PMID- 17193590
OWN - NLM
STAT- MEDLINE
DCOM- 20070216
LR  - 20131121
IS  - 1613-6829 (Electronic)
IS  - 1613-6810 (Linking)
VI  - 2
IP  - 10
DP  - 2006 Oct
TI  - Highly crystalline WO3 thin films with ordered 3D mesoporosity and improved 
      electrochromic performance.
PG  - 1203-11
AB  - WO3 thin layers with nanometer-scale periodicity were prepared by 
      evaporation-induced self-assembly (EISA) using a novel amphiphilic 
      block-copolymer template (poly(ethylene-co-butylene)-block-poly(ethylene oxide)). 
      The evolution of the mesoporous ordered network and the crystallinity of the 
      framework were monitored by 2D-SAXS, WAXS, SEM, XPS, and porosimetry. By 
      annealing the films, the pore-wall crystallinity is adjusted between fully 
      amorphous and highly crystalline without mesostructural degradation. Thus, the 
      crystalline-film framework is composed of phase-pure monoclinic WO3 nanoparticles 
      (12-14 nm in size). Furthermore, heat treatment transforms the originally 
      spherical mesopores into ellipsoids, resulting in a unidirectionally shrunken, 
      but still well-defined and fully accessible bcc mesopore architecture. The 
      influence of mesoporosity and crystallinity on electrochemical/electrochromic 
      characteristics was addressed by monitoring electrochemical features and the 
      absorption changes during Li insertion/extraction (repetitive potentiostatic 
      cycling). Both the amorphous and crystalline mesoporous films possess 
      electrochromic response times on the order of only seconds, which are 
      attributable to the facilitated insertion of guest ions due to shortening of the 
      diffusion path lengths. Also, the insertion/extraction reversibility of 
      crystalline WO3 layers with 3D mesoporosity is improved compared to amorphous 
      ones and reaches values close to 100%.
FAU - Brezesinski, Torsten
AU  - Brezesinski T
AD  - Max Planck Institute of Colloids and Interfaces, Research Campus Golm, Am 
      Muhlenberg 1, 14476 Potsdam-Golm, Germany. Torsten.Brezesinski@mpikg-golm.mpg.de
FAU - Rohlfing, Dina Fattakhova
AU  - Rohlfing DF
FAU - Sallard, Sebastien
AU  - Sallard S
FAU - Antonietti, Markus
AU  - Antonietti M
FAU - Smarsly, Bernd M
AU  - Smarsly BM
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - Germany
TA  - Small
JT  - Small (Weinheim an der Bergstrasse, Germany)
JID - 101235338
RN  - 0 (Oxides)
RN  - 0 (Polymers)
RN  - 940E10M08M (tungsten oxide)
RN  - V9306CXO6G (Tungsten)
SB  - IM
MH  - Crystallization
MH  - Diffusion
MH  - Electrochemistry/*methods
MH  - Fourier Analysis
MH  - Glass
MH  - Materials Testing
MH  - Microscopy, Atomic Force
MH  - Microscopy, Electron
MH  - Microscopy, Electron, Scanning
MH  - Microscopy, Electron, Transmission
MH  - Nanotechnology/*methods
MH  - Oxides/*chemistry
MH  - Polymers/chemistry
MH  - Scattering, Radiation
MH  - Surface Properties
MH  - Tungsten/*chemistry
MH  - X-Ray Diffraction
EDAT- 2006/12/29 09:00
MHDA- 2007/02/17 09:00
CRDT- 2006/12/29 09:00
PHST- 2006/12/29 09:00 [pubmed]
PHST- 2007/02/17 09:00 [medline]
PHST- 2006/12/29 09:00 [entrez]
AID - 10.1002/smll.200600176 [doi]
PST - ppublish
SO  - Small. 2006 Oct;2(10):1203-11. doi: 10.1002/smll.200600176.