Using Fe doped titania powders as the precursor, Fe doped TiO2 nanotubes with small diameter of 10nm were obtained by hydrothermal method. The doped titania powders have two different crystalline phases, anatase and r...Using Fe doped titania powders as the precursor, Fe doped TiO2 nanotubes with small diameter of 10nm were obtained by hydrothermal method. The doped titania powders have two different crystalline phases, anatase and rutile of which the average particle diameters are 30.3nm and 41.7nm, receptively. The products were characterized by TEM, XRD and EDS. The results showed that Fe doped TiO2 nanotubes of 200nm in length could be obtained from Fe doped rutile powder, and have higher yields. The formation mechanism of long titania nanotubes was suggested in the light of the relative stability of crystalline phase.展开更多
In this paper different shapes of ZnO crystals were synthesized by hydrotherma l method when different concentrations of mineralizer were used. When KOH was le ss than 2mol·L-1 and the fill factor was approximate...In this paper different shapes of ZnO crystals were synthesized by hydrotherma l method when different concentrations of mineralizer were used. When KOH was le ss than 2mol·L-1 and the fill factor was approximately 35%at 350℃, ZnO cryst als were synthesized with size of several hundred nanometer or several micron. T he shapes of crystals were hexagonal cones. When 3mol·L-1 KOH was used as mine ralize at 350℃and the fill factor was approximately 35%, the crystals with man y different sizes were synthesized, the size of maximal crystal was over 100 mic ron, the small-size crystals were only several micron. When mineralizer KOH was less than 1mol·L-1 and the fill factor was approximately 35%at 430℃, ZnO cr ystals were synthesized with size of several hundred nanometer or several micron . The shapes of crystals were hexagonal cones. When 1.5mol·L-1 KOH or 2mol·L -1 KOH was used as mineralize at 430℃and the fill factor was approximately 35 %, the high quality and hexagonal prism crystals were synthesized with many dif ferent sizes, the size of maximal crystal was over 100 micron, the small-size c rystal was only several micron. Especially when 3mol·L-1 KOH was used as miner alize at 430℃and the fill factor was approximately 35%, the high quality and h exagonal prism crystals were synthesized <IMG SRC="IMAGE/09150023.JPG" HEIGHT=11 WIDTH=23><IMG SRC="IMAGE/09150024.JPG" HEIGHT=11 WIDTH=23><IMG SRC="IMAGE/09150 025.JPG" HEIGHT=11 WIDTH=23><IMG SRC="IMAGE/09150026.JPG" HEIGHT=11 WIDTH=23><IM G SRC="IMAGE/09150027.JPG" HEIGHT=11 WIDTH=23>with size of 1mm along c axis. The exposed faces were hexagonal faces m{}, hexagonal cone faces p{}, negative pola r faces O{}. In addition, many crystals with the shape of hexagonal cone and in several micron to 50 μm of size were present. The exposed faces were hexagonal cone faces p{}, negative polar faces {}.展开更多
Multielemental bimetallic molybdenum-tungsten oxide nanorods were synt hesized under mild hydrothermal conditions with the aid of Na2SO4 salt, using fr eshly prepared molybdic-tungstenic acid precipitate as precursor....Multielemental bimetallic molybdenum-tungsten oxide nanorods were synt hesized under mild hydrothermal conditions with the aid of Na2SO4 salt, using fr eshly prepared molybdic-tungstenic acid precipitate as precursor. The products w ere characterized by TEM, SEM, XRD, EDS and PL. The results show that the stoich iometric relation of as-synthesized molybdenum-tungsten oxide nanorods is Mo1.8W 16.2O49. The formation of molybdenum-tungsten oxide nanorod is related to SO42-.展开更多
文摘Using Fe doped titania powders as the precursor, Fe doped TiO2 nanotubes with small diameter of 10nm were obtained by hydrothermal method. The doped titania powders have two different crystalline phases, anatase and rutile of which the average particle diameters are 30.3nm and 41.7nm, receptively. The products were characterized by TEM, XRD and EDS. The results showed that Fe doped TiO2 nanotubes of 200nm in length could be obtained from Fe doped rutile powder, and have higher yields. The formation mechanism of long titania nanotubes was suggested in the light of the relative stability of crystalline phase.
文摘In this paper different shapes of ZnO crystals were synthesized by hydrotherma l method when different concentrations of mineralizer were used. When KOH was le ss than 2mol·L-1 and the fill factor was approximately 35%at 350℃, ZnO cryst als were synthesized with size of several hundred nanometer or several micron. T he shapes of crystals were hexagonal cones. When 3mol·L-1 KOH was used as mine ralize at 350℃and the fill factor was approximately 35%, the crystals with man y different sizes were synthesized, the size of maximal crystal was over 100 mic ron, the small-size crystals were only several micron. When mineralizer KOH was less than 1mol·L-1 and the fill factor was approximately 35%at 430℃, ZnO cr ystals were synthesized with size of several hundred nanometer or several micron . The shapes of crystals were hexagonal cones. When 1.5mol·L-1 KOH or 2mol·L -1 KOH was used as mineralize at 430℃and the fill factor was approximately 35 %, the high quality and hexagonal prism crystals were synthesized with many dif ferent sizes, the size of maximal crystal was over 100 micron, the small-size c rystal was only several micron. Especially when 3mol·L-1 KOH was used as miner alize at 430℃and the fill factor was approximately 35%, the high quality and h exagonal prism crystals were synthesized <IMG SRC="IMAGE/09150023.JPG" HEIGHT=11 WIDTH=23><IMG SRC="IMAGE/09150024.JPG" HEIGHT=11 WIDTH=23><IMG SRC="IMAGE/09150 025.JPG" HEIGHT=11 WIDTH=23><IMG SRC="IMAGE/09150026.JPG" HEIGHT=11 WIDTH=23><IM G SRC="IMAGE/09150027.JPG" HEIGHT=11 WIDTH=23>with size of 1mm along c axis. The exposed faces were hexagonal faces m{}, hexagonal cone faces p{}, negative pola r faces O{}. In addition, many crystals with the shape of hexagonal cone and in several micron to 50 μm of size were present. The exposed faces were hexagonal cone faces p{}, negative polar faces {}.
文摘Multielemental bimetallic molybdenum-tungsten oxide nanorods were synt hesized under mild hydrothermal conditions with the aid of Na2SO4 salt, using fr eshly prepared molybdic-tungstenic acid precipitate as precursor. The products w ere characterized by TEM, SEM, XRD, EDS and PL. The results show that the stoich iometric relation of as-synthesized molybdenum-tungsten oxide nanorods is Mo1.8W 16.2O49. The formation of molybdenum-tungsten oxide nanorod is related to SO42-.
