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Publications (10 of 32) Show all publications
Loiko, P., Maria Serres, J., Delekta, S. S., Kifle, E., Boguslawski, J., Kowalczyk, M., . . . Östling, M. (2018). Inkjet-printing of graphene saturable absorbers for similar to 2 mu m bulk and waveguide lasers. Optical Materials Express, 8(9), 2803-2814
Open this publication in new window or tab >>Inkjet-printing of graphene saturable absorbers for similar to 2 mu m bulk and waveguide lasers
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2018 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 8, no 9, p. 2803-2814Article in journal (Refereed) Published
Abstract [en]

A technique for inkjet-printing of graphene saturable absorbers (SAs) for similar to 2-mu m bulk and waveguide lasers is presented. Based on distillation-assisted solvent exchange to fabricate high-concentration graphene inks, this technique is capable of producing few-layer graphene films of arbitrary shape. Absorption saturation of graphene printed on glass is demonstrated at similar to 1.56 mu m for picosecond and femtosecond pulses indicating a large fraction of the saturable losses. Inkjet-printed transmission-type graphene SAs are applied in passively Q-switched nanosecond thulium (Tm) microchip and planar waveguide lasers. The Tm microchip laser generates 136 ns / 1.2 mu J pulses at 1917 nm with a repetition rate of 0.37 MHz with a Q-switching conversion efficiency reaching 65%. The planar waveguide laser generates 98 ns / 21 nJ pulses at 1834 nm at a repetition rate in the MHz-range. The inkjet-printing technique is promising for production of patterned SAs for waveguide lasers.

Place, publisher, year, edition, pages
Optical Society of America, 2018
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-235113 (URN)10.1364/OME.8.002803 (DOI)000443314600037 ()2-s2.0-85052662930 (Scopus ID)
Note

QC 20180919

Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-09-19Bibliographically approved
Loiko, P., Maria Serres, J., Delekta, S. S., Kifle, E., Mateos, X., Baranov, A., . . . Östling, M. (2017). Inkjet-Printing of Graphene Saturable Absorbers for similar to 2 mu m Bulk and Waveguide Lasers. In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO): . Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA. IEEE
Open this publication in new window or tab >>Inkjet-Printing of Graphene Saturable Absorbers for similar to 2 mu m Bulk and Waveguide Lasers
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2017 (English)In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

We report on inkjet-printing of graphene saturable absorbers (SAs) suitable for passive Q-switching of similar to 2-mu m bulk and waveguide lasers. Using graphene-SA in a microchip Tm:KLu(WO4)(2) laser, 1.2 mu J/136 ns pulses are generated at 1917 nm.

Place, publisher, year, edition, pages
IEEE, 2017
Series
Conference on Lasers and Electro-Optics, ISSN 2160-9020
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-226251 (URN)000427296202314 ()978-1-9435-8027-9 (ISBN)
Conference
Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved
Li, J., Delekta, S. S., Zhang, P., Yang, S., Lohe, M. R., Zhuang, X., . . . Östling, M. (2017). Scalable Fabrication and Integration of Graphene Microsupercapacitors through Full Inkjet Printing. ACS Nano, 11(8), 8249-8256
Open this publication in new window or tab >>Scalable Fabrication and Integration of Graphene Microsupercapacitors through Full Inkjet Printing
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2017 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 11, no 8, p. 8249-8256Article in journal (Refereed) Published
Abstract [en]

A simple full-inkjet-printing technique is developed for the scalable fabrication of graphene-based microsupercapacitors (MSCs) on various substrates. High-performance graphene inks are formulated by integrating the electrochemically exfoliated graphene with a solvent exchange technique to reliably print graphene interdigitated electrodes with tunable geometry and "thickness. Along with the printed polyelectrolyte, poly(4-styrenesulfonic acid), the fully printed graphene-based MSCs attain the highest areal capacitance of similar to 0.7 mF/cm(2), substantially advancing the state-of-art of all-solid-state MSCs with printed graphene electrodes. The full printing solution enables scalable fabrication of MSCs and effective connection of them in parallel and/or in series at various scales. Remarkably, more than 100 devices have been connected to form large-scale MSC arrays as power banks on both silicon wafers and Kapton. Without any extra protection or encapsulation, the MSC arrays can be reliably charged up to 12 V and retain the performance even 8 months after fabrication.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-214515 (URN)10.1021/acsnano.7b03354 (DOI)000408520900076 ()28682595 (PubMedID)2-s2.0-85028458614 (Scopus ID)
Note

