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Access type: UnknownAuthor: search.filters.author.Kingkam, Wilasinee

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    The Y3+ Donor-Doped CCTO (Ca0.95Y0.05Cu3Ti4O12) Dielectric Fillers for Electrical Output Enhancement of Flexible Triboelectric Nanogenerator
    (2026-06-03)
    Saichompoo, Kittipan
    ;
    Rattanawongwiboon, Thitirat
    ;
    Kingkam, Wilasinee
    ;
    Pakawanit, Phakkhananan
    ;
    Sukkha, Usa
    The escalating wearable electronic devices with their flexible energy sources demand has rendered the imperative scientific challenge on the development of materials for the flexible triboelectric nanogenerators (F-TENG), one of advanced energy harvesting systems. Dielectric material optimization, the Y<sup>3+</sup> donor-doped calcium copper titanate based on exactly stoichiometric Ca<inf>0.95</inf>Y<inf>0.05</inf>Cu<inf>3</inf>Ti<inf>4</inf>O<inf>12</inf> (CCTYO), serves as a critical pathway in this work for achieving enhanced F-TENG via compositing with the polydimethylsiloxane (PDMS) polymer. The enhancement of electrical output has garnered substantial interest owing to its increased relative permittivity ((Formula presented.)). The influence of the loaded CCTYO amounts on structure, morphologies, dielectric properties, and electrical output, including open-circuit voltage (V<inf>OC</inf>), short-circuit current (I<inf>SC</inf>) and power density for PDMS/CCTYO composites is investigated. As compared with loading undoped CCTO, the additional Y<sup>3+</sup> can improve higher F-TENG output by increasing the (Formula presented.) along with maintaining the loss tangent (tan δ < 0.02) at optimized condition. The appropriate amounts of CCTYO 0.75 wt% make the PDMS/CCTYO F-TENG to achieve V<inf>OC</inf> of ∼76.4 V (8.5 V/cm<sup>2</sup>) and I<inf>SC</inf> of ∼130.0 μA (14.4 μA/cm<sup>2</sup>), which were higher than pristine PDMS for 2.7 and 4.3 times. The power density of 53 µW/cm<sup>2</sup> is 8.9 times higher than that of 6.3 µW/cm<sup>2</sup> from the pristine PDMS. This study also provides a COMSOL multiphysics simulation, bridging laboratory experiments, for quantifying the triboelectric capability of dielectric materials.
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    Effective rare-earth dielectric addition and gamma ray irradiation for achieving highly efficient PDMS triboelectric nanogenerator
    (2025-02-01)
    Saichompoo, Kittipan
    ;
    Kingkam, Wilasinee
    ;
    Issarapanacheewin, Sudarat
    ;
    Ukasi, Sirinya
    ;
    Pongampai, Satana
    This research aims to develop the flexible triboelectric nanogenerator (TENG) using PDMS polymer as the main tribo-material and composite with dielectric rare earth oxide, lanthanum chromite compound; LaCrO<inf>3</inf>, to enhance generated charge density, before add-on its higher electrical output with gamma ray irradiation. Upon study the effect of different amounts of the loaded LaCrO<inf>3</inf> and various doses of gamma ray, the optimum condition can be obtained. The PDMS/LaCrO<inf>3</inf> at 5 wt% can reach open-circuit voltage (V<inf>OC</inf>) and shot-circuit current (I<inf>SC</inf>) at 89 V and 448 μA. The impressive results of output further appear by additional irradiated gamma radiation. At 150 kGy dose of Irradiated gamma ray, V<inf>OC</inf> and I<inf>SC</inf> can jump to 161 V and 963 μA. These output signals, especially I<inf>SC</inf>, can be ∼34 times higher than that of the pristine PDMS. Scientific discussion regarding characterization, operating mechanism, dielectric properties and electrical output is provided. The practical application of being a small power source is also developed. Therefore, this research can show another useful application of gamma ray in the field of materials design for energy harvesting devices. The knowledge provided in this research can also serve as potential guidance in the field of specific TENG utilization.
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    RARE EARTH OXIDE DIELECTRICS FOR FLEXIBLE TRIBOELECTRIC NANOGENERATOR
    (2025-01-01)
    Kingkam, Wilasinee
    ;
    Issarapanacheewin, Sudarat
    ;
    Ukasi, Sirinya
    ;
    Pulphol, Phieraya
    ;
    Pakawanit, Phakkhananan
    Rare earth oxides (REO) are well known in catalysts, glass-related industries, and permanent magnets manufacturing for almost 70%, according to the mature industry. This work proposes the new developments of REO as the emergence for mechanical energy harvesting (MEH) technology. The binary-system of REO or R<inf>2</inf>O<inf>3</inf>, including La<inf>2</inf>O<inf>3</inf>, Sm<inf>2</inf>O<inf>3</inf> and Nd<inf>2</inf>O<inf>3</inf>, are used as dielectric materials to incorporate polydimethylsiloxane (PDMS) for fabricating flexible triboelectric nanogenerators (TENG), one of MEH devices. The change in REO’s amount was studied at 0.5, 2.5, 5, and 10 wt%. Upon applying mechanical force in vertical direction, the PDMS/R<inf>2</inf>O<inf>3</inf> TENG can convert mechanical energy into electricity for the best value of ~66 V and ~93 μA with power density of about ~62 μW·cm<sup>-2</sup>. The PDMS/La<inf>2</inf>O<inf>3</inf> can be used to fully charge the 0.22 and 0.33 μF capacitor within 3 seconds and power up over 100 LEDs directly. Moreover, the influence of triboelectric polarity and dielectricity on the triboelectric output performance is scientifically discussed by following the percolation point with air breakdown limitation’s theory. The researcher believes that the knowledge of this work will be inexhaustible useful to develop a group of REO in broad applications of MEH electronics in future.