Papers by Author: Hui Min Huang

Abstract: Si/carbon nanofibers (Si/CNFs) composite used as the anode materials of lithium-ion battery have been prepared via electrospinning and calcinations treatment. Hydrofluoric acid is used to remove surface oxides of Si particles. SEM observation indicates that silicon particles are uniformly embedded in the carbon nanofibers. X-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDX) and Raman scattering have been used to analysis the composition and phase of the composite materials. The first reversible capacity of the Si/CNFs composite is 1004 mAh/g, and 390 mAh/g has been remained after 100 cycles. Such Si/CNFs composite could be a promising anode material in lithium ion batteries.

Abstract: LiCl doped titania (TiO₂) hollow nanofibers were prepared by using polylactide (PLA) nanofibers as templates. The morphology and crystal structure of the TiO₂ hollow nanofibers were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The as-prepared LiCl doped TiO₂ hollow nanofibers exhibited a good humidity-sensing property. During the relative humidity (50%-95%) measurement, the response and recovery time is about 3 and 4 s, separately, with good linearity. The relationship between the humidity-sensing properties and the structure of the hollow nanofibers was also discussed. These distinguished and sensitive sensing performances make this material a good candidate in fabricating humidity sensors.

Abstract: Polyaniline doped with camphorsulfonic acid (PANI.HCSA) nanofibers have been successfully prepared using “nanofibers template” via electrospinning. The PVA nanofibers were used as a template to get the PANI/PVA composite fibers. After removing the template by heat treatment, the PANI fibers were obtained. Scanning electron microscope (SEM) with the Energy Dispersive X-Ray Spectrometer software (EDX) and FT-IR spectra were used to characterize the composite fibers and the PANI.HCSA nanofibers. The average diameters of the composite fibers obtained and PANI fibers were 920 nm and 530 nm, respectively.

Abstract: The carbon-nanofibers carrying Ag nanoparticles (Ag/CNF) have been successfully obtained via electrospinning followed by calcination. For it, AgNO3/polyacrylonitrile (PAN) fibers were firstly prepared as an intermediate and then the intermediate was calcined at 600°C for 4h to transit the PAN nanofibers to the CNF and reduce AgNO3 to the Ag nanoparticles. Transmission electron microscope (TEM), Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) were used to characterize their morphologies and structures. The results show that the diameters of the Ag nanoparticles and CNF are 5 nm and 180 nm on the average, respectively. Most of the Ag nanoparticles were located on the surface of carbon nanofibers.