Growth Behavior of Au/Cu2-xS Hybrids and Their Plasmon-enhanced Dual-functional Catalytic Activity
We herein investigated the growth behavior and dual-plasmon enhanced dual-functional catalytic activity of Au/Cu2-xS hybrids. The growth of plasmonic Cu2-xS on Au nanocrystals was achieved through an aqueous solution method. By monitoring the morphological transition, the Cu2-xS shells were found to start growing at a random position on the surface of Au nanospheres or nanorods, then continuing expanding or further growing at a new position to form half-shell or anisotropic Au/Cu2-xS hybrids, thereby completely wrapping the Au cores. The variation trend of strong plasmon coupling between Au and Cu2-xS was clarified, which endows Au/Cu2-xS hybrids with intense absorption in UV-VIS-NIR region. Subsequently, the excellent dual-plasmon enhanced dual-functional catalytic activity of half-shell Au(nanospheres)/Cu2-xS hybrids was demonstrated by evaluating the degradation rate of methylene blue at the presence of H2O2 under light irradiation (λ > 420 nm). We found that the heterogeneous Fenton-like reaction (both Au and Cu2-xS are Fenton-like reactants) and photocatalytic process simultaneously occur on the half-shell Au/Cu2-xS hybrids. Meanwhile, these two types of degradation processes can be remarkably accelerated by the strong dual-plasmon coupling of Au and Cu2-xS.