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Sb/F-codoped SnO2 nanofibers synthesized by electrospinning
(2016-12-01)
Santibenchakul, Somtop
;
Chaiyasith, Suwan
;
Pecharapa, Wisanu
In this present work, metal and non-metal doping in tin oxide nanofibers was fabricated by electrospinning technique. Sb/F co-doped SnO<inf>2</inf> nanofibers was synthesized by using polyvinylpyrrolidone as polymer precursor and SnCl<inf>4</inf>·5H<inf>2</inf>O, SbCl<inf>3</inf>, NH<inf>4</inf>F as tin, antimony and fluorine source, respectively. The concentration of polyvinylpyrrolidone and stannic chloride dissolved with mixture solvent of Dimethylformamide and absolute Ethanol were fixed at 8 and 10%w/w and used as staring precursors. Electrospinning process was carried out at 10 kV of applied voltage by maintaining tip to collector distance of 10 cm and the feeding speed of mixed precursor was controlled at 0.5 ml/h. The as-spun nanofibers mats were calcined in air at 600°C for 3 hours to obtain the doped-SnO<inf>2</inf> nanofibers. Thermogravimetric and X-ray diffraction results support that the optimized calcined temperature to remove polyvinylpyrrolidone template and oxidize Sn precursor is 600°C. The morphologies of Sb/F co-doped SnO<inf>2</inf> nanofibers appear in rough surface with rearrangement of Sb/F doped SnO<inf>2</inf> porous nanobeads. The average diameter of Sb/F doped SnO<inf>2</inf> nanofibers is 422 nm with the crystallite size about 22 nm. Fourier-transform infrared and energy-dispersive X-ray spectroscopy results indicate states of transformation of starting precusors to the formation of Sb/F doped SnO<inf>2</inf> nanofibers.
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PVP-assisted Sb-doped SnO2 nanofibers synthesized by electrospinning process
(2016-01-01)
Santibenchakul, Somtop
;
Chaiyasith, Suwan
;
Pecharapa, Wisanu
Well-defined Sb-doped tin oxide (ATO) nanofibers were synthesized by electrospinning technique. Polyvinylpyrrolidone (PVP), SnCl<inf>4</inf>·;5H<inf>2</inf>O and SbCl<inf>3</inf> were chosen as suitable precursors for preparing ATO nanofibers. All of precursors were homogeneously dissolved with the mixture solvent of dimethylformamide (DMF) and absolute ethanol. Electrospinning process was carried out at applied voltage of 10 kV and distance between needle tip to aluminium foil collector was fixed at 10 cm. The injection rate of precursor solution was controlled at 0.5 ml/hr. The as-spun nanofibers were calcined at 600°C with heating rate of 5 °C/min in order to remove the PVP template and improve the crystallinity of ATO structure. Effect of Sb doping concentration on their crystal structure was investigated. The morphology and crystal structure of the electrospun fibers were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). In this work, the obtained ATO nanofibers had average range diameter from 150 to 350 nm with rough surface. Sb doping concentration in ATO nanofibers plays a key role on their network morphology. The excellent doping concentration of Sb that offered the continuous fibrous and porous ATO nanofibers was 7%.
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Effect of calcinations temperature on structural properties, phase transformation and photocatalytic activity of electrospun TiO2 nanofibers
(2013-10-29)
Suphankij, Sineenart
;
Mekprasart, Wanichaya
;
Pecharapa, Wisanu
TiO<inf>2</inf> nanofibers were fabricated via an electrospinning method. Titanium (IV) isopropoxide (TIP) and poly (viny pyrrolidone) (PVP) were used as a starting precursor. The electrospun TiO<inf>2</inf> nanofibers were obtained by injecting the precursor through a needle under a strong electrical field. As-spun fibers were calcined at 500, 600, 700, 800 and 900 °C for 2 h. The structural of properties of the nanofibers were characterized using X-ray diffraction (XRD) and Scanning electron microscope (SEM). XRD results indicated that the crystallinity of TiO<inf>2</inf> nanofibers corresponds to rutile and anatase phase of TiO<inf>2</inf> depending on calcinations temperature. SEM results indicated that the surface morphology and size TiO<inf>2</inf> nanofibers. The photocatalytic degradation of RhB may be attributed to significant absorption enhancement in visible region by phase transformation of TiO<inf>2</inf> nanofibers and fiber size dependence active surface areas. © (2013) Trans Tech Publications, Switzerland.
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Photocatalytic of N-doped TiO2 nanofibers prepared by electrospinning
(2013-01-01)
Suphankij, Sineenart
;
Mekprasart, Wanichaya
;
Pecharapa, Wisanu
Nitrogen-doped TiO<inf>2</inf> nanofibers were prepared by electrospinning process using ammonium acetate (CH3COONH4) as nitrogen sources and titanium (IV) isopropoxide (TiP) in 2-methoxyethanol as starting precursor. The different amount of nitrogen in TiO<inf>2</inf> was introduced into the fibers. The structural properties of nitrogen-doped TiO<inf>2</inf> nanofibers were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and X-ray photoelectron spectroscopy (XPS). XRD results indicated that the crystallinity of as-prepared fibers and after calcined corresponds to phase of TiO<inf>2</inf> independent on nitrogen content. XPS indicates that nitrogen was doped effectively into the fibers. Nitrogen-doped TiO<inf>2</inf> nanofiber materials were utilized as the photocatalyst in dye photodegradation under visible light. The significant absorption enhancement in visible region was obtained by nitrogen-doped TiO<inf>2</inf> nanofibers relating to the improvement of photocatalytic efficiency comparing to undoped-TiO<inf>2</inf>. © 2013 The Authors.

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