Somdock, Nuttakrit

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Somdock, Nuttakrit
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Email
nuttakrit.so@kmitl.ac.th

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    Item type:Publication,
    Contact Angle Measurement of Melting SnAgCu Solder Paste Mix with Carbon Allotropes Using In-Line Digital Holography Technique
    (2021-01-01)
    Mamart, Wikatsama
    ;
    Somdock, Nuttakrit
    ;
    Boonsri, Chantira
    ;
    Plaipichit, Suwan
    ;
    Buranasiri, Prathan
    In this research we investigated the contact angle of commercial SnAgCu solder paste mixing with some carbon allotropes such as graphite, graphene quantum dots, and fullerene of varying concentrations with melting temperature, wettability, interfacial microstructure. The wettability was assessed in terms of the contact angle. The in-line digital holography was used for determining the contact angle and morphological of samples at each temperature which the samples have been heating from room temperature until the melting temperature. In the experiment, only one beam was used as the object and reference beams which recorded by a CMOS camera. The recorded image was reconstructed by the angular spectrum digital holography numerical programing. Using the reconstructed images of our results, the shape and contact angle of solder pastes can be investigated.
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    Item type:Publication,
    Graphene addition improved figure of merit in SnTe prepared by the rapid hybrid microwave solid-state method
    (2022-02-01)
    Gobpant, Jakrit
    ;
    Somdock, Nuttakrit
    ;
    Limsuwan, Pichet
    ;
    Sakulkalavek, Aparporn
    ;
    Sakdanuphab, Rachsak
    We successfully synthesised SnTe-based powders (SnTe, Sn<inf>0.95</inf>Bi<inf>0.05</inf>Te, and SnTe with graphene addition) by a hybrid microwave solid-state method. This demonstrated comparable thermoelectric performance to the conventional heating method but had low energy consumption and rapid synthesis. Graphene addition to SnTe materials resulted in significant reduction of thermal conductivity. The SnTe with 5 wt% graphene exhibited a reduction in overall thermal conductivity from ∼10 W m<sup>−1</sup> K<sup>−1</sup> for SnTe to ∼2 W m<sup>−1</sup> K<sup>−1</sup> at 325 K and showed a moderate power factor. The Debye model was used to explain the origin of the effects of graphene on lattice thermal conductivity. The dimensionless figure of merit was increased by five times, from 0.07 for SnTe to 0.35 for SnTe with 5 wt% graphene. Our results demonstrated an effective method and additive material to synthesise and enhance the thermoelectric properties of SnTe materials.