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Ursaki V, Braniste T, Zalamai V, Rusu E, Ciobanu V, Morari V, Podgornii D, Ricci PC, Adelung R, Tiginyanu I. Aero-ZnS prepared by physical vapor transport on three-dimensional networks of sacrificial ZnO microtetrapods. Beilstein J Nanotechnol 2024; 15:490-499. [PMID: 38711580 PMCID: PMC11070954 DOI: 10.3762/bjnano.15.44] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Accepted: 04/15/2024] [Indexed: 05/08/2024]
Abstract
Aeromaterials represent a class of increasingly attractive materials for various applications. Among them, aero-ZnS has been produced by hydride vapor phase epitaxy on sacrificial ZnO templates consisting of networks of microtetrapods and has been proposed for microfluidic applications. In this paper, a cost-effective technological approach is proposed for the fabrication of aero-ZnS by using physical vapor transport with Sn2S3 crystals and networks of ZnO microtetrapods as precursors. The morphology of the produced material is investigated by scanning electron microscopy (SEM), while its crystalline and optical qualities are assessed by X-ray diffraction (XRD) analysis and photoluminescence (PL) spectroscopy, respectively. We demonstrate possibilities for controlling the composition and the crystallographic phase content of the prepared aerogels by the duration of the technological procedure. A scheme of deep energy levels and electronic transitions in the ZnS skeleton of the aeromaterial was deduced from the PL analysis, suggesting that the produced aerogel is a potential candidate for photocatalytic and sensor applications.
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Affiliation(s)
- Veaceslav Ursaki
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
- Academy of Sciences of Moldova, Chisinau, Republic of Moldova
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Victor Zalamai
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Emil Rusu
- Institute of Electronic Engineering and Nanotechnology „D. Ghitu”, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Vladimir Ciobanu
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Vadim Morari
- Institute of Electronic Engineering and Nanotechnology „D. Ghitu”, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Daniel Podgornii
- Institute of Applied Physics, State University of Moldova, Chisinau, Republic of Moldova
| | | | - Rainer Adelung
- Department of Material Science, Kiel University, Kiel, Germany
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
- Academy of Sciences of Moldova, Chisinau, Republic of Moldova
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2
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Wolff N, Braniste T, Krüger H, Mangelsen S, Islam MR, Schürmann U, Saure LM, Schütt F, Hansen S, Terraschke H, Adelung R, Tiginyanu I, Kienle L. Synthesis and Nanostructure Investigation of Hybrid β-Ga 2 O 3 /ZnGa 2 O 4 Nanocomposite Networks with Narrow-Band Green Luminescence and High Initial Electrochemical Capacity. Small 2023; 19:e2207492. [PMID: 36782364 DOI: 10.1002/smll.202207492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 01/20/2023] [Indexed: 05/04/2023]
Abstract
The material design of functional "aero"-networks offers a facile approach to optical, catalytical, or and electrochemical applications based on multiscale morphologies, high large reactive area, and prominent material diversity. Here in this paper, the synthesis and structural characterization of a hybrid β-Ga2 O3 /ZnGa2 O4 nanocomposite aero-network are presented. The nanocomposite networks are studied on multiscale with respect to their micro- and nanostructure by X-ray diffraction (XRD) and transmission electron microscopy (TEM) and are characterized for their photoluminescent response to UV light excitation and their electrochemical performance with Li-ion conversion reaction. The structural investigations reveal the simultaneous transformation of the precursor aero-GaN(ZnO) network into hollow architectures composed of β-Ga2 O3 and ZnGa2 O4 nanocrystals with a phase ratio of ≈1:2. The photoluminescence of hybrid aero-β-Ga2 O3 /ZnGa2 O4 nanocomposite networks demonstrates narrow band (λem = 504 nm) green light emission of ZnGa2 O4 under UV light excitation (λex = 300 nm). The evaluation of the metal-oxide network performance for electrochemical application for Li-ion batteries shows high initial capacities of ≈714 mAh g-1 at 100 mA g-1 paired with exceptional rate performance even at high current densities of 4 A g-1 with 347 mAh g-1 . This study provides is an exciting showcase example of novel networked materials and demonstrates the opportunities of tailored micro-/nanostructures for diverse applications a diversity of possible applications.
