Details
| Original language | English |
|---|---|
| Pages (from-to) | 30-36 |
| Number of pages | 7 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 99 |
| Issue number | 1-2 |
| Publication status | Published - 1 Feb 2007 |
Abstract
SiO2 nanotubes (NTS) of different wall thickness were prepared using fibres of [Pt(NH3)4](HCO3)2 salt crystals. During growth of the SiO2 nanotube walls by sol-gel condensation from tetraethyl orthosilicate (TEOS) on the surface of the templating Pt-salt fibres parts of the salt nanocrystals are incorporated into the walls due to strong SiO2-salt interaction. This leads to a significant softening in the vibration density of states (VDS) of SiO2. With increasing thickness of the SiO2 NT walls the degree of Pt-salt incorporation decreases and consequently the observed shifting of IR Si-O vibration bands is more pronounced for NTs with thinner walls. In all cases the VDS relaxes during calcinations to those of pure SiO2. Calcination leads to the formation of Pt nanoparticles and micropores within the nanotube walls.
Keywords
- Calcination, IR spectroscopy, Oxide nanotubes, Pt nanoparticles, Templating Pt-salt
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
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In: Microporous and Mesoporous Materials, Vol. 99, No. 1-2, 01.02.2007, p. 30-36.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - SiO2 nanotubes with nanodispersed Pt in the walls
AU - Rüscher, Claus H.
AU - Bannat, Inga
AU - Feldhoff, Armin
AU - Ren, Lirong
AU - Wark, Michael
PY - 2007/2/1
Y1 - 2007/2/1
N2 - SiO2 nanotubes (NTS) of different wall thickness were prepared using fibres of [Pt(NH3)4](HCO3)2 salt crystals. During growth of the SiO2 nanotube walls by sol-gel condensation from tetraethyl orthosilicate (TEOS) on the surface of the templating Pt-salt fibres parts of the salt nanocrystals are incorporated into the walls due to strong SiO2-salt interaction. This leads to a significant softening in the vibration density of states (VDS) of SiO2. With increasing thickness of the SiO2 NT walls the degree of Pt-salt incorporation decreases and consequently the observed shifting of IR Si-O vibration bands is more pronounced for NTs with thinner walls. In all cases the VDS relaxes during calcinations to those of pure SiO2. Calcination leads to the formation of Pt nanoparticles and micropores within the nanotube walls.
AB - SiO2 nanotubes (NTS) of different wall thickness were prepared using fibres of [Pt(NH3)4](HCO3)2 salt crystals. During growth of the SiO2 nanotube walls by sol-gel condensation from tetraethyl orthosilicate (TEOS) on the surface of the templating Pt-salt fibres parts of the salt nanocrystals are incorporated into the walls due to strong SiO2-salt interaction. This leads to a significant softening in the vibration density of states (VDS) of SiO2. With increasing thickness of the SiO2 NT walls the degree of Pt-salt incorporation decreases and consequently the observed shifting of IR Si-O vibration bands is more pronounced for NTs with thinner walls. In all cases the VDS relaxes during calcinations to those of pure SiO2. Calcination leads to the formation of Pt nanoparticles and micropores within the nanotube walls.
KW - Calcination
KW - IR spectroscopy
KW - Oxide nanotubes
KW - Pt nanoparticles
KW - Templating Pt-salt
UR - http://www.scopus.com/inward/record.url?scp=33845952685&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2006.07.032
DO - 10.1016/j.micromeso.2006.07.032
M3 - Article
AN - SCOPUS:33845952685
VL - 99
SP - 30
EP - 36
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 1-2
ER -