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Author: search.filters.author.Chindaduang, A.

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    Theoretical investigation of rhodamine6g derivative as fluorescence metal ion sensor
    (2014-07-24)
    Puingam, R.
    ;
    Chindaduang, A.
    ;
    Tumcharern, G.
    ;
    Sae-Tang Phromyothin, D.
    ;
    Pratontep, S.
    The structural, energetic and optical properties of a Rhodamine6G derivative as the fluoroionphore for metal ion detection, particularly mercury, have been investigated using the time-dependent density functional theory (TD-DFT), compared to experiments. The TD-DFT calculations with the B3LYP method were conducted in the absence and the presence of metal ions. The results indicate that the absorption peaks of the pristine molecules are located at 236 and 282 nm, whereas the selective Hg<sup>2+</sup> binding peaks emerge at 263, 371 and 551 nm. A distinctive new band emerges around 550 nm, in accordance with the experiments, attributed to the metal-to-ionophore electron transfer. © 2014 Taylor & Francis Group, LLC.
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    Composite polymer electrolyte for dye-sensitized solar cells: Role of multi-walled carbon nanotubes
    (2010-02-05)
    Chindaduang, A.
    ;
    Duangkaew, P.
    ;
    Pratontep, S.
    ;
    Tumcharern, G.
    We focus on the energy conversion improvement of dye-sensitized solar cells by using poly(ethylene oxide)-multi-walled carbon nanotube (PEO-MWCNT) electrolyte. Compared with the MWCNT-free solar cells, the addition of 0.05 wt.% MWCNTs in the polymer electrolyte results in a dramatic increase of the short-circuit current (J<inf>sc</inf>), consequently raising the device performance by approximately 9% under a direct light of the Air Mass 1.5 irradiation at 100 mW cm<sup>-2</sup>. The role of the conductive carbon materials in the polymer electrolyte have been investigated by means of ionic conductometry, electrochemical impedance spectroscopy and UV-visible spectroscopy. This work demonstrates that MWCNT additives in polymer electrolytes is a convenient yet effective strategy for improving the performance of photovoltaic devices. © (2010) Trans Tech Publications.