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Affiliation(s)
- Niklas Wolff
- Synthesis and Real Structure, Department of Material Science, Kiel University, Kaiserstraße 2, D-24143, Kiel, Germany
- Kiel Nano, Surface and Interface Science (KiNSIS), Kiel University, Christian-Albrechts-Platz 4, D-24118, Kiel, Germany
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare 168, Chisinau, MD-2004, Moldova
| | - Helge Krüger
- Functional Nanomaterials, Department of Material Science, Kiel University, Kaiserstraße 2, D-24143, Kiel, Germany
| | - Sebastian Mangelsen
- Kiel Nano, Surface and Interface Science (KiNSIS), Kiel University, Christian-Albrechts-Platz 4, D-24118, Kiel, Germany
- Solid State Chemistry and Catalysis, Department of Inorganic Chemistry, Kiel University, Max-Eyth-Straße 2, D-24118, Kiel, Germany
| | - Md Redwanul Islam
- Synthesis and Real Structure, Department of Material Science, Kiel University, Kaiserstraße 2, D-24143, Kiel, Germany
| | - Ulrich Schürmann
- Synthesis and Real Structure, Department of Material Science, Kiel University, Kaiserstraße 2, D-24143, Kiel, Germany
- Kiel Nano, Surface and Interface Science (KiNSIS), Kiel University, Christian-Albrechts-Platz 4, D-24118, Kiel, Germany
| | - Lena M Saure
- Functional Nanomaterials, Department of Material Science, Kiel University, Kaiserstraße 2, D-24143, Kiel, Germany
| | - Fabian Schütt
- Kiel Nano, Surface and Interface Science (KiNSIS), Kiel University, Christian-Albrechts-Platz 4, D-24118, Kiel, Germany
- Functional Nanomaterials, Department of Material Science, Kiel University, Kaiserstraße 2, D-24143, Kiel, Germany
| | - Sandra Hansen
- Kiel Nano, Surface and Interface Science (KiNSIS), Kiel University, Christian-Albrechts-Platz 4, D-24118, Kiel, Germany
- Functional Nanomaterials, Department of Material Science, Kiel University, Kaiserstraße 2, D-24143, Kiel, Germany
| | - Huayna Terraschke
- Kiel Nano, Surface and Interface Science (KiNSIS), Kiel University, Christian-Albrechts-Platz 4, D-24118, Kiel, Germany
- Solid State Chemistry and Catalysis, Department of Inorganic Chemistry, Kiel University, Max-Eyth-Straße 2, D-24118, Kiel, Germany
| | - Rainer Adelung
- Kiel Nano, Surface and Interface Science (KiNSIS), Kiel University, Christian-Albrechts-Platz 4, D-24118, Kiel, Germany
- Functional Nanomaterials, Department of Material Science, Kiel University, Kaiserstraße 2, D-24143, Kiel, Germany
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare 168, Chisinau, MD-2004, Moldova
- Academy of Sciences of Moldova, Stefan cel Mare av. 1, Chisinau, MD-2001, Moldova
| | - Lorenz Kienle
- Synthesis and Real Structure, Department of Material Science, Kiel University, Kaiserstraße 2, D-24143, Kiel, Germany
- Kiel Nano, Surface and Interface Science (KiNSIS), Kiel University, Christian-Albrechts-Platz 4, D-24118, Kiel, Germany
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Dragoman M, Dragoman D, Dinescu A, Avram A, Vulpe S, Aldrigo M, Braniste T, Suman V, Rusu E, Tiginyanu I. Ultralow voltage (1 μV) electrical switching of SnS thin films driven by a vertical electric field. Nanotechnology 2023; 34:175203. [PMID: 36706454 DOI: 10.1088/1361-6528/acb69e] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 01/27/2023] [Indexed: 06/18/2023]
Abstract
In this paper, we show in a series of experiments on 10 nm thick SnS thin film-based back-gate transistors that in the absence of the gate voltage, the drain current versus drain voltage (ID-VD) dependence is characterized by a weak drain current and by an ambipolar transport mechanism. When we apply a gate voltage as low as 1μV, the current increases by several orders of magnitude and theID-VDdependence changes drastically, with the SnS behaving as ap-type semiconductor. This happens because the current flows from the source (S) to the drain (D) electrode through a discontinuous superficial region of the SnS film when no gate voltage is applied. On the contrary, when minute gate voltages are applied, the vertical electric field applied to the multilayer SnS induces a change in the flow path of the charge carriers, involving the inner and continuous SnS layer in the electrical conduction. Moreover, we show that high gate voltages can tune significantly the SnS bandgap.
