Squaraine-sensitized composite of a reduced graphene oxide/Tio2 photocatalyst π Stacking as a new method of dye anchoring

K. L.Vincent Joseph, Jonghun Lim, A. Anthonysamy, Hyoung Il Kim, Wonyong Choi, Jin Kon Kim

Research output: Contribution to journalArticle

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Abstract

We synthesized a near infra-red (NIR)-absorbing squaraine dye (VJ-S) showing strong absorption and emission maxima at 684 and 704 nm, respectively, with a high molar extinction coefficient (ε) of 1.277 × 105 M-1 cm-1 and a band gap of 1.77 eV. Its oxidation and reduction potentials were found to be 0.889 and -0.795 V, respectively, with HOMO and LUMO levels of -5.21 and -3.53 eV, respectively. We also prepared the self-assembled core/shell nanocomposite r-NGOT, where TiO2 is the core and reduced nano-sized graphene oxide (r-NGO) is the shell. When VJ-S was anchored on r-NGOT, it showed π-π stacking with r-NGO, which is confirmed by Fourier-transformed infrared spectroscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and electron energy loss spectroscopy. The optical absorption spectrum of the VJ-S/r-NGOT nanocomposite measured with diffuse reflectance UV/visible absorption spectroscopy covers the whole range of visible light wavelengths up to 800 nm. The photocatalytic activity of VJ-S/r-NGOT at visible light wavelengths (λ > 420 nm) is much higher than that of r-NGOT alone. This journal is

Original languageEnglish
Pages (from-to)232-239
Number of pages8
JournalJournal of Materials Chemistry A
Volume3
Issue number1
DOIs
Publication statusPublished - 2015 Jan 7

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Photocatalysts
Oxides
Graphene
Nanocomposites
Coloring Agents
Dyes
Wavelength
Electron energy loss spectroscopy
Composite materials
High resolution transmission electron microscopy
Absorption spectroscopy
Light absorption
Absorption spectra
Infrared spectroscopy
Energy gap
X ray photoelectron spectroscopy
Infrared radiation
Oxidation
squaraine

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Joseph, K. L.Vincent ; Lim, Jonghun ; Anthonysamy, A. ; Kim, Hyoung Il ; Choi, Wonyong ; Kim, Jin Kon. / Squaraine-sensitized composite of a reduced graphene oxide/Tio2 photocatalyst π Stacking as a new method of dye anchoring. In: Journal of Materials Chemistry A. 2015 ; Vol. 3, No. 1. pp. 232-239.
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Squaraine-sensitized composite of a reduced graphene oxide/Tio2 photocatalyst π Stacking as a new method of dye anchoring. / Joseph, K. L.Vincent; Lim, Jonghun; Anthonysamy, A.; Kim, Hyoung Il; Choi, Wonyong; Kim, Jin Kon.

In: Journal of Materials Chemistry A, Vol. 3, No. 1, 07.01.2015, p. 232-239.

Research output: Contribution to journalArticle

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T1 - Squaraine-sensitized composite of a reduced graphene oxide/Tio2 photocatalyst π Stacking as a new method of dye anchoring

AU - Joseph, K. L.Vincent

AU - Lim, Jonghun

AU - Anthonysamy, A.

AU - Kim, Hyoung Il

AU - Choi, Wonyong

AU - Kim, Jin Kon

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N2 - We synthesized a near infra-red (NIR)-absorbing squaraine dye (VJ-S) showing strong absorption and emission maxima at 684 and 704 nm, respectively, with a high molar extinction coefficient (ε) of 1.277 × 105 M-1 cm-1 and a band gap of 1.77 eV. Its oxidation and reduction potentials were found to be 0.889 and -0.795 V, respectively, with HOMO and LUMO levels of -5.21 and -3.53 eV, respectively. We also prepared the self-assembled core/shell nanocomposite r-NGOT, where TiO2 is the core and reduced nano-sized graphene oxide (r-NGO) is the shell. When VJ-S was anchored on r-NGOT, it showed π-π stacking with r-NGO, which is confirmed by Fourier-transformed infrared spectroscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and electron energy loss spectroscopy. The optical absorption spectrum of the VJ-S/r-NGOT nanocomposite measured with diffuse reflectance UV/visible absorption spectroscopy covers the whole range of visible light wavelengths up to 800 nm. The photocatalytic activity of VJ-S/r-NGOT at visible light wavelengths (λ > 420 nm) is much higher than that of r-NGOT alone. This journal is

AB - We synthesized a near infra-red (NIR)-absorbing squaraine dye (VJ-S) showing strong absorption and emission maxima at 684 and 704 nm, respectively, with a high molar extinction coefficient (ε) of 1.277 × 105 M-1 cm-1 and a band gap of 1.77 eV. Its oxidation and reduction potentials were found to be 0.889 and -0.795 V, respectively, with HOMO and LUMO levels of -5.21 and -3.53 eV, respectively. We also prepared the self-assembled core/shell nanocomposite r-NGOT, where TiO2 is the core and reduced nano-sized graphene oxide (r-NGO) is the shell. When VJ-S was anchored on r-NGOT, it showed π-π stacking with r-NGO, which is confirmed by Fourier-transformed infrared spectroscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and electron energy loss spectroscopy. The optical absorption spectrum of the VJ-S/r-NGOT nanocomposite measured with diffuse reflectance UV/visible absorption spectroscopy covers the whole range of visible light wavelengths up to 800 nm. The photocatalytic activity of VJ-S/r-NGOT at visible light wavelengths (λ > 420 nm) is much higher than that of r-NGOT alone. This journal is

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