不同退火条件对多孔阳极氧化铝热释光的影响

本文采用两步阳极氧化法在0.5mol/L的草酸溶液中制备了多孔且排列有序的多孔阳极氧化铝（PAA）薄膜，并对薄膜进行不同条件的退火后处理，通过对PAA薄膜的热释光（TL）特性表征和机理分析，研究了基底及后处理中退火时间、退火温度及退火气氛等条件对其热释光特性的影响．结果表明，相同辐照剂量下，去除铝基底的双通PAA薄膜，接触辐射面积大，吸收辐射能量多，表现出更强的热释光响应；相同退火环境中，经γ辐照后的PAA薄膜的TL特性随退火处理的时间延长而增强；退火时间均控制为4h时，薄膜的TL强度随退火温度的升高也明显增强，在空气中经600℃退火的PAA薄膜显示出最大的TL强度；并且PAA薄膜在空气中退火后的TL发光强度明显高于在真空中退火后的强度．

The Influence of Different Annealing Conditions on the Thermoluminescence of Porous Anodic Alumina

In this work , porous anodic alumina（PAA） membranes with ordered pore arrays were prepared in 0.5M /L oxalic acid by a two-step anodization method. We have investigated the influence of aluminum substrate, annealing time, annealing temperature and annealing atmosphere on the thermoluminescence （TL） characterization of porous anodic alumina films and discussed the influence mechanisms. TL measurements show that the porous anodic alumina films without aluminum substrate present stronger TL intensity under the same irradiation dose, which can be explained by its more radiation energy absorption resulted by its larger area exposure to radiation.The TL intensity of the annealed samples increases with extension of annealing time afterγirradiation at the same annealing atmosphere;When the annealing time was limited to 4 hours, the TL intensity of the samples also increases with elevated annealing temperature, and reaches the maximum when the annealing temperature T=600℃in air. The TL intensity of porous anodic alumina films annealed in the air is significantly stronger than that annealed in vacuum.