Colorimetric detection of Cr(<scp>vi</scp>) using silver nanoparticles functionalized with PVP

Abstract

In pH 5.5 PBS buffer, PVP selectively coordinated with Cr(<sc>vi</sc>), causing PVP-AgNPs aggregation, the solution color changed from bright yellow to orange, and the characteristic absorption peak of PVP–AgNPs at 390 nm lowered, a new peak at 530 nm appeared.