Composite quantum dot, method for preparing the same, and method for detecting metal ion using the same

Abstract

A composite quantum dot includes a quantum dot and a protecting unit. The quantum dot includes a dot body containing a first layer having a composition of M1A1, and a passivating unit containing a passivating metal ion and bound to the dot body. M1 is one of Zn, Sn, Pb, Cd, In, Ga, Ge, Mn, Co, Fe, Al, Mg, Ca, Sr, Ba, Ni, Ag, Ti and Cu, and A1 is one of Se, S, Te, P, As, N, I and O. The protecting unit adsorbs on the quantum dot and includes an amine compound and/or a primary ammonium salt thereof. A method for preparing the composite quantum dot and a method for detecting metal ions in an analyte aqueous solution using the composite quantum dot, as well as a passivated quantum dot and a preparation thereof, are also disclosed.

Dependencies are inferred from the claim text.