Change search
Link to record
Permanent link

Direct link
Publications (10 of 33) Show all publications
Al-Maqdasi, Z., Dobryden, I., Almqvist, N. & Joffe, R. (2023). Apparent Elastic Modulus of Polyethylene and its Nanocomposites Measured at Different Scales. In: Brian G. Falzon; Conor McCarthy (Ed.), ICCM 2023 - Proceedings of the 2023 23rd International Conference on Composite Materials: . Paper presented at 23rd International Conference on Composite Materials (ICCM 2023), Belfast, United Kingdom, July 30-August 4, 2023. Queen's University Belfast
Open this publication in new window or tab >>Apparent Elastic Modulus of Polyethylene and its Nanocomposites Measured at Different Scales
2023 (English)In: ICCM 2023 - Proceedings of the 2023 23rd International Conference on Composite Materials / [ed] Brian G. Falzon; Conor McCarthy, Queen's University Belfast , 2023Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
Queen's University Belfast, 2023
Series
ICCM International Conferences on Composite Materials
National Category
Polymer Technologies
Research subject
Polymeric Composite Materials; Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-105054 (URN)2-s2.0-85187565668 (Scopus ID)
Conference
23rd International Conference on Composite Materials (ICCM 2023), Belfast, United Kingdom, July 30-August 4, 2023
Available from: 2024-04-11 Created: 2024-04-11 Last updated: 2024-04-11Bibliographically approved
Nguyen, M., Kraft, U., Tan, W. L., Dobryden, I., Broch, K., Zhang, W., . . . Sirringhaus, H. (2023). Improving OFF‐State Bias‐Stress Stability in High‐Mobility Conjugated Polymer Transistors with an Anti‐Solvent Treatment. Advanced Materials, 35(16), Article ID 2205377.
Open this publication in new window or tab >>Improving OFF‐State Bias‐Stress Stability in High‐Mobility Conjugated Polymer Transistors with an Anti‐Solvent Treatment
Show others...
2023 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 35, no 16, article id 2205377Article in journal (Refereed) Published
Abstract [en]

Conjugated polymer field-effect transistors are emerging as an enabling technology for flexible electronics due to their excellent mechanical properties combined with sufficiently high charge carrier mobilities and compatibility with large-area, low-temperature processing. However, their electrical stability remains a concern. ON-state (accumulation mode) bias-stress instabilities in organic semiconductors have been widely studied, and multiple mitigation strategies have been suggested. In contrast, OFF-state (depletion mode) bias-stress instabilities remain poorly understood despite being crucial for many applications in which the transistors are held in their OFF-state for most of the time. Here, we present a simple method of using an anti-solvent treatment to achieve significant improvements in OFF-state bias-stress and environmental stability as well as general device performance for one of the best performing polymers, solution-processable indacenodithiophene-co-benzothiadiazole (IDT-BT). IDT-BT is weakly crystalline, and we attribute the notable improvements to an anti-solvent-induced, increased degree of crystallinity, resulting in a lower probability of electron trapping and the removal of charge traps. Our work highlights the importance of the microstructure in weakly crystalline polymer films and offers a simple processing strategy for achieving the reliability required for applications in flexible electronics.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
Keywords
bias-stress effects, electron trapping, organic field-effect transistors, solvent treatments, stability
National Category
Condensed Matter Physics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-94372 (URN)10.1002/adma.202205377 (DOI)000947000600001 ()36373490 (PubMedID)2-s2.0-85149933640 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-07-05 (hanlid);

Funder: Engineering and Physical Sciences Research Council (EP/R031894/1); EPSRC Centre for Doctoral Training (EP/L015889/1); EPSRC (EP/S030662/1)

Available from: 2022-11-30 Created: 2022-11-30 Last updated: 2023-07-05Bibliographically approved
Dobryden, I., Korolkov, V. V., Lemaur, V., Waldrip, M., Un, H.-I., Simatos, D., . . . Venkateshvaran, D. (2022). Dynamic self-stabilization in the electronic and nanomechanical properties of an organic polymer semiconductor. Nature Communications, 13(1), Article ID 3076.
Open this publication in new window or tab >>Dynamic self-stabilization in the electronic and nanomechanical properties of an organic polymer semiconductor
Show others...
2022 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 13, no 1, article id 3076Article in journal (Refereed) Published
Abstract [en]

