Manipulating MWCNT/TiO2 heterostructure morphology at nanoscale
and its implications to NO2 sensing properties

J 2021

Manipulating MWCNT/TiO2 heterostructure morphology at nanoscale and its implications to NO2 sensing properties

KAUSHIK, Preeti, Marek ELIÁŠ, Jan PRASEK, Jiří MICHALIČKA, Lenka ZAJÍČKOVÁ et. al.

Basic information

Original name

Manipulating MWCNT/TiO2 heterostructure morphology at nanoscale and its implications to NO2 sensing properties

Authors

KAUSHIK, Preeti (356 India, belonging to the institution), Marek ELIÁŠ (203 Czech Republic), Jan PRASEK (203 Czech Republic), Jiří MICHALIČKA (203 Czech Republic) and Lenka ZAJÍČKOVÁ (203 Czech Republic, belonging to the institution)

Edition

Materials Chemistry and Physics, LAUSANNE, Elsevier, 2021, 0254-0584

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10302 Condensed matter physics

Country of publisher

Netherlands

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 4.778

RIV identification code

RIV/00216224:14310/21:00124112

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.matchemphys.2021.124901

UT WoS

000682405000004

Keywords in English

Multi-walled carbon nanotubes; Atomic layer deposition; Oxygen plasma treatment; HRTEM; Chemiresistive gas sensor

Abstract

V originále

Multi-walled carbon nanotubes (MWCNTs) based heterostructures were prepared by oxygen plasma treatment and atomic layer deposition (ALD) of TiO2 carried on MWCNTs. Different TiO2 structures (island, granular and continuous forms) on the nanotubes were obtained by varying the processing parameters. Chemical inertness of MWCNTs led to the ALD of TiO2 in an island form. Oxygen plasma treatment ensured deposition of a continuous TiO2 film, 5 nm in thickness. A granular form of TiO2 was obtained on oxygen plasma treated MWCNTs using shorter duration of Ti-precursor pulse. Different imaging modes in high resolution transmission electron microscopy visualized TiO2 nanostructures and defects in MWCNT walls. The latter were also confirmed by Raman spectroscopy. The morphology of TiO2 and oxygen plasma treatment of the MWCNTs highly affected the NO2 sensing behavior of chemiresistive heterostructure sensors at room and elevated temperatures. All investigated sensors exhibited a decrease in the resistance upon exposure to NO2 gas which implies a p-type sensor response. The granular TiO2/MWCNTs heterostructure showed the highest response towards NO2 gas as compared to the island and continuous forms.

Citovat

KAUSHIK, Preeti, Marek ELIÁŠ, Jan PRASEK, Jiří MICHALIČKA and Lenka ZAJÍČKOVÁ. Manipulating MWCNT/TiO2 heterostructure morphology at nanoscale and its implications to NO2 sensing properties. Materials Chemistry and Physics. LAUSANNE: Elsevier, 2021, vol. 271, October, p. 124901-124911. ISSN 0254-0584. Available from: https://dx.doi.org/10.1016/j.matchemphys.2021.124901.

@article{1833037,
   author = {Kaushik, Preeti and Eliáš, Marek and Prasek, Jan and Michalička, Jiří and Zajíčková, Lenka},
   article_location = {LAUSANNE},
   article_number = {October},
   doi = {http://dx.doi.org/10.1016/j.matchemphys.2021.124901},
   keywords = {Multi-walled carbon nanotubes; Atomic layer deposition; Oxygen plasma treatment; HRTEM; Chemiresistive gas sensor},
   language = {eng},
   issn = {0254-0584},
   journal = {Materials Chemistry and Physics},
   title = {Manipulating MWCNT/TiO2 heterostructure morphology at nanoscale and its implications to NO2 sensing properties},
   url = {https://www.sciencedirect.com/science/article/pii/S0254058421006842?via%3Dihub},
   volume = {271},
   year = {2021}
}

TY  - JOUR
ID  - 1833037
AU  - Kaushik, Preeti - Eliáš, Marek - Prasek, Jan - Michalička, Jiří - Zajíčková, Lenka
PY  - 2021
TI  - Manipulating MWCNT/TiO2 heterostructure morphology at nanoscale and its implications to NO2 sensing properties
JF  - Materials Chemistry and Physics
VL  - 271
IS  - October
SP  - 124901
EP  - 124901
PB  - Elsevier
SN  - 02540584
KW  - Multi-walled carbon nanotubes
KW  - Atomic layer deposition
KW  - Oxygen plasma treatment
KW  - HRTEM
KW  - Chemiresistive gas sensor
UR  - https://www.sciencedirect.com/science/article/pii/S0254058421006842?via%3Dihub
N2  - Multi-walled carbon nanotubes (MWCNTs) based heterostructures were prepared by oxygen plasma treatment and atomic layer deposition (ALD) of TiO2 carried on MWCNTs. Different TiO2 structures (island, granular and continuous forms) on the nanotubes were obtained by varying the processing parameters. Chemical inertness of MWCNTs led to the ALD of TiO2 in an island form. Oxygen plasma treatment ensured deposition of a continuous TiO2 film, 5 nm in thickness. A granular form of TiO2 was obtained on oxygen plasma treated MWCNTs using shorter duration of Ti-precursor pulse. Different imaging modes in high resolution transmission electron microscopy visualized TiO2 nanostructures and defects in MWCNT walls. The latter were also confirmed by Raman spectroscopy. The morphology of TiO2 and oxygen plasma treatment of the MWCNTs highly affected the NO2 sensing behavior of chemiresistive heterostructure sensors at room and elevated temperatures. All investigated sensors exhibited a decrease in the resistance upon exposure to NO2 gas which implies a p-type sensor response. The granular TiO2/MWCNTs heterostructure showed the highest response towards NO2 gas as compared to the island and continuous forms.
ER  -

KAUSHIK, Preeti, Marek ELIÁŠ, Jan PRASEK, Jiří MICHALIČKA and Lenka ZAJÍČKOVÁ. Manipulating MWCNT/TiO2 heterostructure morphology at nanoscale and its implications to NO2 sensing properties. \textit{Materials Chemistry and Physics}. LAUSANNE: Elsevier, 2021, vol.~271, October, p.~124901-124911. ISSN~0254-0584. Available from: https://dx.doi.org/10.1016/j.matchemphys.2021.124901.

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