Embossed TiO2 thin films with tailored links between hollow hemispheres: Synthesis and gas-sensing properties

Hi Gyu Moon, Young Seok Shim, Dong Su, Hyung-Ho Park, Seok Jin Yoon, Ho Won Jang

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Embossed TiO2 thin films with high surface areas were achieved using soft templates composed ofmonolayer polystyrene beads.The structure of links between beads in the templates could be controlled by varying O2 plasma etching time, resulting in a variety of templates with close-linked, nanolinked, or isolated beads. Room-temperature deposition of TiO2 on the plasma-treated templates and calcination at 550 °C resulted in embossed films with tailored links between anatase TiO2 hollow hemispheres. Although all embossed TiO2 films displayed a similar increase in the surface-to-volume ratio compared with a plain TiO2 thin film, the response of embossed TiO2 films with nanolinked hollow hemispheres to CO or ethanol gases was much higher than the response of films with close-linked or isolated hollow hemispheres. The strong correlation between gas sensitivity and the structure of links between the TiO2 hollow hemispheres revealed the critical importance of tailoring links between individual oxide nanostructures for enhancing gas-sensing properties of the ensemble of the individual nanostructures. The facile and large-scale synthesis of embossed TiO2 films with nanolinked hollow hemispheres on Si substrates and the high sensitivity that is achieved without the aid of additives provide a sustainable competitive advantage over other methods for fabricating highly sensitive metal oxide gas sensors.

Original languageEnglish
Pages (from-to)9993-9999
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number20
DOIs
Publication statusPublished - 2011 May 26

Fingerprint

hemispheres
hollow
Gases
Thin films
templates
beads
synthesis
thin films
gases
Oxides
Nanostructures
Plasma etching
Polystyrenes
plasma etching
Carbon Monoxide
Chemical sensors
plains
anatase
Calcination
roasting

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Moon, Hi Gyu ; Shim, Young Seok ; Su, Dong ; Park, Hyung-Ho ; Yoon, Seok Jin ; Jang, Ho Won. / Embossed TiO2 thin films with tailored links between hollow hemispheres : Synthesis and gas-sensing properties. In: Journal of Physical Chemistry C. 2011 ; Vol. 115, No. 20. pp. 9993-9999.
@article{bcd71d8fe76a47819a4bcad306b6f6b1,
title = "Embossed TiO2 thin films with tailored links between hollow hemispheres: Synthesis and gas-sensing properties",
abstract = "Embossed TiO2 thin films with high surface areas were achieved using soft templates composed ofmonolayer polystyrene beads.The structure of links between beads in the templates could be controlled by varying O2 plasma etching time, resulting in a variety of templates with close-linked, nanolinked, or isolated beads. Room-temperature deposition of TiO2 on the plasma-treated templates and calcination at 550 °C resulted in embossed films with tailored links between anatase TiO2 hollow hemispheres. Although all embossed TiO2 films displayed a similar increase in the surface-to-volume ratio compared with a plain TiO2 thin film, the response of embossed TiO2 films with nanolinked hollow hemispheres to CO or ethanol gases was much higher than the response of films with close-linked or isolated hollow hemispheres. The strong correlation between gas sensitivity and the structure of links between the TiO2 hollow hemispheres revealed the critical importance of tailoring links between individual oxide nanostructures for enhancing gas-sensing properties of the ensemble of the individual nanostructures. The facile and large-scale synthesis of embossed TiO2 films with nanolinked hollow hemispheres on Si substrates and the high sensitivity that is achieved without the aid of additives provide a sustainable competitive advantage over other methods for fabricating highly sensitive metal oxide gas sensors.",
author = "Moon, {Hi Gyu} and Shim, {Young Seok} and Dong Su and Hyung-Ho Park and Yoon, {Seok Jin} and Jang, {Ho Won}",
year = "2011",
month = "5",
day = "26",
doi = "10.1021/jp2020325",
language = "English",
volume = "115",
pages = "9993--9999",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "20",

}

Embossed TiO2 thin films with tailored links between hollow hemispheres : Synthesis and gas-sensing properties. / Moon, Hi Gyu; Shim, Young Seok; Su, Dong; Park, Hyung-Ho; Yoon, Seok Jin; Jang, Ho Won.

In: Journal of Physical Chemistry C, Vol. 115, No. 20, 26.05.2011, p. 9993-9999.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Embossed TiO2 thin films with tailored links between hollow hemispheres

T2 - Synthesis and gas-sensing properties

AU - Moon, Hi Gyu

AU - Shim, Young Seok

AU - Su, Dong

AU - Park, Hyung-Ho

AU - Yoon, Seok Jin

AU - Jang, Ho Won

PY - 2011/5/26

Y1 - 2011/5/26

N2 - Embossed TiO2 thin films with high surface areas were achieved using soft templates composed ofmonolayer polystyrene beads.The structure of links between beads in the templates could be controlled by varying O2 plasma etching time, resulting in a variety of templates with close-linked, nanolinked, or isolated beads. Room-temperature deposition of TiO2 on the plasma-treated templates and calcination at 550 °C resulted in embossed films with tailored links between anatase TiO2 hollow hemispheres. Although all embossed TiO2 films displayed a similar increase in the surface-to-volume ratio compared with a plain TiO2 thin film, the response of embossed TiO2 films with nanolinked hollow hemispheres to CO or ethanol gases was much higher than the response of films with close-linked or isolated hollow hemispheres. The strong correlation between gas sensitivity and the structure of links between the TiO2 hollow hemispheres revealed the critical importance of tailoring links between individual oxide nanostructures for enhancing gas-sensing properties of the ensemble of the individual nanostructures. The facile and large-scale synthesis of embossed TiO2 films with nanolinked hollow hemispheres on Si substrates and the high sensitivity that is achieved without the aid of additives provide a sustainable competitive advantage over other methods for fabricating highly sensitive metal oxide gas sensors.

AB - Embossed TiO2 thin films with high surface areas were achieved using soft templates composed ofmonolayer polystyrene beads.The structure of links between beads in the templates could be controlled by varying O2 plasma etching time, resulting in a variety of templates with close-linked, nanolinked, or isolated beads. Room-temperature deposition of TiO2 on the plasma-treated templates and calcination at 550 °C resulted in embossed films with tailored links between anatase TiO2 hollow hemispheres. Although all embossed TiO2 films displayed a similar increase in the surface-to-volume ratio compared with a plain TiO2 thin film, the response of embossed TiO2 films with nanolinked hollow hemispheres to CO or ethanol gases was much higher than the response of films with close-linked or isolated hollow hemispheres. The strong correlation between gas sensitivity and the structure of links between the TiO2 hollow hemispheres revealed the critical importance of tailoring links between individual oxide nanostructures for enhancing gas-sensing properties of the ensemble of the individual nanostructures. The facile and large-scale synthesis of embossed TiO2 films with nanolinked hollow hemispheres on Si substrates and the high sensitivity that is achieved without the aid of additives provide a sustainable competitive advantage over other methods for fabricating highly sensitive metal oxide gas sensors.

UR - http://www.scopus.com/inward/record.url?scp=79959973016&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79959973016&partnerID=8YFLogxK

U2 - 10.1021/jp2020325

DO - 10.1021/jp2020325

M3 - Article

AN - SCOPUS:79959973016

VL - 115

SP - 9993

EP - 9999

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 20

ER -