The field of organic electronics has profited from the discovery of new conjugated semiconducting polymers that have molecular backbones which exhibit resilience to conformational fluctuations, accompanied by charge carrier mobilities that routinely cross the 1 cm2/Vs benchmark. One such polymer is indacenodithiophene-co-benzothiadiazole. Previously understood to be lacking in microstructural order, we show here direct evidence of nanosized domains of high order in its thin films. We also demonstrate that its device-based high-performance electrical and thermoelectric properties are not intrinsic but undergo rapid stabilization following a burst of ambient air exposure. The polymer’s nanomechanical properties equilibrate on longer timescales owing to an orthogonal mechanism; the gradual sweating-out of residual low molecular weight solvent molecules from its surface. We snapshot the quasistatic temporal evolution of the electrical, thermoelectric and nanomechanical properties of this prototypical organic semiconductor and investigate the subtleties which play on competing timescales. Our study documents the untold and often overlooked story of a polymer device’s dynamic evolution toward stability.

Place, publisher, year, edition, pages
Springer Nature, 2022
National Category
Other Materials Engineering Atom and Molecular Physics and Optics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-91053 (URN)10.1038/s41467-022-30801-x (DOI)000805202900030 ()35654891 (PubMedID)2-s2.0-85131157947 (Scopus ID)
Funder
EU, Horizon 2020, 964677
Note

Validerad;2022;Nivå 2;2022-06-13 (joosat);

Funder: Sensor CDT and the Engineering and Physical Sciences Research Council (EP/L015889/1)

Available from: 2022-06-13 Created: 2022-06-13 Last updated: 2023-05-09Bibliographically approved
Gilzad Kohan, M., Dobryden, I., Forchheimer, D., Concina, I. & Vomiero, A. (2022). In-depth photocarrier dynamics in a barrier variable iron-oxide and vertically aligned reduced-graphene oxide composite. NPJ 2D MATERIALS AND APPLICATIONS, 6(1), Article ID 57.
Open this publication in new window or tab >>In-depth photocarrier dynamics in a barrier variable iron-oxide and vertically aligned reduced-graphene oxide composite
Show others...
2022 (English)In: NPJ 2D MATERIALS AND APPLICATIONS, E-ISSN 2397-7132, Vol. 6, no 1, article id 57Article in journal (Refereed) Published
Abstract [en]

A key requirement for semiconductors operating in light-harvesting devices, is to efficiently convert the absorbed photons to electronic excitations while accommodating low loss pathways for the photogenerated carrier’s transport. The quality of this process corresponds to different relaxation phenomena, yet primarily it corresponds to minimized thermalization of photoexcited carriers and maximum transfer of electron-hole pairs in the bulk of semiconductor. However, several semiconductors, while providing a suitable platform for light-harvesting applications, pose intrinsic low carrier diffusion length of photoexcited carriers. Here we report a system based on a vertical network of reduced graphene oxide (rGO) embedded in a thin-film structure of iron oxide semiconductor, intended to exploit fast electron transport in rGO to increase the photoexcited carrier transfer from the bulk of the semiconductor to rGO and then to the external circuit. Using intermodulation conductive force microscopy, we locally monitored the fluctuation of current output, which is the prime indication of successful charge transfer from photoexcited semiconductor to rGO and efficient charge collection from the bulk of the semiconductor. We reveal the fundamental properties of vertical rGO and semiconductor junction in light-harvesting systems that enable the design of new promising materials for broad-band optical applications.

Place, publisher, year, edition, pages
Springer Nature, 2022
National Category
Physical Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-93220 (URN)10.1038/s41699-022-00333-5 (DOI)000849458700001 ()2-s2.0-85137588426 (Scopus ID)
Funder
Luleå University of TechnologyThe Kempe FoundationsEU, Horizon 2020, 65400Knut and Alice Wallenberg FoundationVinnova
Note

Validerad;2022;Nivå 2;2022-09-27 (joosat);

Funder: Swedish Foundations Consolidator Fellowship

Available from: 2022-09-27 Created: 2022-09-27 Last updated: 2022-09-27Bibliographically approved
Panchal, V., Dobryden, I., Hangen, U. D., Simatos, D., Spalek, L. J., Jacobs, I. E., . . . Venkateshvaran, D. (2022). Mechanical Properties of Organic Electronic Polymers on the Nanoscale. Advanced Electronic Materials, 8(3), Article ID 2101019.
Open this publication in new window or tab >>Mechanical Properties of Organic Electronic Polymers on the Nanoscale
Show others...
2022 (English)In: Advanced Electronic Materials, E-ISSN 2199-160X, Vol. 8, no 3, article id 2101019Article in journal (Refereed) Published
Abstract [en]