QC 20170929

Available from: 2017-09-29 Created: 2017-09-29 Last updated: 2017-09-29Bibliographically approved
Lobov, G., Zhao, Y., Marinins, A., Yan, M., Li, J., Sugunan, A., . . . Popov, S. (2016). Dynamic Manipulation of Optical Anisotropy of Suspended Poly-3-hexylthiophene Nanofibers. Advanced Optical Materials, 4(10), 1651-1656
Open this publication in new window or tab >>Dynamic Manipulation of Optical Anisotropy of Suspended Poly-3-hexylthiophene Nanofibers
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2016 (English)In: Advanced Optical Materials, ISSN 2195-1071, Vol. 4, no 10, p. 1651-1656Article in journal (Refereed) Published
Abstract [en]

Poly-3-hexylthiophene (P3HT) nanofibers are 1D crystalline semiconducting nanostructures, which are known for their application in photovoltaics. Due to the internal arrangement, P3HT nanofibers possess optical anisotropy, which can be enhanced on a macroscale if nanofibers are aligned. Alternating electric field, applied to a solution with dispersed nanofibers, causes their alignment and serves as a method to produce solid layers with ordered nanofibers. The transmission ellipsometry measurements demonstrate the dichroic absorption and birefringence of ordered nanofibers in a wide spectral range of 400–1700 nm. Moreover, the length of nanofibers has a crucial impact on their degree of alignment. Using electric birefringence technique, it is shown that external electric field applied to the solution with P3HT nanofibers can cause direct birefringence modulation. Dynamic alignment of dispersed nanofibers changes the refractive index of the solution and, therefore, the polarization of transmitted light. A reversible reorientation of nanofibers is organized by using a quadrupole configuration of poling electrodes. With further development, the described method can be used in the area of active optical fiber components, lab-on-chip or sensors. It also reveals the potential of 1D conducting polymeric structures as objects whose highly anisotropic properties can be implemented in electro-optical applications.​

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2016
Keywords
anisotropic optical materials, electrooptical materials, nanofibers, optical properties, polymers, Anisotropy, Birefringence, Electric fields, Optical anisotropy, Optical fibers, Refractive index, Alternating electric field, Electric birefringence, Electro-optical applications, External electric field, Quadrupole configuration, Semiconducting nanostructures, Transmission ellipsometry
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-195418 (URN)10.1002/adom.201600226 (DOI)2-s2.0-84979574389 (Scopus ID)
Note

QC 20161128

Available from: 2016-11-28 Created: 2016-11-03 Last updated: 2017-12-29Bibliographically approved
Östling, M., Smith, A., Vaziri, S., Delekta, S. S., Li, J. & Lemme, M. C. (2016). Emerging graphene device technologies. In: Emerging Nanomaterials and Devices: . Paper presented at Symposium on Emerging Nanomaterials and Devices - PRiME 2016/230th ECS Meeting, Honolulu, United States, 2 October 2016 through 7 October 2016 (pp. 17-35). Electrochemical Society, 75(13), Article ID 13.
Open this publication in new window or tab >>Emerging graphene device technologies
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2016 (English)In: Emerging Nanomaterials and Devices, Electrochemical Society, 2016, Vol. 75, no 13, p. 17-35, article id 13Conference paper, Published paper (Refereed)
Abstract [en]

Graphene has a wide range of attractive electrical and mechanical properties. This unique blend of properties make it a good candidate for emerging and future device technologies, such as sensors, high frequency electronics, and energy storage devices. In this review paper, each of the aforementioned applications will be explored along with demonstrations of their operating principles. Specifically, we explore pressure and humidity sensors, graphene base transistor for high frequency applications, and supercapacitors. In addition, this paper provides a general overview of these graphene technologies and, in the case of pressure and humidity sensors, benchmarking against other competing technologies. This paper further shows possible and prospective paths that are suitable for future graphene research to take.

