Reagents Copper Acetate(WSDTY) monohydrate (Cu(OAc)2·H2O), 2,2′-bipyridine (bpy), dimethylformamide (DMF), sodium borohydride, sodium hydroxide, ethanol and ethylene glycol were purchased from commercial suppliers and used without further purification.
Deionized (DI) water (18 MΩ cm) was obtained from a Simplicity UV system.
X-Ray diffraction (XRD) patterns were collected with an Ultima IV powder diffractometer (Rigaku) using CuKα radiation (α = 1.5406 ?) with a 0.02° 2θ step size and a 2 s dwell time. Transmission electron microscopy (TEM) images were acquired on a JEM-2100 micro-scope (JEOL) operated at an accelerating voltage of 200 kV. The samples were prepared by dropping a dilute NP dispersion in 2-propanol on an amorphous carbon-coated copper grid and allowing it to dry at room temperature. Selected-area electron diffraction (SAED) patterns were also recorded. The optical properties were measured in the diffuse reflectance (DRUV––Vis) mode on a UV-2600 UV–Vis spectrophotometer (Shimadzu). Samples were mixed with BaSO4 powder and pressed in the sample holder for an integrating sphere attachment. The Fourier transform infrared (FTIR) spectra were recorded in the transmittance mode using an FSM-1202 FTIR Spectrometer (InfraSpec) under air in KBr pellets.
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