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Affiliation(s)
- Mircea Dragoman
- National Institute for Research and Development in Microtechnologies, Erou Iancu Nicolae Street 126A, 077190 Voluntari (Ilfov), Romania
| | - Daniela Dragoman
- Univ. of Bucharest, Physics Faculty, PO Box MG-11, 077125 Bucharest, Romania
- Academy of Romanian Scientists, Str. Ilfov 3, 050044 Bucharest, Romania
| | - Adrian Dinescu
- National Institute for Research and Development in Microtechnologies, Erou Iancu Nicolae Street 126A, 077190 Voluntari (Ilfov), Romania
| | - Andrei Avram
- National Institute for Research and Development in Microtechnologies, Erou Iancu Nicolae Street 126A, 077190 Voluntari (Ilfov), Romania
| | - Silviu Vulpe
- National Institute for Research and Development in Microtechnologies, Erou Iancu Nicolae Street 126A, 077190 Voluntari (Ilfov), Romania
| | - Martino Aldrigo
- National Institute for Research and Development in Microtechnologies, Erou Iancu Nicolae Street 126A, 077190 Voluntari (Ilfov), Romania
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare Av., 2004 Chisinau, Moldova
| | - Victor Suman
- Institute of Electronic Engineering and Nanotechnologies, Academiei Street 3/3, 2028 Chisinau, Moldova
| | - Emil Rusu
- Institute of Electronic Engineering and Nanotechnologies, Academiei Street 3/3, 2028 Chisinau, Moldova
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare Av., 2004 Chisinau, Moldova
- Academy of Sciences of Moldova, 1 Stefan cel Mare Av., 2004 Chisinau, Moldova
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4
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Dragoman M, Dinescu A, Avram A, Dragoman D, Vulpe S, Aldrigo M, Braniste T, Suman V, Rusu E, Tiginyanu I. Ultrathin tin sulfide field-effect transistors with subthreshold slope below 60 mV/decade. Nanotechnology 2022; 33:405207. [PMID: 35767973 DOI: 10.1088/1361-6528/ac7cf8] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
In this paper, we present for the first time a field-effect-transistor (FET) having a 10 nm thick tin sulfide (SnS) channel fabricated at the wafer scale with high reproducibility. SnS-based FETs are in on-state for increasing positive back-gate voltages up to 6 V, whereas the off-state is attained for negative back-gate voltages not exceeding -6 V, the on/off ratio being in the range 102-103depending on FET dimensions. The SnS FETs show a subthreshold slope (SS) below 60 mV/decade thanks to the in-plane ferroelectricity of SnS and attaining a minimum value SS = 21 mV/decade. Moreover, the low SS values can be explained by the existence of a negative value of the capacitance of the SnS thin film up to 10 GHz (for any DC bias voltage between 1 and 5 V), with the minimum value being -12.87 pF at 0.1 GHz.
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Affiliation(s)
- Mircea Dragoman
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Adrian Dinescu
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Andrei Avram
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Daniela Dragoman
- Univ. of Bucharest, Physics Faculty, PO Box MG-11, 077125 Bucharest, Romania
- Academy of Romanian Scientists, Str. Ilfov 3, 050044 Bucharest, Romania
| | - Silviu Vulpe
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Martino Aldrigo
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare Av., 2004 Chisinau, Moldova
| | - Victor Suman
- Institute of Electronic Engineering and Nanotechnologies, Academiei Street 3/3, 2028 Chisinau, Moldova
| | - Emil Rusu
- Institute of Electronic Engineering and Nanotechnologies, Academiei Street 3/3, 2028 Chisinau, Moldova
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare Av., 2004 Chisinau, Moldova
- Academy of Sciences of Moldova, 1 Stefan cel Mare Av., 2004 Chisinau, Moldova
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Dragoman M, Aldrigo M, Dinescu A, Iordanescu S, Romanitan C, Vulpe S, Dragoman D, Braniste T, Suman V, Rusu E, Tiginyanu I. The microwave properties of tin sulfide thin films prepared by RF magnetron sputtering techniques. Nanotechnology 2022; 33:235705. [PMID: 35235921 DOI: 10.1088/1361-6528/ac59e3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 03/02/2022] [Indexed: 06/14/2023]
Abstract
In this paper we present the microwave properties of tin sulfide (SnS) thin films with the thickness of just 10 nm, grown by RF magnetron sputtering techniques on a 4 inch silicon dioxide/high-resistivity silicon wafer. In this respect, interdigitated capacitors in coplanar waveguide technology were fabricated directly on the SnS film to be used as both phase shifters and detectors, depending on the ferroelectric or semiconductor behaviour of the SnS material. The ferroelectricity of the semiconducting thin layer manifests itself in a strong dependence of the electrical permittivity on the applied DC bias voltage, which induces a phase shift of 30 degrees mm-1at 1 GHz and of 8 degrees mm-1at 10 GHz, whereas the transmission losses are less than 2 dB in the frequency range 2-20 GHz. We have also investigated the microwave detection properties of SnS, obtaining at 1 GHz a voltage responsivity of about 30 mV mW-1in the unbiased case and with an input power level of only 16μW.
