ZnO-Co3O4 heterostructure electrospun nanofibers modified with poly(sodium 4-styrenesulfonate): Evaluation of humidity sensing properties

André, Rafaela S.; Pereira, Jessica C.; Mercante, Luiza A.; Locilento, Danilo A.; Mattoso, Luiz H. C.; Corrêa, Daniel S.

doi:10.1016/j.jallcom.2018.07.132

Cited by 29 publications

(11 citation statements)

References 42 publications

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“…Pristine SiO 2 :ZnO nanofibers were characterized by SEM and EDS, confirming the 1D morphology and expected element composition, as presented in Figure S5, and XRD in Figure S5c. The amorphous character of SiO 2 is evidenced by a broad band between 15 and 35°, while a ZnO feature is observed at 36.1°, which is attributed to the preferred diffraction plane (101) of the hexagonal zincite crystalline structure (JCPDS n° 36-1451). − The SEM image of NF/DNP-CNT, shown in Figure a, confirms that the SiO 2 :ZnO nanofibers (larger gray structures) and the modified carbon nanotubes (light brown structures) create an interconnected porous NF/CNT network . The FTIR spectra of DNP-CNT, pristine SiO 2 :ZnO NF, and NF/DNP-CNT are presented in Figure b.…”

Section: Results and Discussionmentioning

confidence: 77%

Wireless Tags with Hybrid Nanomaterials for Volatile Amine Detection

et al. 2021

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Quality control in the production and processing of raw meat is currently one of the biggest concerns for food industry and would benefit from portable and wireless sensors capable of detecting the onset of spoilage. Raw meat is a natural source of biogenic and volatile amines as byproducts of decarboxylation reactions, and the levels of these compounds can be utilized as quality control parameters. We report herein a hybrid chemiresistor sensor based on inorganic nanofibers of SiO 2 :ZnO (an n-type material) and single-walled carbon nanotubes functionalized with 3,5-dinitrophenyls (a p-type material) with dosimetric sensitivity ∼40 times higher for amines than for other volatile organic compounds, which also provides excellent selectivity. The hybrid nanomaterial-based chemiresistor sensory material was used to convert radio-frequency identification tags into chemically actuated resonant devices, which constitute wireless sensors that can be potentially employed in packaging to report on the quality of meat. Specifically, the as-developed wireless tags report on cumulative amine exposure inside the meat package, showing a decrease in radio-frequency signals to the point wherein the sensor ceased to be smartphone-readable. These hybrid material-modified wireless tags offer a path to scalable, affordable, portable, and wireless chemical sensor technology for food quality monitoring without the need to open the packaging.

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Section: Results and Discussionmentioning

confidence: 77%

Wireless Tags with Hybrid Nanomaterials for Volatile Amine Detection

et al. 2021

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“…In addition, when the nanoparticles are combined with PSS and PPy, the charge transfer is greatly enhanced, which is confirmed by the reduction of electrical resistance at 10 kHz (Figure 3D) and is in agreement with previous reports. 25,26 Therefore, aiming at the achievement of high discrimination performance, the platforms based on polymer/ inorganic nanocomposites were chosen to compose the sensor array for coffee analysis.…”

Section: Resultsmentioning

confidence: 99%

“…10,28,29 The main contribution of our work relies on the development of a simple and suitable sensing array based on the combination of metal oxide semiconductor and conjugated polymers to achieve synergistic effects and avoid drawbacks of the isolated materials (e.g., low conductivity and poor stability of organic materials, and high-temperature operation, poor selectivity, and low sensitivity of inorganic materials). 26,27 Our findings suggest an alternative method to help in the monitoring of coffee quality and classification, in addition to human sensory panels and available analytical systems.…”

Section: Introductionmentioning

confidence: 89%

“…In this context, herein we propose a facile semiconductor nanoparticles functionalization approach using polypyrrole (PPy) and poly(styrenesulfonate) (PSS) for developing sensing units to construct an electronic nose for coffee aroma analysis at room temperature. Although previous works have reported the use of e-nose systems for coffee evaluation, most of them are based on commercial and unmodified electrodes. ,, The main contribution of our work relies on the development of a simple and suitable sensing array based on the combination of metal oxide semiconductor and conjugated polymers to achieve synergistic effects and avoid drawbacks of the isolated materials (e.g., low conductivity and poor stability of organic materials, and high-temperature operation, poor selectivity, and low sensitivity of inorganic materials). , Our findings suggest an alternative method to help in the monitoring of coffee quality and classification, in addition to human sensory panels and available analytical systems.…”

Section: Introductionmentioning

confidence: 94%

“…The construction of the sensor array requires the diversification of sensing materials, and the performance of the e-nose benefits from the partial selectivity and specificity diversity among the sensing units. , In this direction, semiconductor nanostructures with excellent receptor and transducer functions have been widely used for developing gas sensor arrays. , Furthermore, the performance of these materials as sensing layers can be significantly improved by the functionalization or modification of their composition, size, and shape. , For instance, the combination of semiconducting nanomaterials with electrolytic and conjugated polymers has been reported as an efficient approach to provide improved gas sensor performance at room temperature. − …”

Section: Introductionmentioning

confidence: 99%

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Nanocomposite-Based Chemiresistive Electronic Nose and Application in Coffee Analysis

André

Campaner

Facure

et al. 2021

ACS Food Sci. Technol.

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The demand for accurate and rapid quality inspection of agricultural and food products has progressively increased since it is one of the important key attributes in determining consumer preference. In this sense, electronic nose (e-nose) devices capable of capturing a “smellprint” of food products, combined to pattern recognition tools are advantageous for the discrimination of similar complex mixtures. The design of the sensing units composing the e-nose requires a judicious choice of materials with distinct selectivity and specificity for achieving outstanding performance. The present work reports on the development of an e-nose based on nanocomposites obtained by the combination of ZnO, In2O3, and ZnO/In2O3 nanoparticles with polypyrrole and poly(styrenesulfonate). The sensor array was composed by six sensing units, which were exposed to 17 coffee samples. The coffee samples were successfully discriminated by quality level with the aid of principal components analysis and Euclidian distances by dendrograms. Therefore, the sensor array made with nanocomposites is promising as an alternative tool for monitoring the quality and classification of coffee samples.

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