Measurement of the physical and electronic properties of ordered nanoporous alumina using XUV excitation spectroscopy

Measurement of the physical and electronic properties of ordered nanoporous alumina using XUV excitation spectroscopy
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使用 XUV 激发光谱测量有序纳米多孔氧化铝的物理和电子性质

DOI:
10.1088/0022-3727/42/19/195404
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Nasir M
Nasir M
中科院分区:
--
文献类型:
--
作者:
Nasir M

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采用x射线光谱法研究了高有序纳米多孔氧化铝的物理和电子性质。x射线激发光学发光和光致发光(PL)测量显示,由于F和F+中心发射的复杂混合,产生了宽的蓝色发光带。为了进一步了解辐射跃迁的物理性质,给出了温度依赖性和全宽度半最大值数据。从光致发光激发光谱(PLE)来看,与先前文献一致,6 eV波段与F中心有关,而5.2 eV波段可能与F+中心的存在有关。在纳米多孔材料的PLE光谱中没有发现激子吸收的证据,这可能是由于纳米多孔材料的无定形性质。x射线吸收数据显示,铝在多孔氧化铝中的L吸收边发生了化学位移,也证实了纳米多孔氧化铝的无定形性质。
X-ray spectroscopy was used to probe the physical and electronic properties of highly ordered nanoporous alumina. X-ray excited optical luminescence and photoluminescence (PL) measurements showed a broad blue luminescence band that is due to a complex mixture of emission from F and F+ centres. To further understand the physics of the radiative transition, temperature dependence and full width half maximum data are presented. From photoluminescence excitation spectroscopy (PLE), it is suggested that the 6 eV band is associated with F centres in keeping with the previous literature, while the 5.2 eV band could be associated with the presence of F+ centres. There is no evidence of excitonic absorption in the PLE spectra of the nanoporous material and this may be due to the amorphous nature of nanoporous material. The x-ray absorption data showed a chemical shift in the L absorption edge of aluminium in porous alumina and also confirms the amorphous nature of nanoporous alumina.
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