Highly Photoactive, Low Bandgap TiO₂ Nanoparticles Wrapped by Graphene

Abstract

Highly photoactive, graphene-wrapped anatase TiO(2) nanoparticles are synthesized through one-step hydrothermal reduction of graphene oxide (GO) and TiO(2) crystallization from GO-wrapped amorphous TiO(2) NPs. Graphene-TiO(2) nanoparticles exhibit a red-shift of the band-edge and a significant reduction of the bandgap (2.80 eV). Graphene-TiO(2) nanoparticles possess excellent photocatalytic properties under visible light for the degradation of methylene blue.

Graphene Oxide Wrapped SERS Tags: Multifunctional Platforms toward Optical Labeling, Photothermal Ablation of Bacteria, and the Monitoring of Killing Effect

“…Interestingly, GO sheets were found wrapped on the compact Au NP clusters, which could be clearly observed in both the TEM and the FE-SEM images, indicated by the arrows (Figure 1k,l). Similar wrapping shells were reported in other hybrids composed of GO and Au NPs, 30 metal oxide, 35 anatase TiO 2 , 36 and mesoporous silica, 37 which provided protective functions for the encapsulated NPs. The hydrodynamic size of the Au@ Rubpy/S-GO and Au@Rubpy/L-GO tags in water measured by DLS was determined to be 111.6 and 192.8 nm, respectively (Figure 1g,j), which is smaller than those of the Rubpy/GO precursors (132.6 and 346.5 nm, respectively) shown in Figure S2 (Supporting Information).…”

TiO2 porous ceramic/Ag–AgCl composite for enhanced photocatalytic degradation of dyes under visible light irradiation

“…TiO 2 displays typical diffraction peaks of TiO 2 anatase phase (JCPDS file no. : 21-1272) [27,28]. The diffraction peaks at 2θ values of 25.4°, 37.9°, 48.1°, 53.8°, 55.1°and 62.7° could be assigned to the (101), (004), (200), (105), (201) and (204) crystalline phase of anatase TiO 2 .…”

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

“…In fact, they act as a nucleation point for grooving and anchoring semiconductor nanocrystals. The successive reduction of GO generates GTiO 2 Ns with homogeneous distribution on 2D nanosheets, thereby promoting the direct interaction between semiconductor nanocrystals and G. For this reason, various methods, such as mixing, hydrothermal/solvothermal methods, sol-gel, electrochemical deposition, combustion, microwave, photo-assisted reduction, and self-assemble approaches, can be applied for the synthesis of GTiO 2 Ns [66,170,171].…”