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Bezvikonnyi O, Bernard RS, Andruleviciene V, Volyniuk D, Keruckiene R, Vaiciulaityte K, Labanauskas L, Grazulevicius JV. Derivatives of Imidazole and Carbazole as Bifunctional Materials for Organic Light-Emitting Diodes. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8495. [PMID: 36499990 PMCID: PMC9739035 DOI: 10.3390/ma15238495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 11/24/2022] [Accepted: 11/26/2022] [Indexed: 06/17/2023]
Abstract
New derivatives of carbazole and diphenyl imidazole for potential multiple applications were synthesized and investigated. Their properties were studied by thermal, optical, photophysical, electrochemical, and photoelectrical measurements. The compounds exhibited relatively narrow blue light-emission bands, which is favorable for deep-blue electroluminescent devices. The synthesized derivatives of imidazole and carbazole were tested as fluorescent emitters for OLEDs. The device showed deep-blue emissions with CIE color coordinates of (0.16, 0.08) and maximum quantum efficiency of 1.1%. The compounds demonstrated high triplet energy values above 3.0 eV and hole drift mobility exceeding 10-4 cm2/V·s at high electric fields. One of the compounds having two diphenyl imidazole moieties and tert-butyl-substituted carbazolyl groups showed bipolar charge transport with electron drift mobility reaching 10-4 cm2/V·s at electric field of 8 × 105 V/cm. The synthesized compounds were investigated as hosts for green, red and sky-blue phosphorescent OLEDs. The green-, red- and sky-blue-emitting devices demonstrated maximum quantum efficiencies of 8.3%, 6.4% and 7.6%, respectively.
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Affiliation(s)
- Oleksandr Bezvikonnyi
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
- Department of Physics, Faculty of Mathematics and Natural Science, Kaunas University of Technology, Studentų g. 50, LT-51369 Kaunas, Lithuania
| | - Ronit Sebastine Bernard
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Viktorija Andruleviciene
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Dmytro Volyniuk
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Rasa Keruckiene
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Kamile Vaiciulaityte
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Linas Labanauskas
- Center for Physical Sciences and Technology (FTMC), Department of Organic Chemistry, Sauletekio Ave. 3, LT-10257 Vilnius, Lithuania
| | - Juozas Vidas Grazulevicius
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
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Rück V, Cerretani C, Neacşu VA, Liisberg MB, Vosch T. Observation of microsecond luminescence while studying two DNA-stabilized silver nanoclusters emitting in the 800-900 nm range. Phys Chem Chem Phys 2021; 23:13483-13489. [PMID: 34109959 DOI: 10.1039/d1cp01731d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We investigated two DNA-stabilized silver nanoclusters (DNA-AgNCs) that show multiple absorption features in the visible region, and emit around 811 nm (DNA811-AgNC) and 841 nm (DNA841-AgNC). Both DNA-AgNCs have large Stokes shifts and can be efficiently excited with red light. A comparison with the commercially available Atto740 yielded fluorescence quantum yields in the same order of magnitude, but a higher photon output above 800 nm since both DNA-AgNCs are more red-shifted. The study of both DNA-AgNCs also revealed previously unobserved photophysical behavior for this class of emitters. The fluorescence quantum yield and decay time of DNA841-AgNC can be increased upon consecutive heating/cooling cycles. DNA811-AgNC has an additional absorption band around 470 nm, which is parallel in orientation to the lowest energy transition at 640 nm. Furthermore, we observed for the first time a DNA-AgNC population (as part of the DNA811-AgNC sample) with green and near-infrared emissive states with nanosecond and microsecond decay times, respectively. A similar dual emissive DNA-AgNC stabilized by a different 10-base DNA strand is also reported in the manuscript. These two examples highlight the need to investigate the presence of red-shifted microsecond emission for this class of emitters.
