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Charge transfer induced tunable bandgap and enhanced saturable absorption behavior in rGO/WO3 composites

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Abstract

In this present work, we synthesized reduced graphene oxide/Tungsten trioxide (rGO/WO3) nanocomposites through hydrothermal method. We discussed the implication of charge transfer between Tungsten trioxide (WO3) and reduced graphene oxide (rGO) through steady-state fluorescence quenching with fitting. In addition, we report nonlinear optical (NLO) properties of GO, WO3 and rGO/WO3 at 532 nm employing the open aperture Z Scan technique. UV spectroscopy reveals the bandgap variation due to rGO addition. The rGO/WO3 nanohybrids shows the low saturation intensity Is and 0.5 × 1011 W/m2 compared to the WO3 saturation intensity Is ~ 1 × 1013 W/m2. The results displays that the effective charge transfer between WO3 and rGO leads to the band-gap variation and enhances the SA performance of the nanohybrids. Results shows that these nanohybrids are potentially useful for mode locking, optical switching and as a saturable absorber. Moreover, the structural property was confirmed by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) images supports the nanohybrids as nanorods and vibrational properties were analyzed by Fourier transformed Infrared Spectroscopy (FTIR) technique.

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  1. Nanophotonics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli, 620015, India

    Venkadeshkumar Ramar & Karthikeyan Balasubramanian

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  1. Venkadeshkumar Ramar
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  2. Karthikeyan Balasubramanian
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Ramar, V., Balasubramanian, K. Charge transfer induced tunable bandgap and enhanced saturable absorption behavior in rGO/WO3 composites. Appl. Phys. A 124, 779 (2018). https://doi.org/10.1007/s00339-018-2191-3

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