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Affiliation(s)
- Mircea Dragoman
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Martino Aldrigo
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Adrian Dinescu
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Sergiu Iordanescu
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Cosmin Romanitan
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Silviu Vulpe
- National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190 Voluntari (Ilfov), Romania
| | - Daniela Dragoman
- Univ. of Bucharest, Physics Faculty, PO Box MG-11, 077125 Bucharest, Romania
- Academy of Romanian Scientists, Str. Ilfov 3, 050044 Bucharest, Romania
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare Av., 2004 Chisinau, Moldova
| | - Victor Suman
- Institute of Electronic Engineering and Nanotechnologies, Academiei Street 3/3, 2028 Chisinau, Moldova
| | - Emil Rusu
- Institute of Electronic Engineering and Nanotechnologies, Academiei Street 3/3, 2028 Chisinau, Moldova
| | - Ion Tiginyanu
- Academy of Sciences of Moldova, 1 Stefan cel Mare Av., 2004 Chisinau, Moldova
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Ciobanu V, Roncari F, Ceccone G, Braniste T, Ponti J, Bogni A, Guerrini G, Cassano D, Colpo P, Tiginyanu I. Protein-corona formation on aluminum doped zinc oxide and gallium nitride nanoparticles. J Appl Biomater Funct Mater 2022; 20:22808000221131881. [DOI: 10.1177/22808000221131881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The interaction of semiconductor nanoparticles with bio-molecules attracts increasing interest of researchers, considering the reactivity of nanoparticles and the possibility to control their properties remotely giving mechanical, thermal, or electrical stimulus to the surrounding bio-environment. This work reports on a systematic comparative study of the protein-corona formation on aluminum doped zinc oxide and gallium nitride nanoparticles. Bovine serum albumin was chosen as a protein model. Dynamic light scattering, transmission electron microscopy and X-ray photoelectron spectroscopy techniques have been used to demonstrate the formation of protein-corona as well as the stability of the colloidal suspension given by BSA, which also works as a surfactant. The protein adsorption on the NPs surface studied by Bradford Assay showed the dependence on the quantity of proteins adsorbed to the available sites on the NPs surface, thus the saturation was observed at ratio higher than 5:1 (NPs:Proteins) in case of ZnO, these correlating with DLS results. Moreover, the kinetics of the proteins showed a relatively fast adsorption on the NPs surface with a saturation curve after about 25 min. GaN NPs, however, showed a very small amount of proteins adsorbed on the surface, a change in the hydrodynamic size being not observable with DLS technique or differential centrifugal sedimentation. The Circular Dichroism analysis suggests a drastic structural change in the secondary structure of the BSA after attaching on the NPs surface. The ZnO nanoparticles adsorb a protein-corona, which does not protect them against dissolution, and in consequence, the material proved to be highly toxic for Human keratinocyte cell line (HaCaT) at concentration above 25 µg/mL. In contrast, the GaN nanoparticles which do not adsorb a protein-corona, show no toxicity signs for HaCaT cells at concentration as high as 50 µg/mL, exhibiting much lower concentration of ions leakage in the culture medium as compared to ZnO nanoparticles.
