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Author: search.filters.author.Charoonsuk, ThitiratSubject: search.filters.subject.Ag nanoparticles

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    Dielectric Spectroscopy and Electric Modulus Analyses of Ti0.8O2 Nanosheets‒Ag Nanoparticles‒Cellulose Filter Paper Composites
    (2022-01-01)
    Maluangnont, Tosapol
    ;
    Sriphan, Saichon
    ;
    Charoonsuk, Thitirat
    ;
    Vittayakorn, Naratip
    We employ dielectric spectroscopy and the complex electric modulus formalism to characterize electrical properties of the Ti<inf>0.8</inf>O<inf>2</inf> nanosheets‒Ag nanoparticles‒cellulose filter paper composites, intended for use as a triboelectric nanogenerator. The addition of these fillers (5–17 atom% Ti and 1–6 atom% Ag) increases both the dielectric permittivity and AC conductivity while typically keeping the low loss tangent. The observed exponent to the frequency-dependent universal power law indicates the three-dimensional (3D) hopping mechanism in the composited films, contrasting with the 1D- or 2D-conduction in the ceramics. The electrical responses are also distinct from those of sole nanosheets, indicating some filler-matrix interactions. Electric modulus analyses indicate that the Ti<inf>0.8</inf>O<inf>2</inf> nanosheets act as a charge generation/reservoir, while the Ag nanoparticles generate long-range conduction paths. The relaxation time increases with the dielectric nanosheets content but decreases with metallic nanoparticle content. In addition, these co-fillers decrease the dielectric heating but increases the refractive index of the films. The simple analyses reported herein could be applied to other composites, providing a better understanding on the role of diverse functional co-fillers.
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    Multifunctional Nanomaterials Modification of Cellulose Paper for Efficient Triboelectric Nanogenerators
    (2020-05-01)
    Sriphan, Saichon
    ;
    Charoonsuk, Thitirat
    ;
    Maluangnont, Tosapol
    ;
    Pakawanit, Phakkhananan
    ;
    Rojviriya, Catleya
    There is a need to develop inexpensive, lightweight, and flexible high-performance triboelectric nanogenerators (TENGs) from renewable resources. Here, a multifunctional cellulose filter paper (CFP)-based TENG consisting of dielectric Ti<inf>0.8</inf>O<inf>2</inf> nanosheets (Ti<inf>0.8</inf>O<inf>2</inf> NSs) and conducting Ag nanoparticles (Ag NPs) is prepared by a simple dip coating method. The incorporation of dielectric Ti<inf>0.8</inf>O<inf>2</inf> NSs onto the CFP significantly improves charge generation, while the inclusion of Ag NPs provides an electrically conductive path for charge transportation. The presence of these fillers can be deduced from XRD, SEM, EDS, X-ray photoelectron spectroscopy, and Raman spectroscopy. Their distribution is visualized in 3D by synchrotron radiation X-ray tomography. The present CFP-based TENG provides an output voltage and current density of ≈42 V and ≈1 µA cm<sup>−2</sup>, respectively with the power density of ≈25 µW cm<sup>−2</sup>. It is capable of lighting up 40 light-emitting diode bulbs and charging a 0.22 µF capacitor to 8 V in only 5 s. The developed TENG is also capable of detecting simple human motions, i.e., finger tapping, finger rubbing, and foot trampling. This work offers a facile design of low cost yet efficient paper-based TENG by dual modification with multifunctional nanomaterials, and also demonstrates its use as a feasible power source that not only drives small electronics, but also scavenges energy from human actions.
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    High-Performance Hybridized Composited-Based Piezoelectric and Triboelectric Nanogenerators Based on BaTiO3/PDMS Composite Film Modified with Ti0.8O2 Nanosheets and Silver Nanopowders Cofillers
    (2019-05-28)
    Sriphan, Saichon
    ;
    Charoonsuk, Thitirat
    ;
    Maluangnont, Tosapol
    ;
    Vittayakorn, Naratip
    In order to commercialize the rapidly developing technology of energy harvesters, the following devices need to be developed further for enhancing output performance, flexibility, scalability, facile fabrication, and cheaper price. The composite-based triboelectric nanogenerator (CTENG), which contains the above properties, is a promising technology that has attracted special interest for a decade. Focus has been placed on the hybrid concept between the composite-based piezoelectric nanogenerator (CPENG) and CTENG in order to enhance CTENG efficiency. This study presented a high-performance hybridized CPENG and CTENG device, which operated from the composite film of Ti<inf>0.8</inf>O<inf>2</inf> nanosheets (Ti NSs)/silver nanoparticles (Ag NPs) co-doped BaTiO<inf>3</inf> nanopowders (BT NPOs) inside the polydimethylsiloxane (PDMS) host. The 0.3 vol % of Ti NSs and 1.5 vol % of Ag NPs exhibited the optimum harvesting performance in all compositions, with an output voltage and current density reaching approximately 150 V and 0.32 μA/cm<sup>2</sup>, respectively. Their harvesting performance was approximately 60 and 32 times higher than that of the CPENG constructed from pure PDMS. In addition, practical demonstration of the proposed device was investigated. The hybridized CPENG and CTENG device could operate in a long-term cyclic operation, charge the capacitor for storing energy, and also drive LEDs to brighten. This work suggested facile device fabrication and made a guideline to develop high-performance nanogenerators, which is crucial for device development and practical usage in the future.