Ruttanapun, Chesta

Preferred name

Ruttanapun, Chesta

Alternative Name

Ruttanapun, C.

Main Affiliation

School of Science

chesta.ru@kmitl.ac.th

Now showing 1 - 10 of 19

Some of the metrics are blocked by your
consent settings
Synthesis of Zn0.96Al0.04O thermoelectric material for fabrication of thermoelectric module and thermoelectric generator
(2018-01-01)
Chanprateep, S.
;
Ruttanapun, C.
The main objective of this work is aim to synthesize Zn<inf>0.96</inf>Al<inf>0.04</inf>O thermoelectric materials for fabricating thermoelectric modules and inventing thermoelectric generator. The Zn<inf>0.96</inf>Al<inf>0.04</inf>O sample was prepared by a conventional solid state reaction method. The formation of structure was proved by X-ray diffraction and the thermoelectric properties were measured. The results presented that the Zn<inf>0.96</inf>Al<inf>0.04</inf>O displayed thermoelectric materials and showed the thermoelectric properties as higher than that of ZnO based. The Zn<inf>0.96</inf>Al<inf>0.04</inf>O thermoelectric modules displayed the electric power was increased with number of module, large temperature difference and operation at high temperature. The Zn<inf>0.96</inf>Al<inf>0.04</inf>O thermoelectric generator showed high performance for electric generator at high temperature. The sixteen Zn<inf>0.96</inf>Al<inf>0.04</inf>O legs thermoelectric generator can generate electric power 1.4 mW at 800 in ΔT = 600 C. Thus, the Zn<inf>0.96</inf>Al<inf>0.04</inf>O thermoelectric material can be used for application of thermoelectric generator at high temperature.
Some of the metrics are blocked by your
consent settings
Reinvestigation thermoelectric properties of CuAlO2
(2014-01-01)
Ruttanapun, Chesta
;
Kosalwat, Wattana
;
Rudradawong, Chalermpol
;
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.
Some of the metrics are blocked by your
consent settings
Optical properties of Cu0.95Pt0.05Fe0.97Sn0.03O2 for p-type transparent conducting oxide materials
(2013-08-30)
Ruttanapun, Chesta
;
Kahatta, Sagulthai
;
Boonchom, Banjong
;
Vittayakorn, Naratip
;
Thongkam, Montree
The Cu<inf>0.95</inf>Pt<inf>0.05</inf>Fe<inf>0.97</inf>Sn<inf>0.03</inf>O<inf>2</inf> sample has been synthesized by a solid-state reaction to investigate optical properties of materials of transparent conducting oxide. Crystal structure was characterized by XRD. The Seebeck coefficient and electrical conductivity were measured in the high temperature (300 to 860 K), while the XPS and UV-VIS-NIR spectra were analyzed at room temperature. The XRD peaks confirm the samples forming the delafossite structure phase. The Seebeck coefficient reveals the samples displays the p-type conducting. The XPS spectra show the Sn2+ state stabling in this compound. The optical direct gap is 3.45 eV as a visible-transparent material. These results support that the Cu<inf>0.95</inf>Pt<inf>0.05</inf>Fe<inf>0.97</inf>Sn<inf>0.03</inf>O<inf>2</inf> oxide compounds, of which the Cu1+ and Fe3+ sites are substituted by the Pt1+ and Sn2+ ions respectively, are p-type transparent conducting oxide materials. © (2013) Trans Tech Publications, Switzerland.
Some of the metrics are blocked by your
consent settings
Optical and electronic transport properties of p-type CuCoO2 transparent conductive oxide
(2013-09-18)
Ruttanapun, Chesta
;
Sa-Nguan-Cheep, Minraya
;
Kahatta, Sagulthai
;
Buranasiri, Prathan
;
Jindajitawat, Phumin
The CuCoO2 sample has been synthesized by a conventional solid-state reaction method to investigate electronic transport and optical properties for p-type transparent conducting oxide materials. The crystal structure was characterized by XRD. The Seebeck coefficient and electrical conductivity were measured in the high temperature. The UV-VIS-NIR and FTIR spectra were analyzed at room temperature. The XRD peaks confirm the samples forming the delafossite structure phase. The Seebeck coefficient sign confirms the samples displays the p-type conducting. The electronic transport energy for activating free carrier production and conduction contain 0.276 eV and 0.131 eV, respectively. The optical direct gap is 3.65 eV which is a visible-transparent oxide material. These results support that the CuCoO2 oxide compound is p-type transparent conducting oxide materials. © 2013 SPIE.