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Affiliation(s)
- Vladimir Ciobanu
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Moldova
| | | | - Giacomo Ceccone
- European Commission, Joint Research Center (JRC), Ispra, Italy
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Moldova
| | - Jessica Ponti
- European Commission, Joint Research Center (JRC), Ispra, Italy
| | - Alessia Bogni
- European Commission, Joint Research Center (JRC), Ispra, Italy
| | | | | | - Pascal Colpo
- European Commission, Joint Research Center (JRC), Ispra, Italy
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Moldova
- Academy of Sciences of Moldova, Chisinau, Moldova
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Petris A, Gheorghe P, Braniste T, Tiginyanu I. Ultrafast Third-Order Nonlinear Optical Response Excited by fs Laser Pulses at 1550 nm in GaN Crystals. Materials (Basel) 2021; 14:ma14123194. [PMID: 34200536 PMCID: PMC8229523 DOI: 10.3390/ma14123194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 06/04/2021] [Accepted: 06/05/2021] [Indexed: 11/16/2022]
Abstract
The ultrafast third-order optical nonlinearity of c-plane GaN crystal, excited by ultrashort (fs) high-repetition-rate laser pulses at 1550 nm, wavelength important for optical communications, is investigated for the first time by optical third-harmonic generation in non-phase-matching conditions. As the thermo-optic effect that can arise in the sample by cumulative thermal effects induced by high-repetition-rate laser pulses cannot be responsible for the third-harmonic generation, the ultrafast nonlinear optical effect of solely electronic origin is the only one involved in this process. The third-order nonlinear optical susceptibility of GaN crystal responsible for the third-harmonic generation process, an important indicative parameter for the potential use of this material in ultrafast photonic functionalities, is determined.
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Affiliation(s)
- Adrian Petris
- National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Magurele, Romania
- Correspondence: (A.P.); (P.G.)
| | - Petronela Gheorghe
- National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Magurele, Romania
- Correspondence: (A.P.); (P.G.)
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, 2004 Chisinau, Moldova; (T.B.); (I.T.)
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, 2004 Chisinau, Moldova; (T.B.); (I.T.)
- Academy of Sciences of Moldova, Stefan cel Mare av. 1, 2001 Chisinau, Moldova
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Plesco I, Ciobanu V, Braniste T, Ursaki V, Rasch F, Sarua A, Raevschi S, Adelung R, Dutta J, Tiginyanu I. Highly Porous and Ultra-Lightweight Aero-Ga 2O 3: Enhancement of Photocatalytic Activity by Noble Metals. Materials (Basel) 2021; 14:1985. [PMID: 33921020 PMCID: PMC8071440 DOI: 10.3390/ma14081985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 04/07/2021] [Accepted: 04/12/2021] [Indexed: 01/09/2023]
Abstract
A new type of photocatalyst is proposed on the basis of aero-β-Ga2O3, which is a material constructed from a network of interconnected tetrapods with arms in the form of microtubes with nanometric walls. The aero-Ga2O3 material is obtained by annealing of aero-GaN fabricated by epitaxial growth on ZnO microtetrapods. The hybrid structures composed of aero-Ga2O3 functionalized with Au or Pt nanodots were tested for the photocatalytic degradation of methylene blue dye under UV or visible light illumination. The functionalization of aero-Ga2O3 with noble metals results in the enhancement of the photocatalytic performances of bare material, reaching the performances inherent to ZnO while gaining the advantage of the increased chemical stability. The mechanisms of enhancement of the photocatalytic properties by activating aero-Ga2O3 with noble metals are discussed to elucidate their potential for environmental applications.
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Affiliation(s)
- Irina Plesco
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare Av. 168, MD-2004 Chisinau, Moldova; (V.C.); (T.B.); (V.U.)
| | - Vladimir Ciobanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare Av. 168, MD-2004 Chisinau, Moldova; (V.C.); (T.B.); (V.U.)
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare Av. 168, MD-2004 Chisinau, Moldova; (V.C.); (T.B.); (V.U.)
| | - Veaceslav Ursaki
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare Av. 168, MD-2004 Chisinau, Moldova; (V.C.); (T.B.); (V.U.)
| | - Florian Rasch
- Functional Nanomaterials, Institute for Materials Science, Kiel University, Kaiser Str. 2, 24143 Kiel, Germany; (F.R.); (R.A.)
| | - Andrei Sarua
- H. H. Wills Physics Laboratory, School of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK;
| | - Simion Raevschi
- Department of Physics and Engineering, State University of Moldova, Alexei Mateevici Str. 60, MD-2009 Chisinau, Moldova;
| | - Rainer Adelung
- Functional Nanomaterials, Institute for Materials Science, Kiel University, Kaiser Str. 2, 24143 Kiel, Germany; (F.R.); (R.A.)
| | - Joydeep Dutta
- Functional Materials Group, Applied Physics Department, School of Engineering Sciences, KTH Royal Institute of Technology, Hannes Alfvéns väg 12, 11419 Stockholm, Sweden;
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare Av. 168, MD-2004 Chisinau, Moldova; (V.C.); (T.B.); (V.U.)
