Mesoporous sieve structured ITO-based thin films for enhanced formaldehyde detection

Dasari, Sunil Gavaskar; Nagaraju, P.; Vijayakumar, Y.; Reddy, M.V. Ramana

doi:10.1007/s10854-022-09106-8

Cited by 7 publications

(4 citation statements)

References 75 publications

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“…The defect density variation with Nb codoping concentration is shown in Figure 7b, where NFTO4 shows the highest defect density in the order of 10 21 (per cm 3 ), a similar range of defect density was reported significantly in the literature. [54,[82][83][84][85] The defect density increases up to Nb 4 wt% (NFTO4 film), and it decreases for further increase in concentration, leading to a quenching effect. Moreover, the increasing free carrier absorption leads to quenching in luminescence properties.…”

Section: Optical Propertiesmentioning

confidence: 99%

Anionic Fluorine and Cationic Niobium Codoped Tin Oxide Thin Films as Transparent Conducting Electrodes for Optoelectronic Applications

Muniramaiah

Reddy

Santhosh

et al. 2023

Physica Status Solidi (a)

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Exploration of alternatives for supplementing indium tin oxide electrode is currently trending due to scarcity of indium, leading to a steep increase in the cost of related optoelectronic components. Codoping of niobium (Nb) and fluorine (F) into SnO2 lattice as cationic and anionic dopants, respectively, is explored by spray deposition technique. A fixed 10 wt% F and varying Nb concentration from 0 to 5 wt% is incorporated into the SnO2 lattice. X‐ray diffraction reveals substitution of Nb and F into the SnO2 lattice without altering the structure. Optical transmittance is found to increase with Nb content up to 4% of Nb (77.59%), and it decreases thereafter. Scanning electron microscope and optical profiler imply a relatively smooth surface with sharp‐tipped particles which vary with Nb concentration. Sheet resistance decreases up to 3 wt% of Nb doping and increases thereafter. Contact angle measurement indicates that upon doping with Nb, the films turn hydrophilic. Among the deposited films, 4 wt% of Nb‐doped film shows the highest figure of merit of 5.01 × 10−3 Ω−1. The surface work function of the 4 wt% Nb‐doped SnO2 film is 4,687.85 meV. The optimal films are tested as electrodes in dye‐sensitized solar cells and are discussed in detail.

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Section: Optical Propertiesmentioning

confidence: 99%

Anionic Fluorine and Cationic Niobium Codoped Tin Oxide Thin Films as Transparent Conducting Electrodes for Optoelectronic Applications

Muniramaiah

Reddy

Santhosh

et al. 2023

Physica Status Solidi (a)

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“…Ti-O-Mg bond formation through Mg doping is believed to hinder grain growth, resulting in smaller crystallites [27]. Other parameters, such as micro-strain, dislocation density, lattice parameters, lattice volume, and dspacing [38,39] were determined and tabulated in table 2.…”

Section: Impact Of Mg On Tio 2 Crystal Structural Propertiesmentioning

confidence: 99%

Synergistic effects of Mg doping on TiO₂ for improved toxic gas sensing performance at room temperature

Rajkumar,

Umamahesvari,

Nagaraju

2023

J. Phys.: Condens. Matter

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The gas sensing characteristics of magnesium (Mg)-doped titanium dioxide (TiO2) films were investigated using a spray pyrolysis method. Thin films with varying Mg doping concentrations (0, 2.5, and 5 weight percentages) were deposited and tested for their gas detection ability to organic compounds such as ethanol, butanol, toluene, xylene, and formaldehyde at room temperature (RT). Results disclosed that introducing Mg into TiO2 enhanced the gas sensing characteristics, particularly for formaldehyde. Mg doped TiO2 film enhanced the change in electrical resistance during gas adsorption, leading to an increased response in formaldehyde detection. Additionally, the structural, topographical, and optical characteristics of Mg-TiO2 films were examined. The findings suggest that Mg doping can significantly enhance the gas-sensing features of TiO2 films, making them promising candidates for gas-sensing applications.

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“…Therefore, a simple detection method with high sensitivity and specificity is desired for quick and accurate assessment of indoor formaldehyde. Analytical methods currently developed for formaldehyde mainly include gas/liquid chromatography, , spectrophotometry, fluorometry, − and sensors. − While these methods served their goals of detecting formaldehyde, a majority of those require long preparation time, unstable chemicals, or expensive equipment and sometimes lack specificity. Electrochemical sensors for formaldehyde detections, owing to their low cost and facile operations properties, have attracted much interest recently.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Selective Detection of Formaldehyde via Bio-Electrocatalysis over Aldehyde Dehydrogenase

Zhang

Song

et al. 2022

Anal. Chem.

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Formaldehyde (HCHO), as one of the prominent indoor pollutants, causes many health-related problems. Although the detection of HCHO is a widespread concern and a variety of detection methods have been continuously developed, the volatile organic chemical (VOC) interference remains to be solved. Here, we report a highly sensitive and selective method for HCHO detection, relying on the selective electrochemical oxidation of formaldehyde catalyzed by aldehyde dehydrogenases (ALDHs) on a Cu electrode. The detection signal exhibits a standard power law relationship against the analytes with a broad detection range of 10 −5 −10 −15 M and a limit of detection (LOD) of 1.46 × 10 −15 M, far below the indoor safe exposure limit (about 10 −9 M) for formaldehyde. In comparison to the standard spectrophotometry method, the ALDH-based electrochemical method shows a much high specificity to formaldehyde among common VOCs, such as benzene, toluene, and xylene. This simple yet effective detection technique opens up a new path for developing advanced formaldehyde sensors with high sensitivity and selectivity.

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Mesoporous sieve structured ITO-based thin films for enhanced formaldehyde detection

Cited by 7 publications

References 75 publications

Anionic Fluorine and Cationic Niobium Codoped Tin Oxide Thin Films as Transparent Conducting Electrodes for Optoelectronic Applications

Anionic Fluorine and Cationic Niobium Codoped Tin Oxide Thin Films as Transparent Conducting Electrodes for Optoelectronic Applications

Synergistic effects of Mg doping on TiO₂ for improved toxic gas sensing performance at room temperature

Highly Sensitive and Selective Detection of Formaldehyde via Bio-Electrocatalysis over Aldehyde Dehydrogenase

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Mesoporous sieve structured ITO-based thin films for enhanced formaldehyde detection

Cited by 7 publications

References 75 publications

Anionic Fluorine and Cationic Niobium Codoped Tin Oxide Thin Films as Transparent Conducting Electrodes for Optoelectronic Applications

Anionic Fluorine and Cationic Niobium Codoped Tin Oxide Thin Films as Transparent Conducting Electrodes for Optoelectronic Applications

Synergistic effects of Mg doping on TiO2 for improved toxic gas sensing performance at room temperature

Highly Sensitive and Selective Detection of Formaldehyde via Bio-Electrocatalysis over Aldehyde Dehydrogenase

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Synergistic effects of Mg doping on TiO₂ for improved toxic gas sensing performance at room temperature