Jirapat Pakchamsai1, Cheewapon Chookiat1, Konrat Kerdnawee2,

Thantorn Vanavanichkul2, Jirarat Kaewngam2, Weerawut Chaiwat3, Hajime Tamon4, Noriaki Sano4 and Tawatchai Charinpanitkul2

1 International School of Engineering, Faculty of Engineering, Chulalongkorn University Bangkok, THAILAND

2 Center of Excellence in Particle Technology, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, THAILAND

3 Environmental Engineering and Disaster Management Program, Mahidol University, Kanchanaburi Campus, Sai Yok 71150, Kanchanaburi, Thailand

4 Separation Engineering Laboratory, Department of Chemical Engineering,

Faculty of Engineering, Kyoto University, Kyoto, JAPAN

EFFECT OF CO-EXISTENCE OF Au AND Fe

NANOPARTICLES IN METAL-SWCNH COMPOSITE

SYNTHESIZED BY ARC-DISCHARGE IN WATER METHOD

Introduction

Among those nanomaterials, single-walled carbon nanohorns (SWCNHs) are a

member of carbon nanomaterials which possess unique structures which again

motivate scientists and researchers to conduct many challenging investigations [1].

SWCNHs have surface area and chemical stability superior to other carbon

nanostructures. In addition, several promising applications could be expected when

SWCNHs are combined with some metal nanoparticles [2]. There are many

approaches proposed by various research teams to produce SWCNHs. For

instance, gas-injected arc-in-water method (GI-AIW) is a simple method which can

produce SWCNHs with high purity [1,3]. So far, some previous works have focused

on experiments of SWCNH synthesis with effect of various metals which could be

simply hybridized with SWCNHs [4]. Sano et al. reports that incorporation of gold

nanoparticles would exert significant effect on particle size distribution of Au-

SWCNH hybridized composite when compared with previous investigation on

hybridization of SWCNHs with Fe [2,5]. However, combined effect of co-existence

of Fe and Au within SWCNHs has not been clearly investigated. Therefore, this

work sets its aim on examining effect of Au and Fe nanoparticles which co-existed

in metal-SWCNH composites synthesized by arc-discharge in water method.

Acknowledgements

This work is supported by the Centennial fund of Chulalongkorn University

to Center of Excellence in Particle Technology (CEPT).

Preliminary Results

References

[1] Noriaki,S., J. Phys D: Appl. Phys, 37 (8), 17-20 (2014)

[2] Noriaki, S. et al., Ind. Eng. Chem. Res, 53, 4732-4738 (2014)

[3] Chantamanee, P. et al., Green. Chem. Adv. Article, 18 (2014)

[4] Noriaki, S., Yuu, K., Tatsuhiro, S., J. Mater. Chem, 18, 1555-1560 (2008)

[5] Chantamanee, P. et al., Carbon, 49 (14), 4920 – 4927 (2011)

[6] Andrault, D. et al., Phys. Earth Planet. Inter., 174, 181–191(2009)

[7] Young, R. (1995). The Rietveld Method. Oxford: Oxford Science Publication

Experimental

Future Works

TEM images of pristine Fe-CNHs, (b) TEM images of Au-Fe-CNHs using 0.3 mm Fe wire, (c)

TEM images of Au-Fe-CNHs using 0.5 mm Fe wire, and (d) TEM images of Au-Fe-CNHs using

0.8 mm Fe wire

Further investigation on the performance of such metal-SWCNH

hybridized material on removal of antibiotic pollutants would be

conducted and reported in the future.

IT COULD BE OBSERVED THAT PHYSICAL AND ATOMIC PROPERTIES OF METAL-SWCNH HYBRIDIZED MATERIAL COULD BE

AFFECTED BY INITIAL LOADING OF FE AND AU WIRES INSERTED INTO GRAPHITIC ANODE. IMAGE ANALYSIS OF TEMMICROGRAPHS REVEALS THAT NOMINAL SIZE OF FE NANOPARTICLES EMBEDDED IN SWCNHS BECOME SMALLER WHEN AUWAS INTRODUCED. MEANWHILE THE ATOMIC RATIO OF AU IN METAL ALLOY EMBEDDED IN SWCNHS BECAME HIGHER

WITH AN INCREASE IN THE WEIGHT RATIO OF AU TO FE.• Synthesis by gas-injected arc-in-water method

•Summary of experimental condition

XRD patterns of pristine CNH, Fe-powder, Au-powder, and Au-Fe-SWCNHs with various

size of Fe wire of 0.3, 0.5, 0.6, and 0.8 mm.

Single-Walled Carbon NanoHorns (SWCNHs)

Ref : N. Sano et al.

Distilled Water 3000mL

Graphite Rod (Anode) Diameter(Ø) 6.15mm, Length(L)

76mm (with 2mm Ø hole)

Graphite Rod (Cathode) Diameter(Ø) 20mm, Length(L) 55mm

(with upper four 2mm Ø holes and

lower 10mm Ø hole)

Power Supply Discharge Current 100A

Velocity of Lower Electrode 1.5mm/s

Distance of Lower Electrode 67mm

Time of Reaction 30s

Nitrogen Gas Flow Rate 10L/min

Voltage 30volt

(a)

50 nm

50 nm

(d)

50 nm

(c)

50 nm

(b)

Dependence of average size of Fe

nanoparticles on diameter of iron wire

Effect of weight ratio of Au wire on

average particle size