阳极氧化铝/碳复合薄膜:含碳成分的提取和表征

Katsiaryna Chernyakova, Ieva Matulaitienė, Tatjana Charkova, Giedrė Grincienė, Meda Jurevičiūtė, Aurimas Kopūstas, Arūnas Jagminas, Renata Karpicz
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引用次数: 0

摘要

氧化铝/碳复合材料是一种现代纳米材料,可用作吸附剂、催化剂、催化剂载体、超级电容器和燃料电池的电极材料。在其他方法中,铝阳极氧化法是生产具有可控特性的阳极氧化铝/碳复合材料相当快速和廉价的方法。本研究使用七钼酸铵(碳含量约为 5.0%)或草酸(碳含量为 3.4%)添加剂,在甲酸中进行铝阳极氧化,获得了富碳阳极氧化铝膜的形态和成分。阳极氧化铝薄膜在 400-650 纳米波长范围内具有较宽的蓝色荧光 (FL),在约 490 纳米波长处达到最大值。490 纳米。七钼酸铵和草酸添加剂的荧光衰减为非指数衰减,平均寿命分别为 1.54 和 1.59 ns。由于在硫酸中获得的样品(即不含碳的样品)在 400-650 nm 波长范围内检测不到 FL,因此可以断定含碳夹杂物是造成薄膜 FL 特性的原因。将初始样品溶解在热的盐酸水溶液中,然后进行透析以提取含碳成分。结果表明,溶液中含有直径为 20-25 纳米的无定形碳纳米颗粒。在 280-450 nm 的激发波长下,碳纳米颗粒还表现出与激发相关的发射行为,平均寿命为 7.25-8.04 ns,具体取决于初始薄膜的成分。碳纳米粒子 FL 是由碳纳米粒子(CNPs)的核心及其表面的各种发射中心(如羰基、羧基和羟基)引起的。由于碳纳米管可能是检测技术的理想候选材料,因此用活体 COS-7 哺乳动物细胞进行了生物相容性测试,结果显示对活体细胞的负面影响极小。
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Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component
Alumina/carbon composites are modern nanomaterials used as adsorbents, catalysts, catalyst supports, supercapacitors, and electrode materials for fuel cells. Among other methods, aluminum anodizing is fairly fast and inexpensive for producing anodic alumina/carbon composites with controllable properties. In the present study, the morphology and composition of carbon-enriched anodic alumina films were obtained during aluminum anodic oxidation in formic acid with ammonium heptamolybdate (C content is ca. 5.0 mass%) or oxalic acid (C content 3.4 mass%) additives. The anodic alumina films have a wide blue fluorescence (FL) in the 400–650 nm wavelength range with a maximum at ca. 490 nm. The FL decay is nonexponential and has an average lifetime of 1.54 and 1.59 ns for ammonium heptamolybdate and oxalic acid additives, respectively. As samples obtained in sulfuric acid (i.e. without carbon) do not possess detectable FL in the 400–650 nm wavelength range, it was concluded that carbon-containing inclusions are responsible for the FL properties of the films. The initial samples were dissolved in the hot aqueous HCl solution and then dialyzed to extract the carbon-containing component. It was shown that the solutions contain nanoparticles of amorphous carbon with a 20–25 nm diameter. Carbon nanoparticles also exhibit an excitation-dependent emission behavior at 280–450 nm excitation wavelengths with average lifetimes of 7.25–8.04 ns, depending on the composition of the initial film. Carbon nanoparticle FL is caused by the core of carbon nanoparticles (CNPs) and various emission centers on their surface, such as carbonyl, carboxyl, and hydroxyl groups. As CNPs could be exceptional candidates for detection technologies, the biocompatibility assays were performed with living COS-7 mammalian cells, showing a minimal negative impact on the living cells.
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