Atomic layer deposition of titanium dioxide on multi-walled carbon nanotubes for ammonia gas sensing

Kaushik, Preeti; Eliáš, Marek; Michalička, Jan; Hegemann, Dirk; Pytlíček, Zdeněk; Nečas, David; Zajı́čková, Lenka

doi:10.1016/j.surfcoat.2019.04.031

Cited by 29 publications

(13 citation statements)

References 41 publications

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“…The creation of various composites based on MWCNTs, a matrix of conducting polymers (e.g., poly(3,4-ethylenedioxythiophene)–polystyrene sulfonic acid [ 134 ], polyaniline [ 135 , 136 ], polythiothene [ 137 ], etc. ), and metal oxides (TiO 2 [ 138 ], Al 2 O 3 [ 139 ]) made it possible to significantly improve the sensing behavior toward ammonia. Moreover, there are some hybrids used [ 140 ] where two types of carbon nanomaterials are applied, such as MWCNTs and reduced graphene oxide (rGO).…”

Section: Gas Sensors Based On Carbon Nanotubesmentioning

confidence: 99%

“…The creation of hybrids based on MWCNTs and metal oxide semiconductors makes it possible to enhance the sensitivity of gas sensors compared to pristine MWCNTs. In [ 138 ], catalytically grown MWCNTs were modified with TiO 2 using atomic layer deposition, whereas the interface between carbon nanotubes and titanium dioxide was functionalized by carboxyl plasma polymers. The formation of a p–n heterojunction made it possible to achieve a response of ≈2.5% toward 100 ppm NH 3 , which depended on the operating temperature of the sensor and increased from 25 to 100–150 °C.…”

Section: Gas Sensors Based On Carbon Nanotubesmentioning

confidence: 99%

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Recent Advances in Ammonia Gas Sensors Based on Carbon Nanomaterials

et al. 2021

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This review paper is devoted to an extended analysis of ammonia gas sensors based on carbon nanomaterials. It provides a detailed comparison of various types of active materials used for the detection of ammonia, e.g., carbon nanotubes, carbon nanofibers, graphene, graphene oxide, and related materials. Different parameters that can affect the performance of chemiresistive gas sensors are discussed. The paper also gives a comparison of the sensing characteristics (response, response time, recovery time, operating temperature) of gas sensors based on carbon nanomaterials. The results of our tests on ammonia gas sensors using various techniques are analyzed. The problems related to the recovery of sensors using various approaches are also considered. Finally, the impact of relative humidity on the sensing behavior of carbon nanomaterials of various different natures was estimated.

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Section: Gas Sensors Based On Carbon Nanotubesmentioning

confidence: 99%

Section: Gas Sensors Based On Carbon Nanotubesmentioning

confidence: 99%

Recent Advances in Ammonia Gas Sensors Based on Carbon Nanomaterials

et al. 2021

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“…Nanocomposites of TiO 2 and carbon nanotubes (CNTs), such as TiO 2 /CNTs heterostructures, have attracted great interest owing to their unique structures and outstanding properties. [ 1 ] As a wide bandgap semiconductor (3.2 eV for anatase), TiO 2 has been widely studied in solar cells, gas sensors, and energy storage and conversion due to its good chemical stability, excellent optoelectronic properties, low cost, and environmental friendliness. [ 2 ] Meanwhile, CNTs are 1D nanostructures with interesting features such as large surface area and high electrical and thermal conductivities.…”

Section: Introductionmentioning

confidence: 99%

Impact of Different Intermediate Layers on the Morphology and Crystallinity of TiO₂ Grown on Carbon Nanotubes by Atomic Layer Deposition

Wang

Yin

Hermerschmidt

et al. 2021

Adv Materials Inter

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Nanocomposites of TiO2 and carbon nanotubes (CNTs) have been extensively studied in photocatalysis, sensing, and energy conversion and storage over the last decade. The unique properties of these nanocomposites are greatly dependent on the morphology, crystallinity, and homogeneity of the TiO2 coating. However, a fine control of the film microstructure is still challenging due to limited understanding of early stages of the TiO2 growth. The presence of an intermediate buffer layer can induce remarkable changes in the morphological and structural characteristics of the coatings. Here, TiO2 films deposited by atomic layer deposition (ALD) on CNTs without and with different intermediate layers (Al2O3 and ZnO) have been systematically investigated. Compared to bare CNTs, it is suggested that these two intermediate layers with higher surface energy can lead to a delay of the TiO2 crystallization, ultimately resulting in the growth of conformal and crystalline TiO2 films. This study demonstrates a strategy to tailor the microstructure and the properties of thin films via ALD by applying intermediate layers and provides information about the role of surface energy of the substrate in crystallization and growth behavior of ALD thin films.

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“…In addition, CNTs can be used as active material for gas sensors [7][8][9]. Recently, the research on room temperature gas sensors based on CNTs for ammonia detection is of particular interest [10][11][12]. However, the response of gas sensors based on untreated CNTs is low enough.…”

Section: Introductionmentioning

confidence: 99%

“…However, the response of gas sensors based on untreated CNTs is low enough. Therefore, there are several approaches to enhance the sensing properties, such as the use of conducting polymers [13], plasma treatment [14,15], deposition of metallic [16] and oxide [10,17] nanoparticles. Plasma functionalization makes it possible to significantly improve capturing of ammonia molecules on the surface of carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Plasma functionalization of multi-walled carbon nanotubes for ammonia gas sensors

Bannov

Manakhov

2020

Proceedings of 7th International Electronic Conference on Sensors and Applications

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The role of plasma functionalization of multi-walled carbon nanotubes (MWCNTs) for room temperature ammonia gas sensors was investigated. Plasma functionalization of MWCNTs with maleic anhydride was carried out with various durations. Active material of gas sensor was investigated by scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. It has been shown that formation of functional groups on the surface of carbon nanotubes led to the increase in ammonia sensor response by 2-4 times. The increase of functionalization duration induces the rise of O:C from 0.28 to 0.335, increase of sensor resistance, and the distortion of shape of I-V curves.

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Atomic layer deposition of titanium dioxide on multi-walled carbon nanotubes for ammonia gas sensing

Cited by 29 publications

References 41 publications

Recent Advances in Ammonia Gas Sensors Based on Carbon Nanomaterials

Recent Advances in Ammonia Gas Sensors Based on Carbon Nanomaterials

Impact of Different Intermediate Layers on the Morphology and Crystallinity of TiO₂ Grown on Carbon Nanotubes by Atomic Layer Deposition

Plasma functionalization of multi-walled carbon nanotubes for ammonia gas sensors

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Atomic layer deposition of titanium dioxide on multi-walled carbon nanotubes for ammonia gas sensing

Cited by 29 publications

References 41 publications

Recent Advances in Ammonia Gas Sensors Based on Carbon Nanomaterials

Recent Advances in Ammonia Gas Sensors Based on Carbon Nanomaterials

Impact of Different Intermediate Layers on the Morphology and Crystallinity of TiO2 Grown on Carbon Nanotubes by Atomic Layer Deposition

Plasma functionalization of multi-walled carbon nanotubes for ammonia gas sensors

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Impact of Different Intermediate Layers on the Morphology and Crystallinity of TiO₂ Grown on Carbon Nanotubes by Atomic Layer Deposition