- Academy of Sciences of Moldova, Stefan cel Mare Av. 1, MD-2001 Chisinau, Moldova
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Braniste T, Dragoman M, Zhukov S, Aldrigo M, Ciobanu V, Iordanescu S, Alyabyeva L, Fumagalli F, Ceccone G, Raevschi S, Schütt F, Adelung R, Colpo P, Gorshunov B, Tiginyanu I. Aero-Ga 2O 3 Nanomaterial Electromagnetically Transparent from Microwaves to Terahertz for Internet of Things Applications. Nanomaterials (Basel) 2020; 10:nano10061047. [PMID: 32485927 PMCID: PMC7352668 DOI: 10.3390/nano10061047] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 05/24/2020] [Accepted: 05/27/2020] [Indexed: 11/16/2022]
Abstract
In this paper, fabrication of a new material is reported, the so-called Aero-Ga2O3 or Aerogallox, which represents an ultra-porous and ultra-lightweight three-dimensional architecture made from interconnected microtubes of gallium oxide with nanometer thin walls. The material is fabricated using epitaxial growth of an ultrathin layer of gallium nitride on zinc oxide microtetrapods followed by decomposition of sacrificial ZnO and oxidation of GaN which according to the results of X-ray diffraction (XRD) and X-ray photoemission spectroscopy (XPS) characterizations, is transformed gradually in β-Ga2O3 with almost stoichiometric composition. The investigations show that the developed ultra-porous Aerogallox exhibits extremely low reflectivity and high transmissivity in an ultrabroadband electromagnetic spectrum ranging from X-band (8-12 GHz) to several terahertz which opens possibilities for quite new applications of gallium oxide, previously not anticipated.
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Affiliation(s)
- Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, 2004 Chisinau, Moldova;
- Correspondence: (T.B.); (I.T.); Tel.: +373-22-509-920 (I.T.)
| | - Mircea Dragoman
- National Institute for Research and Development in Microtechnologies (IMT Bucharest), Erou Iancu Nicolae Street 126A, 077190 Voluntari, Romania; (M.D.); (M.A.); (S.I.)
| | - Sergey Zhukov
- Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (State University), 9 Institutskiy per., 141701 Dolgoprudny, Russia; (S.Z.); (L.A.); (B.G.)
| | - Martino Aldrigo
- National Institute for Research and Development in Microtechnologies (IMT Bucharest), Erou Iancu Nicolae Street 126A, 077190 Voluntari, Romania; (M.D.); (M.A.); (S.I.)
| | - Vladimir Ciobanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, 2004 Chisinau, Moldova;
| | - Sergiu Iordanescu
- National Institute for Research and Development in Microtechnologies (IMT Bucharest), Erou Iancu Nicolae Street 126A, 077190 Voluntari, Romania; (M.D.); (M.A.); (S.I.)
| | - Liudmila Alyabyeva
- Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (State University), 9 Institutskiy per., 141701 Dolgoprudny, Russia; (S.Z.); (L.A.); (B.G.)
| | - Francesco Fumagalli
- European Commission, Joint Research Centre (JRC), Via E. Fermi, 2749, 21027 Ispra, Italy; (F.F.); (G.C.); (P.C.)
| | - Giacomo Ceccone
- European Commission, Joint Research Centre (JRC), Via E. Fermi, 2749, 21027 Ispra, Italy; (F.F.); (G.C.); (P.C.)
| | - Simion Raevschi
- Department of Physics and Engineering, State University of Moldova, Alexei Mateevici str. 60, 2009 Chisinau, Moldova;
| | - Fabian Schütt
- Institute for Materials Science, Kiel University, Kaiserstr. 2, D-24143 Kiel, Germany; (F.S.); (R.A.)
| | - Rainer Adelung
- Institute for Materials Science, Kiel University, Kaiserstr. 2, D-24143 Kiel, Germany; (F.S.); (R.A.)
| | - Pascal Colpo
- European Commission, Joint Research Centre (JRC), Via E. Fermi, 2749, 21027 Ispra, Italy; (F.F.); (G.C.); (P.C.)
| | - Boris Gorshunov
- Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology (State University), 9 Institutskiy per., 141701 Dolgoprudny, Russia; (S.Z.); (L.A.); (B.G.)
