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Volumn 24, Issue 24, 2008, Pages 14035-14041

Formate adsorption onto thin films of rutile TiO2 nanorods and nanowires

Author keywords

[No Author keywords available]

Indexed keywords

ADSORPTION; CARBOXYLATION; CHEMICAL STABILITY; ELECTRIC WIRE; ELECTRODEPOSITION; ELECTROMAGNETIC WAVE REFLECTION; NANORODS; NANOWIRES; ORGANIC ACIDS; OXIDE MINERALS; PRISMS; SEMICONDUCTING ZINC COMPOUNDS; SILICON; TITANIUM OXIDES;

EID: 61849126747     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la8021326     Document Type: Article
Times cited : (12)

References (32)
  • 19
    • 61849089367 scopus 로고    scopus 로고
    • The 10-fold higher intensity results from a 10-fold higher value of the so-called effective path length (de) in the case of ZnSe. The value of de represents the path length in a (hypothetic) transmission experiment resulting in the same absorption as in the ATR experiment. For bulk aqueous solutions, de can be calculated according to ref 11 as de, n2d p, 2 cos θ)E622, where n 21, n2/n1 E0,2 is the relative electric field amplitude in medium 2 at a distance z, 0 from the interface, dp is the penetration depth eq 1, and θ is the angle of incidence
    • p is the penetration depth (eq 1), and θ is the angle of incidence.
  • 20
    • 61849170120 scopus 로고    scopus 로고
    • Measurements using the Si prism instead of the ZnSe prism were also performed but resulted in too low signal-to-noise ratios
    • Measurements using the Si prism instead of the ZnSe prism were also performed but resulted in too low signal-to-noise ratios.
  • 21
    • 61849134879 scopus 로고    scopus 로고
    • Assuming a fraction of particles of 0.5 for both TiO2 layers, the refractive index n2 of the films can be determined from the weighed average of the refractive index of the particle material and the aqueous solution (ref 5, With n(H2O, 1.34 and n(TiO2, 2.0, n2 is calculated to be 1.67. Thus, the penetration depth (dp) of the evanescent wave at 1500 cm-1 amounts to 3.52 μm in the case of a nanorod film on ZnSe and 0.44 μm in the case of a nanowire film on Si. It has to be mentioned that the determination of the penetration depth for the system Si(ZnSe)/TiO2/solution by using a two-layer model is only valid for a film thickness d · dp. With d, 8 μm in the case of the nanorod film and d, 2 μm in the case of the nanowire film, this requirement is fulfilled for both samples
    • p. With d = 8 μm in the case of the nanorod film and d = 2 μm in the case of the nanowire film, this requirement is fulfilled for both samples.
  • 22
    • 61849127815 scopus 로고    scopus 로고
    • In a recent study (ref 17) we found that, for a given thickness, the real surface area of a nanowire film is around 24 times larger than the surface area of a film prepared from nanorods by thermal annealing. Assuming that the decrease of the specific surface area during thermal annealing is compensated by the decrease of the film porosity and estimating the difference of the effective path lengths from the measurements using the uncoated prisms de[ZnSe] ∼10de[Si, Figure 2, the surface area of the nanowire film on Si being probed in the ATR-IR experiment can be estimated to be around 2.4 times that of the nanorod film on ZnSe. This estimate approximately matches the relative intensities of the IR bands in Figure 3
    • e[Si], Figure 2), the surface area of the nanowire film on Si being probed in the ATR-IR experiment can be estimated to be around 2.4 times that of the nanorod film on ZnSe. This estimate approximately matches the relative intensities of the IR bands in Figure 3.
  • 23
    • 61849106038 scopus 로고    scopus 로고
    • Origin 7, Origin Lab. Corp., 1991-2002.
    • Origin 7, Origin Lab. Corp., 1991-2002.
  • 25
    • 61849084198 scopus 로고    scopus 로고
    • The broad peak at 1530/1528 cm-1 may result from a number of additional adsorbate geometries due to the presence of various, less abundant adsorption sites (crystal faces) on the nanocrystals
    • -1 may result from a number of additional adsorbate geometries due to the presence of various, less abundant adsorption sites (crystal faces) on the nanocrystals.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.