Organic semiconducting polymers have attractive electronic, optical, and mechanical properties that make them materials of choice for large area flexible electronic devices. In these devices, the electronically active polymer components are micrometers in size, and sport negligible performance degradation upon bending the centimeter-scale flexible substrate onto which they are integrated. A closer look at the mechanical properties of the polymers, on the grain-scale and smaller, is not necessary in large area electronic applications. In emerging micromechanical and electromechanical applications where the organic polymer elements are flexed on length scales spanning their own micron-sized active areas, it becomes important to characterize the uniformity of their mechanical properties on the nanoscale. In this work, the authors use two precision nanomechanical characterization techniques, namely, atomic force microscope based PeakForce quantitative nanomechanical mapping (PF-QNM) and nanoindentation-based dynamical mechanical analysis (nano-DMA), to compare the modulus and the viscoelastic properties of organic polymers used routinely in organic electronics. They quantitatively demonstrate that the semiconducting near-amorphous organic polymer indacenodithiophene-co-benzothiadiazole (C16-IDTBT) has a higher carrier mobility, lower modulus, and greater nanoscale modulus areal uniformity compared to the semiconducting semicrystalline organic polymer poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (C14-PBTTT). Modulus homogeneity appears intrinsic to C16-IDTBT but can be improved in C14-PBTTT upon chemical doping. 

Place, publisher, year, edition, pages
John Wiley & Sons, 2022
National Category
Condensed Matter Physics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-88163 (URN)10.1002/aelm.202101019 (DOI)000722458700001 ()2-s2.0-85119858392 (Scopus ID)
Note

Validerad;2022;Nivå 2;2022-04-13 (sofila);

Funder: Royal Society of London (no. URF\R1\201590); Engineering and Physical Sciences Research Council (EPSRC) (no. EP/L015889/1); Belgian National Fund for Scientific Research (FNRS)

Available from: 2021-12-02 Created: 2021-12-02 Last updated: 2022-04-19Bibliographically approved
Ishak, M. I., Dobryden, I., Claesson, P. M., Briscoe, W. H. & Su, B. (2021). Friction at nanopillared polymer surfaces beyond Amontons’ laws: Stick-slip amplitude coefficient (SSAC) and multiparametric nanotribological properties. Journal of Colloid and Interface Science, 583, 414-424
Open this publication in new window or tab >>Friction at nanopillared polymer surfaces beyond Amontons’ laws: Stick-slip amplitude coefficient (SSAC) and multiparametric nanotribological properties
Show others...
2021 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 583, p. 414-424Article in journal (Refereed) Published
Abstract [en]

Frictional and nanomechanical properties of nanostructured polymer surfaces are important to their technological and biomedical applications. In this work, poly(ethylene terephthalate) (PET) surfaces with a periodic distribution of well-defined nanopillars were fabricated through an anodization/embossing process. The apparent surface energy of the nanopillared surfaces was evaluated using the Fowkes acid-base approach, and the surface morphology was characterized using scanning electron microscope (SEM) and atomic force microscope (AFM). The normal and lateral forces between a silica microparticle and these surfaces were quantified using colloidal probe atomic force microscopy (CP-AFM). The friction-load relationship followed Amonton’s first law, and the friction coefficient appeared to scale linearly with the nanopillar height. Furthermore, all the nanopillared surfaces showed pronounced frictional instabilities compared to the smooth sliding friction loop on the flat control. Performing the stick-slip amplitude coefficient (SSAC) analysis, we found a correlation between the frictional instabilities and the nanopillars density, pull-off force and work of adhesion. We have summarised the dependence of the nanotribological properties on such nanopillared surfaces on five relevant parameters, i.e. pull-off force fp, Amontons’ friction coefficient μ, RMS roughness Rq. stick-slip amplitude friction coefficient SSAC, and work of adhesion between the substrate and water Wadh in a radar chart. Whilst demonstrating the complexity of the frictional behaviour of nanopillared polymer surfaces, our results show that analyses of multiparametric nanotribological properties of nanostructured surfaces should go beyond classic Amontons’ laws, with the SSAC more representative of the frictional properties compared to the friction coefficient.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Nanopillars, Contact mechanics, Friction, Stick–slip amplitude coefficient (SSAC), Amontons' laws of friction, Nanostructured surfaces, PET, Nanotribology
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-80931 (URN)10.1016/j.jcis.2020.09.038 (DOI)000595500200014 ()33011410 (PubMedID)2-s2.0-85091963223 (Scopus ID)
Note

