Ying Wen
National University of Singapore
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Ying Wen.
Carbon | 2002
Wei De Zhang; Ying Wen; Shao Min Liu; Wuiwui Chauhari Tjiu; Guo Qin Xu; L. M. Gan
Without plasma aid, we have successfully synthesized vertically aligned carbon nanotubes (CNTs) on iron-, cobalt- or nickel-deposited quartz plates by chemical vapor deposition with ethylenediamine as a precursor. The amine serves as both etching reagent for the formation of metal nanoparticles and carbon source for the growth of aligned carbon nanotubes. The carbon nanotubes were vertically aligned in high density on a large area of the plain silica substrates. The density and diameter of CNTs is determined by the thickness of the deposited metal film and the length of the tubes can be controlled by varying the reaction time. High-resolution transmission electron microscopy analysis reveals that the synthesized CNTs are multiwalled with a bamboo-like structure. Energy dispersive X-ray spectra demonstrate that the CNTs are formed as tip growths. Raman spectrum provides definite evidence that the prepared CNTs are multiwalled graphitic structure.
Thin Solid Films | 2002
Wei De Zhang; Ying Wen; Jun Li; Guo Qin Xu; L. M. Gan
Well-aligned carbon nanotubes (CNTs) have been grown on nickel-deposited silicon wafers by thermal chemical vapor deposition (CVD) of ethylenediamine precursor. The CNTs are vertically aligned at high density over large areas on the silicon surface. The size and the density of the nanotubes were found to be dependent on the thickness of the Ni film. The length of the nanotube array can be controlled by varying the CVD time. High-resolution transmission electron microscopy analysis revealed that the CNTs present bamboo-like multi-walled structure.
Nanotechnology | 2006
Jianshan Ye; Ying Wen; Wei-De Zhang; Hui-Fang Cui; Guo Qin Xu; Fwu-Shan Sheu
The modification of inorganic polymeric oxides at the surface of carbon nanotubes is of paramount importance for developing new sensors. In this study, molybdenum oxide (MoOx) film was electrodeposited on the surface of multi-walled carbon nanotubes (MWNTs) by cycling the potential between +0.20 and ?0.80?V (versus 3?M KCl?Ag|AgCl) in Na2MoO4 solution. The MoOx-modified nanotube (MoOx/MWNT) electrode displays well-defined redox transitions in 5?mM H2SO4 or in phosphate buffer solution (PBS), which can be attributed to the reductive formation and the re-oxidation of hydrogen molybdenum oxides. X-ray photoelectron spectra (XPS) showed that the deposited MoOx films are mainly Mo6+ complexes. Both MWNT and MoOx/MWNT electrodes have ideal reversibility in 5?mM K3[Fe(CN)6] in 1?M KCl as supporting electrolytes at all sweep rates (0.02?1.00?V?s?1) by cyclic voltammetry. The negatively charged surface of MoOx/MWNTs can further attract molecular cations such as Ru(NH3)63+. The MoOx/MWNT electrode exhibited electrocatalytic ability towards the reduction of bromate due to high surface area and the fast electron transfer rate of nanotubes. Thus, electrochemical modification of inorganic polymeric oxides on the carbon nanotube provides a simple method for the preparation of novel sensors.
Electrochemistry Communications | 2004
Jianshan Ye; Ying Wen; Wei De Zhang; L. M. Gan; Guo Qin Xu; Fwu-Shan Sheu
Electroanalysis | 2003
Jianshan Ye; Ying Wen; Wei De Zhang; L. M. Gan; Guo Qin Xu; Fwu-Shan Sheu
Electroanalysis | 2005
Jianshan Ye; Ying Wen; Wei De Zhang; Hui-Fang Cui; Guo Qin Xu; Fwu-Shan Sheu
Journal of Electroanalytical Chemistry | 2004
Jianshan Ye; Ying Wen; Wei De Zhang; Hui-Fang Cui; L. M. Gan; Guo Qin Xu; Fwu-Shan Sheu
Mikrochimica Acta | 2006
Jianshan Ye; Hui-Fang Cui; Ying Wen; Wei De Zhang; Guo Qin Xu; Fwu-Shan Sheu
Applied Physics A | 2002
W.D. Zhang; Ying Wen; W.C. Tjiu; Guo Qin Xu; L.M. Gan
Electrochemistry Communications | 2005
Jianshan Ye; Hui-Fang Cui; Ying Wen; Wei De Zhang; Angelica L. Ottova; H. Ti Tien; Guo Qin Xu; Fwu-Shan Sheu