Ammonia room-temperature gas sensor using different TiO2 nanostructures

Shooshtari, Mostafa; Salehi, Alireza

doi:10.1007/s10854-021-06269-8

Cited by 19 publications

(11 citation statements)

References 46 publications

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“…The porosity of TiO 2 nanoparticle‐based film provides a better adsorbent surface than the compact layer. [ 25,45 ] The porosity of the sensing material can be confirmed by the FESEM image in Figure 3b. Also the FESEM image shown in Figure 3b shows the nanoparticles size in the film ranges from 50 nm to 100 nm.…”

Section: Resultsmentioning

confidence: 80%

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Washable Nanostructured Sensing Layer in a Reusable Printed Ammonia Sensor Label

Tripathy,

Bhattacharjee

2023

Adv Eng Mater

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Ammonia (NH3) in its aqueous solution form is used in various day‐to‐day applications such as laboratory reagents, fertilizers, household cleaning, etc. due to its solubility in water. Hence, it is extremely important to have a large‐scale sensing system to avoid unintended health hazards. In this paper, a printed washable TiO2 nanoparticle (NP) layer‐based sensing solution to detect evaporated ammonia from its aqueous solution has been demonstrated in this regard. The response has a range of 0.5 to 25% (w/v) and is found to be considerably linear in the low concentration level of the ammonia solution. The sensitivity is found to be 0.339/%. The sensor illustrates considerably easy fabrication, reusability, and gas adsorption on the sensing layer. Printed electrodes are employed on a flexible PET substrate with a washable sensing layer. It is observed that the longevity of the electrodes is considerably high. A maximum 7.5% variation in the response is observed for the re‐used sensor after washing. Further, it is found that the electrodes are stable enough to be used up to 4 months in ambient conditions. The sensor can be useful to monitor the leakage of NH3 solution in industrial complexes and also in households.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 80%

“…sensors for detection of evaporated ammonia from its aqueous solution. [12,[22][23][24][25][26] A comparison between different ammonia sensors available in the literature and with the developed in this work is given in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Washable Nanostructured Sensing Layer in a Reusable Printed Ammonia Sensor Label

Tripathy,

Bhattacharjee

2023

Adv Eng Mater

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“…When the sensing material is exposed to a reducing gas such as ammonia, the molecules of ammonia react with oxygen ions to produce NO and H 2 O. During this process, the captured electrons return to the conduction band, reducing the electron depletion layer on the surface of the sensing material, thereby increasing the sensor’s conductivity. , Oxygen molecular adsorption and ammonia detection can be represented by the following , normalO 2 ( ads ) + normale − → normalO 2 ( ads ) − 4 normalN normalH 3 ( gas ) + 5 normalO 2 ( ads ) − → 4 normalN normalO false( gas false) + 6 normalH 2 normalO + 5 normale − Herein, the improvement in the sensing performance of the α-Fe 2 O 3 @SnO 2 sensor can mainly be attributed to chemical sensitization and electronic sensitization. In the view of chemical sensitization, the decorated small SnO 2 NPs act as a catalyst for the chemical interaction between the α-Fe 2 O 3 and the ammonia.…”

Section: Resultsmentioning

confidence: 99%

Surface Enhancement Effects of Tiny SnO₂ Nanoparticle Modification on α-Fe₂O₃ for Room-Temperature NH₃ Sensing

Xu,

Lin,

Xiong

et al. 2023

Inorg. Chem.