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Affiliation(s)
- Vanessa Rück
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
| | - Cecilia Cerretani
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
| | - Vlad A Neacşu
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
| | - Mikkel B Liisberg
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
| | - Tom Vosch
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
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3
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Gambucci M, Zampini G, Quaglia G, Vosch T, Latterini L. Probing the Fluorescence Behavior of DNA‐Stabilized Silver Nanoclusters in the Presence of Biomolecules. CHEMPHOTOCHEM 2021. [DOI: 10.1002/cptc.202000262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Marta Gambucci
- Department of Chemistry, Biology and Biotechnology University of Perugia Via Elce di Sotto, 8 06123 Perugia Italy
| | - Giulia Zampini
- Department of Chemistry, Biology and Biotechnology University of Perugia Via Elce di Sotto, 8 06123 Perugia Italy
| | - Giulia Quaglia
- Department of Chemistry, Biology and Biotechnology University of Perugia Via Elce di Sotto, 8 06123 Perugia Italy
| | - Tom Vosch
- Department of Chemistry University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Loredana Latterini
- Department of Chemistry, Biology and Biotechnology University of Perugia Via Elce di Sotto, 8 06123 Perugia Italy
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Gonzàlez-Rosell A, Cerretani C, Mastracco P, Vosch T, Copp SM. Structure and luminescence of DNA-templated silver clusters. NANOSCALE ADVANCES 2021; 3:1230-1260. [PMID: 36132866 PMCID: PMC9417461 DOI: 10.1039/d0na01005g] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 01/21/2021] [Indexed: 05/05/2023]
Abstract
DNA serves as a versatile template for few-atom silver clusters and their organized self-assembly. These clusters possess unique structural and photophysical properties that are programmed into the DNA template sequence, resulting in a rich palette of fluorophores which hold promise as chemical and biomolecular sensors, biolabels, and nanophotonic elements. Here, we review recent advances in the fundamental understanding of DNA-templated silver clusters (Ag N -DNAs), including the role played by the silver-mediated DNA complexes which are synthetic precursors to Ag N -DNAs, structure-property relations of Ag N -DNAs, and the excited state dynamics leading to fluorescence in these clusters. We also summarize the current understanding of how DNA sequence selects the properties of Ag N -DNAs and how sequence can be harnessed for informed design and for ordered multi-cluster assembly. To catalyze future research, we end with a discussion of several opportunities and challenges, both fundamental and applied, for the Ag N -DNA research community. A comprehensive fundamental understanding of this class of metal cluster fluorophores can provide the basis for rational design and for advancement of their applications in fluorescence-based sensing, biosciences, nanophotonics, and catalysis.
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Affiliation(s)
- Anna Gonzàlez-Rosell
- Department of Materials Science and Engineering, University of California Irvine California 92697-2585 USA
| | - Cecilia Cerretani
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5 2100 Copenhagen Denmark
| | - Peter Mastracco
- Department of Materials Science and Engineering, University of California Irvine California 92697-2585 USA
| | - Tom Vosch
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5 2100 Copenhagen Denmark
| | - Stacy M Copp
- Department of Materials Science and Engineering, University of California Irvine California 92697-2585 USA
- Department of Physics and Astronomy, University of California Irvine California 92697-4575 USA
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5
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Copp SM, Gonzàlez-Rosell A. Large-scale investigation of the effects of nucleobase sequence on fluorescence excitation and Stokes shifts of DNA-stabilized silver clusters. NANOSCALE 2021; 13:4602-4613. [PMID: 33605954 PMCID: PMC8043073 DOI: 10.1039/d0nr08300c] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
DNA-stabilized silver clusters (AgN-DNAs) exhibit diverse sequence-programmed fluorescence, making these tunable nanoclusters promising sensors and bioimaging probes. Recent advances in the understanding of AgN-DNA structures and optical properties have largely relied on detailed characterization of single species isolated by chromatography. Because most AgN-DNAs are unstable under chromatography, such studies do not fully capture the diversity of these clusters. As an alternative method, we use high-throughput synthesis and spectroscopy to measure steady state Stokes shifts of hundreds of AgN-DNAs. Steady state Stokes shift is of interest because its magnitude is determined by energy relaxation processes which may be sensitive to specific cluster geometry, attachment to the DNA template, and structural engagement of solvent molecules. We identify 305 AgN-DNA samples with single-peaked emission and excitation spectra, a characteristic of pure solutions and single emitters, which thus likely contain a dominant emissive AgN-DNA species. Steady state Stokes shifts of these samples vary widely, are in agreement with values reported for purified clusters, and are several times larger than for typical organic dyes. We then examine how DNA sequence selects AgN-DNA excitation energies and Stokes shifts, comment on possible mechanisms for energy relaxation processes in AgN-DNAs, and discuss how differences in AgN-DNA structure and DNA conformation may result in the wide distribution of optical properties observed here. These results may aid computational studies seeking to understand the fluorescence process in AgN-DNAs and the relations of this process to AgN-DNA structure.
