Preparation and enhanced nonlinear optical properties of Bi2S3/RGO composite materials

Facile Synthesis and Photoelectrochemical Performance of a Bi2S3@rGO Nanocomposite Photoanode for Efficient Water Splitting

“…According to this process, Bi 3+ ions can easily form a complex with GO sheets by electrostatic force. − Typically, GO sheets contain carboxyl and hydroxyl functional groups with negative charges. On the other hand, the sulfur source (Na 2 S) releases S 2– ions, which combine with Bi 3+ ions on the GO sheet to form the Bi 2 S 3 –GO intermediate. − Finally, GO is effectively reduced to rGO by the addition of hydrazine hydrate to form a Bi 2 S 3 @rGO composite. The detailed synthesis approaches of GO and rGO are presented in the Supporting Information (SI).…”

“…To further examine the presence of rGO in the Bi 2 S 3 @rGO composite material, Raman spectral analysis was performed and results are displayed in Figure b. Raman spectra of pure Bi 2 S 3 NRs show Raman bands at 255, 438, and 965 cm –1 , corresponding to Bi–S stretching vibrations confirming the orthorhombic structure of Bi 2 S 3 , which agrees well with XRD results and previous reports on the Raman spectrum of Bi 2 S 3 . ,,, The Raman spectrum of the Bi 2 S 3 @rGO composite shows two extra peaks at 1331 and 1576 cm –1 , which correspond to the defective (D-) and graphitic (G-) bands of rGO sheets, indicating rGO sheets are in good connection with the Bi 2 S 3 lattice. The Raman spectra of GO and rGO samples are shown in Figure S1b; for GO, two typical peaks are positioned at 1347 and 1589 cm –1 , which are related to the D- and G-bands, respectively .…”

“…Similarly, the Bi 2 S 3 @rGO composite was also prepared via the identical route in the presence of graphene oxide (GO) powder (30 mg) as a graphene source. According to this process, Bi 3+ ions can easily form a complex with GO sheets by electrostatic force. − Typically, GO sheets contain carboxyl and hydroxyl functional groups with negative charges. On the other hand, the sulfur source (Na 2 S) releases S 2– ions, which combine with Bi 3+ ions on the GO sheet to form the Bi 2 S 3 –GO intermediate. − Finally, GO is effectively reduced to rGO by the addition of hydrazine hydrate to form a Bi 2 S 3 @rGO composite.…”

Local-Field-Dependent Nonlinear Optical Absorption of Black Phosphorus Nanoflakes Hybridized by Silver Nanoparticles

“…However, to the best of our knowledge, the study of the effect on the nonlinear optical properties of BPNFs by adding other complexes besides the above-mentioned Se and LiH is still in its initial stage, and the current study has not yet explored in depth the clear mechanism of the effect of the complexes on the nonlinear response of BPNFs. In our previous work, it was found that the improvement of nonlinear optical response could be achieved by surface modification of G. − Meanwhile, it has been found that graphene modified by metal nanoparticles also exhibits excellent nonlinear processes. − This enhancement effect can be explained by the carrier dynamics technique analysis and the local field effects generated by the plasma. Motivated by the high carrier mobility of BPNFs and the large plasma effect of metal nanoparticles, as well as the rare investigation of the nonlinear absorption properties of BPNF–metal nanohybrids, we believe that it is of necessity and significance to study the nonlinear optical properties of the BPNF-based plasma structures.…”

Third-order nonlinear optical properties of CuS/reduced graphene oxide nanocomposites

“…Recent studies shown that physical or chemical treatment for graphene by functional modification can improve the NLO properties [1,2]. Some studies also shown graphene hybrid nanostructure materials composed of semiconductor materials, such as graphene (G)/ZnO, G/MoSe2, graphene oxide (GO)/ZnS, rGO/Bi2S3, rGO/CdSe, and rGO/a-MnS [3][4][5][6][7][8], have better NLO performance. As a self-doped P-type semiconductor material, CuS has a bandwidth between 1.2 eV and 2.0 eV.…”