Desorption of tritiated water on materials by photon and electron irradiation

Chiba, Kosuke; Sato, R.; Yoneoka, Toshiaki; Tanaka, Satoru

doi:10.1016/s0920-3796(02)00262-4

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…At a pressure of 20, 450, and 5000 Pa, the current was 2.3, 0.52, and 0.17 pA, respectively; upon UV illumination, the current increases rapidly to 8.3, 4.1, and 2.6 pA, respectively; as the light is off, the current decreases rapidly to its original level. [15][16][17] The UV response of the ceria nanowires in dry O 2 condition, as illustrated in Fig. The positive UV response reflects the intrinsic semiconducting property of the ceria nanowires, similar to that observed in bulk case and in many other semiconductor nanostructures.…”

supporting

confidence: 68%

“…Figure 4͑b͒ indicates that the ceria nanowires exhibit positive photoconductivity in dry O 2 atmosphere. 15 For instance, green laser illumination does not apparently change the conductance of the nanowire film in air ͑not shown here͒. Additionally, with increasing the oxygen pressure, the current across the nanowire film decreases regardless of the UV lamp being on or off, as summarized in Table I.…”

mentioning

confidence: 89%

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Anomalous photoconductivity of CeO2 nanowires in air

Wang

Feng

et al. 2007

Applied Physics Letters

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The conductance of the CeO2 nanowire film is found to decrease by about two orders of magnitude in air under ultraviolet illumination. Such a drastic decrease in conductance is attributed to light-induced desorption of H2O from the nanowire’s surface. When exposed in air, the surface conductivity of the nanowire increases significantly due to the adsorption of H2O. Considering the large surface-to-volume ratio of the nanowire, the conductance of the nanowire film is mainly controlled by surface conduction. Upon ultraviolet illumination, desorption of H2O results in the decrease of the conductance of the nanowire film, thus leading to the anomalous photoconductivity.

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supporting

confidence: 68%

mentioning

confidence: 89%

Anomalous photoconductivity of CeO2 nanowires in air

Wang

Feng

et al. 2007

Applied Physics Letters

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“…The anomalous photoconductivity may be attributed to light induced desorption of water molecules on ZnO NPs [41]. Bera and Basak [42] also show that there is not much change in the number of surface adsorbed oxygen molecules if the ZnO nanowires are annealed in vacuum.…”

Section: Field Dependence Of Photocurrent and Dark-currentmentioning

confidence: 98%

“…During the light irradiation, phenomenon of photodesorption of water molecule through the electronic excitation [42,43], light induced heat [44] and vibration [45] takes place. The slow photodesorption of water molecules leads to the slow decrease of conductivity.…”

Section: Rise and Decay Of Photocurrentmentioning

confidence: 99%

Photoconductivity and photoluminescence of ZnO nanoparticles synthesized via co-precipitation method

Kripal

Gupta

Srivastava

et al. 2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

116

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“…From the viewpoint of tritium safety in a fusion reactor, an effective method of removing adsorbed tritium is needed and several techniques have been proposed [1][2][3][4][5][6][7][8]. Irradiation by energetic particles (electrons, or ions) or photons of the surface of contaminated materials has been proposed as an effective method to remove tritium and the effect of this method has been investigated [3][4][5][6][7][8]. However, the fundamental desorption mechanism remains to be elucidated.…”

Section: Introductionmentioning

confidence: 99%