Ruttanapun, Chesta

Preferred name

Ruttanapun, Chesta

Alternative Name

Ruttanapun, C.

Main Affiliation

School of Science

chesta.ru@kmitl.ac.th

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P-Type optoelectronic and transparent conducting oxide properties of delafossite CuAl1/2Fe1/2O2
(2015-12-03)
Ruttanapun, Chesta
;
Jindajitawat, Phumin
;
Buranasiri, Prathan
;
Harnwunggmoung, Adul
;
Charoenphakdee, Anek
CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> delafossite was prepared using a solid-state reaction method to investigate its optical and electronic transport properties. CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> formed a hexagonal delafossite structure with an R3¯m space group. The positive Seebeck coefficient and the direct optical gap of 3.6 eV confirmed that the CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> delafossite in a p-type transparent conducting oxide. The fluorescence emission at 390 nm (green emission) confirmed that CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> has a direct transition band gap. Thermogravimetric analysis indicated a weight loss of 1.2%, caused by the intercalation of O atoms, which produced hole carriers from the different ionic radii at the B sites. The electric conductivity at room temperature was thermally activated, as predicted by the small-polaron hopping mechanism, with an activation energy of 75 meV and a charge transport energy of 61 meV. CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> delafossite exhibited p-type optoelectronic behavior and is a transparent conducting oxide, which may be crucial in the p-type photonic and electrode industries.
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Reinvestigation thermoelectric properties of CuAlO2
(2014-01-01)
Ruttanapun, Chesta
;
Kosalwat, Wattana
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Rudradawong, Chalermpol
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Jindajitawat, Phumin
;
Buranasiri, Prathan
Bulk CuAlO2 delafossite has been synthesized by solid state reaction to reinvestigate the thermoelectric properties. The electrical conductivity, Seebeck coefficient and thermal conductivity were measured in a high temperature range of 300 to 960 K. The result of positive sign of Seebeck coefficient confirms p-type nature of CuAlO2 compund. The results of bulk sample for Seebeck coefficient, the electrical conductivity and thermal conductivity are range of 900 to 300 μV/K, of 0.01 to 2 S/cm, and of 3.5 W/mK to 1.5 W/mK. The maximum ZT value of bulk sample is 0.017 at a 960 K. These results can be concluded that the bulk CuAlO2 by solid state state displays thermoelelctric material.
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Preparation, characterization and finite element computation of Cu(Al 1/2Fe1/2)O2 Delafossite-oxide themoelectric generator module
(2014-09-02)
Ruttanapun, Chesta
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Jindajitawat, Phumin
;
Buranasiri, Prathan
;
Naenkieng, Daengdesh
;
Boonyopakorn, Narongchai
The CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> delafossite oxide has been synthesized by solid state reaction method for studying thermoelectric properties and measuring thermoelectric generator output electric power. The Finite Element technique was used to compute the output voltage of thermoelectric generator in applying temperature difference on a single bar and a module model with compared to the measurement results. The measurement results of positive sign Seebeck coefficient confirm the p-type conductor of the sample. The properties of Seebeck coefficient, electrical conductivity, and thermal conductivity are range from 260 to 310V/K, from 7 to16 S/cm and from 2.5 to 3.5 W/cm-K,respectively, in the temperature range of 300 to 960 K. The output voltage of the single bar in dimension 4.2 × 2.5 × 20 mm 3 obtained 0.5 to 3 mV on applying temperature difference from 1 to 10 K closely to the Finite Element result. The computing results of the thermoelectric single bar and module in high temperature reveal the output electric voltage of CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> oxide raises with the temperature and the number of thermoelectric leg increase. In important results, the high value of electric voltage is obtained 0.2 and 0.4 V for the single bar and the module at 950 K. © 2014 Taylor & Francis Group, LLC.
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Synthesis and thermoelectric properties of Cu0.95Pt 0.05Fe0.97Sn 0.03O2 delafossite-oxide
(2013-01-01)
Ruttanapun, Chesta
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Boonchom, Banjong
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Vittayakorn, Naratip
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Harnwunggmoung, Adul
;
Charoenphakdee, Anek
The Cu<inf>0.95</inf>Pt<inf>0.05</inf>Fe<inf>0.97</inf>Sn0.0 <inf>3</inf>O<inf>2</inf> delafossite sample, which is the simultaneous substitution of the Pt for Cu sites and the Sn for Fe sites of CuFeO<inf>2</inf> delafossite, has been investigated the simultaneous effect on electrical conductivity and Seebeck Coefficient for thermoelectric materials due to the previous reports of Cu<inf>0.95</inf>Pt<inf>0.05</inf>FeO<inf>2</inf> compound displaying high enhancement effect of electric conductivity and the CuFe <inf>0.97</inf>Sn0.0<inf>3</inf>O<inf>2</inf> exhibiting large increasing of Seebeck coefficient. The sample of Cu<inf>0.95</inf>Pt<inf>0.05</inf>Fe <inf>0.97</inf>Sn0.0<inf>3</inf>O<inf>2</inf> was synthesized by solid state reaction method. The crystal structure was characterized by XRD, and the valency oxidation state of the sample was evaluated by XPS. The electrical conductivity, Seebeck coefficient, and thermoelectric conductivity were measured in the high temperature range of 320 to 860 K. The measurement results show that, the sign of Seebeck value and result of XPS reveal the sample displaying p-type thermoelectric materials as confirming the simultaneous Pt and Sn-substituted contributing hole carrier. For the effect of simultaneous substitution, the Seebeck coefficient is enhanced in temperature lower than 650 K, while electrical conductivity displays small value in all temperature range. In surprising value, the thermal conductivity of the sample is smallest value in all temperature range. Totally, the ZT value of sample is obtained 0.07 at 860K as higher than that of the reference-based. This experiment confirms that the simultaneous Pt-doped and Sn-doped of Cu<inf>0.95</inf>Pt<inf>0.05</inf>Fe <inf>0.97</inf>Sn0.0<inf>3</inf>O<inf>2</inf> compound show high ZT value in temperature higher than 700 K. © 2013 Copyright Taylor and Francis Group, LLC.
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High temperature thermoelectric properties of delafossite CuBO2
(2014-01-01)
Ruttanapun, Chesta
;
Jindajitawat, Phumin
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Buranasiri, Prathan
;
Thowladda, Warawoot
;
Neeyakorn, Worakarn
CuBO<inf>2</inf> is prepared by a solid-state reaction method to investigate thermoelectric properties in high temperature. The XRD result confirms the CuBO<inf>2</inf> compound existing in this method. The Seebeck reveals the compound displays p-type thermoelectric material. The experimental results of electrical resistivity exhibited results of 0.004 S/cm to 0.038 S/cm with the temperature range of 650 to 830 K. The Seebeck value is in the range of 450 μV/K to 950 μV/K, and the thermal conductivity is in the range of 1.4 × 10-5 to 5.3 × 10-5 W/m-K2 with the same temperature. The maximum PF and ZT is 5.3 × 10-5 W/m-K2 and 0.0016, respectively, at 960 K. This work demonstrates that the CuBO<inf>2</inf> delafossite-oxide compound displays the p-type thermoelectric materials. © 2014 IEEE.
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Preface
(2021-09-20)
Thammavintorn, Preecha
;
Limkaisang, Viroj
;
Charoenprakdee, Anek
;
Seetawan, Tosawat
;
Kimura, Kaoru

Ruttanapun, Chesta

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