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 proper...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | JPhys Materials |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2515-7639/ad3b6f |
| _version_ | 1827278688025051136 |
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| author | Katsiaryna Chernyakova Ieva Matulaitienė Tatjana Charkova Giedrė Grincienė Meda Jurevičiūtė Aurimas Kopūstas Arūnas Jagminas Renata Karpicz |
| author_facet | Katsiaryna Chernyakova Ieva Matulaitienė Tatjana Charkova Giedrė Grincienė Meda Jurevičiūtė Aurimas Kopūstas Arūnas Jagminas Renata Karpicz |
| author_sort | Katsiaryna Chernyakova |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-24T08:04:13Z |
| format | Article |
| id | doaj.art-c4ae3096ca8e4b199645fff33f9479a9 |
| institution | Directory Open Access Journal |
| issn | 2515-7639 |
| language | English |
| last_indexed | 2024-04-24T08:04:13Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | JPhys Materials |
| spelling | doaj.art-c4ae3096ca8e4b199645fff33f9479a92024-04-17T12:55:39ZengIOP PublishingJPhys Materials2515-76392024-01-017202501110.1088/2515-7639/ad3b6fAnodic alumina/carbon composite films: extraction and characterization of the carbon-containing componentKatsiaryna Chernyakova0https://orcid.org/0000-0002-6616-4353Ieva Matulaitienė1https://orcid.org/0000-0001-7664-2331Tatjana Charkova2https://orcid.org/0000-0002-2043-9024Giedrė Grincienė3https://orcid.org/0000-0002-9830-6301Meda Jurevičiūtė4https://orcid.org/0000-0002-5754-8603Aurimas Kopūstas5https://orcid.org/0000-0002-2972-1851Arūnas Jagminas6https://orcid.org/0000-0003-0191-8588Renata Karpicz7https://orcid.org/0000-0001-5884-4538Centre for Physical Sciences and Technology , Sauletekio av. 3, LT-10257 Vilnius, LithuaniaCentre for Physical Sciences and Technology , Sauletekio av. 3, LT-10257 Vilnius, LithuaniaCentre for Physical Sciences and Technology , Sauletekio av. 3, LT-10257 Vilnius, LithuaniaCentre for Physical Sciences and Technology , Sauletekio av. 3, LT-10257 Vilnius, LithuaniaVilnius University, Life Sciences Center, Institute of Biotechnology , Sauletekio av. 7, LT-10257 Vilnius, LithuaniaCentre for Physical Sciences and Technology , Sauletekio av. 3, LT-10257 Vilnius, Lithuania; Vilnius University, Life Sciences Center, Institute of Biotechnology , Sauletekio av. 7, LT-10257 Vilnius, LithuaniaCentre for Physical Sciences and Technology , Sauletekio av. 3, LT-10257 Vilnius, LithuaniaCentre for Physical Sciences and Technology , Sauletekio av. 3, LT-10257 Vilnius, LithuaniaAlumina/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.https://doi.org/10.1088/2515-7639/ad3b6fanodic aluminaformic acidamorphous carbon nanoparticlesfluorescencebiocompatibility |
| spellingShingle | Katsiaryna Chernyakova Ieva Matulaitienė Tatjana Charkova Giedrė Grincienė Meda Jurevičiūtė Aurimas Kopūstas Arūnas Jagminas Renata Karpicz Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component JPhys Materials anodic alumina formic acid amorphous carbon nanoparticles fluorescence biocompatibility |
| title | Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component |
| title_full | Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component |
| title_fullStr | Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component |
| title_full_unstemmed | Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component |
| title_short | Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component |
| title_sort | anodic alumina carbon composite films extraction and characterization of the carbon containing component |
| topic | anodic alumina formic acid amorphous carbon nanoparticles fluorescence biocompatibility |
| url | https://doi.org/10.1088/2515-7639/ad3b6f |
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