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小木虫论坛-学术科研互动平台 » 化学化工区 » 催化 » 理论交流 » ESR
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weijun.deng

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[交流] ESR

ESR 如何能够看出激子的寿命？

The ESR data are shown in
Fig. 6. It can be seen that the total intensity of hydroxyl radical
(?OH) species and superoxide radical (O2
?2) species as detected
over the CeO2-NT sample is higher than that over the CeO2-NP
and commercial P25 nanoparticles. In addition, it should be
noted that, upon light irradiation, the O2
?2 radical species are
clearly observed over only the CeO2-NT sample but they are not
observed over the samples of P25 and CeO2-NP. These suggest
the prolonged lifetime of electron–hole pairs generated over the
sample of CeO2-NT upon light irradiation. As a result, as
reflected in Fig. 6, a greater amount of radical species with
strong oxidation power, including ?OH species and superoxide
radical O2
?2 is able to be photogenerated over the CeO2-NT
than its counterpart CeO2-NP and commercial P25 nanoparticles.
This in turn explains reasonably why the higher photocatalytic
activity of CeO2 nanotubes than CeO2 and P25
nanoparticles has been observed toward the gas-degradation of
benzene, as schematically shown in Fig. 7.
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weijun.deng

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Electron spin resonance
(ESR) spectra were measured using a Bruker A300 EPR electron
paramagnetic resonance spectrometer equipped with a quanta-
Ray Nd:YAG laser system as their radiation light source (l =
254 nm). The settings were the center field at 3480.00 G,
microwave frequency at 9.83 GHz, and power at 6.35 mW.
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2楼2014-04-27 11:13:50
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weijun.deng

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原文中的图例：

详见文章： RSC Advances, 2011, 1, 1772–1777
ESR
ESR.png
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3楼2014-04-27 11:20:05
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