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, 2004 Chisinau, Moldova;
- Academy of Sciences of Moldova, Stefan cel Mare av. 1, MD-2001 Chisinau, Moldova
- Correspondence: (T.B.); (I.T.); Tel.: +373-22-509-920 (I.T.)
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10
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Braniste T, Cobzac V, Ababii P, Plesco I, Raevschi S, Didencu A, Maniuc M, Nacu V, Ababii I, Tiginyanu I. Mesenchymal stem cells proliferation and remote manipulation upon exposure to magnetic semiconductor nanoparticles. ACTA ACUST UNITED AC 2020; 25:e00435. [PMID: 32090026 PMCID: PMC7025179 DOI: 10.1016/j.btre.2020.e00435] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 11/28/2019] [Accepted: 02/10/2020] [Indexed: 12/11/2022]
Abstract
In this paper, we report on spatial redistribution of bone marrow mesenchymal stem cells loaded with magnetic nanoparticles under the influence of continuously applied magnetic field. Semiconductor nanoparticles were synthesized by epitaxial growth of a GaN thin layer on magnetic sacrificial core consisting of ZnFe2O4 nanoparticles. Different quantities of nanoparticles were incubated in vitro with mesenchymal stem cells. High density of nanoparticles (50 μg/ml) leads to a decrease in the number of cells during incubation, while the density of nanoparticles as low as 10 μg/ml is enough to drag cells in culture and rearrange them according to the spatial distribution of the magnetic field intensity.
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Affiliation(s)
- Tudor Braniste
- National Center for Materials Study and Testing. Technical University of Moldova, Stefan cel Mare av. 168, Chisinau, 2004, Republic of Moldova
- Corresponding authors at: National Center for Materials Study and Testing. Technical University of Moldova, Stefan cel Mare av. 168, Chisinau, 2004, Republic of Moldova.
| | - Vitalie Cobzac
- Laboratory of Tissue Engineering and Cells Cultures. State University of Medicine and Pharmacy “Nicolae Testemiteanu”, Stefan cel Mare av. 165, Chisinau, 2004, Republic of Moldova
| | - Polina Ababii
- Department of Otorhinolaryngology. State University of Medicine and Pharmacy “Nicolae Testemiteanu”, Stefan cel Mare av. 165, Chisinau, 2004, Republic of Moldova
| | - Irina Plesco
- National Center for Materials Study and Testing. Technical University of Moldova, Stefan cel Mare av. 168, Chisinau, 2004, Republic of Moldova
| | - Simion Raevschi
- Department of Physics and Engineering, State University of Moldova, Alexei Mateevici str. 60, Chisinau, 2009, Republic of Moldova
| | - Alexandru Didencu
- Department of Otorhinolaryngology. State University of Medicine and Pharmacy “Nicolae Testemiteanu”, Stefan cel Mare av. 165, Chisinau, 2004, Republic of Moldova
| | - Mihail Maniuc
- Department of Otorhinolaryngology. State University of Medicine and Pharmacy “Nicolae Testemiteanu”, Stefan cel Mare av. 165, Chisinau, 2004, Republic of Moldova
| | - Viorel Nacu
- Laboratory of Tissue Engineering and Cells Cultures. State University of Medicine and Pharmacy “Nicolae Testemiteanu”, Stefan cel Mare av. 165, Chisinau, 2004, Republic of Moldova
| | - Ion Ababii
- Department of Otorhinolaryngology. State University of Medicine and Pharmacy “Nicolae Testemiteanu”, Stefan cel Mare av. 165, Chisinau, 2004, Republic of Moldova
| | - Ion Tiginyanu
- National Center for Materials Study and Testing. Technical University of Moldova, Stefan cel Mare av. 168, Chisinau, 2004, Republic of Moldova
- Academy of Sciences of Moldova, Stefan cel Mare av. 1, Chisinau, 2001, Republic of Moldova
- Corresponding authors at: National Center for Materials Study and Testing. Technical University of Moldova, Stefan cel Mare av. 168, Chisinau, 2004, Republic of Moldova.
