Surface enhanced Raman scattering on SiO₂/Ag nanoparticles aggregate and preparation of nitrogen-doped carbon dots by pyrolysis of Co(2,2′-bipyridine)₂(dicyanamide)₂

Abstract

Co(2,2'-bipyridine) 2 (dicyanamide) 2 , Co(bpy) 2 (N(CN) 2 ) 2 , was synthesised by solution crystallisation method. The 'external' lattice modes of Co(bpy) 2 (N(CN) 2 ) 2 crystal have been determined by use of the method of nuclear site group analysis. Based on the surface enhanced Raman scattering (SERS) activity of silver nanoparticles (Ag-NPs), a SiO 2 /Ag-NPs/Co(bpy) 2 (N(CN) 2 ) 2 aggregate was prepared in order to better analyse the adsorption orientation of the cobalt complex on the surface of Ag-NPs. The result of the SERS measurement indicates that the molecular plane presents a tilted orientation with respect to the Ag-NPs surface. The system described here could serve as the basis for a study of accurate and available SERS sensor. The pyrolysis products at 553 and 593 K, respectively, in air have been investigated. The results showed that nitrogen-doped carbon dots were obtained from the pyrolysis products of Co(bpy) 2 (N(CN) 2 ) 2 calcined at 553 K. This process can be exploited as a simple and effective path for the synthesis of nitrogen-doped carbon dots by using nitrogen-containing metal organic complex as precursors.

SERS property of Co complex on boron nitride nanosheets/silver nanoparticles aggregates and photophysical characterisation of interactions among Co complex ion-exchanged within zirconium phosphate

“…¡ , is not involved in the construction of the final complex. Actually, the first croci cube grains were determined as Co(bpy) 2 [N(CN) 2 ] 2 by single crystal X-ray diffraction analysis [23]. The orange [Co(bpy) 2 As the TEM image shown in Figure 2, the BN nanosheet surfaces were decorated with near-spherical Ag-NPs with diameters in the range of about 20-150 nm.…”