Au/TiO<sub>2</sub> Nanotubes/Ti-Based Solid-State Vapor Sensor: Efficient Sensing in Resistive and Capacitive Modes

Bindra, Prateek; Gangopadhyay, S.; Hazra, Arnab

doi:10.1109/ted.2018.2809677

Cited by 27 publications

(8 citation statements)

References 26 publications

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“…The O1s spectra of pure TiO 2 nanoparticle (S 2 ) showed a high and low binding energy peak at 532.7 eV and 529.9 eV respectively (figure 3(d)). The high binding energy peak (532.7 eV) corresponds to the organic impurities and adsorbed surface oxygen groups [55]. The low binding energy peak (529.9 eV) corresponds to the lattice oxygen.…”

Section: Formation Of Functionalized C 60 -Encapsulated Tio 2 Nanopar...mentioning

confidence: 99%

C₆₀-encapsulated TiO₂ nanoparticles for selective and ultrahigh sensitive detection of formaldehyde

Gakhar¹,

Hazra²

2021

Nanotechnology

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The current study concerns development of fullerene-C 60 -encapsulated TiO 2 nanoparticles hybrid for an efficient detection of volatile organic compounds (VOCs). The nanocomposite was synthesized via chemical route by using hydrated fullerene-C 60 and sol-gel derived undoped ptype TiO 2 nanoparticles. The nanocomposite was characterized morphologically and structurally comparing with pure C 60 clusters and pure TiO 2 nanoparticles as the reference materials. The average diameter of the C 60 -encapsulated TiO 2 nanoparticles was 150 nm whereas the average diameters of C 60 clusters and pure TiO 2 nanoparticles were 161 nm and 18 nm respectively. Therefore, all the materials were implemented in interdigitated electrode based planner structured sensors and tested towards multiple VOCs. However, C 60 -TiO 2 composite exhibited its natural selectivity towards formaldehyde with a very high sensitivity for the concentration range of 1-1000 ppm. C 60 -encapsulated TiO 2 nanoparticles depicted more than double response magnitude (117%) than the pure TiO 2 nanoparticle (48%) and pure C 60 particles (40%) and appreciably fast response/recovery (12 s/331 s) towards 100 ppm of formaldehyde at 150 °C. However, the efficient VOC sensing was achieved in C 60 -encapsulated TiO 2 sensors possibly due to the extreme reactive surface provided by the oxygen functionalized C 60 and easy electronic exchange between ambient and the TiO 2 nanoparticles through C 60 layers. The combined properties of both C 60 and TiO 2 lead to the formation of a promising nanocomposite which provided better sensing characteristics than that of the pure materials.

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Section: Formation Of Functionalized C 60 -Encapsulated Tio 2 Nanopar...mentioning

confidence: 99%

C₆₀-encapsulated TiO₂ nanoparticles for selective and ultrahigh sensitive detection of formaldehyde

Gakhar¹,

Hazra²

2021

Nanotechnology

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“…The sensor containing 1 mol% Auembedded TiO 2 hollow nanospheres prepared under ultraviolet (UV) irradiation responded to 5 ppm formaldehyde at RT, providing a response of 8.5. Bindra et al 113 synthesized highly ordered TiO 2 nanotube arrays using electrochemical anodic oxidation technique, and prepared Au/TiO 2 nanotube/ Ti-based solid-state vapor sensors by functionalization of Au, including resistance mode and capacitance mode. When exposed to 1000 ppm ethanol, the resistance of the sensor decreased, but the capacitance increased by 28 789.95%.…”

Section: Perspectivementioning

confidence: 99%

The enhanced sensing properties of MOS-based resistive gas sensors by Au functionalization: a review

Luan,

Hu,

et al. 2023

Dalton Trans.