Place, publisher, year, edition, pages
Electrochemical Society, 2016
Series
ECS Transactions, ISSN 1938-5862 ; 75
Keywords
Graphene, Graphene transistors, Humidity sensors, Nanostructured materials, Competing technologies, Device technologies, Electrical and mechanical properties, High-frequency applications, High-frequency electronics, Operating principles, Review papers, Super capacitor, Graphene devices
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-195484 (URN)10.1149/07513.0017ecst (DOI)000406653800003 ()2-s2.0-84991503834 (Scopus ID)9781607685395 (ISBN)
Conference
Symposium on Emerging Nanomaterials and Devices - PRiME 2016/230th ECS Meeting, Honolulu, United States, 2 October 2016 through 7 October 2016
Funder
Swedish Research Council, 2014-6160EU, European Research Council, 641416Stiftelsen Olle Engkvist Byggmästare, 2014/799VINNOVA, 2015-01337
Note

QC 20161125

Available from: 2016-11-25 Created: 2016-11-03 Last updated: 2017-08-25Bibliographically approved
Li, J. & Östling, M. (2015). Conductivity scaling in supercritical percolation of nanoparticles: not a power law. Nanoscale, 7(8), 3424-3428
Open this publication in new window or tab >>Conductivity scaling in supercritical percolation of nanoparticles: not a power law
2015 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 7, no 8, p. 3424-3428Article in journal (Refereed) Published
Abstract [en]

The power-law behavior widely observed in supercritical percolation systems of conductive nanoparticles may merely be a phenomenological approximation to the true scaling law not yet discovered. In this work, we derive a comprehensive yet simple scaling law and verify its extensive applicability to various experimental and numerical systems. In contrast to the power law which lacks theoretical backing, the new scaling law is explanatory and predictive, and thereby helpful to gain more new insights into percolation systems of conductive nanoparticles.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2015
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-161635 (URN)10.1039/c4nr06809b (DOI)000349474200010 ()25631331 (PubMedID)2-s2.0-84923164137 (Scopus ID)
Funder
EU, European Research Council, 641416Swedish Research Council, 2013-5759Swedish Research Council, 2014-6160Göran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology, 1415B
Note

QC 20150324

Available from: 2015-03-24 Created: 2015-03-13 Last updated: 2017-12-04Bibliographically approved
Lobov, G. S., Zhao, Y., Marinins, A., Yan, M., Li, J., Toprak, M. S., . . . Popov, S. (2015). Electric field induced optical anisotropy of P3HT nanofibers in a liquid solution. Optical Materials Express, 5(11), 2642-2647
Open this publication in new window or tab >>Electric field induced optical anisotropy of P3HT nanofibers in a liquid solution
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2015 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 5, no 11, p. 2642-2647Article in journal (Refereed) Published
Abstract [en]

The nanofiber morphology of regioregular Poly-3- hexylthiophene (P3HT) is a 1D crystalline structure organized by π - π stacking of the backbone chains. In this study, we report the impact of electric field on the orientation and optical properties of P3HT nanofibers dispersed in liquid solution. We demonstrate that alternating electric field aligns nanofibers, whereas static electric field forces them to migrate towards the cathode. The alignment of nanofibers introduces anisotropic optical properties, which can be dynamically manipulated until the solvent has evaporated. Time resolved spectroscopic measurements revealed that the electro-optical response time decreases significantly with the magnitude of applied electric field. Thus, for electric field 1.3 V ·μm-1 the response time was measured as low as 20 ms, while for 0.65 V ·μm-1 it was 110-150 ms. Observed phenomenon is the first mention of P3HT supramolecules associated with electrooptical effect. Proposed method provides real time control over the orientation of nanofibers, which is a starting point for a novel practical implementation. With further development P3HT nanofibers can be used individually as an anisotropic solution or as an active component in a guest-host system.

Place, publisher, year, edition, pages
Optical Society of America, 2015
Keywords
Anisotropy, Electric fields, Nanofibers, Real time control, Alternating electric field, Anisotropic optical properties, Crystalline structure, Electric field induced, Electrooptical response, Poly-3-hexylthiophene, Spectroscopic measurements, Static electric fields, Optical properties
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-181212 (URN)10.1364/OME.5.002642 (DOI)000364467700027 ()2-s2.0-84947753945 (Scopus ID)
Note

QC 20160210

Available from: 2016-02-10 Created: 2016-01-29 Last updated: 2017-12-29Bibliographically approved
Lobov, G. S., Zhao, Y., Marinins, A., Yan, M., Li, J., Toprak, M., . . . Popov, S. Y. (2015). Electro-optical response of P3HT nanofibers in liquid solution. In: Asia Communications and Photonics Conference, ACPC 2015: . Paper presented at Asia Communications and Photonics Conference, ACPC 2015, 19 November 2015 through 23 November 2015.
Open this publication in new window or tab >>Electro-optical response of P3HT nanofibers in liquid solution
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2015 (English)In: Asia Communications and Photonics Conference, ACPC 2015, 2015Conference paper, Published paper (Refereed)
Abstract [en]

