Thermal deoxygenation causes photoluminescence shift from UV to blue region in lyophilized graphene oxide

Veeresh Kumar; Vivek Kumar; G. B. Reddy; Renu Pasricha

doi:10.1039/c5ra12793a

Thermal deoxygenation causes photoluminescence shift from UV to blue region in lyophilized graphene oxide

Veeresh Kumar, Vivek Kumar, G. B. Reddy, Renu Pasricha

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Abstract

Lyophilized graphene oxide (GO) was thermally exfoliated in stages at predefined temperatures up to 400°C, and photoluminescence (PL) study of GO and thermally reduced GO (TGO) was carried out at each step. A significant red shift in the PL emission peak (412 nm) was found on annealing GO at 400°C in comparison to as-synthesized GO (365 nm). In addition, the PL emission at 457 nm in case of as synthesized GO, which is related to topological defects was quenched conspicuously. Samples were characterized using X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy, Fourier-transform infrared (FTIR) spectroscopy and Raman spectroscopy. Morphological characterization was performed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The detailed analysis presented might help in highlighting and understanding the structural changes related to deoxygenation and the PL emission mechanism of graphene derivatives synthesized at lower temperatures. The study can also be used a tool for comprehending tunable PL emissions for future optoelectronic applications.

Original language	English (US)
Pages (from-to)	74342-74346
Number of pages	5
Journal	RSC Advances
Volume	5
Issue number	91
DOIs	https://doi.org/10.1039/c5ra12793a
State	Published - Aug 17 2015

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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title = "Thermal deoxygenation causes photoluminescence shift from UV to blue region in lyophilized graphene oxide",

abstract = "Lyophilized graphene oxide (GO) was thermally exfoliated in stages at predefined temperatures up to 400°C, and photoluminescence (PL) study of GO and thermally reduced GO (TGO) was carried out at each step. A significant red shift in the PL emission peak (412 nm) was found on annealing GO at 400°C in comparison to as-synthesized GO (365 nm). In addition, the PL emission at 457 nm in case of as synthesized GO, which is related to topological defects was quenched conspicuously. Samples were characterized using X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy, Fourier-transform infrared (FTIR) spectroscopy and Raman spectroscopy. Morphological characterization was performed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The detailed analysis presented might help in highlighting and understanding the structural changes related to deoxygenation and the PL emission mechanism of graphene derivatives synthesized at lower temperatures. The study can also be used a tool for comprehending tunable PL emissions for future optoelectronic applications.",

author = "Veeresh Kumar and Vivek Kumar and Reddy, {G. B.} and Renu Pasricha",

note = "Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2015.",

year = "2015",

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doi = "10.1039/c5ra12793a",

language = "English (US)",

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T1 - Thermal deoxygenation causes photoluminescence shift from UV to blue region in lyophilized graphene oxide

AU - Kumar, Veeresh

AU - Kumar, Vivek

AU - Reddy, G. B.

AU - Pasricha, Renu

N1 - Publisher Copyright: © The Royal Society of Chemistry 2015.

PY - 2015/8/17

Y1 - 2015/8/17

N2 - Lyophilized graphene oxide (GO) was thermally exfoliated in stages at predefined temperatures up to 400°C, and photoluminescence (PL) study of GO and thermally reduced GO (TGO) was carried out at each step. A significant red shift in the PL emission peak (412 nm) was found on annealing GO at 400°C in comparison to as-synthesized GO (365 nm). In addition, the PL emission at 457 nm in case of as synthesized GO, which is related to topological defects was quenched conspicuously. Samples were characterized using X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy, Fourier-transform infrared (FTIR) spectroscopy and Raman spectroscopy. Morphological characterization was performed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The detailed analysis presented might help in highlighting and understanding the structural changes related to deoxygenation and the PL emission mechanism of graphene derivatives synthesized at lower temperatures. The study can also be used a tool for comprehending tunable PL emissions for future optoelectronic applications.

AB - Lyophilized graphene oxide (GO) was thermally exfoliated in stages at predefined temperatures up to 400°C, and photoluminescence (PL) study of GO and thermally reduced GO (TGO) was carried out at each step. A significant red shift in the PL emission peak (412 nm) was found on annealing GO at 400°C in comparison to as-synthesized GO (365 nm). In addition, the PL emission at 457 nm in case of as synthesized GO, which is related to topological defects was quenched conspicuously. Samples were characterized using X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy, Fourier-transform infrared (FTIR) spectroscopy and Raman spectroscopy. Morphological characterization was performed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The detailed analysis presented might help in highlighting and understanding the structural changes related to deoxygenation and the PL emission mechanism of graphene derivatives synthesized at lower temperatures. The study can also be used a tool for comprehending tunable PL emissions for future optoelectronic applications.

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JO - RSC Advances

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Thermal deoxygenation causes photoluminescence shift from UV to blue region in lyophilized graphene oxide

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