prečnika 20 nm i negativnog površinskog naelektrisanja.

Noble metal nanoparticles (NPs) have attracted attention due to their remarkable optical, chemical and physical properties1. Silver NPs (Ag NPs) are of particular interest because of their wide applications, in different areas. The most often Ag NPs were obtained by chemical reduction of Ag+ ions in aqueous solutions. However, colloidal dispersions are stable only in low metal concentration, and it is very difficult to obtain solid NPs from dispersion. Recently, the solid-state method was reported for Ag NPs synthesis2 using starch. Here we presented a citrate-capped Ag NPs successfully prepared by solid-state chemical reaction. The Ag NPs were synthesized by the mechanochemical process. Powdered materials were charac-terized by SEM, UV-Vis and FTIR spectroscopy and, zeta potential measurements. The obtained NPs were spherical, with an average diameter of 20 nm and negative surface charge.