A flexible polypyrrole/silk-fiber ammonia sensor assisted by silica nanosphere template

She, Changkun; Li, Guishun; Zhang, Wenqian; Xie, Guoxing; Zhang, Yu; Li, Lei; Yue, Fangyu; Liu, Shaohua; Jing, Chengbin; Cheng, Ya; Chu, Junhao

doi:10.1016/j.sna.2020.112436

Cited by 32 publications

(18 citation statements)

References 53 publications

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“…The PPy film was prepared via the in situ chemical oxidation method using silica nanospheres as a template. The response of the PPy/NS@silk-fiber sensor (73.25%) was five-fold higher than that of the PPy/NS@sponge sensor (14.51%), when exposed to 100 ppm NH3, in (68 ± 5)% relative humidity, at room temperature [108]. Sulfonated poly(ether-ether ketone) (SPEEK) and polyacrylonitrile were used as a core for PPy nanofibers based gas sensors in order to improve the mechanical flexibility and to facilitate ammonia diffusion in the film [109].…”

Section: Gas Sensorsmentioning

confidence: 83%

Flexible Sensors Based on Conductive Polymers

Pavel

Lakard

2022

Chemosensors

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Conductive polymers have attracted wide attention since their discovery due to their unique properties such as good electrical conductivity, thermal and chemical stability, and low cost. With different possibilities of preparation and deposition on surfaces, they present unique and tunable structures. Because of the ease of incorporating different elements to form composite materials, conductive polymers have been widely used in a plethora of applications. Their inherent mechanical tolerance limit makes them ideal for flexible devices, such as electrodes for batteries, artificial muscles, organic electronics, and sensors. As the demand for the next generation of (wearable) personal and flexible sensing devices is increasing, this review aims to discuss and summarize the recent manufacturing advances made on flexible electrochemical sensors

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Section: Gas Sensorsmentioning

confidence: 83%

Flexible Sensors Based on Conductive Polymers

Pavel

Lakard

2022

Chemosensors

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“…The sensor displayed a response to a wide range of NH 3 concentrations from 1 to 225 ppm and an LoD of 1 ppm with a response of 73.25% at 100 ppm NH 3 . [ 137 ] The response and recovery times recorded were 24 and 69 s, respectively which are considerably fast for food spoilage detection applications. Qui et al.…”

Section: Ammonia Gas Sensorsmentioning

confidence: 99%

“…SiO 2 and silicon nanowires have been used by some research groups to develop the backbone for PPY deposition in the process of developing NH 3 sensors. [137,138] A flexible ammonia sensor fabricated on a silk fiber backbone was presented by She et al [137] They deposited PPY with the support of silica nanospheres on the pre-treated silk fibers by chemical oxidative polymerization. The fabrication process of the silk fiber based NH 3 gas sensor and how the silk fibers were separated and how the PPY/silica nanospheres layer was deposited are illustrated in Figure 19.…”

Section: Polypyrrole-based Ammonia Sensorsmentioning

confidence: 99%

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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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“…Relevant examples include wearable sensors realised using PANi-coated ZnO nanosheets [ 13 ] and PANI-functionalized multiwalled carbon nanotubes (MWCNTs) [ 14 , 15 ] on fabric substrates and plastic fibers, graphene oxide/PANi nanospheres [ 16 ] and PANi-CeO 2 nanocomposite [ 17 ] on plastic foils, and bacterial cellulose functionalised with co-doped PANi nanorods [ 18 ]. Flexible, CP-based NH 3 gas sensors have also been obtained using nanostructures and composites of poly(3,4-ethylenedioxythiophene) (PEDOT) [ 19 , 20 , 21 ], as well as Polypyrrole (PPy) [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

A Wearable Electrochemical Gas Sensor for Ammonia Detection

Serafini

Mariani

Gualandi

et al. 2021

Sensors

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The next future strategies for improved occupational safety and health management could largely benefit from wearable and Internet of Things technologies, enabling the real-time monitoring of health-related and environmental information to the wearer, to emergency responders, and to inspectors. The aim of this study is the development of a wearable gas sensor for the detection of NH3 at room temperature based on the organic semiconductor poly(3,4-ethylenedioxythiophene) (PEDOT), electrochemically deposited iridium oxide particles, and a hydrogel film. The hydrogel composition was finely optimised to obtain self-healing properties, as well as the desired porosity, adhesion to the substrate, and stability in humidity variations. Its chemical structure and morphology were characterised by infrared spectroscopy and scanning electron microscopy, respectively, and were found to play a key role in the transduction process and in the achievement of a reversible and selective response. The sensing properties rely on a potentiometric-like mechanism that significantly differs from most of the state-of-the-art NH3 gas sensors and provides superior robustness to the final device. Thanks to the reliability of the analytical response, the simple two-terminal configuration and the low power consumption, the PEDOT:PSS/IrOx Ps/hydrogel sensor was realised on a flexible plastic foil and successfully tested in a wearable configuration with wireless connectivity to a smartphone. The wearable sensor showed stability to mechanical deformations and good analytical performances, with a sensitivity of 60 ± 8 μA decade−1 in a wide concentration range (17–7899 ppm), which includes the safety limits set by law for NH3 exposure.

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A flexible polypyrrole/silk-fiber ammonia sensor assisted by silica nanosphere template

Cited by 32 publications

References 53 publications

Flexible Sensors Based on Conductive Polymers

Flexible Sensors Based on Conductive Polymers

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

A Wearable Electrochemical Gas Sensor for Ammonia Detection

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