One-Step In Situ Patternable Reduction of a Ag–rGO Hybrid Using Temporally Shaped Femtosecond Pulses

Abstract

In recent years, metallic nanoparticle (NP)–two-dimensional material hybrids have been widely used for photocatalysis and photoreduction. Here, we introduce a femtosecond laser reduction approach that relies on the repetitive ablation of recast layers by usi–ng temporally shaped pulses to achieve the fast fabrication of metallic NP–two-dimensional material hybrids. We selectively deposited silver-reduced graphene oxide (Ag–rGO) hybrids on different substrates under various fabrication conditions. The deposition of the hybrids was attributed to the redistribution of the cooling ejected plume after multiple radiation pulses and the exchange of carriers with ejected plume ions containing activated species such as small carbon clusters and H2O. The proposed one-step in situ fabrication method is a competitive fabrication process that eliminates the additive separation process and exhibits morphological controllability. The Ag–rGO hybrids demonstrate considerable potential for chemomolecular and biomolecular detection because the surface-enhanced Raman scattering signal of the enhancement factor reached 4.04 × 108.

Flower-like Ag-decked non-stoichiometric Bi2O3−x/rGO hybrid nanocomposite SERS substrates for an effective detection of Rhodamine 6G dye molecules

“…In our rGO-Ag-Bi 2 O 3 /Bi 2 O 3− x substrate, the enhancement factor is better and comparable with that of the rGO-Ag substrate that was reported previously. 60 a ,66,67 Hence, the superior SERS enhancement in rGO-Ag-Bi 2 O 3 /Bi 2 O 2.75 is due to the synergistic effect of the PICT among the non-stoichiometric rGO-Bi 2 O 3 /Bi 2 O 2.75 system, plasmonic effect of Ag, molecular resonance or SERRS effect in R6G due to the excitation of 532 nm laser and exciton resonance in Bi 2 O 3 /Bi 2 O 2.75 .…”