Enhanced room-temperature ammonia-sensing properties of polyaniline-modified WO3 nanoplates derived via ultrasonic spray process

Fan, Guijun; Chen, Deliang; Li, Tao; Yi, Shasha; Ji, Haipeng; Wang, Yu; Zhang, Zhongtao; Shao, Gang; Fan, Bingbing; Wang, Hailong; Xu, Hongliang; Lu, Hongxia; Zhou, Ying; Zhang, Rui; Sun, Jing

doi:10.1016/j.snb.2020.127892

Cited by 56 publications

(34 citation statements)

References 56 publications

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“…Moreover, the reproducibility and the repeatability of our PANI-Au-SPE was proven by comparing electrodes with different connection geometries ( Figure 9 a) and by performing several continuous cycles ( Figure 9 b). Finally, as the selectivity of PANI for NH 3 detection was already proven [ 21 , 26 , 30 , 71 ], our PANI-Au-SPE sensor is an excellent example of an NH 3 sensor system. Generally, after comparing our work with previously reported studies [ 6 , 8 , 30 , 70 , 71 , 72 , 73 ] we can conclude that electrochemically deposited PANI is an under-examined but up-and-coming area of NH 3 gas sensing.…”

Section: Resultsmentioning

confidence: 79%

“…Finally, as the selectivity of PANI for NH 3 detection was already proven [ 21 , 26 , 30 , 71 ], our PANI-Au-SPE sensor is an excellent example of an NH 3 sensor system. Generally, after comparing our work with previously reported studies [ 6 , 8 , 30 , 70 , 71 , 72 , 73 ] we can conclude that electrochemically deposited PANI is an under-examined but up-and-coming area of NH 3 gas sensing. Due to its practical and controllable preparation via electropolymerisation and SPE’s direct use, the proposed procedure reveals novel aspects for NH 3 sensing.…”

Section: Resultsmentioning

confidence: 79%

“…The olive squares represent the relative PANI-Au-SPE sensor’s response and the red curve, the variation in the NH 3 concentration at the same time, monitored by the analyser. The PANI-Au-SPE shows the character of a typical p-type semiconductor [ 70 , 71 ], as its resistance increases upon exposure to NH 3 . The NH 3 sensing by the PANI follows the well-known deprotonation/protonation mechanism [ 25 , 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…All the presented PANI systems from the literature were based on a chemically synthesised PANI and without the presence of any nanomaterials. Indeed, the PANI/HCl from a chemical synthesis Table 1 summarises the characteristics of the PANI-Au-SPE sensor constructed and studied here with state-of-the-art PANI NH 3 sensors at RT [8,30,[70][71][72][73]. All the presented PANI systems from the literature were based on a chemically synthesised PANI and without the presence of any nanomaterials.…”

Section: Nh 3 -Sensing Performance Of the Pani-au-spementioning

confidence: 99%

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Facile Fabrication of an Ammonia-Gas Sensor Using Electrochemically Synthesised Polyaniline on Commercial Screen-Printed Three-Electrode Systems

Korent

Soderžnik

Šturm

et al. 2020

Sensors

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Polyaniline (PANI) is a conducting polymer, widely used in gas-sensing applications. Due to its classification as a semiconductor, PANI is also used to detect reducing ammonia gas (NH3), which is a well-known and studied topic. However, easier, cheaper and more straightforward procedures for sensor fabrication are still the subject of much research. In the presented work, we describe a novel, more controllable, synthesis approach to creating NH3 PANI-based receptor elements. The PANI was electrochemically deposited via cyclic voltammetry (CV) on screen-printed electrodes (SPEs). The morphology, composition and surface of the deposited PANI layer on the Au electrode were characterised with electron microscopy, Fourier-transform infrared spectroscopy and profilometry. Prior to the gas-chamber measurement, the SPE was suitably modified by Au sputtering the individual connections between the three-electrode system, thus showing a feasible way of converting a conventional three-electrode electrochemical SPE system into a two-electrode NH3-gas detecting system. The feasibility of the gas measurements’ characterisation was improved using the gas analyser. The gas-sensing ability of the PANI-Au-SPE was studied in the range 32–1100 ppb of NH3, and the sensor performed well in terms of repeatability, reproducibility and sensitivity.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Nh 3 -Sensing Performance Of the Pani-au-spementioning

confidence: 99%

See 2 more Smart Citations

Facile Fabrication of an Ammonia-Gas Sensor Using Electrochemically Synthesised Polyaniline on Commercial Screen-Printed Three-Electrode Systems

Korent

Soderžnik

Šturm

et al. 2020

Sensors

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“…Heretofore, the tungsten sources used for synthesizing functional WO 3 nanomaterials are mainly some analytical reagents or extremely high-purity tungsten metals, such as Na 2 WO 4 [27], H 2 WO 4 [28] [30], etc., which not only have high production costs, but also show low plasticity in terms of purity, particle size, etc. Thus, these disadvantages will affect the microstructure and physic-chemical properties of WO 3 nanomaterials prepared later.…”

