A strong electronic coupling between graphene nanosheets and layered titanate nanoplates: A soft-chemical route to highly porous nanocomposites with improved photocatalytic activity

In Young Kim, Jang Mee Lee, Tae Woo Kim, Hyo Na Kim, Hyoung Il Kim, Wonyong Choi, Seong Ju Hwang

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

Strongly coupled nanocomposites of layered titanate and reduced graphene oxide (RGO) are synthesized by electrostatically derived self-assembly between negatively charged RGO nanosheets and positively charged TiO 2 nanosols, which is then followed by a phase transition of the anatase TiO 2 component into layered titanate. The resulting nanocomposite consists of thin 2D nanoplates of lepidocrocite-type layered titanate immobilized on the surface of RGO nanosheets. The composite formation with RGO nanosheets is effective not only in promoting the phase transition of anatase TiO 2 nanosols, but also in improving the thermal stability of the layered titanate, indicating the role of RGO nanosheets as an agent for directing and stabilizing layered structures. The layered-titanate-RGO nanocomposites exhibit remarkably expanded surface area with the formation of micropores and mesopores. The composite formation with RGO nanosheets gives rise to the disappearance of the reflectance edge of layered titanate in the diffuse reflectance UV-vis spectra, indicating a strong electronic coupling between the RGO and layered titanate. The strong electronic correlation between the two components is further evidenced by the visible-light-induced generation of photocurrents after the hybridization with RGO. The layered-titanate-RGO nanocomposite shows a higher activity for the photodegradation of organic molecules than uncomposited layered titanate, underscoring the usefulness of graphene hybridization in improving the photocatalyst performance of layered titanate. The experimental findings presented here clearly demonstrate that the self-assembly of metal oxide nanoparticles with RGO 2D nanosheets is quite effective not only in synthesizing porous metal-oxide-graphene nanocomposites with improved photo-induced functionality, but also in achieving strong electronic coupling between RGO and metal oxides. Strongly coupled nanocomposites of layered titanate and reduced graphene oxide (RGO) are synthesized by self-assembly involving RGO nanosheets and TiO 2 nanosols and the following phase transformation of titania. A strong electronic coupling between the two nanospecies remarkably enhances visible light absorption. The hybridization with RGO improves the photocatalytic activity of the layered titanate for the visible-induced generation of photocurrent and the photodegradation of organic molecules.

Original languageEnglish
Pages (from-to)1038-1048
Number of pages11
JournalSmall
Volume8
Issue number7
DOIs
Publication statusPublished - 2012 Apr 10

Fingerprint

Nanocomposites
Graphite
Nanosheets
Oxides
Graphene
Self assembly
Photolysis
Phase transitions
Metals
Phase Transition
Photodegradation
Photocurrents
Titanium dioxide
Metal Nanoparticles
Light
Molecules

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

Cite this

@article{39f6b593d9a74b66b23b8ca2e2ee4bf3,
title = "A strong electronic coupling between graphene nanosheets and layered titanate nanoplates: A soft-chemical route to highly porous nanocomposites with improved photocatalytic activity",
abstract = "Strongly coupled nanocomposites of layered titanate and reduced graphene oxide (RGO) are synthesized by electrostatically derived self-assembly between negatively charged RGO nanosheets and positively charged TiO 2 nanosols, which is then followed by a phase transition of the anatase TiO 2 component into layered titanate. The resulting nanocomposite consists of thin 2D nanoplates of lepidocrocite-type layered titanate immobilized on the surface of RGO nanosheets. The composite formation with RGO nanosheets is effective not only in promoting the phase transition of anatase TiO 2 nanosols, but also in improving the thermal stability of the layered titanate, indicating the role of RGO nanosheets as an agent for directing and stabilizing layered structures. The layered-titanate-RGO nanocomposites exhibit remarkably expanded surface area with the formation of micropores and mesopores. The composite formation with RGO nanosheets gives rise to the disappearance of the reflectance edge of layered titanate in the diffuse reflectance UV-vis spectra, indicating a strong electronic coupling between the RGO and layered titanate. The strong electronic correlation between the two components is further evidenced by the visible-light-induced generation of photocurrents after the hybridization with RGO. The layered-titanate-RGO nanocomposite shows a higher activity for the photodegradation of organic molecules than uncomposited layered titanate, underscoring the usefulness of graphene hybridization in improving the photocatalyst performance of layered titanate. The experimental findings presented here clearly demonstrate that the self-assembly of metal oxide nanoparticles with RGO 2D nanosheets is quite effective not only in synthesizing porous metal-oxide-graphene nanocomposites with improved photo-induced functionality, but also in achieving strong electronic coupling between RGO and metal oxides. Strongly coupled nanocomposites of layered titanate and reduced graphene oxide (RGO) are synthesized by self-assembly involving RGO nanosheets and TiO 2 nanosols and the following phase transformation of titania. A strong electronic coupling between the two nanospecies remarkably enhances visible light absorption. The hybridization with RGO improves the photocatalytic activity of the layered titanate for the visible-induced generation of photocurrent and the photodegradation of organic molecules.",
author = "Kim, {In Young} and Lee, {Jang Mee} and Kim, {Tae Woo} and Kim, {Hyo Na} and Kim, {Hyoung Il} and Wonyong Choi and Hwang, {Seong Ju}",
year = "2012",
month = "4",
day = "10",
doi = "10.1002/smll.201101703",
language = "English",
volume = "8",
pages = "1038--1048",
journal = "Small",
issn = "1613-6810",
publisher = "Wiley-VCH Verlag",
number = "7",

}

A strong electronic coupling between graphene nanosheets and layered titanate nanoplates : A soft-chemical route to highly porous nanocomposites with improved photocatalytic activity. / Kim, In Young; Lee, Jang Mee; Kim, Tae Woo; Kim, Hyo Na; Kim, Hyoung Il; Choi, Wonyong; Hwang, Seong Ju.

