RESUMO
Suspensions of titanium nitride (TiN) nanoparticles (NPs) were prepared using nanosecond Ce:Nd:YAG pulsed laser ablation (λ = 1064 nm) of a TiN target immersed in various solvents such as Toluene (C6H5CH3), Acetonitrile (CH3CN), and N, N-dimethylformamide (C3H7NO). The synthesized NPs were characterized by applying a range of spectroscopic, structural, and compositional analysis techniques. The obtained TiN NPs in N, N-dimethylformamide (DMF-TiN NPs) solvent showed strong optical absorption in the near-infrared (NIR) range; Whereas, the obtained TiN NPs in toluene (T-TiN NPs) and acetonitrile (AN-TiN NPs) solvents were covered with a carbon matrix layer that quenched their surface plasmon resonance (SPR). The carbon matrix on the NPs was removed by thermal oxidation to obtain carbon-free TiN NPs. All the prepared carbon-free TiN NPs were employed as substrates for the surface-enhanced Raman scattering (SERS) spectroscopy of methylene blue (MB) molecules as a probe molecule adsorbed on the surface. All substrates indicated nearly the same order of enhancement factors (EFs) (~103) for MB.
RESUMO
We report a single-step route to co-deposit Cu nanoparticles with a graphitic carbon nitride (gCN) support using nanosecond Ce:Nd:YAG pulsed laser ablation from a Cu metal target coated using acetonitrile (CH3CN). The resulting Cu/gCN hybrids showed strong optical absorption in the visible to near-IR range and exhibited surface-enhanced Raman or resonance Raman scattering (SERS or SERRS) enhancement for crystal violet (CV), methylene blue (MB), and rhodamine 6G (R6G) used as probe analyte molecules adsorbed on the surface. We have characterized the Cu nanoparticles and the nature of the gCN support materials using a range of spectroscopic, structural, and compositional analysis techniques.
