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MEHRNOUSH KHAVARIAN,SIANG-PIAO CHAI,SOON HUAT TAN,ABDUL RAHMAN MOHAMED 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.3
Multi-walled carbon nanotubes (MWCNTs) were prepared by floating catalyst (FC) method, using methane as a carbon source and iron (III) chloride (FeCl3) as a catalyst precursor, followed by purification with air oxidation and acid treatment. The as-grown and purified MWCNTs were characterized by transmission electron microscopy, scanning electron microscopy, energy dispersive spectroscopy, thermogravimetry analysis and Raman spectroscopy. The average inner and outer diameters of the MWCNTs were 25 and 39 nm, respectively. The purity and yield of the purified MWCNTs were more than 92% and 71% weight fraction, respectively.
MEHRNOUSH KHAVARIAN,SIANG-PIAO CHAI,SOON HUAT TAN,ABDUL RAHMAN MOHAMED 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2009 NANO Vol.4 No.6
Carbon nanotubes (CNTs) were synthesized by a low-cost floating catalyst (FC) chemical vapor deposition (CVD) method in a horizontal reactor. It was found that iron (III) chloride (FeCl3) is a high efficient FC precursor for methane CVD to grow CNTs. In this study, the effects of reaction temperature and flow ratio of methane to nitrogen (CH4:N2) on the morphology of the CNTs were investigated. The morphological analysis by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that increasing the reaction temperature and flow ratio of CH4:N2 grew CNTs of larger diameters. Energy dispersive X-ray (EDX) and thermogravimetric analysis (TGA) were employed to study the purity of the produced CNTs. As shown by the TGA, the highest yield of 74.19% was recorded for the CNTs grown at 1000°C and flow ratio CH4:N2 of 300:200.
Wei-Wen Liu,Siang-Piao Chai,Abdul Rahman Mohamed,U. Hashim 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Carbon nanotubes (CNTs) and graphene have built broad interest in most areas of science and engineering because of their extraordinary physical, mechanical, thermal and optical properties. Graphene is a two-dimensional one-atom-thick planar sheet of sp2-bonded carbon atoms while CNTs are a cylindrical nanostructure which composed entirely of sp2-bonded carbon atoms as well. This review presents and discusses the past and current advancement of synthesis and characterization of graphene and CNTs. The review also concludes with a brief summary and an outlook on the challenges and future prospects in the growth of graphene and CNTs.
Kim-Yang Lee,Wei-Ming Yeoh,Siang-Piao Chai,Satoshi Ichikawa,Abdul Rahman Mohamed 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
Carbon nanotubes (CNTs) were synthesized over a CoO–MoO/Al2O3 catalyst via decomposition of methane in a horizontal quartz tube reactor. The effect of water vapor on the catalytic activity and catalyst lifetime was investigated for the first time in this system. We found that the introduction of an appropriate amount of water vapor (133.3 ppm) into the reaction environment enhanced and sustained the catalytic activity. A continuous supply of a controlled amount of water vapor was found to be optimal for producing CNTs with high crystallinity. The interruption of water vapor supply provoked the formation of an inner cap structure.
Mei Kee Koh,Yee Jie Wong,Siang-Piao Chai,Abdul Rahman Mohamed 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
Copper-based catalysts with different metal-oxide(s) composition were synthesized and applied in CO2 hydrogenation to methanol. The metal component(s) (Cu, Zn and/or Mn) were dispersed on high surface area SBA-15. Correlations between the adsorption properties of catalysts and the catalytic performances reveal that a catalyst with both strong hydrogenation strength and moderate CO2 adsorption strength is crucial for achieving high CO2 conversion. Additionally, the availability of metal-oxide(s) interfacial area greatly enhances methanol selectivity. An adequate balance between H2 and CO2 adsorptions as well as metal-oxide(s) interfacial area were responsible for the high catalytic activity achieved in this study.
Facile preparation of superhydrophobic thin films using non-aligned carbon nanotubes
Goh, Yee-Miin,Han, Kok Deng,Tan, Lling-Lling,Chai, Siang-Piao Techno-Press 2014 Advances in nano research Vol.2 No.4
A simple preparation method on creating superhydrophobic surface using non-aligned carbon nanotubes (CNTs) was demonstrated. Superhydrophobic CNT thin films were prepared by doping a sonicated mixture of CNTs and chloroform onto a glass slide. Water contact angles of the CNT thin films were measured using a contact angle goniometer. The thin films were characterized using laser microscope and scanning electron microscope. Experimental results revealed that the highest average contact angle of $162{\pm}2^{\circ}$ was achieved when the films' thickness was $1.628{\mu}m$. The superhydrophobic surface was stable as the contact angle only receded from $162{\pm}2$ to $157{\pm}2^{\circ}$ after 10 min under normal atmospheric condition.
ABDUL RAHMAN MOHAMED,WEI-WEN LIU,AZIZAN AZIZ,SIANG-PIAO CHAI,CHING-THIAN TYE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2009 NANO Vol.4 No.2
SWCNTs are important materials in manufacturing advanced devices like field effect transistor and field emitters. Fe2O3/MgO catalyst was developed to grow SWCNTs and was used in chemical vapor deposition (CVD) of methane. The catalyst was prepared by mixing iron powder (Fe2O3) with MgO at the prescribed stoichiometry ratio. The findings show that SWCNTs in bundle form were grown over the catalyst. Most of the observed bundles are broad with each bundle constitutes more than 20 individual SWCNTs. Raman analysis indicates that these nanotubes possessed highly graphitized structure. Comparing with other catalyst preparation methods, this approach creates better efficiency in the synthesis and reproducibility of SWCNTs in the methane CVD.