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Affiliation(s)
- Stacy M Copp
- Department of Materials Science and Engineering, University of California, Irvine, Irvine, CA 92697-2585, USA. and Department of Physics and Astronomy, University of California, Irvine, Irvine, CA 92697-4575, USA and Department of Chemical and Biomolecular Engineering, University of California, Irvine, Irvine, CA 92697-2580, USA
| | - Anna Gonzàlez-Rosell
- Department of Materials Science and Engineering, University of California, Irvine, Irvine, CA 92697-2585, USA.
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Zhang Y, He C, Petty JT, Kohler B. Time-Resolved Vibrational Fingerprints for Two Silver Cluster-DNA Fluorophores. J Phys Chem Lett 2020; 11:8958-8963. [PMID: 33030904 DOI: 10.1021/acs.jpclett.0c02486] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
DNA-templated silver clusters are chromophores in which the nucleobases encode the cluster spectra and brightness. We describe the coordination environments of two nearly identical Ag106+ clusters that form with 18-nucleotide strands CCCCA CCCCT CCCX TTTT, with X = guanosine and inosine. For the first time, femtosecond time-resolved infrared (TRIR) spectroscopy with visible excitation and mid-infrared probing is used to correlate the response of nucleobase vibrational modes to electronic excitation of the metal cluster. A rich pattern of transient TRIR peaks in the 1400-1720 cm-1 range decays synchronously with the visible emission. Specific infrared signatures associated with the single guanosine/inosine along with a subset of cytidines, but not the thymidines, are observed. These fingerprints suggest that the network of bonds between a silver cluster adduct and its polydentate DNA ligands can be deciphered to rationally tune the coordination and thus spectra of molecular silver chromophores.
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Affiliation(s)
- Yuyuan Zhang
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Chen He
- Department of Chemistry, Furman University, Greenville, South Carolina 29613, United States
| | - Jeffrey T Petty
- Department of Chemistry, Furman University, Greenville, South Carolina 29613, United States
| | - Bern Kohler
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
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Kunwar P, Soman P. Direct Laser Writing of Fluorescent Silver Nanoclusters: A Review of Methods and Applications. ACS APPLIED NANO MATERIALS 2020; 3:7325-7342. [PMID: 33134885 PMCID: PMC7595336 DOI: 10.1021/acsanm.0c01339] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Metal nanoclusters (NCs) are nanomaterials of size of less than 2 nm that exhibit a set of unique physical, chemical, optical, and electronic properties. Because of recent interest in NCs, a great deal of effort is being made to develop synthetic routes that allow control over the NC size, shape, geometry, and properties. Direct laser writing is one of the few synthesis methods that allow the generation of photostable NCs with high quantum yield in a highly controlled fashion. A key advantage of laser-written NCs is the ability to create easy-to-use solid-state devices for a range of applications. This review will present necessary background and recent advances in laser writing of silver NCs and their applications in different solid-state matrixes such as glass, zeolites, and polymer substrate. This topic will be of interest to researchers in the fields of materials science, optics and photonics, chemistry, and biomedical sciences.
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Affiliation(s)
- Puskal Kunwar
- Department of Chemical and Bioengineering, Syracuse University, Syracuse, New York 13244, United States
| | - Pranav Soman
- Department of Chemical and Bioengineering, Syracuse University, Syracuse, New York 13244, United States
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Maity S, Bain D, Patra A. An overview on the current understanding of the photophysical properties of metal nanoclusters and their potential applications. NANOSCALE 2019; 11:22685-22723. [PMID: 31774095 DOI: 10.1039/c9nr07963g] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Photophysics of atomically precise metal nanoclusters (MNCs) is an emerging area of research due to their potential applications in optoelectronics, photovoltaics, sensing, bio-imaging and catalysis. An overview of the recent advances in the photophysical properties of MNCs is presented in this review. To begin with, we illustrate general synthesis methodologies of MNCs using direct reduction, chemical etching, ligand exchange, metal exchange and intercluster reaction. Due to strong quantum confinement, the NCs possess unique electronic properties such as discrete optical absorption, intense photoluminescence (PL), molecular-like electron dynamics and non-linear optical behavior. Discussions have also been carried out to unveil the influence of the core size, nature of ligands, heteroatom doping, and surrounding environments on the optical absorption and photophysical properties of metal clusters. Recent findings reveal that the excited-state dynamics, nonlinear optical properties and aggregation induced emission of metal clusters offer exciting opportunities for potential applications. We discuss briefly about their versatile applications in optoelectronics, sensing, catalysis and bio-imaging. Finally, the future perspective of this research field is given.
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Affiliation(s)
- Subarna Maity
- School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India.
| | - Dipankar Bain
- School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India.
| | - Amitava Patra
- School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India.
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9
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Jana J, Aditya T, Pal T. Achievement of silver-directed enhanced photophysical properties of gold nanoclusters. NEW J CHEM 2019. [DOI: 10.1039/c9nj00977a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Silver-induced enhanced fluorescence of gold nanoclusters through a facile green synthesis.
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Affiliation(s)
- Jayasmita Jana
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur-721302
- India
| | - Teresa Aditya
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur-721302
- India
| | - Tarasankar Pal
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur-721302
- India
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10
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Copp SM, Gorovits A, Swasey SM, Gudibandi S, Bogdanov P, Gwinn EG. Fluorescence Color by Data-Driven Design of Genomic Silver Clusters. ACS NANO 2018; 12:8240-8247. [PMID: 30059609 DOI: 10.1021/acsnano.8b03404] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
DNA nucleobase sequence controls the size of DNA-stabilized silver clusters, leading to their well-known yet little understood sequence-tuned colors. The enormous space of possible DNA sequences for templating clusters has challenged the understanding of how sequence selects cluster properties and has limited the design of applications that employ these clusters. We investigate the genomic role of DNA sequence for fluorescent silver clusters using a data-driven approach. Employing rapid parallel silver cluster synthesis and fluorimetry, we determine the fluorescence spectra of silver cluster products stabilized by 1432 distinct DNA oligomers. By applying pattern recognition algorithms to this large experimental data set, we discover certain DNA base patterns, or "motifs," that correlate to silver clusters with similar fluorescence spectra. These motifs are employed in machine learning classifiers to predictively design DNA template sequences for specific fluorescence color bands. Our method improves selectivity of templates by 330% for silver clusters with peak emission wavelengths beyond 660 nm. The discovered base motifs also provide physical insights into how DNA sequence controls silver cluster size and color. This predictive design approach for color of DNA-stabilized silver clusters exhibits the potential of machine learning and data mining to increase the precision and efficiency of nanomaterials design, even for a soft-matter-inorganic hybrid system characterized by an extremely large parameter space.
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Affiliation(s)
- Stacy M Copp
- Center for Integrated Nanotechnologies , Los Alamos National Laboratory , Los Alamos , New Mexico 87545 , United States
| | - Alexander Gorovits
- Department of Computer Science , University at Albany-SUNY , 1400 Washington Ave. , Albany , New York 12222 , United States
| | | | - Sruthi Gudibandi
- Department of Computer Science , University at Albany-SUNY , 1400 Washington Ave. , Albany , New York 12222 , United States
| | - Petko Bogdanov
- Department of Computer Science , University at Albany-SUNY , 1400 Washington Ave. , Albany , New York 12222 , United States
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11
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Bogh SA, Carro-Temboury MR, Cerretani C, Swasey SM, Copp SM, Gwinn EG, Vosch T. Unusually large Stokes shift for a near-infrared emitting DNA-stabilized silver nanocluster. Methods Appl Fluoresc 2018; 6:024004. [DOI: 10.1088/2050-6120/aaa8bc] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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12
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Bogh S, Cerretani C, Kacenauskaite L, Carro-Temboury MR, Vosch T. Excited-State Relaxation and Förster Resonance Energy Transfer in an Organic Fluorophore/Silver Nanocluster Dyad. ACS OMEGA 2017; 2:4657-4664. [PMID: 31457751 PMCID: PMC6641894 DOI: 10.1021/acsomega.7b00582] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 08/03/2017] [Indexed: 05/21/2023]
Abstract
A single-stranded DNA-based (ssDNA) dyad was constructed comprising 15 silver atoms stabilized by a ssDNA scaffold (DNA-AgNC) and an Alexa 546 fluorophore bound to the 5' end. The Alexa 546 was chosen to function as a Förster resonance energy transfer (FRET) donor for the AgNC. Time-correlated single photon counting (TCSPC) experiments allowed unraveling the excited-state relaxation processes of the purified DNA-AgNC-only system. The TCSPC results revealed slow relaxation dynamics and a red shift of the emission spectrum during the excited-state lifetime. The results from the model systems were needed to understand the more complicated decay pathways present in the collected high-performance liquid chromatography fraction, which contained the dyad (37% of the emissive population). In the dyad system, the FRET efficiency between donor and acceptor was determined to be 94% using TCSPC, yielding a center-to-center distance of 4.6 nm. To date, only limited structural information on DNA-AgNCs is available and the use of TCSPC and FRET can provide information on the center-to-center distance between chromophores and provide positional information in nanostructures composed of AgNCs.
