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Subject: search.filters.subject.Carbon nanoparticles

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    Item type:Publication,
    Synthesis of carbon nanoparticles from used motor oil and benzene via solution plasma process
    (2017-01-01)
    Seangarunthong, Napatsawan
    ;
    Khongthong, Parinya
    ;
    Panomsuwan, Gasidit
    ;
    Ueno, Tomonaga
    ;
    Saito, Nagahiro
    Carbon nanoparticles (CNPs) were successfully synthesized from the mixture of used motor oil and benzene via a solution plasma process (SPP). The synthesis was achieved within a single step at room temperature and atmospheric pressure. The effects of mixing ratio between used motor oil and benzene on the physical and chemical properties of CNPs were investigated by means of field-emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Raman spectroscopy. The results revealed that there were no significant changes in morphological feature and chemical functional groups on CNPs at different mixing ratios. The CNPs exhibited the aggregates of fine particles with the diameter of about 20-30 nm. The crystallinity of CNPs was found to be slightly increased when synthesized under the presence of used motor oil, possibly due to the effect of aliphatic hydrocarbons and polycyclic aromatic hydrocarbons in used motor oil. We expect that the conversion of used motor oil into CNPs by SPP could be another attractive way to add the value to used motor oil prior to disposing.
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    Characterization and photoresponse propreties of sn-doped ZnO thin films
    (2013-01-01)
    Chongsri, Krisana
    ;
    Bangbai, Chatpong
    ;
    Techitdheera, Wicharn
    ;
    Pecharapa, Wisanu
    Sn-doped ZnO (SZO) thin films were prepared by sol-gel spin-coating method based on zinc acetate dihydrate (CH<inf>3</inf>COO)<inf>2</inf> Zn·2H<inf>2</inf>O, Tin (IV) chloride pentahydrate (SnCl <inf>4</inf>5H<inf>2</inf>O), 2-methoxyethanol (C<inf>3</inf>H<inf>8</inf>O <inf>2</inf>) and diethanolamine ((HOCH<inf>2</inf>CH<inf>2</inf>) <inf>2</inf>NH, DEA.The solution was prepared with various Sn doping content in ZnO assigned at 2%, 4%, 6%, 8% and 10%. All films were spin-coated on borosilicate substrates and annealed temperature at 550°C for 4 h in air. The structural properties of the films were characterized by XRD and SEM and the corresponding results indicated the crystalline structure and surface morphology of the films, respectively. UV-VIS transmission spectra was used to determine optical properties of asprepared. The increasing Sn doping content into ZnO films results to the enhancement in transparency of the films and the observable alternation in their grain size. The photoilluminated current linearly increases with increasing bias voltage indicating the good Ohmic contact of the device. The photoresponse of the device has significant improvement with increasing Sn doping content. © 2013 The Authors.