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  1. AU="Shorubalko, Ivan"
  2. AU="Stewart, Rodney A"
  3. AU="Bakthavatsalu, Maheshwar"
  4. AU="Fussner, Steven"
  5. AU="Dolsten, Mikael"
  6. AU="Sarnyai, Zoltán"
  7. AU=Dongaonkar Ranjeet M
  8. AU="Singh, Leher"
  9. AU="Sevilla Porras, Marta"
  10. AU="Fuller, Chris K"
  11. AU="Vandeloo, Judith"
  12. AU="Meyers, Amanda"
  13. AU="Jiménez-Bambague, Eliana M"
  14. AU="Turner, J C"
  15. AU="Moore, C J" AU="Moore, C J"
  16. AU="Leresche, Téa"
  17. AU=Astrom Siv AU=Astrom Siv
  18. AU="Di Meglio, Florent"
  19. AU=Simon H U
  20. AU=Croucher P I
  21. AU="Jasti, Madhu"

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  1. Artikel ; Online: Fabrication of freestanding photonic devices combining polymer films with microfabrication techniques and 3D printing.

    Hack, Erwin / Shorubalko, Ivan / Graf, Jil / Zolliker, Peter / Mavrona, Elena

    Optics express

    2023  Band 31, Heft 18, Seite(n) 29968–29974

    Abstract: We report a technological concept for freestanding photonic elements based on metamaterials fabricated on polymer films by clean-room processes and framed using 3D printing. A spin-coated cyclic olefin copolymer (TOPAS) of variable thickness down to one ... ...

    Abstract We report a technological concept for freestanding photonic elements based on metamaterials fabricated on polymer films by clean-room processes and framed using 3D printing. A spin-coated cyclic olefin copolymer (TOPAS) of variable thickness down to one micrometer was used as the substrate onto which metamaterials were fabricated using optical lithography. We demonstrate the possibility of applying a second TOPAS layer to protect the device or to allow for stacking another metamaterial layer. To obtain freestanding elements, frames were 3D printed directly on top of the metamaterial before lift-off from the carrier wafer. This ensured maintaining the flatness of the elements. Both the cleanroom process and the 3D printing enabled the design and manufacturing of elements in different sizes and shapes, e.g., to adapt to specific experimental set-ups and holder geometries or to be compatible with standard optical mounts. While TOPAS is transparent for wavelengths from UV to the far infrared, except for a few infrared absorption lines, we illustrate the concept with the simulation and manufacturing of THz band-pass filters. The performance of the fabricated filters was assessed using THz time-domain spectroscopy. The process is scalable to other wavelength ranges and has the potential for upscaling in manufacturing.
    Sprache Englisch
    Erscheinungsdatum 2023-09-14
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.497433
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Ultralarge suspended and perforated graphene membranes for cell culture applications.

    Dorey, Fabien / Furer, Lea A / Zehnder, Sarah / Furrer, Roman / Brönnimann, Rolf / Shorubalko, Ivan / Buerki-Thurnherr, Tina

    Journal of materials chemistry. B

    2023  Band 11, Heft 42, Seite(n) 10097–10107

    Abstract: With its high mechanical strength and its remarkable thermal and electrical properties, suspended graphene has long been expected to find revolutionary applications in optoelectronics or as a membrane in nano-devices. However, the lack of efficient ... ...

    Abstract With its high mechanical strength and its remarkable thermal and electrical properties, suspended graphene has long been expected to find revolutionary applications in optoelectronics or as a membrane in nano-devices. However, the lack of efficient transfer and patterning processes still limits its potential. In this work, we report an optimized anthracene-based transfer process to suspend few layers of graphene (1-, 2- and 4-layers) in the millimeter range (up to 3 mm) with high reproducibility. We have explored the advantages and limitations for patterning of these membranes with micrometer-resolution by focused ion beam (FIB) and picosecond pulsed laser ablation techniques. The FIB approach offers higher patterning resolution but suffers from the low throughput. We demonstrate that cold laser ablation is a fast and flexible method for micro-structuring of suspended graphene. One promising field of application of ultimately thin, microporous graphene membranes is their use as next-generation cell culture supports as alternative to track-etched polymer membranes, which often exhibit poor permeability and limited cell-to-cell communication across the membranes. To this end, we confirmed good adhesion and high viability of placental trophoblast cells cultivated on suspended porous graphene membranes without rupturing of the membranes. Overall, there is high potential for the further development of ultrathin suspended graphene membranes for many future applications, including their use for biobarrier cell culture models to enable predictive transport and toxicity assessment of drugs, environmental pollutants, and nanoparticles.
    Mesh-Begriff(e) Female ; Pregnancy ; Humans ; Graphite ; Membranes, Artificial ; Reproducibility of Results ; Placenta ; Cell Culture Techniques
    Chemische Substanzen Graphite (7782-42-5) ; Membranes, Artificial
    Sprache Englisch
    Erscheinungsdatum 2023-11-01
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2702241-9
    ISSN 2050-7518 ; 2050-750X
    ISSN (online) 2050-7518
    ISSN 2050-750X
    DOI 10.1039/d3tb01784b
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel: Influence of helium ion irradiation on the structure and strength of diamond

