Self-assembling structures of steroidal derivatives in organic solvents and their sol–gel transcription into double-walled transition-metal oxide nanotubes

2005 ◽  
Vol 15 (35-36) ◽  
pp. 3979 ◽  
Author(s):  
Jong Hwa Jung ◽  
Toshimi Shimizu ◽  
Seiji Shinkai
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Organic Solvents ◽  
Sol Gel ◽  
Transition Metal Oxide ◽  
Self Assembling ◽  
Metal Oxide Nanotubes ◽  
Steroidal Derivatives

Direct Chirality Recognition of Single-Crystalline and Single-Walled Transition Metal Oxide Nanotubes on Carbon Nanotube Templates

2018 ◽  
Vol 30 (44) ◽  
pp. 1803368 ◽  
Author(s):  
Boyuan Shen ◽  
Huanhuan Xie ◽  
Lin Gu ◽  
Xiao Chen ◽  
Yunxiang Bai ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Transition Metal ◽  
Metal Oxide ◽  
Transition Metal Oxide ◽  
Single Crystalline ◽  
Metal Oxide Nanotubes

Introduction of Organic Moieties into Transition-Metal Oxide Matrices via Phosphonate Groups

1998 ◽  
Vol 519 ◽  
Author(s):  
P.H. Mutin ◽  
C. Delenne ◽  
D. Medoukali ◽  
R. Corriu ◽  
A. Vioux
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Phosphonic Acid ◽  
Sol Gel ◽  
Transition Metal Oxide ◽  
Metal Alkoxide ◽  
Hydrolytic Condensation ◽  
Metal Phosphonates ◽  
Or Groups ◽  
Sol Gel Process

AbstractTransition metal oxide / phenylphosphonate hybrids with M/P ratios ranging from 1 to 5, (M= Ti, Zr) and metal phosphonates (M/P = 0.5) have been prepared by a sol-gel process involving in a first step the non-hydrolytic condensation between metal alkoxide and phosphonic acid leading to M-O-P bonds, followed by the hydrolysis-condensation of the remaining M-OR groups. The composition, texture and structure of the materials were investigated using EDX, TGA, XRD, IR and 31P NMR.

Nanotubular Transition Metal Oxide for Hydrogen Production

2011 ◽  
Vol 364 ◽  
pp. 494-499 ◽  
Author(s):  
Srimala Sreekantan ◽  
E Pei San ◽  
Chin Wei Lai ◽  
Warapong Kregvirat
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Rf Sputtering ◽  
Transition Metal Oxide ◽  
Average Diameter ◽  
Ammonium Fluoride ◽  
Photocurrent Density ◽  
Electron Hole ◽  
Entire Study ◽  
Metal Oxide Nanotubes

TiO2, transition metal oxide nanotubes were successfully grown by anodizing of titanium foil (Ti) in ethylene glycol electrolyte containing 5wt % hydrogen peroxide and 5wt % ammonium fluoride for 60 minutes at 60V. It was found such electrochemical condition resulted in the formation of nanotube with average diameter of 90nm and length of 6.6 µm. These samples were used to study the effect of W loading by RF sputtering on TiO2 nanotubes. Amorphous TiO2 nanotube substrate leads to enhance incorporation of W instead of anatase. Therefore for the entire study, W was sputtered on amorphous TiO2 nanotube substrate. TiO2 nanotube sputtered below 1 minute resulted in the formation of W-O-Ti while beyond this point; it accumulates to form a self-independent structure of WO3 on the surface of the nanotubes. TiO2 nanotube sputtered for 1minute at 100W and annealed at 450°C exhibited best photocurrent density (1.4 mA/cm2) with photoconversion efficiency of 2.5%. The reason for such behavior is attributed to W6+ ions allows for electron traps that suppress electron-hole recombination and exploit the lower band gap of material to produce a water splitting process by increasing the charge separation and extending the energy range of photoexcitation for the system.

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