Section: Introductionmentioning

confidence: 99%

NH3 sensing performance of Pt-doped WO3·0.33H2O microshuttles induced from scheelite leaching solution

Zhou

Zhao

et al. 2021

Vacuum

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WO 3 •0.33H 2 O microshuttles (WMSs) self-assembled by numerous nanorods along the same direction were prepared based on a cheap tungsten-containing metallurgical raw material by combination processes of NaOH leaching and one-step hydrothermal method. The microstructures and gas sensing properties of various concentrations (0, 0.7, 1.0, and 1.3 mol%) of Pt-doped WMSs were investigated to improve their performance. The microstructural characterizations demonstrated that the WMSs assembled by one-dimensional WO 3 •0.33H 2 O nanorods were approximately 0.8−1.9 µm in diameter. Such nanorods exhibited a single hexagonal structure with their diameters ranging from 17 to 62 nm. The gas sensing properties indicated that Pt-doped WMSs showed superior gas sensing performance in terms of the sensor response and NH 3 selectivity in the operating temperature range of 25−225 o C as compared with pure one, and simultaneously Pt doping could signi cantly reduce the detection limit of NH 3. Especially, 1.0 mol% Pt-doped WMSs exhibited highest response of 28.2 to 1000 ppm NH 3 at 175 o C, which was 4 times higher than pure one at 50 o C. The remarkably enhanced gas sensing performance of Pt-doped WMSs to NH 3 could be ascribed to the electronic and chemical sensitization mechanisms of noble metal nanoparticles.

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Conducting Polymer Based Ammonia and Hydrogen Sulfide Chemical Sensors and Their Suitability for Detecting Food Spoilage

Preethichandra

Gholami

Izake

et al. 2022

Adv Materials Technologies

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health problems such as food poisoning. On the other hand, if non-spoiled food is thrown away as it passes the prespecified expiry date/time, then it is a waste of a valuable food resource. Annual food wastage accounts for one-third of the world's food production and in response to this problem, the Food and Agriculture Organization (FAO) of the United Nations has set one of the sustainable development goals (SDGs) to address it. SDG 12.3 has set the target of halving per capita global food waste at the retail and consumer levels and reducing food loss along both production and supply chains (including post-harvest losses) by 2030. [2] Therefore, a demand for novel food spoilage detection sensors for real-time monitoring of food quality is obvious. Food packaging processes are mainly performed at atmospheric conditions where air-carrying microorganisms may remain inside the sealed food packages. This provides a suitable environment for microorganisms to thrive within the package due to this air capture. Some types of microorganisms, such as Brochothrix thermosphacta, Carnobacterium spp., Lactobacillus spp., Lactococcus spp., Leuconostoc spp., Pediococcus spp., Stretococcus spp., Kurthia zopfii, and Weisella spp, [3] cause disintegration of the food and produce various gasses such as hydrogen sulfide (H 2 S), carbon dioxide (CO 2 ), ammonia (NH 3 ), methane (CH 4 ), and other volatile organic compounds (VOCs). [4][5][6][7][8] The CO 2 level in atmospheric air is around 415 ppm and therefore detecting a variation of CO 2 concentration inside a food package at the very early stages of food spoilage is quite challenging. However, there are other types of food packaging called modified atmospheric packaging (MAP), where the package is vacuum-sealed or filled with different gases such as nitrogen combined with an antimicrobial active gas, such as carbon dioxide, to provide a barrier against food spoilage and improve the shelf-lifetime of the product. [9] There are multiple methods which are proposed by various research groups either for detecting the food spoilage or monitoring the food quality at early stages. Various parameters such as O 2 /CO 2 /NH 3 /H 2 S/VOC concentrations, temperature, humidity, pH value, and any specific chemicals inside the food package can be detected using a wide range of measurement techniques. [9] Figure 1 illustrates the three most common food categories and the gases that are emitted by microorganisms Food security is critical for the sustainability of society. The spoilage of stocked food is an ongoing problem that causes significant losses to the global economy. Novel portable analytical platforms that provide timely information on the condition of food stock can support informed decisionmaking on the safety of food consumption as well as on maximization of food storage lifetime. Ammonia (NH 3 ) and hydrogen sulfide (H 2 S) are two of the major harmful gases that are produced due to bacteria activity during the food spoilage process. The timely detection of these gases in food stocks h...

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Enhanced room-temperature ammonia-sensing properties of polyaniline-modified WO3 nanoplates derived via ultrasonic spray process

Cited by 56 publications

References 56 publications

Facile Fabrication of an Ammonia-Gas Sensor Using Electrochemically Synthesised Polyaniline on Commercial Screen-Printed Three-Electrode Systems

Facile Fabrication of an Ammonia-Gas Sensor Using Electrochemically Synthesised Polyaniline on Commercial Screen-Printed Three-Electrode Systems

NH3 sensing performance of Pt-doped WO3·0.33H2O microshuttles induced from scheelite leaching solution

Conducting Polymer Based Ammonia and Hydrogen Sulfide Chemical Sensors and Their Suitability for Detecting Food Spoilage

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