PMID- 22428103
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20120823
LR  - 20211021
IS  - 2190-4286 (Electronic)
IS  - 2190-4286 (Linking)
VI  - 3
DP  - 2012
TI  - Mesoporous MgTa(2)O(6) thin films with enhanced photocatalytic activity: On the 
      interplay between crystallinity and mesostructure.
PG  - 123-33
LID - 10.3762/bjnano.3.13 [doi]
AB  - Ordered mesoporous, crystalline MgTa(2)O(6) thin films with a mesoscopic 
      nanoarchitecture were synthesized by evaporation-induced self-assembly (EISA) in 
      combination with a sol-gel procedure. Utilization of novel templates, namely the 
      block copolymers KLE (poly(ethylene-co-butylene)-b-poly(ethylene oxide)) and 
      PIB6000 
      (CH(3)C(CH(3))(2)(CH(2)C(CH(3))(2))(107)CH(2)C(CH(3))(2)C(6)H(4)O(CH(2)CH(2)O)(100)H), 
      was the key to achieving a stable ordered mesoporous structure even upon 
      crystallization of MgTa(2)O(6) within the mesopore walls. The effect of the 
      calcination temperature on the ability of the mesoporous films to assist the 
      photodegradation of rhodamine B in water was studied. As a result, two maxima in 
      the photocatalytic activity were identified in the calcination temperature range 
      of 550-850  degrees C, peaking at 700  degrees C and 790  degrees C, and the origin of this was 
      investigated by using temperature-dependent X-ray scattering. Optimal activity 
      was obtained when the mesoporous film was heated to 790  degrees C; at this temperature, 
      crystallinity was significantly high, with MgTa(2)O(6) nanocrystals of 1.6 nm in 
      size (averaged over all reflections), and an ordered mesoporous structure was 
      maintained. When considering the turnover frequency of such photocatalysts, the 
      optimized activity of the present nanoarchitectured MgTa(2)O(6) thin film was ca. 
      four times that of analogous anatase TiO(2) films with ordered mesopores. Our 
      study demonstrated that high crystallinity and well-developed mesoporosity have 
      to be achieved in order to optimize the physicochemical performance of mesoporous 
      metal-oxide films.
FAU - Wu, Jin-Ming
AU  - Wu JM
AD  - Department of Materials Science and Engineering, Zhejiang University, Hangzhou 
      310027, China.
FAU - Djerdj, Igor
AU  - Djerdj I
FAU - von Graberg, Till
AU  - von Graberg T
FAU - Smarsly, Bernd M
AU  - Smarsly BM
LA  - eng
PT  - Journal Article
DEP - 20120213
PL  - Germany
TA  - Beilstein J Nanotechnol
JT  - Beilstein journal of nanotechnology
JID - 101551563
PMC - PMC3304311
OTO - NOTNLM
OT  - magnesium tantalate
OT  - mesoporous materials
OT  - photocatalytic activity
OT  - self-assembly
OT  - thin films
EDAT- 2012/03/20 06:00
MHDA- 2012/03/20 06:01
PMCR- 2012/02/13
CRDT- 2012/03/20 06:00
PHST- 2011/09/10 00:00 [received]
PHST- 2012/01/31 00:00 [accepted]
PHST- 2012/03/20 06:00 [entrez]
PHST- 2012/03/20 06:00 [pubmed]
PHST- 2012/03/20 06:01 [medline]
PHST- 2012/02/13 00:00 [pmc-release]
AID - 10.3762/bjnano.3.13 [doi]
PST - ppublish
SO  - Beilstein J Nanotechnol. 2012;3:123-33. doi: 10.3762/bjnano.3.13. Epub 2012 Feb 
      13.