Validerad;2022;Nivå 2;2022-01-24 (johcin)

Available from: 2020-09-25 Created: 2020-09-25 Last updated: 2022-01-24Bibliographically approved
Dobryden, I., Steponavičiu̅tė, M., Hedman, D., Klimkevičius, V., Makuška, R., Dėdinaitė, A., . . . Claesson, P. M. (2021). Local Wear of Catechol-Containing Diblock Copolymer Layers: Wear Volume, Stick–Slip, and Nanomechanical Changes. The Journal of Physical Chemistry C, 125(38), 21277-21292
Open this publication in new window or tab >>Local Wear of Catechol-Containing Diblock Copolymer Layers: Wear Volume, Stick–Slip, and Nanomechanical Changes
Show others...
2021 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 125, no 38, p. 21277-21292Article in journal (Refereed) Published
Abstract [en]

Polymers containing catechol groups have gained a large interest, as they mimic an essential feature of mussel adhesive proteins that allow strong binding to a large variety of surfaces under water. This feature has made this class of polymers interesting for surface modification purposes, as layer functionalities can be introduced by a simple adsorption process, where the catechol groups should provide a strong anchoring to the surface. In this work, we utilize an AFM-based method to evaluate the wear resistance of such polymer layers in water and compare it with that offered by electrostatically driven adsorption. We pay particular attention to two block copolymer systems where the anchoring group in one case is an uncharged catechol-containing block and in the other case a positively charged and catechol-containing block. The wear resistance is evaluated in terms of wear volume, and here, we compare with data for similar copolymers with statistical distribution of the catechol groups. Monitoring of nanomechanical properties provides an alternative way of illustrating the effect of wear, and we use modeling to show that the stiffness, as probed by an AFM tip, of the soft layer residing on a hard substrate increases as the thickness of the layer decreases. The stick–slip characteristics are also evaluated.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021
National Category
Physical Chemistry
Research subject
Experimental Physics; Applied Physics
Identifiers
urn:nbn:se:ltu:diva-87536 (URN)10.1021/acs.jpcc.1c06859 (DOI)000704295900056 ()2-s2.0-85116679792 (Scopus ID)
Note

Validerad;2021;Nivå 2;2021-10-18 (beamah);

Forskningsfinansiär: National Natural Science Foundation of China (21902098)

Available from: 2021-10-18 Created: 2021-10-18 Last updated: 2021-10-18Bibliographically approved
Dobryden, I., Borgani, R., Rigoni, F., Ghamgosar, P., Concina, I., Almqvist, N. & Vomiero, A. (2021). Nanoscale characterization of an all-oxide core-shell nanorod heterojunction using intermodulation atomic force microscopy (AFM) methods. Nanoscale Advances, 3(15), 4388-4394
Open this publication in new window or tab >>Nanoscale characterization of an all-oxide core-shell nanorod heterojunction using intermodulation atomic force microscopy (AFM) methods
Show others...
2021 (English)In: Nanoscale Advances, E-ISSN 2516-0230, Vol. 3, no 15, p. 4388-4394Article in journal (Refereed) Published
Abstract [en]

The electrical properties of an all-oxide core–shell ZnO–Co3O4 nanorod heterojunction were studied in the dark and under UV-vis illumination. The contact potential difference and current distribution maps were obtained utilizing new methods in dynamic multifrequency atomic force microscopy (AFM) such as electrostatic and conductive intermodulation AFM. Light irradiation modified the electrical properties of the nanorod heterojunction. The new techniques are able to follow the instantaneous local variation of the photocurrent, giving a two-dimensional (2D) map of the current–voltage curves and correlating the electrical and morphological features of the heterostructured core–shell nanorods.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2021
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-85199 (URN)10.1039/d1na00319d (DOI)000657788200001 ()2-s2.0-85111592982 (Scopus ID)
Funder
The Kempe FoundationsKnut and Alice Wallenberg Foundation
Note

Validerad;2021;Nivå 2;2021-08-12 (alebob)

