Facile synthesis of Cu₂S nanoarchitectures in application of surface enhanced Raman scattering

Abstract

Surface plasmon resonance (SPR) is one of the main mechanisms of Surface Raman Enhance Scattering (SERS) and it will depend on the morphology and free carrier density of substrates, in many of discussions have been proved. Recently, the semiconductor copper(I) sulphide (Cu2S), the natural p-type semiconductor, exhibits remarkable SPR in the nearinfrared region [1] and can be regards as best candidate for active SERS substrates. In this report, the successive ionic layer adsorption and reaction (SILAR) process will be used to synthesis Cu2S nanostructures [2] from ZnO nanorods as template deposited by electrochemical reaction. To further manipulate the different carrier densities of Cu2S nanostructuress, the adjustment of Cu vacancy in Cu2S can be accomplished by thermal processes under noble gas. Taking 4-aminothiophenol (4-ATP) as probe molecule to measure the SERS performance by Cu2S nanostructures made in this fabrication and also examines the effect on SERS by adjusting Cu vacancy under an excited wavelength of 632.8 nm and light power of 15 mW. In fact, the modulation of Cu vacancy will positively correlate to the SPR frequencies and so could get the best enhancement factor under the limited condition of excited source. Therefore, our results could provide a new opportunity to use SERS to explore the molecule-semiconductor interaction, a fundamental but essential question for designing novel devices.

Templated Synthesis of Cu2S Hollow Structures for Highly Active Ozone Decomposition

“…In addition, Raman spectroscopy characterization was performed on Cu 2 S-P before and after use, and the results are shown in Figure 9. According to the literature [48][49][50], the Raman peaks at 268 cm −1 and 472 cm −1 are attributed to Cu 2 S, while the Raman peak at 284 cm −1 is attributed to Cu 2 O. Consistent with the XPS characterization results, Raman spectroscopy shows that although there is a weak CuO signal in the catalyst after 18 h of use, Cu 2 S is still the main component, further proving the catalyst's stability.…”

Templated Synthesis of Cu₂S Hollow Structures for Highly Active Ozone Decomposition

“…In addition, Raman spectroscopy characterization was performed on Cu2S-P before and after use, and the results are shown in Figure 9. According to the literature [41][42][43], the Raman peaks at 268 cm -1 and 472 cm -1 are attributed to Cu2S, while the Raman peak at 284 cm -1 is attributed to Cu2O. Consistent with the XPS characterization results, Raman spectroscopy shows that although there is a weak CuO signal in the catalyst after 18 hours of use, Cu2S is still the main component, further proving the catalyst's stability.…”

Chiral Ceramic Nanoparticles and Peptide Catalysis

“…The observation of surface-enhanced Raman scattering (SERS) is associated with plasmonic nanostructures capable of generating so-called “hot-spots”. The latter represent locally enhanced electrical fields and have been extensively reported for the archetypal plasmonic nanostructures from noble metals, graphene, and even Cu 2 S. ,− The SERS spectrum of Rhodamine 6G (R6G) is obtained under excitation with a 532.8 nm wavelength laser when the dye was mixed with ligand-free WO 3– x ·H 2 O NPs (Figures I and S6). The SERS peaks of R6G were observed at 612, 773, 1183, 1360, 1509, and 1650 cm –1 and match previously reported values .…”