Laser-Induced Biochar Formation through 355 nm Pulsed Laser Irradiation of Wood, and Application to Eco-Friendly pH Sensors

Jeong, Sung‐Yeob; Lee, Chan‐Woo; Lee, Jun-Uk; Ma, Yong-Won; Shin, Bo Sung

doi:10.3390/nano10101904

Cited by 19 publications

(7 citation statements)

References 39 publications

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“…The thermogravimetric analysis (TGA) results suggest a change in weight of the sample according to the temperature change and show the thermal stability of the sample and the composition ratio of the materials (Figure 4e). In general, a weight loss at approximately 100 • C is caused by the evaporation of moisture from the sample [53,54]. Water molecules that are easily decomposed by heat exist as hydrogen bonds between the epoxy group and the hydroxyl group, and the weight loss that occurs at 100-400 • C can be associated with the removal of oxygen-containing functional groups.…”

Section: Chemical Characterizationmentioning

confidence: 99%

Laser-Induced Graphene Heater Pad for De-Icing

Lee

Cho

et al. 2021

Nanomaterials

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The replacement of electro-thermal material in heaters with lighter and easy-to-process materials has been extensively studied. In this study, we demonstrate that laser-induced graphene (LIG) patterns could be a good candidate for the electro-thermal pad. We fabricated LIG heaters with various thermal patterns on the commercial polyimide films according to laser scanning speed using an ultraviolet pulsed laser. We adopted laser direct writing (LDW) to irradiate on the substrates with computer-aided 2D CAD circuit data under ambient conditions. Our highly conductive and flexible heater was investigated by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, X-ray diffraction, and Brunauer–Emmett–Teller. The influence of laser scanning speed was evaluated for electrical properties, thermal performance, and durability. Our LIG heater showed promising characteristics such as high porosity, light weight, and small thickness. Furthermore, they demonstrated a rapid response time, reaching equilibrium in less than 3 s, and achieved temperatures up to 190 °C using relatively low DC voltages of approximately 10 V. Our LIG heater can be utilized for human wearable thermal pads and ice protection for industrial applications.

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Section: Chemical Characterizationmentioning

confidence: 99%

Laser-Induced Graphene Heater Pad for De-Icing

Lee

Cho

et al. 2021

Nanomaterials

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“…Graphene induced on the wood can be used to PH meters and heat switches. 5,6 In this paper, we report a fabrication method of graphene and its micro-nano structure on wood surface by using fs laser micro-processing, which does not require complex environmental and process. The Raman spectrum of induced graphene shows obvious D, G and 2D characteristic peaks, among which 2D peaks are very sharp, indicating that the quality of induced graphene is quite good.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser-induced graphene

Liu

Guo²,

Hu³

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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Femtosecond(fs) laser-induced micro-nano structures on metal and semiconductor surfaces have been extensively studied. However, one-step fs laser-induced graphene (LIG) on wood surface is a research hotspot in recent years. The conversion of wood to graphene takes two steps: the wood is carbonized by a pre-pulse of fs laser radiation, and the carbonized wood is further converted into graphene by a subsequent pulse of fs laser radiation. Traditional high-power continuous wavelength laser can only rely on the accumulation of thermal effect to achieve the carbonization of wood, and wood cannot be further converted into graphene. Fs laser induced graphene is related to the repetition rate of fs laser. Studies show that graphene can be induced at a certain laser power and at any scanning speed when the repetition rate reaches 500 kHz. The main difference is the quality of graphene. Interestingly, the ability of fs lasers to induce graphene in wood is also related to the material composition of induced the wood itself. Because wood is rich in lignin, and the aromatic molecules in lignin are induced into graphene by fs laser. Therefore, lignin-rich materials such as wood, coconut shells and paper, can be induced to produce graphene by fs laser. In this paper, a fs laser with a central wavelength of 355 nm and a repetition rate of 500 kHz was used to successfully induce graphene on wood. The G, D and 2D peaks were observed by Raman spectroscopy. Graphene induced on the wood can be used to PH meters and heat switches.

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“…Carvalho et al presented a sensitive strain sensor utilizing LIG produced by UV irradiation [ 49 ]. Shin’s group also investigated the characteristics of LIG fabricated using a 355-nm UV pulsed laser and applied to physical and electrochemical sensors [ 50 , 51 , 52 ]. LIG has been proven through recent research that a significant number of both pentagonal and heptangular carbon rings are formed in the structure by laser irradiation on the polymer, forming a three-dimensional carbon structure in which carbon rings are entangled [ 53 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Skin-Conformal Laser-Induced Graphene-Based Human Motion Monitoring Sensor

et al. 2021

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Bio-compatible strain sensors based on elastomeric conductive polymer composites play pivotal roles in human monitoring devices. However, fabricating highly sensitive and skin-like (flexible and stretchable) strain sensors with broad working range is still an enormous challenge. Herein, we report on a novel fabrication technology for building elastomeric conductive skin-like composite by mixing polymer solutions. Our e-skin substrates were fabricated according to the weight of polydimethylsiloxane (PDMS) and photosensitive polyimide (PSPI) solutions, which could control substrate color. An e-skin and 3-D flexible strain sensor was developed with the formation of laser induced graphene (LIG) on the skin-like substrates. For a one-step process, Laser direct writing (LDW) was employed to construct superior durable LIG/PDMS/PSPI composites with a closed-pore porous structure. Graphene sheets of LIG coated on the closed-porous structure constitute a deformable conductive path. The LIG integrated with the closed-porous structure intensifies the deformation of the conductive network when tensile strain is applied, which enhances the sensitivity. Our sensor can efficiently monitor not only energetic human motions but also subtle oscillation and physiological signals for intelligent sound sensing. The skin-like strain sensor showed a perfect combination of ultrawide sensing range (120% strain), large sensitivity (gauge factor of ~380), short response time (90 ms) and recovery time (140 ms), as well as superior stability. Our sensor has great potential for innovative applications in wearable health-monitoring devices, robot tactile systems, and human–machine interface systems.

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Laser-Induced Biochar Formation through 355 nm Pulsed Laser Irradiation of Wood, and Application to Eco-Friendly pH Sensors

Cited by 19 publications

References 39 publications

Laser-Induced Graphene Heater Pad for De-Icing

Laser-Induced Graphene Heater Pad for De-Icing

Femtosecond laser-induced graphene

Highly Skin-Conformal Laser-Induced Graphene-Based Human Motion Monitoring Sensor

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