Jagminas A, Žalnėravičius R, Rėza A, Paškevičius A, Selskienė A
State Research Institute Center for Physical Sciences and Technology, Institute of Chemistry, Gostauto 9, LT-01108 Vilnius, Lithuania.
Dalton Trans. 2015 Mar 14;44(10):4512-9. doi: 10.1039/c4dt03644a.
In this study, conditions for the fabrication of extremely thin and flexible anodic films decorated with silver nanowire arrays by alternating current treatments for the finishing of high purity and commercial aluminium foils were developed. For characterization of these porous films with a thickness of ≤1.0 μm and encased silver species, inductively coupled plasma optical emission spectroscopy, X-ray diffraction and field emission scanning electron microscopy were used. Variable angle spectroscopic ellipsometry in the wavelength range of 200-1700 nm was also used to determine the influence of the deposited Ag content and the film thickness on the optical constants (n, k) of the fabricated alumina films. It is shown that due to surprisingly low k values of nano-Ag-in-alumina films in the visible and near IR regions these films could be applied as transparent films with an extremely low refractive index. In addition, the antimicrobial activity of the obtained films was assessed for the as-deposited and fully-encapsulated silver nanowire arrays against several widespread fungi and bacteria. The results obtained from in vitro tests indicated that the as-formed Ag-in-alumina films containing ≥19 μg cm(-2) of silver possessed antimicrobial properties and could be promising as foodstuff packaging materials.
在本研究中，开发了通过交流电处理对高纯度和商业铝箔进行表面处理，制备装饰有银纳米线阵列的极薄且柔性阳极膜的条件。为了表征这些厚度≤1.0μm且包裹有银物质的多孔膜，使用了电感耦合等离子体发射光谱法、X射线衍射和场发射扫描电子显微镜。还使用了波长范围为200 - 1700nm的可变角度光谱椭偏仪来确定沉积的银含量和膜厚度对所制备氧化铝膜光学常数（n，k）的影响。结果表明，由于纳米银掺杂氧化铝膜在可见光和近红外区域具有极低的k值，这些膜可作为具有极低折射率的透明膜应用。此外，评估了所制备膜中沉积态和完全包裹的银纳米线阵列对几种常见真菌和细菌的抗菌活性。体外测试结果表明，含银量≥19μg cm(-2)的原位形成的银掺杂氧化铝膜具有抗菌性能，有望作为食品包装材料。
