Sensor response of sol–gel multiwalled carbon nanotubes-TiO2 composites deposited by screen-printing and dip-coating techniques

Sánchez, Marco A.; Rincón, Marina E.

doi:10.1016/j.snb.2009.04.006

Cited by 65 publications

(33 citation statements)

References 25 publications

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“…During the sol-gel process, titania nucleation and growth, via a hydrolysis mechanism, will occur on the surface acid sites located along the sidewalls of the CNTs. 22,27,29,30 With the sol-gel method the CNTs were subjected to an ultrasound treatment before and right after mixing with the titania precursor. Thus,some of the nanotubes were detached from the CNT bundles and as a result there were a greater number of nucleation sites for the growth of titania deposits which can account for the slightly fewer titania agglomerates observed with the sol-gel method.…”

Section: Sem Investigationsmentioning

confidence: 99%

“…Use of MWCNTs in DSSCs is an active area of research, and early work in this field used MWCNTs in DSSCs as either a counter electrode, 25 an additive, 26 or as a nanocomposite material. [27][28][29] MWCNT-titania nanocomposites have been fabricated by a number of ways such as sol-gel, 30 mechanical mixing, 10 electro-spinning, 14,23 electrophoresis deposition, 31 novel surfactant solgel wrapping, 18 blending, 13 physical vapour deposition, sputtering deposition, 16 supercritical fluid deposition, 19 capillary action, hydrothermal 32 and chemical vapour deposition (CVD). 33 MWCNTs agglomerate easily and extra care must be taken to ensure that the nanotubes disperse homogeneously within a matrix of interest.…”

Section: Introductionmentioning

confidence: 99%

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Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Mombeshora¹,

Simoyi²,

Nyamori³

et al. 2015

S.Afr.j.chem

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Nanocomposites consisting of multiwalled carbon nanotubes and titania were synthesized by two methods, namely, sol-gel and chemical vapour deposition (CVD) methods. The work takes advantage of the bridging ability of nanotechnology between macromolecules and the solid state process in engineering alternative nanomaterials for various applications including solar cell fabrication. Physical and chemical characterization of the mesoporous nanocomposites from the two synthetic methods were investigated using Raman spectroscopy, thermogravimetric analysis, Fourier transformation infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, surface characterization and X-ray diffraction analysis. Physicochemical properties in the nanocomposites such as thermal stability, pore volume, crystallinity and surface area were observed to be a subject of MWCNT: titania ratios and synthetic methods. From the CVD synthetic method, observed attributes include more uniform and smoother coating; better crystallinity and larger pore width than sol-gel method. On the other hand, nanocomposites from sol-gel synthetic method had larger surface areas, were more defective and less thermally stable than those from CVD. Nanocomposites by the CVD method performed 39.2 % more efficient than those from sol-gel in light-harvesting experiments. The study shows that the nanocomposites synthesized were more effective than titania alone when the cheaper natural dye, Eosin B, was used. This highlights the great potential of typical nanomaterials in improving the performances of titania in DSSCs as well as lowering the cost of the ultimate devices.

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Section: Sem Investigationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Mombeshora¹,

Simoyi²,

Nyamori³

et al. 2015

S.Afr.j.chem

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“…Therefore the human activity is a main reason for the presence of larger amount of ammonia in our atmosphere and is a necessity to detect its presence. Hence much research has been focused on the development of suitable gas sensitive materials to detect lower concentration of NH 3 with excellent performance [3].There are several studies concerning metal oxides like SnO 2 , WO 3 , ZnO, TiO 2 for NH 3 sensing applications but generally it requires a high working temperature [4,5]. There are also several conducting polymers like polythiophene, polypyrrole and polyaniline are used for detecting gases, however, the poor selectivity is the main disadvantages of pure inorganic and organic materials.…”

mentioning

confidence: 99%

“…There are several studies concerning metal oxides like SnO 2 , WO 3 , ZnO, TiO 2 for NH 3 sensing applications but generally it requires a high working temperature [4,5]. There are also several conducting polymers like polythiophene, polypyrrole and polyaniline are used for detecting gases, however, the poor selectivity is the main disadvantages of pure inorganic and organic materials.…”