    Chen, Ming / Best, James P / Shorubalko, Ivan / Michler, Johann / Spolenak, Ralph / Wheeler, Jeffrey M

    Carbon. 2020 Mar., v. 158

    2020  

    Abstract: Microfabrication of synthetic single crystal diamond using accelerated helium ions beams has significant potential for functional applications, such as high precision optical devices, through tailoring of the optical properties via diamond graphitization. ...

    Abstract Microfabrication of synthetic single crystal diamond using accelerated helium ions beams has significant potential for functional applications, such as high precision optical devices, through tailoring of the optical properties via diamond graphitization. The use of helium ion microscopes (HIM) with nano-scaled focused ion beam spot sizes also allows for precision nano-patterning of the diamond surface through post-exposure selective etching of the generated graphitic phase. Here, single-crystalline diamonds with ⟨100⟩, ⟨110⟩, ⟨111⟩ and ⟨123⟩ orientations are exposed to He ion radiation from a HIM at a range of acceleration voltages and fluences. It is observed that ⟨123⟩ orientation was notably more sensitive to ion irradiation as sp3 bonds transition to sp2 bonds at lower fluence (1015 ions/cm2) compared to other orientations. In situ uniaxial compression of SC diamond micro-pillars revealed the strength of ⟨123⟩-oriented pillars is strongly dependent on the ion fluence, and thus is tunable by ion irradiation. Notably, ⟨100⟩-oriented pillars exhibit a better damage resistance as a small strength degradation due to its higher ion channeling efficiency. The irradiation damage of energetic helium ions on the structure and strength of diamond is therefore highly orientation-dependent. Such results provide the critical knowledge for precise patterning and designing of diamond-based functional structures in nano-fabrication.
    Schlagwörter diamonds ; electric potential difference ; helium ; ions ; irradiation ; microscopes ; optical properties
    Sprache Englisch
    Erscheinungsverlauf 2020-03
    Umfang p. 337-345.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2019.10.078
    Datenquelle NAL Katalog (AGRICOLA)

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  4. Buch ; Online: Scaling of Hybrid QDs-Graphene Photodetectors to Subwavelength Dimension

    Kara, Gökhan / Rohner, Patrik / Wu, Erfu / Dirin, Dmitry N. / Furrer, Roman / Poulikakos, Dimos / Kovalenko, Maksym V. / Calame, Michel / Shorubalko, Ivan

    2023  

    Abstract: Emerging colloidal quantum dot (cQD) photodetectors currently challenge established state-of-the-art infrared photodetectors in response speed, spectral tunability, simplicity of solution processable fabrication, and integration onto curved or flexible ... ...

    Abstract Emerging colloidal quantum dot (cQD) photodetectors currently challenge established state-of-the-art infrared photodetectors in response speed, spectral tunability, simplicity of solution processable fabrication, and integration onto curved or flexible substrates. Hybrid phototransistors based on 2D materials and cQDs, in particular, are promising due to their inherent photogain enabling direct photosignal enhancement. The photogain is sensitive to both, measurement conditions and photodetector geometry. This makes the cross-comparison of devices reported in the literature rather involved. Here, the effect of device length L and width W scaling to subwavelength dimensions (sizes down to 500 nm) on the photoresponse of graphene-PbS cQD phototransistors was experimentally investigated. Photogain and responsivity were found to scale with 1/LW, whereas the photocurrent and specific detectivity were independent of geometrical parameters. The measurements were performed at scaled bias voltage conditions for comparable currents. Contact effects were found to limit the photoresponse for devices with L < 3 {\mu}m. The relation of gate voltage, bias current, light intensity, and frequency on the photoresponse was investigated in detail, and a photogating efficiency to assess the cQD-graphene interface is presented. In particular, the specific detectivity values in the range between 10^8 to 10^9 Jones (wavelength of 1550 nm, frequency 6 Hz, room temperature) were found to be limited by the charge transfer across the photoactive interface.

    Comment: 16 pages and 4 figures
    Schlagwörter Condensed Matter - Materials Science
    Thema/Rubrik (Code) 600
    Erscheinungsdatum 2023-12-08
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  5. Buch ; Online: AFM-IR of EHD-Printed PbS Quantum Dots

    Ferraresi, Lorenzo J. A. / Kara, Gökhan / Burnham, Nancy A. / Furrer, Roman / Dirin, Dmitry N. / La Mattina, Fabio / Kovalenko, Maksym V. / Calame, Michel / Shorubalko, Ivan

    Quantifying Ligand Exchange at the Nanoscale

    2024  

    Abstract: Colloidal quantum dots (cQDs) recently emerged as building blocks for semiconductor materials with tuneable properties. Electro-hydrodynamic printing can be used to obtain sub-micrometre patterns of cQDs without elaborate and aggressive photolithography ... ...

