Gas sensing properties and p-type response of ALD TiO2 coated carbon nanotubes

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abstract

Amorphous titanium dioxide-coated carbon nanotubes (CNTs) were prepared by atomic layer deposition (ALD) and investigated as sensing layers for resistive NO2 and O-2 gas sensors. By varying ALD process conditions and CNT structure, heterostructures with different metal oxide grain size, morphology and coating thickness were synthesized. Higher responses were observed with homogeneous and continuous 5.5 nm thick films onto CNTs at an operating temperature of 150 degrees C, while CNTs decorated with either discontinuous film or TiO2 nanoparticles showed a weak response close to the one of device made of bare CNTs. An unexpected p-type behavior in presence of the target gas was also noticed, independently of the metal oxide morphology and thickness. Based on previous works, hypotheses were made in order to explain the p-type behavior of TiO2/CNT sensors.

keywords

ATOMIC LAYER DEPOSITION; METAL-OXIDES; ROOM-TEMPERATURE; THIN-FILMS; SENSORS; COMPOSITES; SNO2; NANOSTRUCTURES; NANOFIBERS; GRAPHENE

subject category

Science & Technology - Other Topics; Materials Science; Physics

authors

Marichy, C; Donato, N; Latino, M; Willinger, MG; Tessonnier, JP; Neri, G; Pinna, N

our authors

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Catherine Marthe Dominique Marichy

Post-Doc Fellowship

Groups

Projects

Nanotubes and Nanowires based hybrid nanostructures (PTDC/CTM/098361/2008)

Structural and chemical characterization at the nanometer scale (PTDC/CTM/100468/2008)

RMNE-UA-National Network of Electron Microscopy (REDE/1509/RME/2005 )

acknowledgements

This work was partially supported by the FCT projects (PTDC/CTM/098361/2008), (PTDC/CTM/100468/2008), and (REDE/1509/RME/2005) and the FCT grant (SFRH/BD/71453/2010).

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Publication Details

type
Journal Article
year
2015
journal
NANOTECHNOLOGY
volume
26
article number
24004
publisher
IOP PUBLISHING LTD
issn
0957-4484
issue
2
digital object identifier
10.1088/0957-4484/26/2/024004
web of science article identifier
WOS:000346999500005

Journal Metrics (JCR 2019)

Journal Impact Factor
3.551
Journal Impact Factor (5 yrs)
3.392
category normalized journal percentile
63.589

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