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Volumn 131, Issue 3, 2009, Pages 934-936

Single-molecule observation of photocatalytic reaction in TiO2 nanotube: importance of molecular transport through porous structures

Author keywords

[No Author keywords available]

Indexed keywords

FLUORESCENT PROBES; MOLECULAR TRANSPORT; PHOTOCATALYTIC ACTIVITIES; PHOTOCATALYTIC REACTIONS; POROUS STRUCTURES; REACTION MECHANISM; REACTIVE SITE; SINGLE NANOTUBES; SINGLE-MOLECULE; SINGLE-MOLECULE OBSERVATION; SPATIAL HETEROGENEITY; TIO; TIO2 NANOTUBES; TRANSPORT BEHAVIOR;

EID: 67749101437     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja808335b     Document Type: Article
Times cited : (83)

References (30)
  • 1
    • 0004273952 scopus 로고    scopus 로고
    • For example:, Schuth, F, Sing, K. S. W, Weitkamp, J, Eds, Wiley-VCH: Weinheim, Germany
    • For example: Handbook of Porous Solids; Schuth, F., Sing, K. S. W., Weitkamp, J., Eds.; Wiley-VCH: Weinheim, Germany, 2002.
    • (2002) Handbook of Porous Solids
  • 18
    • 67849114698 scopus 로고    scopus 로고
    • The actual quantum yield of the generation of 'OH in the TiO2 nanotube must be defined as the ratio of the number of generated fluorescein molecules (NF1) to the number of photons absorbed by the TiO2 nanotube (Nabs, NF1/ Nabs. However, because of the difficulty of **measuring the absolute number of absorbed photons because of light scattering at the TiO2 surface, instead of the number of absorbed photons, the number of photons irradiated on the TiO2 nanotube (NTiO2) is used to estimate the photocatalytic activity of the TiO2 nanotube. Here, such quantum efficiency is called as the apparent quantum efficiency see Supporting Information for details, section 6
    • 2 nanotube. Here, such quantum efficiency is called as the apparent quantum efficiency (see Supporting Information for details, section 6).
  • 19
    • 67849127254 scopus 로고    scopus 로고
    • As reported elsewhere, OH is trapped on the TiO2 surface and is converted to a less-active surface 'OH with a nearly diffusion-controlled rate;8b,c this indicates that the 'OH generated in the macropore and mesopore scarcely diffuses out of the pores, and hence, the equilibrium concentration of 'OH in the nanotube under UV irradiation depends on the local concentration of the precursor Hu2O2 molecules in the pores. Thus, the photocatalytic activity of the TiO2 nanotube must be closely related to the pore size of its porous structures that determine the accumulated concentration of H2O2
    • 2.
  • 24
    • 67849114697 scopus 로고    scopus 로고
    • It should be noted that the different diffusion behavior of fluorescein molecules in each TiO2 nanotube intrinsic to either the macropore or mesopore is possibly due to the structural heterogeneities, such as the distributions of the diameter of the macropore and the thickness of walls containing the mesopores, which cannot be addressed by the wide-field fluorescence imaging. To clarify the relationship between the diffusion behavior of reagents and the structure of nanotubes at the nanometer scale, a combination of fluorescence imaging and TEM or AFM analysis on a single nanotube is required.11b
    • 11b


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.