Development and characterization of composite carbon nanofibers surface-coated with ZnO/Ag nanoparticle arrays for ammonia sensor application

Kharaghani, Davood; Suzuki, Yoshiyuki; Gitigard, Parastoo; Ullah, Sana

doi:10.1016/j.mtcomm.2020.101213

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…There have been several promising NH 3 sensors reported based on inorganic and organic materials. [73][74][75][76][77][78] There are good room temperature Cu based NH 3 sensors where Mahnaz et al presented a sensor with responses of 11% at 50 ppm of NH 3 and 36.46% at 6 ppm of NO 2 . [79] Faegheh et al presented a sensor with responses of 4.34% at 99 ppm of NH 3 and 7.3% at 6 ppm of NO 2 .…”

Section: Ammonia Gas Sensorsmentioning

confidence: 99%

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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Section: Ammonia Gas Sensorsmentioning

confidence: 99%

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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show abstract

“…[1] Decorating polymer composites with a novel metal is a new research area with huge interest. [2] Owing to their high flexibility, improved stability, and hydrophobic properties, nanocomposites can be employed in a wide range of applications, from energy storage devices/sensors [3] to optical devices. [4] Polymers form various chemical bonds containing metal nanoparticles (NPs), thereby enhancing the stability of nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

et al. 2022

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In the present investigation, silver (Ag) nanoparticles were prepared employing green synthesis from the aqueous leaves extract of Cyperus rotundus (CR) plant at ambient temperature in less reaction time. A preliminary phytochemical analysis test was performed, and it has been revealed that the extract comprised bioactive components such as alkaloids, phenols, and terpenoids, among others. For average size, the morphology (spherical shape) and purity of the nanoparticles were characterized using scanning electron microscopy (SEM, 358 nm) with energy-dispersive X-ray (EDX), dynamic light scattering (27 nm), high-resolution transmission electron microscopy (3.9 nm), and selected area electron diffraction (SAED) pattern methods. Without any extra peaks in the EDX spectrum, the produced Ag nanoparticles were confirmed to be pure. In addition, the solvent-casting approach has been used to encapsulate a different weight fraction of biosynthesized Ag nanoparticles (CRÀ AgÀ NPs) in a polyvinyl alcohol (PVA) matrix. By using UV-visible, FTIR spectroscopy, and SEM, we were able to characterize the synthesized CRÀ AgÀ NPs as well as their composite (PVA) films, and we were able to compare the results with those of pristine PVA. The effects of doping with CRÀ AgÀ NPs on structural and morphological changes of PVA were studied. Impedance studies, including dielectric constant, dielectric loss, tangent loss, and AC conductivity, revealed that incorporating CRÀ AgÀ NPs into the PVA matrix impacts the electrical properties of PVA. This study showed that the synthesized nanoparticles had a spherical shape with entangled biocomponents and were encapsulated within the PVA polymer matrix, indicating that CRÀ AgÀ NPs can be used in various applications (wound healing).

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“…Electrospinning is a technique to produce the nonwoven mats that offer a large surface-area-to-mass ratio. Nanofibers produced by electrospinning have a diameter in the range of some nanometers to sub-micron while the length of nanofibers can be in the range of some microns to sub-millimeter [4][5][6][7][8][9][10]. Due to high surface area, nanofibers from hydrophilic polymers may have the best utilization in water adsorption or absorption.…”

Section: Introductionmentioning

confidence: 99%

Optimized Loading of Carboxymethyl Cellulose (CMC) in Tri-component Electrospun Nanofibers Having Uniform Morphology

Hashmi

Ullah

et al. 2020

Polymers

Self Cite

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Cellulose is one of the most hydrophilic polymers with sufficient water holding capacity but it is unstable in aqueous conditions and it swells. Cellulose itself is not suitable for electrospun nanofibers’ formation due to high swelling, viscosity, and lower conductivity. Carboxymethyl cellulose (CMC) is also super hydrophilic polymer, however it has the same trend for nanofibers formation as that of cellulose. Due to the above-stated reasons, applications of CMC are quite limited in nanotechnology. In recent research, loading of CMC was optimized for electrospun tri-component polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), and carboxymethyl cellulose (CMC) nanofibers aim at widening its area of applications. PVA is a water-soluble polymer with a wide range of applications in water filtration, biomedical, and environmental engineering, and with the advantage of easy process ability. However, it was observed that only PVA was not sufficient to produce PVA/CMC nanofibers via electrospinning. To increase spinnability of PVA/CMC nanofibers, PVP was selected as the best available option because of its higher conductivity and water solubility. Weight ratios of CMC and PVP were optimized to produce uniform nanofibers with continuous production as well. It was observed that at a weight ratio of PVP 12 and CMC 3 was at the highest possible loading to produce smooth nanofibers.

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Development and characterization of composite carbon nanofibers surface-coated with ZnO/Ag nanoparticle arrays for ammonia sensor application

Cited by 6 publications

References 28 publications

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

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

Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

Optimized Loading of Carboxymethyl Cellulose (CMC) in Tri-component Electrospun Nanofibers Having Uniform Morphology

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