AC electric poling introduces in P3HT nanofibers anisotropic electro-optical response and birefringence. Along with birefringence, such material exhibits strong amplitude modulation which makes it more efficient alternative to liquid crystals. © 2015 OSA.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-195160 (URN)2-s2.0-84971612086 (Scopus ID)9781943580064 (ISBN)
Conference
Asia Communications and Photonics Conference, ACPC 2015, 19 November 2015 through 23 November 2015
Note

Correspondence Address: Lobov, G.S.; School of Information and Communication Technology, KTH-Royal Institute of TechnologySweden; email: lobov@kth.se. QC 20161108

Available from: 2016-11-08 Created: 2016-11-02 Last updated: 2016-11-08Bibliographically approved
Del, S. K., Bornemann, R., Bablich, A., Schaefer-Eberwein, H., Li, J., Kowald, T., . . . Lemme, M. C. (2015). Optimizing the optical and electrical properties of graphene ink thin films by laser-annealing [Letter to the editor]. 2D Materials, 2(1), Article ID 011003.
Open this publication in new window or tab >>Optimizing the optical and electrical properties of graphene ink thin films by laser-annealing
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2015 (English)In: 2D Materials, ISSN 2053-1583, Vol. 2, no 1, article id 011003Article in journal, Letter (Refereed) Published
Abstract [en]

We demonstrate a facile fabrication technique for graphene-based transparent conductive films. Highly flat and uniform graphene films are obtained through the incorporation of an efficient laser annealing technique with one-time drop casting of high-concentration graphene ink. The resulting thin films are uniform and exhibit a transparency of more than 85% at 550 nm and a sheet resistance of about 30 kΩ/sq. These values constitute an increase of 45% in transparency, a reduction of surface roughness by a factor of four and a decrease of 70% in sheet resistance compared to un-annealed films.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2015
Keywords
graphene, transparent conductor, ink-jet printing, laser annealing
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-196129 (URN)10.1088/2053-1583/2/1/011003 (DOI)000354987200003 ()2-s2.0-84947921205 (Scopus ID)
Funder
EU, European Research Council, 307311EU, European Research Council, 641416German Research Foundation (DFG), LE 2440/1-1German Research Foundation (DFG), HA 3022/7-2Swedish Research Council, 2013-5759Swedish Research Council, 2014–6160Göran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology, 1415 B
Note

QC 20161114

Available from: 2016-11-11 Created: 2016-11-11 Last updated: 2016-11-14Bibliographically approved
Li, J. & Östling, M. (2015). Scalable Fabrication of 2D Semiconducting Crystals for Future Electronics. ELECTRONICS, 4(4), 1033-1061
Open this publication in new window or tab >>Scalable Fabrication of 2D Semiconducting Crystals for Future Electronics
2015 (English)In: ELECTRONICS, ISSN 2079-9292, Vol. 4, no 4, p. 1033-1061Article, review/survey (Refereed) Published
Abstract [en]

Two-dimensional (2D) layered materials are anticipated to be promising for future electronics. However, their electronic applications are severely restricted by the availability of such materials with high quality and at a large scale. In this review, we introduce systematically versatile scalable synthesis techniques in the literature for high-crystallinity large-area 2D semiconducting materials, especially transition metal dichalcogenides, and 2D material-based advanced structures, such as 2D alloys, 2D heterostructures and 2D material devices engineered at the wafer scale. Systematic comparison among different techniques is conducted with respect to device performance. The present status and the perspective for future electronics are discussed.

Place, publisher, year, edition, pages
MDPI, 2015
Keywords
2D materials, transition metal dichalcogenides, field effect transistors, scalable synthesis, vapor phase deposition, 2D semiconducting alloys, 2D heterostructures, selective growth, multi-level stacked devices
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-181388 (URN)10.3390/electronics4041033 (DOI)000367793000019 ()2-s2.0-84958176858 (Scopus ID)
Funder
EU, European Research Council, 641416Swedish Research Council, 2013-5759Swedish Research Council, 2014-6160Swedish Research Council, 2015-00395EU, FP7, Seventh Framework Programme, INCA 600398Göran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology, 1415BStiftelsen Olle Engkvist Byggmästare, 2014/799VINNOVA, 2015-01337
Note

QC 20160201

Available from: 2016-02-01 Created: 2016-02-01 Last updated: 2016-11-22Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6430-6135

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