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“…The surface structure properties play a key role in electrocatalytic performance [18]. Some research efforts to further increase the surface area of anodic TiO 2 nanotubes have been found, such as fabrication of multilayer TiO 2 nanotube arrays with extra porous interlayers [19][20][21]. The TiO 2 tubular structure evolves from single layer to a double-layer structure of nanotubes under two-step anodization at high voltage.…”

Section: Morphological and Crystalline Phase Characterizationmentioning

confidence: 99%

Double layer lanthanide –Pt/TiO₂ nanotube arrays electrode as a cost-highly efficient electrocatalyst for hydrogen evolution in acid media

Emran

Alanazi

2021

Journal of Experimental Nanoscience

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Self-organized anodic double layer TiO 2 nanotube arrays (TNTAs) were sensitized by an electrochemical anodization process on a Ti sheet with a two-step anodization method. The prepared sample, followed by hydrothermal treatment with Nd(NO 3 ) 3 and/or Gd(NO 3 ) 3 and/or PtCl 4 solution at 180 C for 2 h, produced Nd-Pt-TNTAs, Gd-Pt-TNTAs, Nd-Gd-Pt-TNTAs and Pt-TNTAs. The morphological and structural properties were studied by SEM, XRD and Raman spectra techniques. The hydrogen evolution reaction (HER) performance on Lanthanides-Pt-TNTAs was investigated using the Tafel linear polarization technique. The calculated values of the activation energy are in good agreement with the trend in catalytic activity. The excellent performance of doped TNTAs with low activation energy (E a ) is due to the formation of an excitation energy level below the conduction band of TiO 2 from the binding of electrons with oxygen vacancies decreasing the excitation energy resulting in robust electrocatalytic activity. The very low value of E a for Nd-Gd-Pt-TNTAs (2.02 kJ/mol) compared to other electrochemical catalysts used for hydrogen evolution reactions containing titanium nanotubes was achieved for the first time. This makes the Lanthanides -Pt-TNTAs prepared in the present work optimal catalysts for electrodes and promising for applications in fuel cells or as water splitting materials. HIGHLIGHTSSynthesis of self-organized anodic double layer TiO 2 nanotube arrays (TNTAs) on a Ti sheet with a two-step anodization method. Nd, Gd, Pt were deposited on anodic TNTAs arrays by hydrothermal method. The HER mechanisms on Lanthanides-Pt-TNTAs in acidic media has been discussed. The order of catalytic activity based on the values of activation energy was Nd-Gd-Pt-TNTAs > Gd-Pt-TNTAs > Nd-Pt-TNTAs > Pt-TNTAs > undoped TNTAs.

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Au/TiO₂ Nanotubes/Ti-Based Solid-State Vapor Sensor: Efficient Sensing in Resistive and Capacitive Modes

Cited by 27 publications

References 26 publications

C₆₀-encapsulated TiO₂ nanoparticles for selective and ultrahigh sensitive detection of formaldehyde

C₆₀-encapsulated TiO₂ nanoparticles for selective and ultrahigh sensitive detection of formaldehyde

The enhanced sensing properties of MOS-based resistive gas sensors by Au functionalization: a review

Double layer lanthanide –Pt/TiO₂ nanotube arrays electrode as a cost-highly efficient electrocatalyst for hydrogen evolution in acid media

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Au/TiO2 Nanotubes/Ti-Based Solid-State Vapor Sensor: Efficient Sensing in Resistive and Capacitive Modes

Cited by 27 publications

References 26 publications

C60-encapsulated TiO2 nanoparticles for selective and ultrahigh sensitive detection of formaldehyde

C60-encapsulated TiO2 nanoparticles for selective and ultrahigh sensitive detection of formaldehyde

The enhanced sensing properties of MOS-based resistive gas sensors by Au functionalization: a review

Double layer lanthanide –Pt/TiO2 nanotube arrays electrode as a cost-highly efficient electrocatalyst for hydrogen evolution in acid media

Contact Info

Product

Resources

About

Au/TiO₂ Nanotubes/Ti-Based Solid-State Vapor Sensor: Efficient Sensing in Resistive and Capacitive Modes

C₆₀-encapsulated TiO₂ nanoparticles for selective and ultrahigh sensitive detection of formaldehyde

C₆₀-encapsulated TiO₂ nanoparticles for selective and ultrahigh sensitive detection of formaldehyde

Double layer lanthanide –Pt/TiO₂ nanotube arrays electrode as a cost-highly efficient electrocatalyst for hydrogen evolution in acid media