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Author: search.filters.author.Charoensuk, KrittapasSubject: search.filters.subject.Laser-induced graphene

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    Shape memory laser-induced graphene electrode based on polybenzoxazine-co-epoxy coated fabric and its electrochemical sensor application
    (2025-12-01)
    Luengrojanakul, Panuwat
    ;
    Klamchuen, Annop
    ;
    Leepheng, Piyawan
    ;
    Tunhoo, Benchapol
    ;
    Charoensuk, Krittapas
    In this investigation, CO<inf>2</inf> direct laser writing is performed on BA-a/NGDE shape memory polymer matrix coated fabric. Findings show that the quality and surface coverage of formed laser-induced graphene (LIG) are dependent on BA-a content. The LIGs acquired at higher BA-a content possess low sheet resistance (∼10–15 Ω/sq), facilitating its use as joule heater for shape memory actuation (T<inf>avg</inf> ∼130 °C at 20 V for BOZ70-LIG). Furthermore, the fabricated LIG electrode shows potential use as electrochemical sensor with ΔE<inf>p</inf> of 88–200 mV and k<sup>0</sup> of 0.005 cm s<sup>-1</sup> (20 mm length) for 1 mM K<inf>4</inf>[Fe(CN)<inf>6</inf>]/0.1 M KCl. The 40 mm electrode length also maintains respectable electrochemical performance even after subjecting LIG to shape deformation and recovery. Moreover, the molecular imprinted polymer (MIP) modified LIG electrode also exhibits promising results in selective dopamine detection through leucodopaminechrome in PBS with linear detection range of 1.0–15.0 μM and LOD of 0.61 μM.
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    Low resistance bisphenol-A based polybenzoxazine derived laser-induced graphene (LIG) and its microsupercapacitor application
    (2024-11-01)
    Luengrojanakul, Panuwat
    ;
    Klamchuen, Annop
    ;
    Khemasiri, Narathon
    ;
    Chotsuwan, Chuleekorn
    ;
    Charoensuk, Krittapas
    Herein, we demonstrate the use of conventional BA-a based polybenzoxazine as a laser-induced graphene (LIG) forming precursor. The effects of laser power and the engraving speed on formation and properties of LIG are explored. By optimizing the laser fluency related to laser power along with engraving speed, poly(BA-a) derived LIG with high graphitization degree and low sheet resistance (R<inf>s</inf>) of ∼ 2–10 Ω/sq can be acquired. The morphologies and surface area of LIGs in such low R<inf>s</inf> region are then validated through SEM and BET, respectively. The resulting poly(BA-a) derived LIG exhibits a high amount of macropores in the structure with marginal differences in the specific surface area being 27–88 m<sup>2</sup>/g. In addition, electrochemical performances of the two-electrode based microsupercapacitor (LIG-MSC) of the selected samples in low R<inf>s</inf> region with different specific surface area are evaluated. The LIG-MSC shows a specific capacitance of 1.39 mF/cm<sup>2</sup> (0.04 mA/cm<sup>2</sup>), and good cycling stability of 10,000 cycles with capacitance retention of 92% (0.2 mA/cm<sup>2</sup>). Our results highlight that poly(BA-a) derived LIG is promising for high performance LIG applications.