    Abstract Colloidal quantum dots (cQDs) recently emerged as building blocks for semiconductor materials with tuneable properties. Electro-hydrodynamic printing can be used to obtain sub-micrometre patterns of cQDs without elaborate and aggressive photolithography steps. Post-deposition ligand exchange is necessary for the introduction of new functionalities into cQD solids. However, achieving a complete bulk exchange is challenging and conventional infrared spectroscopy lacks the required spatial resolution. Infrared nanospectroscopy (AFM-IR) enables quantitative analysis of the evolution of vibrational signals and structural topography on the nano-metre scale upon ligand substitution on lead sulphide (PbS) cQDs. A solution of ethane-dithiol in acetonitrile demonstrated rapid (~60 s) and controllable exchange of approximately 90% of the ligands, encompassing structures up to ~800 nm in thickness. Prolonged exposures (>1 h) led to the degradation of the microstructures, with a systematic removal of cQDs regulated by surface-to-bulk ratios and solvent interactions. This study establishes a method for the development of devices through a combination of tuneable photoactive materials, additive manufacturing of microstructures, and their quantitative nanometre-scale analysis.

    Comment: 22 pages and 13 figures
    Schlagwörter Physics - Applied Physics ; Condensed Matter - Materials Science ; -
    Erscheinungsdatum 2024-01-09
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  6. Artikel: Colloidal HgTe Quantum Dot/Graphene Phototransistor with a Spectral Sensitivity Beyond 3 µm.

    Grotevent, Matthias J / Hail, Claudio U / Yakunin, Sergii / Bachmann, Dominik / Calame, Michel / Poulikakos, Dimos / Kovalenko, Maksym V / Shorubalko, Ivan

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2021  Band 8, Heft 6, Seite(n) 2003360

    Abstract: Infrared light detection enables diverse technologies ranging from night vision to gas analysis. Emerging technologies such as low-cost cameras for self-driving cars require highly sensitive, low-cost photodetector cameras with spectral sensitivities up ... ...

    Abstract Infrared light detection enables diverse technologies ranging from night vision to gas analysis. Emerging technologies such as low-cost cameras for self-driving cars require highly sensitive, low-cost photodetector cameras with spectral sensitivities up to wavelengths of 10 µm. For this purpose, colloidal quantum dot (QD) graphene phototransistors offer a viable alternative to traditional technologies owing to inexpensive synthesis and processing of QDs. However, the spectral range of QD/graphene phototransistors is thus far limited to 1.6 µm. Here, HgTe QD/graphene phototransistors with spectral sensitivity up to 3 µm are presented, with specific detectivities of 6 × 10
    Sprache Englisch
    Erscheinungsdatum 2021-02-01
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 2808093-2
    ISSN 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202003360
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  7. Artikel ; Online: Hybrid 0D Antimony Halides as Air-Stable Luminophores for High-Spatial-Resolution Remote Thermography.

    Morad, Viktoriia / Yakunin, Sergii / Benin, Bogdan M / Shynkarenko, Yevhen / Grotevent, Matthias J / Shorubalko, Ivan / Boehme, Simon C / Kovalenko, Maksym V

    Advanced materials (Deerfield Beach, Fla.)

    2021  Band 33, Heft 9, Seite(n) e2007355

    Abstract: Luminescent organic-inorganic low-dimensional ... ...

    Abstract Luminescent organic-inorganic low-dimensional ns
    Sprache Englisch
    Erscheinungsdatum 2021-01-22
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202007355
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  8. Artikel ; Online: Helium Scanning Transmission Ion Microscopy and Electrical Characterization of Glass Nanocapillaries with Reproducible Tip Geometries.

    Zweifel, Ludovit P / Shorubalko, Ivan / Lim, Roderick Y H

    ACS nano

    2016  Band 10, Heft 2, Seite(n) 1918–1925

    Abstract: Nanopores fabricated from glass microcapillaries are used in applications ranging from scanning ion conductance microscopy to single-molecule detection. Still, evaluating the nanocapillary tip by a noninvasive means remains challenging. For instance, ... ...

