Percolating Metallic Structures Templated on Laser-Deposited Carbon Nanofoams Derived from Graphene Oxide: Applications in Humidity Sensing

Nufer, Sebastian; Fantanas, Dimitrios; Ogilvie, Sean P.; Large, Matthew J.; Winterauer, Dominik J.; Salvage, Jonathan P.; Meloni, Manuela; King, Alice A. K.; Schellenberger, Pascale; Shmeliov, Aleksey; Víctor-Román, Sandra; Peláez-Fernández, Mario; Nicolosi, Valeria; Arenal, Raúl; Benito, Ana M.; Maser, Wolfgang K.; Brunton, Adam N.; Dalton, Alan B.

doi:10.1021/acsanm.8b00246

Cited by 12 publications

(18 citation statements)

References 32 publications

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“…The direct-deposited CNF in Figure a has a low-density, high-porosity structure with a weblike microstructure. This morphology is typical for a diffusion-limited aggregation formation process . The magnified image in Figure b reveals the porous microstructure formed by the clusters, which are then spun into a “web” like appearance.…”

Section: Results and Discussionmentioning

confidence: 87%

“…This morphology is typical for a diffusion-limited aggregation formation process. 17 The magnified image in Figure 3b reveals the porous microstructure formed by the clusters, which are then spun into a “web” like appearance. The volumetric character of the CNF did not allow further magnification without charging effects.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The exact experimental setup to create the CNF is described elsewhere . A brief summary is as follows: the targets were irradiated with a Multiwave Nd:YAG nanosecond pulsed infrared laser (set at 10 ns) in ambient conditions with a set fluence of 417 mJ/cm 2 .…”

Section: Methodsmentioning

confidence: 99%

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Carbon Nanofoam Supercapacitor Electrodes with Enhanced Performance Using a Water-Transfer Process

et al. 2018

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Carbon nanofoam (CNF) is a highly porous, amorphous carbon nanomaterial that can be produced through the interaction of a high-fluence laser and a carbon-based target material. The morphology and electrical properties of CNF make it an ideal candidate for supercapacitor applications. In this paper, we prepare and characterize CNF supercapacitor electrodes through two different processes, namely, a direct process and a water-transfer process. We elucidate the influence of the production process on the microstructural properties of the CNF, as well as the final electrochemical performance. We show that a change in morphology due to capillary forces doubles the specific capacitance of the wet-transferred CNF electrodes.

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Section: Results and Discussionmentioning

confidence: 87%

Section: Results and Discussionmentioning

confidence: 99%

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Carbon Nanofoam Supercapacitor Electrodes with Enhanced Performance Using a Water-Transfer Process

et al. 2018

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“…The most common nanocarbon species include: carbon nanotubes and their nanocomposites [49,50], carbon-quantum dots [51,52], fullerenes and their derivatives [53,54], graphene and its nanocomposites [55][56][57][58], carbon nanofoam [59], oxidized carbon nano-onions and their nanocomposites [60][61][62][63], graphene oxide (GO) and its nanocomposites [64,65], carbon nanohorns, oxidized carbon nanohorns (CNHox) and their nanocomposites [66][67][68][69][70][71][72].…”

Section: Introductionmentioning

confidence: 99%

Quaternary Oxidized Carbon Nanohorns—Based Nanohybrid as Sensing Coating for Room Temperature Resistive Humidity Monitoring

et al. 2021

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We report the relative humidity (RH) sensing response of a resistive sensor, employing sensing layers, based on a quaternary organic–inorganic hybrid nanocomposite comprising oxidized carbon nanohorns (CNHox), graphene oxide (GO), tin dioxide, and polyvinylpyrrolidone (PVP), at 1/1/1/1 and 0.75/0.75/1/1/1 mass ratios. The sensing structure comprises a silicon substrate, a SiO2 layer, and interdigitated transducer (IDT) electrodes. The sensing film was deposited via the drop-casting method on the sensing structure. The morphology and the composition of the sensing layers were investigated through Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), and RAMAN spectroscopy. The organic–inorganic quaternary hybrid-based thin film’s resistance increased when the sensors were exposed to relative humidity ranging from 0 to 100%. The manufactured devices show a room temperature response comparable to that of a commercial capacitive humidity sensor and characterized by excellent linearity, rapid response and recovery times, and good sensitivity. While the sensor with CNHox/GO/SnO2/PVP at 0.75/0.75/1/1 as the sensing layer has the best performance in terms of linearity and recovery time, the structures employing the CNHox/GO/SnO2/PVP at 1/1/1/1 (mass ratio) have a better performance in terms of relative sensitivity. We explained each constituent of the quaternary hybrid nanocomposites’ sensing role based on their chemical and physical properties, and mutual interactions. Different alternative mechanisms were taken into consideration and discussed. Based on the sensing results, we presume that the effect of the p-type semiconductor behavior of CNHox and GO, correlated with swelling of PVP, dominates and leads to the overall increasing resistance of the sensing layer. The hard–soft acid–base (HSAB) principle also supports this mechanism.

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“…With an increasing demand for low cost and high performance humidity sensors, various nanomaterials that are sensitive to water molecules have been adopted, including semiconducting oxides , transition metal disulfide , porous silicon , carbon nanomaterials , and polymers . Particularly, carbon nanomaterials show great promise for sensor applications due to their high electrical conductivity, large surface area to volume ratio, chemical inertness and easy functionalization . Adsorption of water molecules on the surface of the carbon nanomaterials modifies their physico‐chemical properties, for example, electrical conductivity .…”

Section: Introductionmentioning

confidence: 99%

A humidity‐sensing composite microfiber based on moisture‐induced swelling of an agarose polymer matrix

et al. 2019

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Herein, we present a humidity sensing microfiber based on an agarose polymer as a hydrophilic matrix and carbon nanotubes (CNT) as conducting fillers. The humiditydependent resistance is the key property of the composite microfiber as a humidity sensor. The composite microfiber composed of the agarose matrix swells or contracts depending on environmental humidity, leading to changes in junction density between the carbon nanotube conducting fillers inside the fiber. Moreover, adsorption of water molecules on the CNT filler could further increase the resistance of the microfiber sensor. The real-time resistance monitoring of the microfiber shows reliable and reversible response to the repetitive changes in relative humidity with reasonable response rate. The tensile strength test confirms the mechanical robustness of the composite microfiber. The fabrication process is facile and presumably scalable. Such a practical fiber sensor could be readily used as a humidity-sensing component in smart textile and wearable devices. POLYM. COMPOS., 40:3582-3587, 2019.

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Percolating Metallic Structures Templated on Laser-Deposited Carbon Nanofoams Derived from Graphene Oxide: Applications in Humidity Sensing

Abstract: Raul et al. (2018) Percolating metallic structures templated on laser-deposited carbon nanofoams derived from graphene oxide: applications in humidity sensing. ACS Applied Nano Materials, 1 (4). pp. 1828-1835.

Cited by 12 publications

References 32 publications

Carbon Nanofoam Supercapacitor Electrodes with Enhanced Performance Using a Water-Transfer Process

Carbon Nanofoam Supercapacitor Electrodes with Enhanced Performance Using a Water-Transfer Process

Quaternary Oxidized Carbon Nanohorns—Based Nanohybrid as Sensing Coating for Room Temperature Resistive Humidity Monitoring

A humidity‐sensing composite microfiber based on moisture‐induced swelling of an agarose polymer matrix

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