In: Small, Vol. 8, No. 7, 10.04.2012, p. 1038-1048.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A strong electronic coupling between graphene nanosheets and layered titanate nanoplates

T2 - A soft-chemical route to highly porous nanocomposites with improved photocatalytic activity

AU - Kim, In Young

AU - Lee, Jang Mee

AU - Kim, Tae Woo

AU - Kim, Hyo Na

AU - Kim, Hyoung Il

AU - Choi, Wonyong

AU - Hwang, Seong Ju

PY - 2012/4/10

Y1 - 2012/4/10

N2 - Strongly coupled nanocomposites of layered titanate and reduced graphene oxide (RGO) are synthesized by electrostatically derived self-assembly between negatively charged RGO nanosheets and positively charged TiO 2 nanosols, which is then followed by a phase transition of the anatase TiO 2 component into layered titanate. The resulting nanocomposite consists of thin 2D nanoplates of lepidocrocite-type layered titanate immobilized on the surface of RGO nanosheets. The composite formation with RGO nanosheets is effective not only in promoting the phase transition of anatase TiO 2 nanosols, but also in improving the thermal stability of the layered titanate, indicating the role of RGO nanosheets as an agent for directing and stabilizing layered structures. The layered-titanate-RGO nanocomposites exhibit remarkably expanded surface area with the formation of micropores and mesopores. The composite formation with RGO nanosheets gives rise to the disappearance of the reflectance edge of layered titanate in the diffuse reflectance UV-vis spectra, indicating a strong electronic coupling between the RGO and layered titanate. The strong electronic correlation between the two components is further evidenced by the visible-light-induced generation of photocurrents after the hybridization with RGO. The layered-titanate-RGO nanocomposite shows a higher activity for the photodegradation of organic molecules than uncomposited layered titanate, underscoring the usefulness of graphene hybridization in improving the photocatalyst performance of layered titanate. The experimental findings presented here clearly demonstrate that the self-assembly of metal oxide nanoparticles with RGO 2D nanosheets is quite effective not only in synthesizing porous metal-oxide-graphene nanocomposites with improved photo-induced functionality, but also in achieving strong electronic coupling between RGO and metal oxides. Strongly coupled nanocomposites of layered titanate and reduced graphene oxide (RGO) are synthesized by self-assembly involving RGO nanosheets and TiO 2 nanosols and the following phase transformation of titania. A strong electronic coupling between the two nanospecies remarkably enhances visible light absorption. The hybridization with RGO improves the photocatalytic activity of the layered titanate for the visible-induced generation of photocurrent and the photodegradation of organic molecules.

AB - Strongly coupled nanocomposites of layered titanate and reduced graphene oxide (RGO) are synthesized by electrostatically derived self-assembly between negatively charged RGO nanosheets and positively charged TiO 2 nanosols, which is then followed by a phase transition of the anatase TiO 2 component into layered titanate. The resulting nanocomposite consists of thin 2D nanoplates of lepidocrocite-type layered titanate immobilized on the surface of RGO nanosheets. The composite formation with RGO nanosheets is effective not only in promoting the phase transition of anatase TiO 2 nanosols, but also in improving the thermal stability of the layered titanate, indicating the role of RGO nanosheets as an agent for directing and stabilizing layered structures. The layered-titanate-RGO nanocomposites exhibit remarkably expanded surface area with the formation of micropores and mesopores. The composite formation with RGO nanosheets gives rise to the disappearance of the reflectance edge of layered titanate in the diffuse reflectance UV-vis spectra, indicating a strong electronic coupling between the RGO and layered titanate. The strong electronic correlation between the two components is further evidenced by the visible-light-induced generation of photocurrents after the hybridization with RGO. The layered-titanate-RGO nanocomposite shows a higher activity for the photodegradation of organic molecules than uncomposited layered titanate, underscoring the usefulness of graphene hybridization in improving the photocatalyst performance of layered titanate. The experimental findings presented here clearly demonstrate that the self-assembly of metal oxide nanoparticles with RGO 2D nanosheets is quite effective not only in synthesizing porous metal-oxide-graphene nanocomposites with improved photo-induced functionality, but also in achieving strong electronic coupling between RGO and metal oxides. Strongly coupled nanocomposites of layered titanate and reduced graphene oxide (RGO) are synthesized by self-assembly involving RGO nanosheets and TiO 2 nanosols and the following phase transformation of titania. A strong electronic coupling between the two nanospecies remarkably enhances visible light absorption. The hybridization with RGO improves the photocatalytic activity of the layered titanate for the visible-induced generation of photocurrent and the photodegradation of organic molecules.

UR - http://www.scopus.com/inward/record.url?scp=84859620466&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859620466&partnerID=8YFLogxK

U2 - 10.1002/smll.201101703

DO - 10.1002/smll.201101703

M3 - Article

C2 - 22323425

AN - SCOPUS:84859620466

VL - 8

SP - 1038

EP - 1048

JO - Small

JF - Small

SN - 1613-6810

IS - 7

ER -