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The development of a gas sensor capable of detecting ammonia with high selectivity and rapid response at room temperature has consistently posed a formidable challenge. To address this issue, the present study utilized a one-step solvothermal method to co-assemble α-Fe 2 O 3 and SnO 2 by evenly covering SnO 2 nanoparticles on the surface of α-Fe 2 O 3 . By controlling the morphology and Fe/Sn mole ratio of the composite, the as-prepared sample exhibits high-performance detection of NH 3 . At room temperature conditions, a gas sensor composed of α-Fe 2 O 3 @3%SnO 2 demonstrates a rapid response time of 14 s and a notable sensitivity of 83.9% when detecting 100 ppm ammonia. Experiments and density functional theory (DFT) calculations suggest that the adsorption capacity of α-Fe 2 O 3 to ammonia is enhanced by the surface effect provided by SnO 2 . Meanwhile, the existence of SnO 2 tailors the pore structure and effective surface area of α-Fe 2 O 3 , creating multiple channels for the diffusion and adsorption of ammonia molecules. Additionally, an N−N heterostructure is formed between α-Fe 2 O 3 and SnO 2 , which enhances the potential energy barrier and improves the ammonia sensing performance. Demonstration experiments have proved that the sensor shows significant advantages over commercial sensors in the process of ammonia detection in agricultural facilities. This work provides new insights into the perspectives on ammonia detection at room temperature.

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“…Additionally, the cross-section SEM shown in Figure 2f indicates disordered, not-well-aligned fibers when using a 5 sccm C2H2 flow. Figure 2b-d The morphology of CNFs such as other nanostructure materials is critically important in the sensing mechanism because it can cause a greater absorption area and a favorable electronic structure [31,32]. The microstructures of the samples were probed by a scanning electron microscope (SEM; Hitachi, Regulus-8230).…”

Section: Characterizationmentioning

confidence: 99%

Enhancement of Room Temperature Ethanol Sensing by Optimizing the Density of Vertically Aligned Carbon Nanofibers Decorated with Gold Nanoparticles

et al. 2022

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An ethanol gas sensor based on carbon nanofibers (CNFs) with various densities and nanoparticle functionalization was investigated. The CNFs were grown by means of a Plasma-Enhanced Chemical Vapor Deposition (PECVD), and the synthesis conditions were varied to obtain different number of fibers per unit area. The devices with a larger density of CNFs lead to higher responses, with a maximal responsivity of 10%. Furthermore, to simultaneously improve the sensitivity and selectivity, CNFs were decorated with gold nanoparticles by an impaction printing method. After metal decoration, the devices showed a response 300% higher than pristine devices toward 5 ppm of ethanol gas. The morphology and structure of the different samples deposited on a silicon substrate were characterized by TEM, EDX, SEM, and Raman spectroscopy, and the results confirmed the presence of CNF decorated with gold. The influence of operating temperature (OT) and humidity were studied on the sensing devices. In the case of decorated samples with a high density of nanofibers, a less-strong cross-sensitivity was observed toward a variation in humidity and temperature.

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Ammonia room-temperature gas sensor using different TiO2 nanostructures

Cited by 19 publications

References 46 publications

Washable Nanostructured Sensing Layer in a Reusable Printed Ammonia Sensor Label

Washable Nanostructured Sensing Layer in a Reusable Printed Ammonia Sensor Label

Surface Enhancement Effects of Tiny SnO₂ Nanoparticle Modification on α-Fe₂O₃ for Room-Temperature NH₃ Sensing

Enhancement of Room Temperature Ethanol Sensing by Optimizing the Density of Vertically Aligned Carbon Nanofibers Decorated with Gold Nanoparticles

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Ammonia room-temperature gas sensor using different TiO2 nanostructures

Cited by 19 publications

References 46 publications

Washable Nanostructured Sensing Layer in a Reusable Printed Ammonia Sensor Label

Washable Nanostructured Sensing Layer in a Reusable Printed Ammonia Sensor Label

Surface Enhancement Effects of Tiny SnO2 Nanoparticle Modification on α-Fe2O3 for Room-Temperature NH3 Sensing

Enhancement of Room Temperature Ethanol Sensing by Optimizing the Density of Vertically Aligned Carbon Nanofibers Decorated with Gold Nanoparticles

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Surface Enhancement Effects of Tiny SnO₂ Nanoparticle Modification on α-Fe₂O₃ for Room-Temperature NH₃ Sensing