Graphene-enhanced Raman imaging of TiO 2 nanoparticles

Denys Naumenko; Valentinas Snitka; Boris Snopok; Sanna Arpiainen; Harri Lipsanen

doi:10.1088/0957-4484/23/46/465703

Graphene-enhanced Raman imaging of TiO ₂ nanoparticles

Denys Naumenko^*, Valentinas Snitka, Boris Snopok, Sanna Arpiainen, Harri Lipsanen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The interaction of anatase titanium dioxide (TiO ₂) nanoparticles with chemical vapour deposited graphene sheets transferred on glass substrates is investigated by using atomic force microscopy, Raman spectroscopy and imaging. Significant electronic interactions between the nanoparticles of TiO ₂ and graphene were found. The changes in the graphene Raman peak positions and intensity ratios indicate that charge transfer between graphene and TiO ₂ nanoparticles occurred, increasing the Raman signal of the TiO ₂ nanoparticles up to five times. The normalized Raman intensity of TiO ₂ nanoparticles per their volume increased with the disorder of the graphene structure. The complementary reason for the observed enhancement is that due to the higher density of states in the defect sites of graphene, a higher electron transfer occurs from the graphene to the anatase TiO ₂ nanoparticles.

Original language	English
Article number	465703
Journal	Nanotechnology
Volume	23
Issue number	46
DOIs	https://doi.org/10.1088/0957-4484/23/46/465703
Publication status	Published - 23 Nov 2012
Externally published	Yes

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

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title = "Graphene-enhanced Raman imaging of TiO 2 nanoparticles",

abstract = "The interaction of anatase titanium dioxide (TiO 2) nanoparticles with chemical vapour deposited graphene sheets transferred on glass substrates is investigated by using atomic force microscopy, Raman spectroscopy and imaging. Significant electronic interactions between the nanoparticles of TiO 2 and graphene were found. The changes in the graphene Raman peak positions and intensity ratios indicate that charge transfer between graphene and TiO 2 nanoparticles occurred, increasing the Raman signal of the TiO 2 nanoparticles up to five times. The normalized Raman intensity of TiO 2 nanoparticles per their volume increased with the disorder of the graphene structure. The complementary reason for the observed enhancement is that due to the higher density of states in the defect sites of graphene, a higher electron transfer occurs from the graphene to the anatase TiO 2 nanoparticles.",

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AU - Naumenko, Denys

AU - Snitka, Valentinas

AU - Snopok, Boris

AU - Arpiainen, Sanna

AU - Lipsanen, Harri

PY - 2012/11/23

Y1 - 2012/11/23

N2 - The interaction of anatase titanium dioxide (TiO 2) nanoparticles with chemical vapour deposited graphene sheets transferred on glass substrates is investigated by using atomic force microscopy, Raman spectroscopy and imaging. Significant electronic interactions between the nanoparticles of TiO 2 and graphene were found. The changes in the graphene Raman peak positions and intensity ratios indicate that charge transfer between graphene and TiO 2 nanoparticles occurred, increasing the Raman signal of the TiO 2 nanoparticles up to five times. The normalized Raman intensity of TiO 2 nanoparticles per their volume increased with the disorder of the graphene structure. The complementary reason for the observed enhancement is that due to the higher density of states in the defect sites of graphene, a higher electron transfer occurs from the graphene to the anatase TiO 2 nanoparticles.

AB - The interaction of anatase titanium dioxide (TiO 2) nanoparticles with chemical vapour deposited graphene sheets transferred on glass substrates is investigated by using atomic force microscopy, Raman spectroscopy and imaging. Significant electronic interactions between the nanoparticles of TiO 2 and graphene were found. The changes in the graphene Raman peak positions and intensity ratios indicate that charge transfer between graphene and TiO 2 nanoparticles occurred, increasing the Raman signal of the TiO 2 nanoparticles up to five times. The normalized Raman intensity of TiO 2 nanoparticles per their volume increased with the disorder of the graphene structure. The complementary reason for the observed enhancement is that due to the higher density of states in the defect sites of graphene, a higher electron transfer occurs from the graphene to the anatase TiO 2 nanoparticles.

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Graphene-enhanced Raman imaging of TiO ₂ nanoparticles

Abstract

ASJC Scopus subject areas

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