Some of the metrics are blocked by your
consent settings
Method of high active preparation and electrical properties of CuFeO2 delafossite-type
(2014-01-01)
Rudradawong, Chalermpol
;
Wichainchai, Aree
;
Sakulkalavek, Aparporn
;
Hongaromkid, Yuttana
;
Ruttanapun, Chesta
In this paper, the CuFeO<inf>2</inf> compound were prepared by classical solid state reaction (CSSR) and direct powder dissolved solution (DPDS) method from starting material metal oxides and metal powders. Preparation of two methods shows that, direct powder dissolved solution faster recover phases than classical solid state reaction method. The fastest method gets from starting materials Cu and Fe metal powders, the electrical conductivity, Seebeck coefficient, carrier concentration and mobility are 10. 68 S/cm, 244. 59 μV/K, 12. 86×1016 cm-3 and 494. 96 cm2/V. s, respectively. In addition, each CuFeO<inf>2</inf> compounds were investigated on crystal structure and electrical properties. From XRD and SEM results, all samples have a crystal structure delafossitetype (R3m) and a large grain boundary more than 15 μm by electrical conductivity corresponds to grain boundary and lattice parameter: a increases. Within this paper, from above results exhibit that preparation CuFeO<inf>2</inf> from Cu and Fe by direct powder dissolved solution method most appropriate for thermoelectric oxide materials due to high active for preparation else high lattice strain and high power factor are 0. 00052 and 0. 64×10-4 W/mK2, respectively. © (2014) Trans Tech Publications, Switzerland.
Some of the metrics are blocked by your
consent settings
A simple route to synthesize ferromagnetic binary calcium iron pyrophosphate CaFeP2O2 using aqueous-acetone media
(2013-08-30)
Chaiyasith, Pachernchaipat
;
Ruttanapun, Chesta
;
Thongkam, Montree
;
Kongteweelert, Samart
;
Woramongkonchai, Somsak
A binary calcium iron pyrophosphate CaFeP<inf>2</inf>O<inf>7</inf> was synthesized by solid state route using the mixing of calcium carbonate, iron metal and phosphoric acid in aqueous-acetone media at 600°C. The XRD datum indicates the formation of CaFeP<inf>2</inf>O<inf>7</inf> phase without the presence of any phase impurities. FTIR result indicates the presence of the P<inf>2</inf>O<inf>7</inf> 4- anion in the structure. Sheet-like microparticle of CaFeP<inf>2</inf>O<inf>7</inf> was revealed by SEM. Room temperature magnetization result showed ferromagnetic behavior of the synthesized CaFeP<inf>2</inf>O<inf>7</inf>, with saturation-specific magnetization value of 11.067 emu g-1 at 10kOe. The magnetic feature of the synthesized CaFeP<inf>2</inf>O<inf>7</inf> in this work compared with M<inf>2</inf>P<inf>2</inf>O<inf>7</inf> (M = Ca and Fe), its isotypic (CaMP2O7 (M= Mn and Co) and CFeP<inf>2</inf>O<inf>7</inf> (C= Co and Cu) reported in our previous works is important properties for specific applications. © (2013) Trans Tech Publications, Switzerland.
Some of the metrics are blocked by your
consent settings
Enhancing the supercapacitor performance of NiCo2O4 microflowers by reduced graphene oxide nano-sheets
(2021-01-28)
Saei, Worawee
;
Buranasiri, Prathan
;
Karaphun, Attaphol
;
Ruttanapun, Chesta
;
Sriwong, Chaval
This work presented the preparation and supercapacitor performance of a spinel nickel-cobalt oxide (NiCo2O4) microflowers mixed with nano-sized reduced graphene oxide (rGO) sheets. The hybrid material (NiCo2O4/rGO), pure NiCo2O4 and nano-sized rGO samples were characterized and confirmed by several techniques, such as XRD, SEM and EDS. The supercapacitive properties of all prepared samples were also studied using an electrochemical measurement technique (CV and GCD). The results revealed that the NiCo2O4/rGO (484.1 F.g-1) hybrid electrode exhibited much higher specific capacitance than those of pristine NiCo2O4 (358.3 F.g-1) and nano-sized rGO (113.8 F.g-1) electrodes, respectively. Hence, this work indicates that the supercapacitor performance of NiCo2O4 mixed rGO hybrid materials is more superior to the pure NiCo2O4 microflowers and nano-sized rGO sheets.
