Design guidelines of laser reduced graphene oxide conformal thermistor for IoT applications

Romero, Francisco J.; Rivadeneyra, Almudena; Toral, Víctor; Castillo, Encarnación; García-Ruiz, Francisco; Morales, Diego P.; Rodríguez, Noel

doi:10.1016/j.sna.2018.03.014

Cited by 44 publications

(33 citation statements)

References 21 publications

(23 reference statements)

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“…The results obtained are presented in Table 3 . Silver and carbon-based contacts were printed on the ablated surface with the pattern presented in Figure 2 b, while the rGO contacts were fabricated from the laser-assisted reduction of a GO electrode over the Kapton ® ablated surface [ 47 ]. We report promissing contact-resistance values,

, as low as 2

for the Ag and AgCl electrodes, while the reduced-GO and the carbon resistive paste ones yield a contact resistance of ∼75

and ∼125

, respectively.…”

Section: Resultsmentioning

confidence: 99%

In-Depth Study of Laser Diode Ablation of Kapton Polyimide for Flexible Conductive Substrates

et al. 2018

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This work presents a detailed study of the photothermal ablation of Kapton® polyimide by a laser diode targeting its electrical conductivity enhancement. Laser-treated samples were structurally characterized using Scanning Electron Microscopy (SEM), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), as well as Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy. The results show that the laser-assisted ablation constitutes a simple one-step and environmental friendly method to induce graphene-derived structures on the surface of polyimide films. The laser-modified surface was also electrically characterized through the Transmission Line Method (TLM) aiming at the improvement of the conductivity of the samples by tuning the laser power and the extraction of the contact resistance of the electrodes. Once the laser-ablation process is optimized, the samples increase their conductivity up to six orders of magnitude, being comparable to that of graphene obtained by chemical vapor deposition or by the reduction of graphene-oxide. Additionally, we show that the contact resistance can be decreased down to promising values of ∼2 Ω when using silver-based electrodes.

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, as low as 2

for the Ag and AgCl electrodes, while the reduced-GO and the carbon resistive paste ones yield a contact resistance of ∼75

and ∼125

, respectively.…”

Section: Resultsmentioning

confidence: 99%

In-Depth Study of Laser Diode Ablation of Kapton Polyimide for Flexible Conductive Substrates

et al. 2018

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“…As has been reported in previous works, one of the distinctive features of LIG, which is common for both UV and CO 2 laser exposition sources, is its highly porous structure, which is a consequence of the rapid liberation of gaseous products during the laser-scribing process, also associated with the drastic increase in the atomic percentage of carbon [34,[40][41][42]. In the case of the LrGO, the laser treatment on the surface of the GO leads to a partial restoration of the crystallographic network of its graphitic structure, which was disrupted during the oxidation process [43]. However, this partial recovery makes the surface of the resulting material to present structural defects manifested thorough a large roughness and a 3D plate-shape structure with multiple craters, a phenomenon that has been reported for both UV [44] and CO 2 lasers [45], and that could be helpful to increase their double layer capacitance effect.…”

Section: Resultsmentioning

confidence: 99%

Comparison of Laser-Synthetized Nanographene-Based Electrodes for Flexible Supercapacitors

et al. 2020

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In this paper, we present a comparative study of a cost-effective method for the mass fabrication of electrodes to be used in thin-film flexible supercapacitors. This technique is based on the laser-synthesis of graphene-based nanomaterials, specifically, laser-induced graphene and reduced graphene oxide. The synthesis of these materials was performed using two different lasers: a CO2 laser with an infrared wavelength of λ = 10.6 µm and a UV laser (λ = 405 nm). After the optimization of the parameters of both lasers for this purpose, the performance of these materials as bare electrodes for flexible supercapacitors was studied in a comparative way. The experiments showed that the electrodes synthetized with the low-cost UV laser compete well in terms of specific capacitance with those obtained with the CO2 laser, while the best performance is provided by the rGO electrodes fabricated with the CO2 laser. It has also been demonstrated that the degree of reduction achieved with the UV laser for the rGO patterns was not enough to provide a good interaction electrode-electrolyte. Finally, we proved that the specific capacitance achieved with the presented supercapacitors can be improved by modifying the in-planar structure, without compromising their performance, which, together with their compatibility with doping-techniques and surface treatments processes, shows the potential of this technology for the fabrication of future high-performance and inexpensive flexible supercapacitors.

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“…Moreover, a peak arising from the C-H stretching vibration at 2876 cm −1 was also present [31,32]. Furthermore, the addition of the PEDOT:PSS intensified the bands associated with the sulfur-containing groups remaining in the GO as a consequence of the H2SO4 oxidizing agent [18]. As it can be seen in Figure 3b, these peaks were located at 1409 cm -1 , 1042 cm −1 , and 1018 cm −1 and were associated with the S=O links [33,34].…”

Section: Structural Propertiesmentioning

confidence: 94%

“…Transparent and flexible films intended for water-based inks with a thickness of 160 µm (from ColorGATE Digital Output Solutions GmbH, Hannover, Germany) were used as substrate for the fabrication of the RH capacitive sensors. GO colloid with a concentration of 4 mg/mL (0.4 wt%) was prepared following a modified version of Hummers and Offerman's method [18]. The PEDOT:PSS dispersion used in this work was obtained from Heraeus Holding GmbH (Hanau, Germany, product name: CLEVIOS™ P VP AI 4083).…”

Section: Methodsmentioning

confidence: 99%

Fabrication and Characterization of Humidity Sensors Based on Graphene Oxide–PEDOT:PSS Composites on a Flexible Substrate

et al. 2020

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In this paper, we present a simple, fast, and cost-effective method for the large-scale fabrication of high-sensitivity humidity sensors on flexible substrates. These sensors consist of a micro screen-printed capacitive structure upon which a sensitive layer is deposited. We studied two different structures and three different sensing materials by modifying the concentration of poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate (PEDOT:PSS) in a graphene oxide (GO) solution. The results show that the aggregation of the PEDOT:PSS to the GO can modify its electrical properties, boosting the performance of the capacitive sensors in terms of both resistive losses and sensitivity to relative humidity (RH) changes. Thus, in an area less than 30 mm2, the GO/PEDOT:PSS-based sensors can achieve a sensitivity much higher (1.22 nF/%RH at 1 kHz) than other similar sensors presented in the literature which, together with their good thermal stability, time response, and performance over bending, demonstrates that the manufacturing approach described in this work paves the way for the mass production of flexible humidity sensors in an inexpensive way.

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Design guidelines of laser reduced graphene oxide conformal thermistor for IoT applications

Cited by 44 publications

References 21 publications

In-Depth Study of Laser Diode Ablation of Kapton Polyimide for Flexible Conductive Substrates

In-Depth Study of Laser Diode Ablation of Kapton Polyimide for Flexible Conductive Substrates

Comparison of Laser-Synthetized Nanographene-Based Electrodes for Flexible Supercapacitors

Fabrication and Characterization of Humidity Sensors Based on Graphene Oxide–PEDOT:PSS Composites on a Flexible Substrate

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