mentioning

confidence: 99%

Preparation and Characterization of Polyaniline/ZnO Composite Sensor

Mehto

Chauhan

et al. 2017

JNMR

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Polyaniline/ZnO nanocomposite thin films were prepared via an electrochemical synthesis route on ITO coated glass substrates. ZnO nanoparticles were uniformly dispersed in to the polyaniline matrix. Interaction between ZnO nanoparticle and polyaniline has been studied using X-ray diffraction (XRD), UV-Vis absorption spectroscopy, PL spectroscopy, AFM and I-V characteristics. The ammonia gas sensing behaviors of the polyaniline/ZnO composites were examined at room temperature. It was observed that the composite films showed good sensitivity, improved doping state and enhanced photoluminescence behaviour.Keywords: Polyaniline; ITO; AFM; UV-Vis absorption spectroscopy; Nanocomposites Ammonia plays very crucial role for human health. The way of natural process in animals, human and plants are responsible for production of ammonia in atmosphere. High concentrations of ammonia can cause difficulty in breathing, irritation to the eyes and skin and long term exposure of NH 3 leads to fatal [1]. There is a variety of applications of artificially synthesized ammonia in chemical industry, fertilizer factories, textile, food processing, bleaching products and refrigeration systems [2]. Therefore the human activity is a main reason for the presence of larger amount of ammonia in our atmosphere and is a necessity to detect its presence. Hence much research has been focused on the development of suitable gas sensitive materials to detect lower concentration of NH 3 with excellent performance [3].There are several studies concerning metal oxides like SnO 2 , WO 3 , ZnO, TiO 2 for NH 3 sensing applications but generally it requires a high working temperature [4,5]. There are also several conducting polymers like polythiophene, polypyrrole and polyaniline are used for detecting gases, however, the poor selectivity is the main disadvantages of pure inorganic and organic materials. New and interesting properties can be achieved by combining organic and inorganic materials [6]. Therefore conducting polymer/inorganic nanocomposites are explored as promising materials for sensing application, because of their good ability and compatibility to form chemical sensors with higher sensitivity at room temperature.Among the conducting polymers polyaniline based nanocomposites have many advantages. In literature, there are some reports available concerning the synthesis of polyaniline/ metal oxide nanocomposites in gas sensing applications. Huyen et al. [7] synthesize polyaniline/TiO 2 nanocomposites and studies the effect of TiO 2 on the sensing features. Lee et al. [8] described the effects of O 2 plasma treatment on NH3 sensing characteristics of multiwall carbon nanotube/polyaniline composite films. Wu et al. [9] reported the characterization and gas sensitivity study of polyaniline/SnO 2 hybrid material prepared by hydrothermal route. Deshpande et al. [10] reported tin oxide-intercalated polyaniline nanocomposite for ammonia gas sensing applications.We employed simple electrochemical technique to synthesize polyaniline/ZnO nanoco...

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“…Even though crystalline titanium oxide phases are mostly studied, few papers demonstrated good sensing properties of amorphous TiO 2 nanotubes towards oxygen at low/moderate temperature [18]. TiO 2 /CNT hybrid composites have been already investigated as gas sensors [19][20][21][22][23][24][25][26]. Early attempts focused on dispersion of CNTs into titania films [19,21,22].…”

mentioning

confidence: 99%

Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes

et al. 2014

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Abstract:Amorphous titanium dioxide-coated carbon nanotubes were prepared by atomic layer deposition and investigated as sensing layers for resistive NO2 and O2 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 °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. CONFIDENTIAL -FOR REVIEW ONLY NANO-104240.R2Gas sensing properties and p-type response of ALD TiO 2 coated carbon nanotubes Email: catherine.marichy@univ-lyon1.fr AbstractAmorphous titanium dioxide-coated carbon nanotubes were prepared by atomic layer deposition and investigated as sensing layers for resistive NO 2 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 °C, while CNTs decorated with either discontinuous film or TiO 2 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 TiO 2 /CNT sensors.

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Sensor response of sol–gel multiwalled carbon nanotubes-TiO2 composites deposited by screen-printing and dip-coating techniques

Cited by 65 publications

References 25 publications

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Preparation and Characterization of Polyaniline/ZnO Composite Sensor

Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes

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Sensor response of sol–gel multiwalled carbon nanotubes-TiO2 composites deposited by screen-printing and dip-coating techniques

Cited by 65 publications

References 25 publications

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

Preparation and Characterization of Polyaniline/ZnO Composite Sensor

Gas sensing properties and p-type response of ALD TiO2coated carbon nanotubes

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Product

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Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes