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Idebohn, V., Linguerri, R., Cornetta, L. M., Olsson, E., Wallner, M., Squibb, R. J., . . . Feifel, R. (2023). Symmetry breaking in core-valence double ionisation of allene. Communications Chemistry, 6(1), Article ID 137.
Open this publication in new window or tab >>Symmetry breaking in core-valence double ionisation of allene
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2023 (English)In: Communications Chemistry, E-ISSN 2399-3669, Vol. 6, no 1, article id 137Article in journal (Refereed) Published
Abstract [en]

Allene serves as a model to study multiple ionization of organic molecules. Here, the authors use synchrotron radiation-based multi-particle coincidence techniques and high-level ab initio calculations to propose a simple physical model to elucidate the symmetry breaking in core-valence double ionization of allene. Conventional electron spectroscopy is an established one-electron-at-the-time method for revealing the electronic structure and dynamics of either valence or inner shell ionized systems. By combining an electron-electron coincidence technique with the use of soft X-radiation we have measured a double ionisation spectrum of the allene molecule in which one electron is removed from a C1s core orbital and one from a valence orbital, well beyond Siegbahns Electron-Spectroscopy-for-Chemical-Analysis method. This core-valence double ionisation spectrum shows the effect of symmetry breaking in an extraordinary way, when the core electron is ejected from one of the two outer carbon atoms. To explain the spectrum we present a new theoretical approach combining the benefits of a full self-consistent field approach with those of perturbation methods and multi-configurational techniques, thus establishing a powerful tool to reveal molecular orbital symmetry breaking on such an organic molecule, going beyond Lowdins standard definition of electron correlation.

Place, publisher, year, edition, pages
Springer Nature, 2023
National Category
Theoretical Chemistry
Identifiers
urn:nbn:se:kth:diva-332206 (URN)10.1038/s42004-023-00934-1 (DOI)001021486700002 ()37400533 (PubMedID)2-s2.0-85163928721 (Scopus ID)
Note

QC 20230721

Available from: 2023-07-21 Created: 2023-07-21 Last updated: 2023-07-21Bibliographically approved
Moghadam, R. Z., Dizagi, H. R., Ågren, H. & Ehsani, M. H. (2023). Understanding the effect of Mn2+ on Yb3+/Er3+ co-doped NaYF4 upconversion and obtaining the optimal combination of these tridoping. Scientific Reports, 13(1), Article ID 17556.
Open this publication in new window or tab >>Understanding the effect of Mn2+ on Yb3+/Er3+ co-doped NaYF4 upconversion and obtaining the optimal combination of these tridoping
2023 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 13, no 1, article id 17556Article in journal (Refereed) Published
Abstract [en]

In this work, we investigated in detail the upconversion properties of several types of nanoparticles, including NaYF4:5%Yb3+/30%Mn2+, NaYF4:40%Mn2+/x%Yb3+ (x% = 1, 5, 10, 20, 30, and 40), NaYF4:2%Er3+/x%Mn2+ (x% = 20, 30, 40, 50, 60, and 70), NaYF4:40%Mn2+/x%Er3+ (x% = 1, 2, 5, and 10), and NaYF4:40%Mn2+/1%Yb3+/x%Er3+ (x% = 0, 2, 5, and 10). We studied their upconversion emission under 980 nm excitation in both pulsed and continuous wave modes at different synthesis temperatures. The nanoparticles were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), and photoluminescence (PL) spectroscopy. The doping of Yb3+ and Mn2+ ions resulted in the nanoparticles assuming cubic and hexagonal crystal structures. The emission intensity increased (106.4 (a.u.*10(3)) to 334.4(a.u.*10(3))) with increasing synthesis temperature from 120 to 140 C-degrees, while a sharp decrease was observed when the synthesis temperature was increased to 200 C-degrees. The gradual decrease in peak intensity with increasing Mn2+ concentration from 20 to 70% was attributed to energy transfer from Mn2+ to Yb3+. In NaYF4:Mn2+/Yb3+/Er3+ UCNPs, increasing the Er3+ concentration from 0 to 10% led to the disappearance of the blue, orange, and green emission bands. The intense upconversion luminescence pattern with high spatial resolution indicates excellent potential for applications in displays, biological sensors, photodetectors, and solar energy converters.

Place, publisher, year, edition, pages
Springer Nature, 2023
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-340454 (URN)10.1038/s41598-023-44947-1 (DOI)001087127100005 ()37845290 (PubMedID)2-s2.0-85174273393 (Scopus ID)
Note

QC 20231205

Available from: 2023-12-05 Created: 2023-12-05 Last updated: 2023-12-05Bibliographically approved
Wang, T., Zheng, D., An, B., Liu, Y., Ren, T., Ågren, H., . . . Ahlquist, M. S. G. (2022). Dual-ionic imidazolium salts to promote synthesis of cyclic carbonates at atmospheric pressure. Green Energy and Environment, 7(6), 1327-1339
Open this publication in new window or tab >>Dual-ionic imidazolium salts to promote synthesis of cyclic carbonates at atmospheric pressure
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2022 (English)In: Green Energy and Environment, ISSN 2096-2797, Vol. 7, no 6, p. 1327-1339Article in journal (Refereed) Published
Abstract [en]

Novel dual-ionic imidazolium salts are shown to display excellent catalytic activity for cycloaddition of carbon dioxide and epoxides under room temperature and atmospheric pressure (0.1 MPa) without any solvent and co-catalyst leading to 96.1% product yield. It can be reused five times to keep the product yield over 90%. These intriguing results are attributed to a new reaction mechanism, which is supported by theoretical calculations along with the measurements of 13C NMR spectrum and Fourier transform infrared spectroscopy (FT-IR). The excellent catalytic activity can be traced to a CO2-philic group along with an electrophilic hydrogen atom. Our work shows that incorporation of CO2-philic group is an feasible pathway to develop the new efficient ionic liquids.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Atmospheric pressure, CO2-Philic group, Dual-ionic imidazolium salts, New mechanism, Room temperature, Atoms, Carbon dioxide, Fourier transform infrared spectroscopy, Ionic liquids, Nuclear magnetic resonance spectroscopy, Salts, 13C NMR spectrum, Fourier transform infra red (FTIR) spectroscopy, Hydrogen atoms, Imidazolium salt, Measurements of, Reaction mechanism, Synthesis of cyclic carbonates, Theoretical calculations, Catalyst activity
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-308514 (URN)10.1016/j.gee.2021.02.011 (DOI)000886643300016 ()2-s2.0-85103387034 (Scopus ID)
Note

QC 20230503

Available from: 2022-02-09 Created: 2022-02-09 Last updated: 2024-03-18Bibliographically approved
Zhang, H., Sun, S., Shang, X., Guo, B., Li, X., Chen, X., . . . Fu, S. (2022). Ultrafast photonics applications of emerging 2D-Xenes beyond graphene. Nanophotonics, 11(7), 1261-1284
Open this publication in new window or tab >>Ultrafast photonics applications of emerging 2D-Xenes beyond graphene
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2022 (English)In: Nanophotonics, ISSN 2192-8614, Vol. 11, no 7, p. 1261-1284Article in journal (Refereed) Published
Abstract [en]

Driven by new two-dimensional materials, great changes and progress have taken place in the field of ultrafast photonics in recent years. Among them, the emerging single element two-dimensional materials (Xenes) have also received much attention due to their special physical and photoelectric properties including tunable broadband nonlinear saturable absorption, ultrafast carrier recovery rate, and ultrashort recovery time. In this review, the preparation methods of Xenes and various integration strategies are detailedly introduced at first. Then, we summarize the outcomes achieved by Xenes-based (beyond graphene) fiber lasers and make classifications based on the characteristics of output pulses according to the materials characterization and nonlinear optical absorption properties. Finally, an outlook of the future opportunities and challenges of ultrafast photonics devices based on Xenes and other 2D materials are highlighted, and we hope this review will promote their extensive applications in ultrafast photonics technology. 

Place, publisher, year, edition, pages
Walter de Gruyter GmbH, 2022
Keywords
saturable absorber, single element 2D materials, ultrafast applications, Xenes, Fiber lasers, Light absorption, Nonlinear optics, Optical properties, Photonics, Saturable absorbers, Semiconductor quantum wells, Photoelectric property, Photonic application, Saturable absorption, Single element, Single element 2d material, Tunables, Two-dimensional materials, Ultra-fast photonics, Graphene
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-322578 (URN)10.1515/nanoph-2022-0045 (DOI)000772204800001 ()2-s2.0-85127857283 (Scopus ID)
Note

QC 20221222

Available from: 2022-12-22 Created: 2022-12-22 Last updated: 2022-12-22Bibliographically approved
Karaush-Karmazin, N. N., Baryshnikov, G. V., Ågren, H. & Minaev, B. F. (2021). Furans and Their Benzo Derivatives: Structure. In: Comprehensive Heterocyclic Chemistry IV: (pp. 190-232). Elsevier BV
Open this publication in new window or tab >>Furans and Their Benzo Derivatives: Structure
2021 (English)In: Comprehensive Heterocyclic Chemistry IV, Elsevier BV , 2021, p. 190-232Chapter in book (Other academic)
Abstract [en]

This article provides an overview of the results of 10-year (2008–2018) studies on the structure and properties of furans and their benzo derivatives. Particular attention is paid to strategies to improve stability of furan-containing systems by introducing p-block inorganic elements and by furan annelation with other conjugated aromatic systems. We also show that furans and benzofurans represent advantageous alternatives to thiophenes and thiophene-based building units toward the design and synthesis of novel “green” polymeric materials with desired properties for optoelectronic applications.

Place, publisher, year, edition, pages
Elsevier BV, 2021
Keywords
Aromaticity, Band structure, Band-gap engineering, Benzoannelation, Bifuran-imide, Bowl-to-bowl inversion, Bridged benzofurans, DFT calculations, Gauge-including magnetically induced currents, Oligofurans, Oxa[n]circulenes, S- and d-block metals, Strain energy, π-Stacking interactions
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-329092 (URN)10.1016/B978-0-12-409547-2.14768-7 (DOI)2-s2.0-85143568621 (Scopus ID)
Note

Part of book ISBN 978-012818656-5 978-012818655-8

QC 20230615

Available from: 2023-06-15 Created: 2023-06-15 Last updated: 2023-07-23Bibliographically approved
Karaush-Karmazin, N. N., Baryshnikov, G. V., Kuklin, A. V., Saykova, D. I., Ågren, H. & Minaev, B. F. (2021). Impact of molecular and packing structure on the charge-transport properties of hetero[8]circulenes. Journal of Materials Chemistry C, 9(4), 1451-1466
Open this publication in new window or tab >>Impact of molecular and packing structure on the charge-transport properties of hetero[8]circulenes
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2021 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 9, no 4, p. 1451-1466Article in journal (Refereed) Published
Abstract [en]

In organic photovoltaic cells, absorption of light leads to the formation of excitons, which then diffuse to the donor/acceptor interface to generate photocurrent. The distance from which excitons can reach the interface is constrained by the exciton diffusion length, which has been difficult to quantitatively model or predict due to structural and energetic disorder. Modern non-fullerene acceptors have been shown to possess exceptionally large diffusion lengths, along with well-defined molecular and packing structures, suggesting that a predictive framework for materials design and computational screening may be possible. In this work, we demonstrate that the large diffusion coefficient recently observed in an archetypical non-fullerene acceptor, IDIC, can be accurately quantified using density functional theory, and that the low energetic disorder means that the crystal structure provides a meaningful starting point to understand exciton motion in thin films. Accounting for the short- and long-range excitonic interactions, as well as spatiotemporal disorder, we demonstrate that both Monte-Carlo techniques and a simple sum-over-rates method can accurately predict experimental values for exciton diffusivity and diffusion length. The simplicity and accuracy of this approach are directly linked to the structural order of these materials, and an electronic coupling profile that is unusually resilient to thermal distortions - highlighting the potential of the sum-over-rates method for computational materials screening. Moreover, we show that these factors, combined with the low reorganisation energy and significant long-range electronic coupling, lead to diffusion rates that approach the upper limit of incoherent energy transfer and long diffusion lengths that relieve constraints on organic solar cell device architectures.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2021
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-292283 (URN)10.1039/d0tc03674a (DOI)000634615400037 ()2-s2.0-85100460926 (Scopus ID)
Note

QC 20211110

Available from: 2021-03-31 Created: 2021-03-31 Last updated: 2022-06-25Bibliographically approved
Mao, L., Dun, S., Ren, H., Jiang, J., Guo, X., Huang, F., . . . Ågren, H. (2021). Introducing chenodeoxycholic acid coadsorbent and strong electron-withdrawing group in indoline dyes to design high-performance solar cells: A remarkable theoretical improvement. Journal of Materials Chemistry C, 9(17), 5800-5807
Open this publication in new window or tab >>Introducing chenodeoxycholic acid coadsorbent and strong electron-withdrawing group in indoline dyes to design high-performance solar cells: A remarkable theoretical improvement
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2021 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 9, no 17, p. 5800-5807Article in journal (Refereed) Published
Abstract [en]

The addition of coadsorbents and the introduction of electron-withdrawing groups in dye sensitizers are considered feasible strategies for improving the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). However, facile and precise predictions of the influence of these two strategies on their photovoltaic properties, including PCE, are challenging. In this contribution, we studied a known D-A-π-A indoline dye WS-2 adsorbed on a TiO2 anode represented by a supercell model. The PCE of this dye was evaluated to be between 9.69% and 13.70%, depending on the supercell representation, compared with an experimental value of 8.55%. The PCE could be increased to 16.39% on a moderate supercell by adding chenodeoxycholic acid (CDCA) as a coadsorbent. Such an enhancement could be ascribed to the intermolecular interaction between WS-2 and CDCA, suppressing excessively high dye coverage and thereby resulting in a remarkable increase in the open-circuit voltage. Based on WS-2, a new molecule WS-2a was rationally designed by substituting the benzothiadiazole moiety of WS-2 with a stronger electron-withdrawing thienyl-diketopyrrolopyrrole group. Consequently, the maximum absorption band showed a large red-shift from 522 to 638 nm, broadening the spectral response into the near-infrared region. A higher PCE of 16.62% was obtained for WS-2a. Moreover, the coadsorption of WS-2a and CDCA onto the TiO2 supercell achieved the best photovoltaic efficiency with a value as high as 24.15%. Therefore, the present study quantitatively reveals the impact of the coadsorbent and electron-withdrawing groups on the optoelectronic properties of dyes, which opens a new avenue to design high-efficiency D-A-π-A-structured organic sensitizers for promising DSSC applications. A discussion on the qualification of these results is given.

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC), 2021
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-309869 (URN)10.1039/d0tc05665k (DOI)000641424000001 ()2-s2.0-85105594995 (Scopus ID)
Note

QC 20220314

Available from: 2022-03-14 Created: 2022-03-14 Last updated: 2022-06-25Bibliographically approved
Li, Z., Wang, Y., Baryshnikov, G. V., Shen, S., Zhang, M., Zou, Q., . . . Zhu, L. (2021). Lighting up solid states using a rubber. Nature Communications, 12(1), Article ID 908.
Open this publication in new window or tab >>Lighting up solid states using a rubber
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2021 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 12, no 1, article id 908Article in journal (Refereed) Published
Abstract [en]

It is crucial and desirable to develop green and high-efficient strategies to regulate solid-state structures and their related material properties. However, relative to solution, it is more difficult to break and generate chemical bonds in solid states. In this work, a rubbing-induced photoluminescence on the solid states of ortho-pyridinil phenol family was achieved. This rubbing response relied on an accurately designed topochemical tautomerism, where a negative charge, exactly provided by the triboelectric effect of a rubber, can induce a proton transfer in a double H-bonded dimeric structure. This process instantaneously led to a bright-form tautomer that can be stabilized in the solid-state settings, leading to an up to over 450-fold increase of the fluorescent quantum yield of the materials. The property can be repeatedly used due to the reversibility of the tautomerism, enabling encrypted applications. Moreover, a further modification to the structure can be accomplished to achieve different properties, opening up more possibilities for the design of new-generation smart materials. Changes in molecular properties due to stimuli response are critically important for the development of new materials. However, most processes are slow or inefficient in the solid state. Here the authors demonstrate property switching in the solid state using a rubbing-induced tautomerism in multiple hydrogen-bonded donor-acceptor couples.

Place, publisher, year, edition, pages
Springer Nature, 2021
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-291779 (URN)10.1038/s41467-021-21253-w (DOI)000620139600009 ()33568677 (PubMedID)2-s2.0-85100986135 (Scopus ID)
Note

QC 20210323

Available from: 2021-03-23 Created: 2021-03-23 Last updated: 2023-03-28Bibliographically approved
Wu, H., Baryshnikov, G. V., Kuklin, A. V., Minaev, B. F., Wu, B., Gu, L., . . . Zhao, Y. (2021). Multidimensional Structure Conformation of Persulfurated Benzene for Highly Efficient Phosphorescence. ACS Applied Materials and Interfaces, 13(1), 1314-1322
Open this publication in new window or tab >>Multidimensional Structure Conformation of Persulfurated Benzene for Highly Efficient Phosphorescence
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2021 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 13, no 1, p. 1314-1322Article in journal (Refereed) Published
Abstract [en]

It is a challenge to acquire, realize, and comprehend highly emissive phosphorescent molecules. Herein, we report that, using persulfurated benzene compounds as models, phosphorescence can be strongly enhanced through the modification of molecular conformation and crystal growth conditions. By varying the peripheral groups in these compounds, we were able to control their molecular conformation and crystal growth mode, leading to one- (1D), two- (2D), and three-dimensional (3D) crystal morphologies. Two kinds of typical molecular conformations were separately obtained in these crystals through substituent group control or the solvent effect. Importantly, a symmetrical 3,3-conformer exhibits that a planar central benzene ring prefers a 3D-type crystal growth mode, demonstrating high phosphorescence efficiency. Such outcome is attributed to the strong crystal protection effect of the 3D crystal and the bright global minimum (GM) boat-like T-1 state of the symmetrical 3,3-conformer. The conformation studies further reveal small deformation of the inner benzene ring in both singlet and triplet states. The GM boat-like T-1 state is indicated by theoretical calculations, which is far away from the conical intersection (CI) point between the S-0 and T-1 potential energy surfaces. Meanwhile, the small energy gap between S-1 and T-1 states and the considerable spin-orbit coupling matrix elements allow an efficient population of the T-1 state. Combined with the crystal protection and conformation effect, the 3,3- conformer crystal shows high phosphorescence efficiency. The unsymmetrical 2,4-conformer conformation with the twisted central benzene ring leads to 1D or 2D crystal growth mode, which has a weak crystal protection effect. In addition, the unsymmetrical conformation has a dark GM T-1 state that is very close to the T-1-S-0 CI point, implying an efficient nonradiative T-1-S-0 quenching. Thus, weak phosphorescence was observed from the unsymmetrical conformation. This study provides an insight for the development of highly emissive phosphorescent materials.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2021
Keywords
crystal engineering, molecular conformation, persulfurated benzene, phosphorescence, supramolecular chemistry
National Category
Organic Chemistry
Identifiers
urn:nbn:se:kth:diva-291930 (URN)10.1021/acsami.0c16338 (DOI)000611066000128 ()33373196 (PubMedID)2-s2.0-85099103108 (Scopus ID)
Note

QC 20210329

Available from: 2021-03-29 Created: 2021-03-29 Last updated: 2022-06-25Bibliographically approved
Zhao, X., Chen, H., Li, H., Hu, B., Kuklin, A. V., Baryshnikov, G., . . . Zhang, H. (2021). Persistent radical pairs trigger nano-gold to highly efficiently and highly selectively drive the value-added conversion of nitroaromatics. Chem Catalysis, 1(5), 1118-1132
Open this publication in new window or tab >>Persistent radical pairs trigger nano-gold to highly efficiently and highly selectively drive the value-added conversion of nitroaromatics
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2021 (English)In: Chem Catalysis, ISSN 2667-1107, Vol. 1, no 5, p. 1118-1132Article in journal (Refereed) Published
Abstract [en]

The development of advanced catalyst materials capable of efficiently capturing solar energy to drive the beneficial conversion of chemicals is a key part of the blueprint for “liquid sunlight.” Here, highly dispersed ultrafine nano-Au (B/TPTH3@Au) was anchored in situ on B/TPTH3 formed by alternate cross-linking of closo-[B12H12]2− and protonated 2,4,6-tris(4-pyridyl)-1,3,5-triazine. B/TPTH3@Au is an outstanding heterogeneous photocatalyst that converts low-value-added nitroaromatics into high-value-added azoaromatics. Compared with the slow kinetics of previous catalysts, the time required for the conversion of nitroaromatics to azoaromatics driven by B/TPTH3@Au is reduced by at least 10 times. These improvements could be derived from the synergy between the carrier B/TPTH3 (as a stable radical pair) and the nano-gold, including continuous electron transport in the functional carrier B/TPTH3 and the anchoring of highly dispersed ultrafine nano-Au with a strong localized surface plasmon resonance effect.

Place, publisher, year, edition, pages
Elsevier BV, 2021
Keywords
azoaromatics, nano-gold, nitroaromatics, photocatalytic, radicals, SDG3: Good health and well-being, SDG9: Industry innovation and infrastructure
National Category
Theoretical Chemistry
Identifiers
urn:nbn:se:kth:diva-316106 (URN)10.1016/j.checat.2021.08.017 (DOI)000901295900017 ()2-s2.0-85115735755 (Scopus ID)
Note

QC 20220823

Available from: 2022-08-22 Created: 2022-08-22 Last updated: 2023-09-21Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-1763-9383

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