Abstract
In this report, pristine TiO2 nanowire (NW) and gold (Au) nanoparticles (NP) decorated TiO2-NW are synthesized by glancing angle deposition (GLAD) technique on Si substrate. Transmission electron microscopy (TEM) exhibits the vertical growth of TiO2-NW. The average length and diameter of TiO2-NWs are ∼110 nm and ∼15 nm, respectively and Au-NP has an average diameter of ∼7 nm. Selected area electron diffraction (SAED) and x-ray diffraction (XRD) analyses confirm the polycrystalline nature of synthesized TiO2-NW and Au-NP. Photoluminescence (PL) emission is reduced for the sample Au-NP:TiO2-NW as compared to TiO2-NW. The enhanced Raman scattering and optical absorption are observed for the sample Au-NP:TiO2-NW compared to TiO2-NW. Improved performance in terms of current density, responsivity, detectivity, noise equivalent power (NEP), and photo-switching were obtained for device Au-NP:TiO2-NW as compared to TiO2-NW in both UV and visible region. The superior performances of the Au-NP:TiO2-NW device establishes it as a potential and promising candidate for photodetector application.
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