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Volumn 111, Issue 14, 2007, Pages 5259-5275

Mechanistic insight into the TiO2 photocatalytic reactions: Design of new photocatalysts

Author keywords

[No Author keywords available]

Indexed keywords

ADSORBATES; ADSORPTION; CYCLODEXTRINS; FLUORESCENCE; NANOPARTICLES; ORGANIC COMPOUNDS; PHOTOCATALYSIS; PURIFICATION; TITANIUM DIOXIDE;

EID: 34247843032     PISSN: 19327447     EISSN: 19327455     Source Type: Journal    
DOI: 10.1021/jp069005u     Document Type: Article
Times cited : (695)

References (183)
  • 50
    • 34248170549 scopus 로고    scopus 로고
    • The nanosecond laser flash photolysis experiments were performed using the third harmonic generation (355 nm, 5 ns FWHM) from a Q-switched Nd 3+:YAG laser (Continuum, Surelite II-10) for the excitation operated with temporal control by a delay generator (Stanford Research Systems, DG535, The analyzing light from a CW or pulsed 450 W Xe-arc lamp (Ushio, UXL-451-0) was collected by a focusing lens and directed through a grating monochromator (Nikon, G250) to a silicon avalanche photodiode detector (Hamamatsu Photonics, S5343) or a photomultiplier tube (Hamamatsu Photonics R928, The transient signals were recorded with a digitizer Tektronix, TDS 580D, To avoid stray light and pyrolysis of the sample by the probe light, suitable filters were employed. The irradiation energy was measured using a power meter. All measurements were carried out at room temperature
    • 3+:YAG laser (Continuum, Surelite II-10) for the excitation operated with temporal control by a delay generator (Stanford Research Systems, DG535). The analyzing light from a CW or pulsed 450 W Xe-arc lamp (Ushio, UXL-451-0) was collected by a focusing lens and directed through a grating monochromator (Nikon, G250) to a silicon avalanche photodiode detector (Hamamatsu Photonics, S5343) or a photomultiplier tube (Hamamatsu Photonics R928). The transient signals were recorded with a digitizer (Tektronix, TDS 580D). To avoid stray light and pyrolysis of the sample by the probe light, suitable filters were employed. The irradiation energy was measured using a power meter. All measurements were carried out at room temperature.
  • 51
    • 34248215007 scopus 로고    scopus 로고
    • -6 M). Transmission electron microscopy (TEM) (JEOL, JEM-3000F, 2000001) and atomic force microscopy (AFM) (Seiko Instruments Inc., SPA400-DFM, SI-DF20) images indicated that the mean particle size of the material was about 4.5 nm.
    • -6 M). Transmission electron microscopy (TEM) (JEOL, JEM-3000F, 2000001) and atomic force microscopy (AFM) (Seiko Instruments Inc., SPA400-DFM, SI-DF20) images indicated that the mean particle size of the material was about 4.5 nm.
  • 58
    • 34248141024 scopus 로고    scopus 로고
    • 61
    • 61
  • 76
    • 34248160860 scopus 로고    scopus 로고
    • Assuming a random distribution of distances between the electrons in the TiO2 nanoparticle and the adsorbed Ṡ+,77 kBET can be expressed as kBET=2π/ ℏ[H ab]2lSC/d SC2/3 (6/π)1/3. 1/√4πΛkBT exp, ΔGBET+ Λ)2/4ΛkBT](4) where ℏ is Planck's constant divided by 2π, kB is Boltzmann's constant, T is the absolute temperature, Hab is the electronic coupling for a second-order reaction, lSC is the effective coupling length between S, and the nanoparticle, dSC is the density of the atoms that contribute to the density of states in the band concerned, ΔGBET is the free-energy change for BET ΔGBET, E
    • 2.
  • 104
    • 34248175623 scopus 로고    scopus 로고
    • 105
    • 105
  • 106
    • 34248206532 scopus 로고    scopus 로고
    • The femtosecond transient absorption spectra were measured by the pump and probe method using a regeneratively amplified titaniumsapphire laser (Spectra Physics, Spitfire Pro F, 1 kHz) pumped by a Nd: YLF laser (Spectra Physics, Empower 15, The seed pulse was generated by a titanium-sapphire laser (Spectra-Physics, Tsunami 3941-M1BB, 80 fs FWHM) pumped with a diode-pumped solid-state laser (Spectra-Physics, Millennia VIIIs, The fourth harmonic generation (330 nm, 5 μJ pulse-1) of the optical parametric amplifier (Spectra Physics, OPA-800CF-1) was used as the excitation pulse. A white-light continuum pulse, which was generated by focusing the residual of the fundamental light on the flowing water cell after the computer-controlled optical delay, was divided into two parts and used as the probe and the reference lights, of which the latter was used to compensate the laser fluctuation. Both the probe and reference lights were directed to the rotating sample cell with a 1.0
    • -1) of the optical parametric amplifier (Spectra Physics, OPA-800CF-1) was used as the excitation pulse. A white-light continuum pulse, which was generated by focusing the residual of the fundamental light on the flowing water cell after the computer-controlled optical delay, was divided into two parts and used as the probe and the reference lights, of which the latter was used to compensate the laser fluctuation. Both the probe and reference lights were directed to the rotating sample cell with a 1.0 mm optical path and detected by the CCD detector equipped with the polychromator (Solar, MS3504).
  • 140
    • 34248167977 scopus 로고    scopus 로고
    • Me-C = 17.4 ppm) as the external reference.
    • Me-C = 17.4 ppm) as the external reference.
  • 162
    • 34248196884 scopus 로고    scopus 로고
    • The experimental setup is based on using an Olympus IX71 TIRF microscope. Light emitted from a continuous wave (CW) Nd:YAG laser (532 nm, 50 mW) or a CW Ar ion laser (488 nm, 10 mW) passing through an objective lens (Olympus, PlanApo, 1.45 NA, 100×) was totally reflected at the coverslip-air interface to obtain an evanescent field which can excite a dye molecule. The fluorescence from single dyes (Alexa Fluor 532, Molecular Probes) was immobilized onto a glass coverslip via N-[3-trimethoxysilylpropyl] ethylenediamine (TSE, The TiO2 aqueous solution (Ishihara Sangyo, STS-21) was diluted with Milli-Q water (80 sonicated overnight, and coated on a slide glass by spin-coating. The resulting TiO2 film was calcined at 400°C for 1 h to obtain an optically opaque TiO 2-coated glass plate (film thickness is about 1 μm, The intervening gap was controlled using polyimide films Nilaco, The TiO 2 coating was irradiated with a 100
    • 2 coating was irradiated with a 100 W Hg lamp that passed through a band-pass filter (330-385 nm), an objective lens, and a dye-modified coverslip.
  • 163
    • 34248153593 scopus 로고    scopus 로고
    • 165
    • 165
  • 173
    • 34248209971 scopus 로고    scopus 로고
    • Samples for the single-molecule experiments were prepared by first spin-coating a toluene solution of PMMA on a clean cover glass, followed by spin-coating a chloroform solution of TDI. The PMMA film was used as both the self-sensitization inhibitor of TDI and the .OH scavenger
    • .OH scavenger.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.