Graphene Quantum Dots and Phthalocyanines Turn-OFF-ON Photoluminescence Nanosensor for ds-DNA
Supramolecular hybrids of graphene quantum dots (GQDs) and phthalocyanine (Pc) dyes were studied as turn-OFF-ON photoluminescence nanosensors for detection of ds-DNA. Pcs with four (Pc4) and eight (Pc8) positive charges were selected to interact with negatively charged GQDs. The photoluminescence of...
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MDPI AG
2022-05-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/11/1892 |
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| author | Ana M. Santiago Carla I. M. Santos Leandro M. O. Lourenço Inês F. A. Mariz João P. C. Tomé Ermelinda Maçôas |
| author_facet | Ana M. Santiago Carla I. M. Santos Leandro M. O. Lourenço Inês F. A. Mariz João P. C. Tomé Ermelinda Maçôas |
| author_sort | Ana M. Santiago |
| collection | DOAJ |
| description | Supramolecular hybrids of graphene quantum dots (GQDs) and phthalocyanine (Pc) dyes were studied as turn-OFF-ON photoluminescence nanosensors for detection of ds-DNA. Pcs with four (Pc4) and eight (Pc8) positive charges were selected to interact with negatively charged GQDs. The photoluminescence of the GQDs was quenched upon interaction with the Pcs, due to the formation of non-emissive complexes. In the presence of ds-DNA, the Pcs interacted preferentially with the negatively charged ds-DNA, lifting the quenching effect over the photoluminescence of the GQDs and restoring their emission intensity. The best performance as a sensor of ds-DNA was registered for the GQD-Pc8, with a limit of detection (LOD) in the picomolar range. The LOD for GQD-Pc8 was more than one order of magnitude lower and its sensitivity was about a factor of three higher than that of the analogue GQD-Pc4 nanosensor. The sensitivity and selectivity of this simple GQD-Pc8 nanosensor is comparable to those of the more sophisticated carbon-based nanosensors for DNA reported previously. |
| first_indexed | 2024-03-10T01:01:51Z |
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| id | doaj.art-b7e46f9dd70d46888cfd4adaf802a0c7 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T01:01:51Z |
| publishDate | 2022-05-01 |
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| series | Nanomaterials |
| spelling | doaj.art-b7e46f9dd70d46888cfd4adaf802a0c72023-11-23T14:33:54ZengMDPI AGNanomaterials2079-49912022-05-011211189210.3390/nano12111892Graphene Quantum Dots and Phthalocyanines Turn-OFF-ON Photoluminescence Nanosensor for ds-DNAAna M. Santiago0Carla I. M. Santos1Leandro M. O. Lourenço2Inês F. A. Mariz3João P. C. Tomé4Ermelinda Maçôas5Centro de Química Estrutural, Institute of Molecular Science and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, PortugalCentro de Química Estrutural, Institute of Molecular Science and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, PortugalLAQV-REQUIMTE and Department of Chemistry, University of Aveiro, 3810-193 Aveiro, PortugalCentro de Química Estrutural, Institute of Molecular Science and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, PortugalCentro de Química Estrutural, Institute of Molecular Science and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, PortugalCentro de Química Estrutural, Institute of Molecular Science and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, PortugalSupramolecular hybrids of graphene quantum dots (GQDs) and phthalocyanine (Pc) dyes were studied as turn-OFF-ON photoluminescence nanosensors for detection of ds-DNA. Pcs with four (Pc4) and eight (Pc8) positive charges were selected to interact with negatively charged GQDs. The photoluminescence of the GQDs was quenched upon interaction with the Pcs, due to the formation of non-emissive complexes. In the presence of ds-DNA, the Pcs interacted preferentially with the negatively charged ds-DNA, lifting the quenching effect over the photoluminescence of the GQDs and restoring their emission intensity. The best performance as a sensor of ds-DNA was registered for the GQD-Pc8, with a limit of detection (LOD) in the picomolar range. The LOD for GQD-Pc8 was more than one order of magnitude lower and its sensitivity was about a factor of three higher than that of the analogue GQD-Pc4 nanosensor. The sensitivity and selectivity of this simple GQD-Pc8 nanosensor is comparable to those of the more sophisticated carbon-based nanosensors for DNA reported previously.https://www.mdpi.com/2079-4991/12/11/1892sensorgraphene quantum dotphthalocyanineDNAphotoluminescence |
| spellingShingle | Ana M. Santiago Carla I. M. Santos Leandro M. O. Lourenço Inês F. A. Mariz João P. C. Tomé Ermelinda Maçôas Graphene Quantum Dots and Phthalocyanines Turn-OFF-ON Photoluminescence Nanosensor for ds-DNA Nanomaterials sensor graphene quantum dot phthalocyanine DNA photoluminescence |
| title | Graphene Quantum Dots and Phthalocyanines Turn-OFF-ON Photoluminescence Nanosensor for ds-DNA |
| title_full | Graphene Quantum Dots and Phthalocyanines Turn-OFF-ON Photoluminescence Nanosensor for ds-DNA |
| title_fullStr | Graphene Quantum Dots and Phthalocyanines Turn-OFF-ON Photoluminescence Nanosensor for ds-DNA |
| title_full_unstemmed | Graphene Quantum Dots and Phthalocyanines Turn-OFF-ON Photoluminescence Nanosensor for ds-DNA |
| title_short | Graphene Quantum Dots and Phthalocyanines Turn-OFF-ON Photoluminescence Nanosensor for ds-DNA |
| title_sort | graphene quantum dots and phthalocyanines turn off on photoluminescence nanosensor for ds dna |
| topic | sensor graphene quantum dot phthalocyanine DNA photoluminescence |
| url | https://www.mdpi.com/2079-4991/12/11/1892 |
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