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Moonitz SA, Shepard N, Noriega R. Multimodal spectroscopic investigation of the conformation and local environment of biomolecules at an electrified interface. J Mater Chem B 2020; 8:7024-7030. [PMID: 32716450 DOI: 10.1039/d0tb01158d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The complex and dynamic interfacial regions between biological samples and electronic components pose many challenges for characterization, including their evolution over multiple temporal and spatial scales. Spectroscopic probes of buried interfaces employing mid-infrared plasmon resonances and time-resolved fluorescence detection in the visible range are used to study the properties of polypeptides adsorbed at the surface of a working electrode. Information from these complementary spectroscopic probes reveals the interplay of solvation, electric fields, and ion concentration on their resulting macromolecular conformations.
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Affiliation(s)
- Sasha A Moonitz
- University of Utah, Department of Chemistry, 315 S. 1400 E, Salt Lake City, UT 84112, USA.
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Mendez-Gonzalez D, Calderón OG, Melle S, González-Izquierdo J, Bañares L, López-Díaz D, Velázquez MM, López-Cabarcos E, Rubio-Retama J, Laurenti M. Contribution of resonance energy transfer to the luminescence quenching of upconversion nanoparticles with graphene oxide. J Colloid Interface Sci 2020; 575:119-129. [PMID: 32361044 DOI: 10.1016/j.jcis.2020.04.076] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 03/31/2020] [Accepted: 04/19/2020] [Indexed: 02/04/2023]
Abstract
Upconversion nanoparticles (UCNP) are increasingly used due to their advantages over conventional fluorophores, and their use as resonance energy transfer (RET) donors has permitted their application as biosensors when they are combined with appropriate RET acceptors such as graphene oxide (GO). However, there is a lack of knowledge about the design and influence that GO composition produces over the quenching of these nanoparticles that in turn will define their performance as sensors. In this work, we have analysed the total quenching efficiency, as well as the actual values corresponding to the RET process between UCNPs and GO sheets with three different chemical compositions. Our findings indicate that excitation and emission absorption by GO sheets are the major contributor to the observed luminescence quenching in these systems. This challenges the general assumption that UCNPs luminescence deactivation by GO is caused by RET. Furthermore, RET efficiency has been theoretically calculated by means of a semiclassical model considering the different nonradiative energy transfer rates from each Er3+ ion to the GO thin film. These theoretical results highlight the relevance of the relative positions of the Er3+ ions inside the UCNP with respect to the GO sheet in order to explain the RET-induced efficiency measurements.
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Affiliation(s)
- Diego Mendez-Gonzalez
- Department of Chemistry in Pharmaceutical Sciences, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Oscar G Calderón
- Departament of Optics, Universidad Complutense de Madrid, 28037 Madrid, Spain.
| | - Sonia Melle
- Departament of Optics, Universidad Complutense de Madrid, 28037 Madrid, Spain
| | - Jesús González-Izquierdo
- Department of Physical Chemistry I and Center for Ultrafast Lasers, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Luis Bañares
- Department of Physical Chemistry I and Center for Ultrafast Lasers, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - David López-Díaz
- Department of Physical Chemistry, Universidad de Salamanca, 37008 Salamanca, Spain; Department of Analytical, Physical Chemistry and Chemical engineering, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain
| | - M Mercedes Velázquez
- Department of Physical Chemistry, Universidad de Salamanca, 37008 Salamanca, Spain
| | - Enrique López-Cabarcos
- Department of Chemistry in Pharmaceutical Sciences, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Jorge Rubio-Retama
- Department of Chemistry in Pharmaceutical Sciences, Universidad Complutense de Madrid, 28040 Madrid, Spain; Instituto Ramón y Cajal de Investigación Sanitaria, Hospital Universitario Ramón y Cajal, 28034 Madrid, Spain
| | - Marco Laurenti
- Department of Chemistry in Pharmaceutical Sciences, Universidad Complutense de Madrid, 28040 Madrid, Spain; Instituto de Ciencia de Materiales de Madrid, c/Sor Juana Inés de la Cruz, Cantoblanco 28049, Madrid, Spain; Instituto Ramón y Cajal de Investigación Sanitaria, Hospital Universitario Ramón y Cajal, 28034 Madrid, Spain.
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