PMID- 19621903
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20100302
LR  - 20091229
IS  - 1520-5827 (Electronic)
IS  - 0743-7463 (Linking)
VI  - 26
IP  - 1
DP  - 2010 Jan 5
TI  - Synthesis of stable mesostructured coupled semiconductor thin films: 
      meso-CdS-TiO(2) and meso-CdSe-TiO(2).
PG  - 538-44
LID - 10.1021/la9022689 [doi]
AB  - Cd(II) ions can be incorporated into the channels of mesostructured titania 
      films, using the evaporation-induced self-assembly (EISA) approach, up to a 
      record high Cd/Ti mole ratio of 25%. The film samples were obtained by spin or 
      dip coating from a mixture of 1-butanol, [Cd(H(2)O)(4)](NO(3))(2), HNO(3), and 
      Ti(OC(4)H(9))(4) and then aging the samples under 50% humidity at 30 degrees C 
      (denoted as meso-xCd(II)-yTiO(2)). The nitrate ions, from nitric acid and cadmium 
      nitrate, play important roles in the assembly process by coordinating as 
      bidentate and bridged ligands to Cd(II) and Ti(IV) sites, respectively, in the 
      mesostructured titania films. The film samples can be reacted under a H(2)S (or 
      H(2)Se) gas atmosphere to produce CdS (or CdSe) on the channel surface and/or 
      pore walls. However, the presence of such a large number of nitrate ions in the 
      film samples also yields an extensive amount of nitric acid upon H(2)S (or 
      H(2)Se) reaction, where the nanoparticles are not stable (they undergo 
      decomposition back to metal ion and H(2)S or H(2)Se gas). However, this problem 
      can be overcome by further aging the samples at 130 degrees C for a few hours 
      before H(2)S (or H(2)Se) reaction. This step removes about 90% of the nitrate 
      ions, eliminates the nitric acid production step, and stabilizes the CdS 
      nanoparticles on the surface and/or walls of the pores of the coupled 
      semiconductor films, denoted as meso-xCdS-yTiO(2). However, the H(2)Se reaction, 
      additionally, needs to be carried at lower H(2)Se pressures in an N(2) atmosphere 
      to produce stable CdSe nanoparticles on the surface and/or walls of the pores of 
      the films, denoted as meso-xCdSe-yTiO(2). Otherwise, an excessive number of Se(8) 
      particles form in the film samples.
FAU - Okur, Halil I
AU  - Okur HI
AD  - Department of Chemistry, Bilkent University, 06800 Ankara, Turkey.
FAU - Turker, Yurdanur
AU  - Turker Y
FAU - Dag, Omer
AU  - Dag O
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
EDAT- 2009/07/23 09:00
MHDA- 2009/07/23 09:01
CRDT- 2009/07/23 09:00
PHST- 2009/07/23 09:00 [entrez]
PHST- 2009/07/23 09:00 [pubmed]
PHST- 2009/07/23 09:01 [medline]
AID - 10.1021/la9022689 [doi]
PST - ppublish
SO  - Langmuir. 2010 Jan 5;26(1):538-44. doi: 10.1021/la9022689.