Some of the metrics are blocked by your
consent settings
Effect of Strong Correlation of Mg2+-doped into Cr3+ Sites of CuCrO2 on Thermoelectric Properties
(2015-09-02)
Ruttanapun, Chesta
;
Charoenphakdee, Anek
;
Nisoa, Mudtorlep
;
Muthitamongkol, Pennapa
;
Thanachayanont, Chanchana
This study aims to investigate the strong correlation effect of spin and charge carriers for the Mg2+-substituted into Cr3+ sites of CuCrO2 delafossite on thermoelectric properties. The CuCr0.98Mg0.02O2 sample was synthesized by a solid state reaction. The starting powder CuO, Cr2O3 and MgO were ball milled with poly vinyl alcohol solution for 24 h. The ball milled powder was pressed and sintered in air atmosphere at temperature 1050 C for 6 h. The crystal structure was characterized by XRD, TGA, XPS and the thermoelectric properties were measured at high temperature. The XRD displayed peaks of the pure phase CuCrO2 structure as hexagonal delafossite-type structure space group: Rm. The Seebeck coefficient of the samples displayed positive sign as p-type (hole) conductor. The XPS results displayed Mg2+, Cu1+, Cr3+ and Cr4+ ion states. The Mg2+ induced mixed-valance Cr3+/Cr4+ states resulting in enhanced Seebeck coefficient due to a strong correlation of the spin-entropy. The experimental results of Seebeck value were close to calculated results by the extended Heikes formula confirming of the strong correlation effect. In addition, the Mg-doped CuCrO2 resulted in increased electrical conductivity and reduced thermal conductivity with increasing temperature. These indicate that the Mg2+-substituted for Cr3+ of CuCrO2 delafossite enhance the thermoelectric properties. © 2015
Some of the metrics are blocked by your
consent settings
Facile, alternative synthesis of spherical-like ca(H2PO4)2•H2O nanoparticle by aqueous-methanol media
(2013-08-30)
Kongteweelert, Samart
;
Ruttanapun, Chesta
;
Thongkam, Montree
;
Chaiyasith, Pachernchaipat
;
Woramongkonchai, Somsak
Spherical-like calcium dihydrogenphosphate monohydrate (Ca(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>•H<inf>2</inf>O) nanostructure was successfully prepared by the mixing of calcium carbonate and phosphoric in aqueous-methanol media at ambient temperature for 30 min. Three thermal decomposition step and higher stability at over 800°C of the prepared sample are different from the earlier works. Spherical-like Ca(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>•H<inf>2</inf>O nanostructure with diameter < 100 nm confirmed by SEM may be important for potential applications. This method of synthesis by aqueous-methanol media is a fast and simple method and it is expected to be applicable for the synthesis of other nanocrystalline calcium phosphates. © (2013) Trans Tech Publications, Switzerland.
Some of the metrics are blocked by your
consent settings
A new synthesis of BaHPO4 precipitated by BaCO3-H4PO4-NaOH system at room temperature
(2013-08-30)
Boonchom, Banjong
;
Ruttanapun, Chesta
;
Thongkam, Montree
;
Chaiyasith, Pachernchaipat
;
Woramongkonchai, Somsak
Barium hydrogenphosphate, BaHPO<inf>4</inf> was synthesized for the first time through simple and rapid method using BaCO<inf>3</inf>-H<inf>3</inf>PO<inf>4</inf>-NaOH, pH =9.0 at room temperature for 30 min. The studied BaHPO<inf>4</inf> decomposed in a single well-defined stage via deprotonated hydrogenphosphate reactions, revealed by TG/DTG and DSC techniques. The calculated wavenumbers based on DSC peak were comparable with FTIR results, which support the breaking bonds of P-OH (HPO<inf>4</inf>2-) in the deprotonated hydrogenphosphate reactions. The thermodynamic functions (ΔH*, ΔG*, and ΔS*) for the deprotonated hydrogenphosphate reactions calculated from DSC data indicate that the deprotonated HPO<inf>4</inf>2- reaction occur a lower-energy pathway and spontaneous process. The FTIR, XRD and SEM data of the studied BaHPO<inf>4</inf> and its decomposed product Ba<inf>4</inf>P<inf>2</inf>O<inf>7</inf> are also reported. © (2013) Trans Tech Publications, Switzerland.

Ruttanapun, Chesta

Filters

Settings

Sort By

Results per page