Fig. 1 | Nature Communications

Fig. 1

From: Narrow bandgap oxide nanoparticles coupled with graphene for high performance mid-infrared photodetection

Fig. 1

Hybrid graphene/Ti2O3 nanoparticle mid-infrared photodetector. a A schematic diagram of hybrid graphene/Ti2O3 nanoparticle photodetector. b Illustration of the interface between Ti2O3 nanoparticles and graphene. c Crystal structure of corundum Ti2O3. d, e Density of states (DOS) of Ti2O3 and TiO2 derived from first principle calculations, respectively. Blue and red areas represent O 2p and Ti 3d orbitals, respectively. f Schematic band diagram of Ti2O3, indicating that a narrow bandgap is formed between upper Hubbard band (pink) and lower Hubbard band (blue) as a result of strong electron correlation. g Absorption spectrum of Ti2O3 nanoparticles drop-casted on a KBr substrate, measured through Fourier Transform Infrared Spectroscopy. The cut-off wavelength is about 13.3 µm, which corresponds to a band gap of 0.09 eV. The inset is a photo of TiO2 and in Ti2O3 nanoparticles in ether solution

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