Low temperature acetone detection by p-type nano-titania thin film: Equivalent circuit model and sensing mechanism

Bhowmik, Basanta; Dutta, K.; Hazra, Arnab; Bhattacharyya, P.

doi:10.1016/j.sse.2014.04.023

Cited by 56 publications

(28 citation statements)

References 28 publications

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“…During experiment, high-purity synthetic air cylinder was used as the source of carrier gas and diluents and corresponding flow rate was controlled by a pair of mass flow controllers (MKS, USA). Desired concentration level of the ethanol was [8].…”

Section: Methodsmentioning

confidence: 99%

Tailoring of the Gas Sensing Performance of TiO<sub>2</sub> Nanotubes by 1-D Vertical Electron Transport Technique

Hazra

Bhattacharyya

2014

IEEE Trans. Electron Devices

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Aligned TiO 2 nanotubes (NTs), having diameter of 75 ± 10 nm and length of 280 ± 20 nm were synthesized by electrochemical anodization technique. Two types of device configurations, viz., planar/lateral and metal-insulator-metal (MIM)/vertical sensor structures were fabricated with TiO 2 NTs as the sensing layer. Vertical 1-D electron transport technique of MIM configurations was found to be very effective over the random (across the connected tubes) electron transport kinetics of planar devices, in determining the vapor (ethanol) sensor characteristics like response time and operating temperature. The optimum operating temperature of ethanol sensing was found to be much lower (75°C) in case of MIM compared with its planar counterpart (150°C). In addition, MIM configuration offered four and six times faster response and recovery times, respectively, compared with the planar ones toward 100-ppm ethanol at 75°C. Sensing performance of the device configuration was correlated with the corresponding grain boundary model and carrier transport time with the help of 1-D electron transport path constituted of TiO 2 NT array.Index Terms-Ethanol sensor, fast response, low temperature, metal-insulator-metal (MIM) configuration, planar configuration, TiO 2 nanotubes (NTs), vertical electron transport.

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Section: Methodsmentioning

confidence: 99%

Tailoring of the Gas Sensing Performance of TiO<sub>2</sub> Nanotubes by 1-D Vertical Electron Transport Technique

Hazra

Bhattacharyya

2014

IEEE Trans. Electron Devices

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“…The room temperature sensing behavior of cobalt oxide depends on the surface adsorption and desorption of C 3 H 6 O molecules on the available adsorption sites. 44 In the ambient environment, the gaseous oxygen molecules get chemisorbed on the p-type Co 3 O 4 surface by liberating the holes within the Debye length as expressed in eqn (12). As a result, Co 3 O 4 surface gets enriched with majority carriers (holes).…”

Section: View Article Onlinementioning

confidence: 99%

Development of an acetone sensor using nanostructured Co₃O₄ thin films for exhaled breath analysis

et al. 2019

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“…Sensor response magnitude (RM) is defined as RM = ((R a − R g )/R a ) × 100, where R a is sensor resistance in air, R g resistance in presence of test vapor. The time required to reach 90% of the saturation response value is defined as response time and time required to fall 90% from the saturation value is defined as recovery time [8]. …”

Section: B Device Fabricationmentioning

confidence: 99%

Repeatability and Stability of Room-Temperature Acetone Sensor Based on <inline-formula> <tex-math notation="TeX">$\hbox{TiO}_{2}$</tex-math></inline-formula> Nanotubes: Influence of Stoichiometry Variation

Bhowmik

Hazra

Dutta

et al. 2014

IEEE Trans. Device Mater. Relib.

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The oxygen vacancy (OV) variation of the electrochemically grown TiO 2 nanotube (NT) was achieved through stoichiometry variation by varying the volume of water in the electrolyte (NH 4 F with ethylene glycol) during anodization. By varying the water content (0%, 2%, and 10% by volume) in the mixed electrolyte, the morphology and stoichiometry of NTs were found to be varied dramatically. After detailed structural and morphological characterization by X-ray diffraction and field--emission scanning electron microscope and photoluminescence spectroscopy, the room-temperature acetone sensing was investigated by employing three distinct nanoforms derived through anodization. The reliability (i.e., repeatability and stability) of the sensors, as well as their response magnitude, was found to be greatly influenced by the variation in stoichiometry. The NTs derived with 2 volume percent H 2 O was found to offer the most promising response magnitude with excellent repeatability, whereas the best stability was ensured in the case of the NTs derived with 10 volume percent H 2 O. It was observed that an optimization of stoichiometry (OVs) and the surface-to-volume ratio is important in determining the response magnitude and repeatability. On the contrary, the stability is mainly governed by the stoichiometry only.Index Terms-Electrochemical anodization, TiO 2 nanotubes (NTs), stoichiometry variation, Oxygen vacancies (OVs), room temperature acetone sensing, repeatability and stability.

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Low temperature acetone detection by p-type nano-titania thin film: Equivalent circuit model and sensing mechanism

Cited by 56 publications

References 28 publications

Tailoring of the Gas Sensing Performance of TiO<sub>2</sub> Nanotubes by 1-D Vertical Electron Transport Technique

Tailoring of the Gas Sensing Performance of TiO<sub>2</sub> Nanotubes by 1-D Vertical Electron Transport Technique

Development of an acetone sensor using nanostructured Co₃O₄ thin films for exhaled breath analysis

Repeatability and Stability of Room-Temperature Acetone Sensor Based on <inline-formula> <tex-math notation="TeX">$\hbox{TiO}_{2}$</tex-math></inline-formula> Nanotubes: Influence of Stoichiometry Variation

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Low temperature acetone detection by p-type nano-titania thin film: Equivalent circuit model and sensing mechanism

Cited by 56 publications

References 28 publications

Tailoring of the Gas Sensing Performance of TiO<sub>2</sub> Nanotubes by 1-D Vertical Electron Transport Technique

Tailoring of the Gas Sensing Performance of TiO<sub>2</sub> Nanotubes by 1-D Vertical Electron Transport Technique

Development of an acetone sensor using nanostructured Co3O4 thin films for exhaled breath analysis

Repeatability and Stability of Room-Temperature Acetone Sensor Based on <inline-formula> <tex-math notation="TeX">$\hbox{TiO}_{2}$</tex-math></inline-formula> Nanotubes: Influence of Stoichiometry Variation

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Development of an acetone sensor using nanostructured Co₃O₄ thin films for exhaled breath analysis