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Affiliation(s)
| | | | - Laura Kacenauskaite
- Nanoscience Center and Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Miguel R. Carro-Temboury
- Nanoscience Center and Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Tom Vosch
- Nanoscience Center and Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
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13
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Cerretani C, Carro-Temboury MR, Krause S, Bogh SA, Vosch T. Temperature dependent excited state relaxation of a red emitting DNA-templated silver nanocluster. Chem Commun (Camb) 2017; 53:12556-12559. [DOI: 10.1039/c7cc06785b] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The average fluorescence decay time of DNA-stabilized silver nanoclusters is temperature dependent and could find applications in nanothermometry.
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Affiliation(s)
- Cecilia Cerretani
- Nanoscience Center and Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- 2100 Copenhagen
- Denmark
| | - Miguel R. Carro-Temboury
- Nanoscience Center and Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- 2100 Copenhagen
- Denmark
| | - Stefan Krause
- Nanoscience Center and Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- 2100 Copenhagen
- Denmark
| | - Sidsel Ammitzbøll Bogh
- Nanoscience Center and Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- 2100 Copenhagen
- Denmark
| | - Tom Vosch
- Nanoscience Center and Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- 2100 Copenhagen
- Denmark
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14
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Copp SM, Schultz D, Swasey SM, Faris A, Gwinn EG. Cluster Plasmonics: Dielectric and Shape Effects on DNA-Stabilized Silver Clusters. NANO LETTERS 2016; 16:3594-9. [PMID: 27187492 DOI: 10.1021/acs.nanolett.6b00723] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
This work investigates the effects of dielectric environment and cluster shape on electronic excitations of fluorescent DNA-stabilized silver clusters, AgN-DNA. We first establish that the longitudinal plasmon wavelengths predicted by classical Mie-Gans (MG) theory agree with previous quantum calculations for excitation wavelengths of linear silver atom chains, even for clusters of just a few atoms. Application of MG theory to AgN-DNA with 400-850 nm cluster excitation wavelengths indicates that these clusters are characterized by a collective excitation process and suggests effective cluster thicknesses of ∼2 silver atoms and aspect ratios of 1.5 to 5. To investigate sensitivity to the surrounding medium, we measure the wavelength shifts produced by addition of glycerol. These are smaller than reported for much larger gold nanoparticles but easily detectable due to narrower line widths, suggesting that AgN-DNA may have potential for fluorescence-reported changes in dielectric environment at length scales of ∼1 nm.
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Affiliation(s)
- Stacy M Copp
- Department of Physics, University of California , Santa Barbara, California 93106-9530, United States
| | - Danielle Schultz
- Department of Chemistry, University of California , Santa Barbara, California 93106-9510, United States
| | - Steven M Swasey
- Department of Chemistry, University of California , Santa Barbara, California 93106-9510, United States
| | - Alexis Faris
- Department of Physics, University of California , Santa Barbara, California 93106-9530, United States
| | - Elisabeth G Gwinn
- Department of Physics, University of California , Santa Barbara, California 93106-9530, United States
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15
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Loukova GV, Milov AA, Vasiliev VP, Minkin VI. Dipole moments and solvatochromism of metal complexes: principle photophysical and theoretical approach. Phys Chem Chem Phys 2016; 18:17822-6. [DOI: 10.1039/c6cp03348b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For metal-based compounds, the ground- and excited-state dipole moments and the difference thereof are obtained both experimentally and theoretically.
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Affiliation(s)
- Galina V. Loukova
- Institute of Problems of Chemical Physics
- Russian Academy of Sciences
- Chernogolovka
- Russian Federation
| | - Alexey A. Milov
- Southern Scientific Center
- Russian Academy of Sciences
- Rostov-on-Don
- Russian Federation
| | - Vladimir P. Vasiliev
- Institute of Problems of Chemical Physics
- Russian Academy of Sciences
- Chernogolovka
- Russian Federation
| | - Vladimir I. Minkin
- Southern Scientific Center
- Russian Academy of Sciences
- Rostov-on-Don
- Russian Federation
- Southern Federal University
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