Highly stable low temperature alcohol sensor based on hydrothermally grown tetragonal titania nanorods

Bhowmik, Basanta; Bhattacharyya, P.

doi:10.1039/c5ra14518j

Cited by 33 publications

(27 citation statements)

References 24 publications

(97 reference statements)

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“…In contradiction with our observations, Moon et al presented that H 2 sensing of mesoporous titania was not effected by humidity variations (5%, 15%, 42%RH) at 140 • C [52]. Similarly, hydrothermally grown TiO 2 nanorods did not change the response values towards 1-100 ppm VOCs (ethanol, methanol, and propanol) at 75 • C under humidity variations (8%, 52%, 75%RH) [53]. The most probable reason for both of these cases is that the working temperatures were too low to initialize a strong chemisorption of water molecules on the surface of TiO 2 .…”

Section: Gas Sensingcontrasting

confidence: 99%

“…These are indicated in parentheses next to their response values in the table. Our rutile nanoporous titania sensor had better response values towards H 2 and C 2 H 6 O than similar nanoporous TiO 2 sensors [38,52,59], as well as most other nanostructures [53,[60][61][62]. Sensor response towards 25 ppm of C 2 H 3 N was 0.53 at 600 • C, which is an appropriate response value (≥0.1) to be used as an early detection system for acetonitrile exposure.…”

Section: Gas Sensingmentioning

confidence: 75%

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Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

et al. 2019

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The chemical routes of metal oxidation in presence of hydrogen peroxide solutions are tailor-made for the synthesis of biocompatible metal oxide surfaces with clean intermediate and end products, such as oxides, hydroxides, hydrogen and water. The hydrolysis of titanium in hydrogen peroxide solutions is particularly interesting for medical applications, forming micro- and nanoscale titania surfaces. In this paper, the content of the hydrolysis solution is revised, allowing the fabrication of gas sensor devices based on nanoporous titania. Nanopore and microcrack formations were discussed in detail by monitoring the structural changes on the thin film surface with field-emission scanning electron microscopy (FE-SEM). A stable rutile crystalline phase was detected by glancing incidence X-ray diffraction (GI-XRD) measurement after repetitive hydrothermal processes. Electrical conductance measurements were carried out at high temperatures (400–600 °C) under humid airflow (40% RH@20 °C) with the injection of various concentrations of a wide set of test compounds (C2H3N, CO, H2, NO2, C2H6O), to observe the sensing capabilities of the material. Furthermore, the humidity effects on the sensing properties toward H2, CO, and C2H6O have been discussed.

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Section: Gas Sensingcontrasting

confidence: 99%

Section: Gas Sensingmentioning

confidence: 75%

Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

et al. 2019

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“…Thus, this justifies the behavior we noticed in our TNW-based sensor. Several studies , have also observed the same behavior using TiO 2 -based sensors. Furthermore, in Figure S9, the shorter response and recovery times observed for the TNW sensor tested in C 7 H 8 vapor in the presence of RH in comparison to that in dry air clearly prove the existence of a catalytic influence for our sensor.…”

Section: Resultssupporting

confidence: 58%

TiO₂ Nanowires for Humidity-Stable Gas Sensors for Toluene and Xylene

Tshabalala

Mokoena

Jozela

et al. 2020

ACS Appl. Nano Mater.

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The dual-functionality sensor derived from semiconductor metal oxides operating at low temperature for low power consumption and robust stability toward humidity is a striking platform for economic and indoor air-quality monitoring. Therefore, in this work, temperature-dependent selectivity and robust stability toward carbon monoxide (CO), toluene (C7H8), and p-xylene (C8H10) are displayed by various TiO2 nanostructures synthesized following a facile hydrothermal method. The X-ray diffraction patterns confirmed the tetragonal structure of anatase TiO2. Surface studies confirmed the different morphologies, such as nanoparticles (TiO2 nanoparticles (TNPs)), nanowires (TiO2 nanowires (TNWs)), and sea-urchin-like hierarchically (HHC) arranged TiO2 nanostructures. Relatively high surface area and interconnected pore distribution were witnessed for TNWs and HHC nanostructures as compared to TNPs. In situ photoluminescence and X-ray photoelectron spectroscopy analyses confirmed the defect states of the nanostructures, and the TNWs possessed the highest concentration of oxygen vacancies and Ti3+, which influenced the dual-selectivity functionality of TNW toward C7H8 and C8H10 at 25 and 125 °C, respectively. Additionally, at an optimum working temperature of 25 °C, a response of 2.46 toward 20 ppm CO was witnessed for the HHC-based sensor and was attributed to the available surface area and active sites presented by the hierarchically arranged nanostructures. Cross-sensitivity measurements were conducted in the presence of interfering gases, which showed negligible cross-responses. The long-term stability in the presence of relative humidity and the sensing mechanism underlying the fascinating dual functionality for C7H8 and C8H10 vapor detection were discussed in detail. These findings showed that the current sensors can be employed for detection of C7H8 and C8H10 in a vastly robust and selective way with insignificant interference from ambient humidity.

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“…nanosheets and three-dimensional (3D) e.g. nanoflower for different applications [11,13]. The nanoparticles (OD) have attracted the great attention of researchers in the gas sensing fields.…”

Section: Introductionmentioning

confidence: 99%

A highly stable room temperature titania nanostructure-based thin film transistor (TFT) alcohol sensor

Singh

Bhowmik

2023

Sens. Diagn.

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Highly stable low temperature alcohol sensor based on hydrothermally grown tetragonal titania nanorods

Abstract: Highly stable, low temperature (27–175 °C) alcohol (ethanol, methanol and 2-propanol) sensing performance of a hydrothermally grown tetragonal TiO2nanorod array, targeting the detection level of 1–100 ppm, is reported in this paper.

Cited by 33 publications

References 24 publications

Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

TiO₂ Nanowires for Humidity-Stable Gas Sensors for Toluene and Xylene

A highly stable room temperature titania nanostructure-based thin film transistor (TFT) alcohol sensor

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Highly stable low temperature alcohol sensor based on hydrothermally grown tetragonal titania nanorods

Abstract: Highly stable, low temperature (27–175 °C) alcohol (ethanol, methanol and 2-propanol) sensing performance of a hydrothermally grown tetragonal TiO2nanorod array, targeting the detection level of 1–100 ppm, is reported in this paper.

Cited by 33 publications

References 24 publications

Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

TiO2 Nanowires for Humidity-Stable Gas Sensors for Toluene and Xylene

A highly stable room temperature titania nanostructure-based thin film transistor (TFT) alcohol sensor

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Product

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TiO₂ Nanowires for Humidity-Stable Gas Sensors for Toluene and Xylene