    Abstract Nanopores fabricated from glass microcapillaries are used in applications ranging from scanning ion conductance microscopy to single-molecule detection. Still, evaluating the nanocapillary tip by a noninvasive means remains challenging. For instance, electron microscopy characterization techniques can charge, heat, and contaminate the glass surface and typically require conductive coatings that influence the final tip geometry. Per contra, electrical characterization by the means of ion current through the capillary lumen provides only indirect geometrical details of the tips. Here, we show that helium scanning transmission ion microscopy provides a nondestructive and precise determination of glass nanocapillary tip geometries. This enables the reproducible fabrication of axially asymmetric blunt, bullet, and hourglass-shaped tips with opening diameters from 20 to 400 nm by laser-assisted pulling. Accordingly, this allows for an evaluation of how tip shape, pore diameter, and opening angle impact ionic current rectification behavior and the translocation of single molecules. Our analysis shows that current drops and translocation dwell times are dominated by the pore diameter and opening angles regardless of nanocapillary tip shape.
    Sprache Englisch
    Erscheinungsdatum 2016-02-23
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.5b05754
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  9. Artikel: Ion beam profiling from the interaction with a freestanding 2D layer.

    Shorubalko, Ivan / Choi, Kyoungjun / Stiefel, Michael / Park, Hyung Gyu

    Beilstein journal of nanotechnology

    2017  Band 8, Seite(n) 682–687

    Abstract: Recent years have seen a great potential of the focused ion beam (FIB) technology for the nanometer-scale patterning of a freestanding two-dimensional (2D) layer. Experimentally determined sputtering yields of the perforation process can be ... ...

    Abstract Recent years have seen a great potential of the focused ion beam (FIB) technology for the nanometer-scale patterning of a freestanding two-dimensional (2D) layer. Experimentally determined sputtering yields of the perforation process can be quantitatively explained using the binary collision theory. The main peculiarity of the interaction between the ion beams and the suspended 2D material lies in the absence of collision cascades, featured by no interaction volume. Thus, the patterning resolution is directly set by the beam diameters. Here, we demonstrate pattern resolution beyond the beam size and precise profiling of the focused ion beams. We find out that FIB exposure time of individual pixels can influence the resultant pore diameter. In return, the pore dimension as a function of the exposure dose brings out the ion beam profiles. Using this method of determining an ion-beam point spread function, we verify a Gaussian profile of focused gallium ion beams. Graphene sputtering yield is extracted from the normalization of the measured Gaussian profiles, given a total beam current. Interestingly, profiling of unbeknown helium ion beams in this way results in asymmetry of the profile. Even triangular beam shapes are observed at certain helium FIB conditions, possibly attributable to the trimer nature of the beam source. Our method of profiling ion beams with 2D-layer perforation provides more information on ion beam profiles than the conventional sharp-edge scan method does.
    Sprache Englisch
    Erscheinungsdatum 2017-03-23
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 2583584-1
    ISSN 2190-4286
    ISSN 2190-4286
    DOI 10.3762/bjnano.8.73
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  10. Artikel ; Online: Engineering Optically Active Defects in Hexagonal Boron Nitride Using Focused Ion Beam and Water.

    Glushkov, Evgenii / Macha, Michal / Räth, Esther / Navikas, Vytautas / Ronceray, Nathan / Cheon, Cheol Yeon / Ahmed, Aqeel / Avsar, Ahmet / Watanabe, Kenji / Taniguchi, Takashi / Shorubalko, Ivan / Kis, Andras / Fantner, Georg / Radenovic, Aleksandra

    ACS nano

    2022  Band 16, Heft 3, Seite(n) 3695–3703

    Abstract: Hexagonal boron nitride (hBN) has emerged as a promising material platform for nanophotonics and quantum sensing, hosting optically active defects with exceptional properties such as high brightness and large spectral tuning. However, precise control ... ...

    Abstract Hexagonal boron nitride (hBN) has emerged as a promising material platform for nanophotonics and quantum sensing, hosting optically active defects with exceptional properties such as high brightness and large spectral tuning. However, precise control over deterministic spatial positioning of emitters in hBN remained elusive for a long time, limiting their proper correlative characterization and applications in hybrid devices. Recently, focused ion beam (FIB) systems proved to be useful to engineer several types of spatially defined emitters with various structural and photophysical properties. Here we systematically explore the physical processes leading to the creation of optically active defects in hBN using FIB and find that beam-substrate interaction plays a key role in the formation of defects. These findings are confirmed using transmission electron microscopy, which reveals local mechanical deterioration of the hBN layers and local amorphization of ion beam irradiated hBN. Additionally, we show that, upon exposure to water, amorphized hBN undergoes a structural and optical transition between two defect types with distinctive emission properties. Moreover, using super-resolution optical microscopy combined with atomic force microscopy, we pinpoint the exact location of emitters within the defect sites, confirming the role of defected edges as primary sources of fluorescent emission. This lays the foundation for FIB-assisted engineering of optically active defects in hBN with high spatial and spectral control for applications ranging from integrated photonics, to nanoscale sensing, and to nanofluidics.
    Sprache Englisch
    Erscheinungsdatum 2022-03-07
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.1c07086
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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