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Author: search.filters.author.Hajra, SugatoSubject: search.filters.subject.triboelectric nanogenerator

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    Synergistic Piezo- and Triboelectricity in a Novel Triglycine Sulfate/Bacterial Cellulose/Chitosan Flexible Composite Nanogenerator
    (2025-08-14)
    Ukasi, Sirinya
    ;
    Saichompoo, Kittipan
    ;
    Sae-tang, Chanachot
    ;
    Pakawanit, Phakkhananan
    ;
    Pongampai, Satana
    Organic piezoelectric materials offer sustainable alternatives for mechanical energy harvesting (MEH), yet their potential remains underexplored compared to inorganic counterparts. This study pioneers the use of triglycine sulfate (TGS), a rarely studied organic piezoelectric, within a flexible three-phase composite with bacterial cellulose (BC) and chitosan (CS) for piezoelectric (PENG) and triboelectric (TENG) nanogenerators. Unlike widely researched systems, TGS's unique hybrid organic–inorganic nature is leveraged here for the first time in MEH. Optimized at a 50:50 BC:CS ratio with 40 wt.% TGS, achieves a TENG output of 141.2 V and 93.3 µA post-poling—1.8 and 2.4 fold higher than unpoled samples—driven by TGS's dipole alignment. Separately, the configuration utilizing a 5 wt.% TGS loading yields 13.7 V and 0.19 µA. Advanced characterization (ATR-FTIR, SR-XTM) and simulations (COMSOL, DFT) reveal TGS's synergy with BC/CS roughness, enhancing charge generation. Delivering 118.65 µW cm<sup>−</sup><sup>2</sup>, the TENG (from the 40 wt.% TGS poled sample) powers a digital watch, showcasing practical promise. This work not only introduces TGS as a novel MEH candidate but also provides mechanistic insights into its polarization, advancing bio-hybrid nanogenerator design.
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    Hybrid Textile Nanogenerators Based on Cotton-PANI/CNT Composites for Simultaneous Harvesting of Mechanical and Thermal Energy
    (2025-06-09)
    Navatragulpisit, Suchanat
    ;
    Saetang, Chanachot
    ;
    Mohsom, Phitchayaphorn
    ;
    Sriphan, Saichon
    ;
    Pakawanit, Phakkhananan
    Rapid advancements in wearable electronics (WEs) have accelerated the development of textile-based triboelectric nanogenerators (T-TENGs) as flexible and sustainable power sources. However, one major challenge lies in mitigating the charge loss due to heat generation during repeated mechanical operations. In this work, we demonstrate a hybrid energy-harvesting textile that integrates both triboelectric and thermoelectric functionalities. Cotton (cot-) fabric serves as the triboelectric substrate, coated with a polyaniline/carbon nanotube (PANI/CNT) thermoelectric composite, enabling the simultaneous harvesting of mechanical and thermal energy. The optimized cot-PANI/CNT device exhibits a high Seebeck coefficient (98.5 mV/K), a power factor of ∼9 μW/mK<sup>2</sup>, and improved electrical conductivity, while maintaining fabric flexibility. The hybrid system achieves an open-circuit voltage (V<inf>OC</inf>) of ∼40.0 V and a short-circuit current (I<inf>SC</inf>) of ∼77.3 μA, yielding a maximum output power of ∼272.3 μW (30.3 μW/cm<sup>2</sup>). The device successfully powers wearable-scale electronics, and mechanistic insights are provided into the synergistic charge generation pathways between the triboelectric and thermoelectric components.
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    Acidic dynamics: Unveiling mechanistic insights for improved performance in chitosan triboelectric nanogenerators
    (2024-07-01)
    Charoonsuk, Thitirat
    ;
    Ukasi, Sirinya
    ;
    Mokthaisong, Panadta
    ;
    Khuntakaew, Pawita
    ;
    Hajra, Sugato
    In recent years, there has been a surge in interest surrounding the development of chitosan (CS)-based triboelectric nanogenerators (TENG) for powering attachable/portable devices. Despite numerous strategies aimed at enhancing their efficiency, the selection of acid solvent has remained largely unexplored. In this study, various acids, including acetic (CH<inf>3</inf>COOH), succinic (C<inf>4</inf>H<inf>6</inf>O<inf>4</inf>), and citric (C<inf>6</inf>H<inf>8</inf>O<inf>7</inf>) acids, were investigated for their impact on mechanical and electrical output signals. Remarkably, the choice and concentration of acid were found to significantly influence performance. Specifically, employing citric acid rendered the CS solid film more pliable and yielded the highest output signal at optimal concentration levels. Under optimized conditions, the CS-TENG exhibited an open-circuit voltage output (V<inf>OC</inf>) of 157 V and short-circuit current output (I<inf>SC</inf>) of 53 µA—more than triple that of pristine CS-TENG. Mechanistic insights into electrical generation have been elucidated, underscoring the importance of solvent selection in CS TENG fabrication. These findings underscore the potential for tailored acid solvent selection to advance specialized applications in the field.