Stable Fluorescence of Eu<sup>3+</sup> Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition
We designed and realized highly fluorescent nanostructures composed of Eu<sup>3+</sup> complexes under a protein coating. The nanostructured material, confirmed by photo-induced force microscopy (PiFM), includes a bottom fluorescent layer and an upper protein layer. The bottom fluorescen...
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MDPI AG
2021-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/9/2462 |
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| author | Yue Zhao Ziyu Yao Christopher D. Snow Yanan Xu Yao Wang Dan Xiu Laurence A. Belfiore Jianguo Tang |
| author_facet | Yue Zhao Ziyu Yao Christopher D. Snow Yanan Xu Yao Wang Dan Xiu Laurence A. Belfiore Jianguo Tang |
| author_sort | Yue Zhao |
| collection | DOAJ |
| description | We designed and realized highly fluorescent nanostructures composed of Eu<sup>3+</sup> complexes under a protein coating. The nanostructured material, confirmed by photo-induced force microscopy (PiFM), includes a bottom fluorescent layer and an upper protein layer. The bottom fluorescent layer includes Eu<sup>3+</sup> that is coordinated by 1,10-phenanthroline (Phen) and oleic acid (O). The complete complexes (OEu<sup>3+</sup>Phen) formed higher-order structures with diameter 40–150 nm. Distinctive nanoscale striations reminiscent of fingerprints were observed with a high-resolution transmission electron microscope (HRTEM). Stable fluorescence was increased by the addition of Eu<sup>3+</sup> coordinated by Phen and 2-thenoyltrifluoroacetone (TTA), and confirmed by fluorescence spectroscopy. A satisfactory result was the observation of red Eu<sup>3+</sup> complex emission through a protein coating layer with a fluorescence microscope. Lanthanide nanostructures of these types might ultimately prove useful for biometric applications in the context of human and non-human tissues. The significant innovations of this work include: (1) the structural set-up of the fluorescence image embedded under protein “skin”; and (2) dual confirmations of nanotopography and unique nanofingerprints under PiFM and under TEM, respectively. |
| first_indexed | 2024-03-10T07:22:24Z |
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| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T07:22:24Z |
| publishDate | 2021-09-01 |
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| series | Nanomaterials |
| spelling | doaj.art-a16dd5e3e7b14846b6af1a6677b1628b2023-11-22T14:32:57ZengMDPI AGNanomaterials2079-49912021-09-01119246210.3390/nano11092462Stable Fluorescence of Eu<sup>3+</sup> Complex Nanostructures Beneath a Protein Skin for Potential Biometric RecognitionYue Zhao0Ziyu Yao1Christopher D. Snow2Yanan Xu3Yao Wang4Dan Xiu5Laurence A. Belfiore6Jianguo Tang7Institute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, ChinaInstitute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, ChinaDepartment of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO 80523, USAInstitute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, ChinaInstitute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, ChinaInstitute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, ChinaInstitute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, ChinaInstitute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, ChinaWe designed and realized highly fluorescent nanostructures composed of Eu<sup>3+</sup> complexes under a protein coating. The nanostructured material, confirmed by photo-induced force microscopy (PiFM), includes a bottom fluorescent layer and an upper protein layer. The bottom fluorescent layer includes Eu<sup>3+</sup> that is coordinated by 1,10-phenanthroline (Phen) and oleic acid (O). The complete complexes (OEu<sup>3+</sup>Phen) formed higher-order structures with diameter 40–150 nm. Distinctive nanoscale striations reminiscent of fingerprints were observed with a high-resolution transmission electron microscope (HRTEM). Stable fluorescence was increased by the addition of Eu<sup>3+</sup> coordinated by Phen and 2-thenoyltrifluoroacetone (TTA), and confirmed by fluorescence spectroscopy. A satisfactory result was the observation of red Eu<sup>3+</sup> complex emission through a protein coating layer with a fluorescence microscope. Lanthanide nanostructures of these types might ultimately prove useful for biometric applications in the context of human and non-human tissues. The significant innovations of this work include: (1) the structural set-up of the fluorescence image embedded under protein “skin”; and (2) dual confirmations of nanotopography and unique nanofingerprints under PiFM and under TEM, respectively.https://www.mdpi.com/2079-4991/11/9/2462Eu complexoleic acidfingerprintsPiFMbiometric recognition |
| spellingShingle | Yue Zhao Ziyu Yao Christopher D. Snow Yanan Xu Yao Wang Dan Xiu Laurence A. Belfiore Jianguo Tang Stable Fluorescence of Eu<sup>3+</sup> Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition Nanomaterials Eu complex oleic acid fingerprints PiFM biometric recognition |
| title | Stable Fluorescence of Eu<sup>3+</sup> Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition |
| title_full | Stable Fluorescence of Eu<sup>3+</sup> Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition |
| title_fullStr | Stable Fluorescence of Eu<sup>3+</sup> Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition |
| title_full_unstemmed | Stable Fluorescence of Eu<sup>3+</sup> Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition |
| title_short | Stable Fluorescence of Eu<sup>3+</sup> Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition |
| title_sort | stable fluorescence of eu sup 3 sup complex nanostructures beneath a protein skin for potential biometric recognition |
| topic | Eu complex oleic acid fingerprints PiFM biometric recognition |
| url | https://www.mdpi.com/2079-4991/11/9/2462 |
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