Papers by Author: Lin Guo

Abstract: 2-D SnO₂ nanosheets with controllable thickness have been synthesized via a simple hydrothermal method. Characterization shows that the sheet thickness can be controlled from 3 to 30 nm. The correlation between the sheet thickness and the electrochemical performance of these samples as anode materials for Li ion batteries were investigated, it was found that when the sheet thickness less than 10 nm, electrodes with high charge/discharge capacities, coulombic efficiencies and stable cycling performance could be realized. The good electrochemical performance are ascribe to the ultra thin nanosheet, good flexility and porous structure of the SnO₂ anode material.

Abstract: A sensitive aptamer-based signal-on sensor for real-time detection of L-histidine via self-cleavage of DNAzymes and amplification of elongated tetrahexaheral gold nanocrystals (end-truncated-ETHH-Au-NCs) is presented. The introduction of target L-histidine induced self-cleavage of DNAzymes on the end-truncated-ETHH-Au-NCs modified glassy carbon electrode (GCE) into the solution. The resulting change in electron transfer efficiency is readily measured by square wave voltammetry (SWV) at target L-histidine concentrations as low as 0.1 pM, the increase in the SWV peak current is linear with the concentration of L-histidine in the range from 0.1 pM to 0.1 μM. The fabricated aptasensor shows a high specificity for L-histidine which is not affected by the coexistence of other amino acids, and an excellent enantio-selectivity toward L-histidine was achieved.

Abstract: One-dimensional LaNiO3 nanochains can be generated with high yield by a simple calcination process using La(OH)3/Ni(OH)2 coaxial nanocables as parent template. Those coaxial nanocables can be synthesized by a simple hydrothermal method. The final LaNiO3 ceramics keep the morphology of parent precursor.

Abstract: Bi porous films were prepared via a simple process which involves solvothermal or thermal treatment of Bi(NO3)3 and alumina membranes. The reducing reagent is helpful for the growth of Bi in the channels of alumina templates. However, Bi networked X-shape nanowires would form when the reaction was carried out under vacuum system. This method has been successfully applied to the synthesis of other porous metal film. The pressure, reducing reagent and starting materials play a key role in the growth of Bi films. A possible formation mechanism of Bi films and nanowires is proposed.

Abstract: Monodisperse wurtzite ZnO nanorods with the length of 4 μm and the diameter of 200 nm were prepared via a simple solution chemical process. The crystal phases and the microstructure of nanorods were studied via XRD, SEM, respectively. The properties of the excitonic luminescence are investigated by using the laser power dependence and temperature dependence of photoluminescence (PL) spectra.

Abstract: Co-silica nanotubes were prepared with nanofibers of [Co(NH3)6](HCO3)(CO3)·2H2O as templates. The yield and morphology of Co-silica nanotubes were influenced by the pH value of the ammonia solution, the concentration of the Co salt solution as well as the rate of ethanol addition. The optimized sample contains 100% nanotubes with 150 – 300 nm in diameter and up to 30 -m in length.

Abstract: The precursor of LaMnO3 obtained by the reaction of metal salt with potassium hydroxide was subjected to hydrothermal condition in an autoclave then the precipitate was treated in different temperatures (600-900°C). The effect of precursor type and hydrothermal crystallization conditions on the morphology of lanthanide manganese grains was investigated. The morphology and the structure of the products was studied by transmission electron microscope (TEM) and X-ray diffraction (XRD). Different shapes of LaMnO3 can be obtained by controlling prepare condition and treated temperature. The XRD results showed the formation of perovskite-type LaMnO3.

Abstract: Fe3O4 nanoparticles were simply prepared by a wet chemical solution method. In this method, poly (N-vinyl-2-pyrrolidone) (PVP) was used as surface modified reagent to control the shape of the product. Transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD) were used to characterize the asprepared Fe3O4 nanoparticles. Furthermore, the magnetic properties of the sample were investigated by a VSM (vibrating sample magnetometer) technique.