Available from: 2021-06-10 Created: 2021-06-10 Last updated: 2023-09-05Bibliographically approved
Li, G., Varga, I., Kardos, A., Dobryden, I. & Claesson, P. M. (2021). Nanoscale Mechanical Properties of Core–Shell-like Poly-NIPAm Microgel Particles: Effect of Temperature and Cross-Linking Density. Journal of Physical Chemistry B, 125(34), 9860-9869
Open this publication in new window or tab >>Nanoscale Mechanical Properties of Core–Shell-like Poly-NIPAm Microgel Particles: Effect of Temperature and Cross-Linking Density
Show others...
2021 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 125, no 34, p. 9860-9869Article in journal (Refereed) Published
Abstract [en]

Poly-NIPAm microgel particles with two different cross-linking densities were prepared with the classical batch polymerization process. These particles were adsorbed onto modified silica surfaces, and their nanomechanical properties were measured by means of atomic force microscopy. It was found that these particles have a hard core–soft shell structure both below and above the volume transition temperature. The core–shell-like structure appears due to a higher reaction rate of the cross-linker compared to that of the monomer, leading to depletion of cross-linker in the shell region. The microgel beads with lower average cross-linking density were found to be less stiff below the volume transition temperature than the microgel with higher cross-linking density. Increasing the temperature further to just above the volume transition temperature led to lower stiffness of the more highly cross-linked microgel compared to its less cross-linked counterpart. This effect is explained with the more gradual deswelling with temperature for the more cross-linked microgel particles. This phenomenon was confirmed by dynamic light scattering measurements in the bulk phase, which showed that the larger cross-linking density microgel showed a more gradual collapse in aqueous solution as the temperature was increased. 

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021
National Category
Physical Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-86944 (URN)10.1021/acs.jpcb.1c04173 (DOI)000693398300021 ()34428041 (PubMedID)2-s2.0-85114450235 (Scopus ID)
Note

Validerad;2022;Nivå 2;2022-01-24 (johcin);

 Forskningsfinansiär: China Scholarship Council; Hungarian National Research, Development and Innovation Office (NKFIH K116629); National Research Development and Innovation Office (TKP2020-IKA-05)

Available from: 2021-09-01 Created: 2021-09-01 Last updated: 2022-01-24Bibliographically approved
Wojas, N. A., Dobryden, I., Wallqvist, V., Swerin, A., Järn, M., Schoelkopf, J., . . . Claesson, P. M. (2021). Nanoscale Wear and Mechanical Properties of Calcite: Effects of Stearic Acid Modification and Water Vapor. Langmuir, 37(32), 9826-9837
Open this publication in new window or tab >>Nanoscale Wear and Mechanical Properties of Calcite: Effects of Stearic Acid Modification and Water Vapor
Show others...
2021 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 37, no 32, p. 9826-9837Article in journal (Refereed) Published
Abstract [en]

Understanding the wear of mineral fillers is crucial for controlling industrial processes, and in the present work, we examine the wear resistance and nanomechanical properties of bare calcite and stearic acid-modified calcite surfaces under dry and humid conditions at the nanoscale. Measurements under different loads allow us to probe the situation in the absence and presence of abrasive wear. The sliding motion is in general characterized by irregular stick-slip events that at higher loads lead to abrasion of the brittle calcite surface. Bare calcite is hydrophilic, and under humid conditions, a thin water layer is present on the surface. This water layer does not affect the friction force. However, it slightly decreases the wear depth and strongly influences the distribution of wear particles. In contrast, stearic acid-modified surfaces are hydrophobic. Nevertheless, humidity affects the wear characteristics by decreasing the binding strength of stearic acid at higher humidity. A complete monolayer coverage of calcite by stearic acid results in a significant reduction in wear but only a moderate reduction in friction forces at low humidity and no reduction at 75% relative humidity (RH). Thus, our data suggest that the wear reduction does not result from a lowering of the friction force but rather from an increased ductility of the surface region as offered by the stearic acid layer. An incomplete monolayer of stearic acid on the calcite surface provides no reduction in wear regardless of the RH investigated. Clearly, the wear properties of modified calcite surfaces depend crucially on the packing density of the surface modifier and also on the air humidity. 

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021
National Category
Materials Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-86688 (URN)10.1021/acs.langmuir.1c01390 (DOI)000687082000020 ()34355909 (PubMedID)2-s2.0-85113655268 (Scopus ID)
Note

Validerad;2022;Nivå 2;2022-01-24 (johcin);

Forskningsfinansiär: Omya International AG

Available from: 2021-08-17 Created: 2021-08-17 Last updated: 2022-01-24Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6877-9282

Search in DiVA

Show all publications