Porous anodic aluminum oxide (PAAO) films have attracted widespread attention because they can be used as porous templates for the preparation of various nanomaterials. However, there are still some challenges. For example, although fine control of the thickness of AAO films is generally quite easy to achieve, it is difficult to control the thickness of extremely thin films (e.g. <1µm). This is important for practical applications where accurate control of film thickness is necessary. In the present work, PAAO films have been prepared in an electrolyte composed of a mixture of ethanol and oxalic acid under 40–50 V (at −20−0 ^oC), attaining a minimum growth rate (ν_a) of ∼1.4 nm min⁻¹ (at −20 ^oC). The influence of anodization conditions on ν_a, the regularity of structural cells, and the interpore distance has been studied in detail. The results show that ν_a can be reduced effectively by using an extremely low anodization temperature. Ultra-thin PAAO films with precisely controlled thicknesses have been fabricated using this approach.

多孔阳极氧化铝（PAAO）薄膜已引起广泛关注，因为它们可以用作制备各种纳米材料的多孔模板。但是，仍然存在一些挑战。例如，尽管通常很容易实现AAO膜厚度的精细控制，但是很难控制极薄的膜（例如<1µm）的厚度。这对于需要精确控制薄膜厚度的实际应用非常重要。另外，在本工作中，PAAO膜已经在乙醇和草酸的混合物构成的电解质制备下40-50 V（在-20-0 ^Ô（C），获得的最小生长速率ν_一个）的〜1.4纳米最小^-1（在-20 ^oC）。对阳极氧化条件的影响ν_一个，结构单元的规律性，并且interpore距离已经被详细研究。结果表明，ν_一个可以通过使用非常低的阳极氧化温度有效地降低。使用这种方法可以制造出厚度精确控制的超薄PAAO薄膜。