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Your search keyword '"Sekar, Karthikeyan"' showing total 4 results
Start Over Author "Sekar, Karthikeyan" Journal new journal of chemistry
4 results on '"Sekar, Karthikeyan"'

1. In situ preparation of a nanocomposite comprising graphene and α-Fe2O3 nanospindles for the photo-degradation of antibiotics under visible light

Author

Gopala Ram Bhadu, Tejwant Singh Kang, Sekar Karthikeyan, Komal Arora, Manvir Kaur, Bilal Ahmad Shiekh, and Harjinder Singh

Subjects
Nanocomposite, Graphene, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Catalysis, 0104 chemical sciences, law.invention, Photoexcitation, chemistry.chemical_compound, chemistry, Chemical engineering, law, Ionic liquid, Dispersion stability, Materials Chemistry, Photocatalysis, 0210 nano-technology, Photodegradation, Visible spectrum
Abstract

Few layer thick graphene sheets are exfoliated in an aqueous medium by using iron containing imidazolium based ionic liquid (IL; [C16mim][FeCl4]) in high yield exhibiting excellent dispersion stability. Subsequently, IL that stabilizes the graphene sheets is exploited for the in situ preparation of α-Fe2O3 nanospindle (NS) decorated graphene sheets, for the first time. The prepared α-Fe2O3@graphene nanocomposite (NC) shows enhanced photocatalytic activity for the degradation of an antibiotic, sulfamethoxazole, under visible light. The enhanced photocatalytic activity of the NCs as compared to bare α-Fe2O3 NSs is probed using computational simulations, where graphene is observed to sensitize α-Fe2O3 NSs in the photoexcitation process. This increases the electron charge density in the conduction band of α-Fe2O3 NSs, resulting in enhanced photocatalytic efficiency.

Published
2020

4. A carbon nanowire-promoted Cu2O/TiO2 nanocomposite for enhanced photoelectrochemical performance.

Author

Ahmed, Kassam, Wang, Yuyin, Bai, Yang, Sekar, Karthikeyan, and Li, Wei

Subjects
CARBON nanowires, HETEROJUNCTIONS, NANOCOMPOSITE materials, ELECTRON microscopes, LIGHT absorbance, CHARGE transfer, COSMIC abundances
Abstract

The use of semiconductors as photoelectrochemical electrodes and photocatalysts has been studied extensively over the last few decades; however, it is challenging to design one single material meeting a wide range of requirements for applications such as photostability, wide light absorbance and earth abundance. In this study, we started with earth-abundant materials, namely TiO2, Cu2O and carbon, to design a nanocomposite with TiO2 nanofibers (NFs) and Cu2O nanocubes (NCs) connected by carbon nanowires (NWs). The nanocomposite (C/TiO2/Cu2O) demonstrated excellent photo(electro)activity under simulated visible light as well as enhanced durability. Morphologies imaged by electron microscopes showed that TiO2 NFs and Cu2O NCs were well connected, while thin and long carbon NWs were present throughout the samples and connected the NFs and NCs to form a compact composite. Electrochemical analysis revealed that the band alignment between TiO2 and Cu2O was typical for a type-II heterojunction, which is favourable for the separation of photogenerated charge carriers. Moreover, carbon NWs act as bridges, thus facilitating more efficient charge transfer. Overall, this research showed the design and preparation of a nanostructured composite with improved charge transfer and photostability for solar photoelectrochemical applications. [ABSTRACT FROM AUTHOR]

Published
2022
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