Effects of the phase, morphology, band gap and hydrogen evolution of vanadium oxide with reduced graphene oxide

Kambhala, Nagaiah; Kaveramma, A.B.; Angappane, S.; Rani, Ruma; Thiyagaraj, S.; Akkera, Harish Sharma

doi:10.1016/j.mtcomm.2023.105478

Cited by 2 publications

(1 citation statement)

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“…Explicitly, understanding the electronic transitions and bandgap of these materials is important for optimizing their performance in electronic and photonic devices, designing functional materials, and identifying potential applications. The bandgap of GO and rGO can be estimated using various techniques, including X-ray photoelectron spectroscopy (XPS) and UV-visible spectroscopy ( Baragau et al, 2023 ; Nagaiah et al, 2023 ). In particular, the Tauc method, which is widely used for estimating the bandgap of semiconducting materials from the absorption spectrum, has also been applied to GO and rGO in several studies ( Aragaw, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Optical properties of graphene oxide

et al. 2023

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The study of the optical properties of graphene oxide (GO) is crucial in designing functionalized GO materials with specific optical properties for various applications such as (bio) sensors, optoelectronics, and energy storage. The present work aims to investigate the electronic transitions, optical bandgap, and absorption coefficient of GO under different conditions. Specifically, the study examines the effects of drying times ranging from 0 to 120 h while maintaining a fixed temperature of 80°C and low temperatures ranging from 40℃ to 100℃, with a constant drying time of 24 h. Our findings indicate that exposing the GO sample to a drying time of up to 120 h at 80°C can lead to a reduction in the optical bandgap, decreasing it from 4.09 to 2.76 eV. The π−π* transition was found to be the most affected, shifting from approximately 230 nm at 0 h to 244 nm after 120 h of drying time. Absorption coefficients of 3140–5507 ml mg−1 m−1 were measured, which are similar to those reported for exfoliated graphene dispersions but up to two times higher, confirming the improved optical properties of GO. Our findings can provide insights into determining the optimal temperature and duration required for transforming GO into its reduced form for a specific application through extrapolation. The study is complemented by analyzing the elemental composition, surface morphology change, and electrical properties.

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Section: Introductionmentioning

confidence: 99%