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11
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Wolff N, Ciobanu V, Enachi M, Kamp M, Braniste T, Duppel V, Shree S, Raevschi S, Medina-Sánchez M, Adelung R, Schmidt OG, Kienle L, Tiginyanu I. Advanced Hybrid GaN/ZnO Nanoarchitectured Microtubes for Fluorescent Micromotors Driven by UV Light. Small 2020; 16:e1905141. [PMID: 31814275 DOI: 10.1002/smll.201905141] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 11/13/2019] [Indexed: 06/10/2023]
Abstract
The development of functional microstructures with designed hierarchical and complex morphologies and large free active surfaces offers new potential for improvement of the pristine microstructures properties by the synergistic combination of microscopic as well as nanoscopic effects. In this contribution, dedicated methods of transmission electron microscopy (TEM) including tomography are used to characterize the complex hierarchically structured hybrid GaN/ZnO:Au microtubes containing a dense nanowire network on their interior. The presence of an epitaxially stabilized and chemically extremely stable ultrathin layer of ZnO on the inner wall of the produced GaN microtubes is evidenced. Gold nanoparticles initially trigger the catalytic growth of solid solution phase (Ga1- x Znx )(N1- x Ox ) nanowires into the interior space of the microtube, which are found to be terminated by AuGa-alloy nanodots coated in a shell of amorphous GaOx species after the hydride vapor phase epitaxy process. The structural characterization suggests that this hierarchical design of GaN/ZnO microtubes could offer the potential to exhibit improved photocatalytic properties, which are initially demonstrated under UV light irradiation. As a proof of concept, the produced microtubes are used as photocatalytic micromotors in the presence of hydrogen peroxide solution with luminescent properties, which are appealing for future environmental applications and active matter fundamental studies.
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Affiliation(s)
- Niklas Wolff
- Synthesis and Real Structure, Institute for Materials Science, Kiel University, Kaiserstraße 2, 24143, Kiel, Germany
| | - Vladimir Ciobanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare 168, Chisinau, 2004, Moldova
| | - Mihail Enachi
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare 168, Chisinau, 2004, Moldova
| | - Marius Kamp
- Synthesis and Real Structure, Institute for Materials Science, Kiel University, Kaiserstraße 2, 24143, Kiel, Germany
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare 168, Chisinau, 2004, Moldova
| | - Viola Duppel
- Nanochemistry, Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569, Stuttgart, Germany
| | - Sindu Shree
- Functional Nanomaterials, Institute for Materials Science, Kiel University, Kaiserstraße 2, 24143, Kiel, Germany
| | - Simion Raevschi
- Department of Physics and Engineering, State University of Moldova, Alexei Mateevici Str. 60, Chisinau, 2009, Moldova
| | - Mariana Medina-Sánchez
- Institute for Integrative Nanosciences (IIN), Leibniz IFW Dresden, Helmholtzstraße 20, 01069, Dresden, Germany
| | - Rainer Adelung
- Functional Nanomaterials, Institute for Materials Science, Kiel University, Kaiserstraße 2, 24143, Kiel, Germany
| | - Oliver G Schmidt
- Institute for Integrative Nanosciences (IIN), Leibniz IFW Dresden, Helmholtzstraße 20, 01069, Dresden, Germany
- Material Systems for Nanoelectronics, Chemnitz University of Technology, Reichenhainer Straße 70, 09107, Chemnitz, Germany
| | - Lorenz Kienle
- Synthesis and Real Structure, Institute for Materials Science, Kiel University, Kaiserstraße 2, 24143, Kiel, Germany
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare 168, Chisinau, 2004, Moldova
- Academy of Sciences of Moldova, Stefan cel Mare av. 1, Chisinau, 2001, Moldova
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12
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Dragoman M, Braniste T, Iordanescu S, Aldrigo M, Raevschi S, Shree S, Adelung R, Tiginyanu I. Electromagnetic interference shielding in X-band with aero-GaN. Nanotechnology 2019; 30:34LT01. [PMID: 31067518 DOI: 10.1088/1361-6528/ab2023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We investigate the electromagnetic shielding properties of an ultra-porous lightweight nanomaterial named aerogalnite (aero-GaN). Aero-GaN is made up of randomly arranged hollow GaN microtetrapods, which are obtained by direct growth using hydride vapor phase epitaxy of GaN on the sacrificial network of ZnO microtetrapods. A 2 mm thick aero-GaN sample exhibits electromagnetic shielding properties in the X-band similar to solid structures based on metal foams or carbon nanomaterials. Aero-GaN has a weight four to five orders of magnitude lower than the weight of metals.
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Affiliation(s)
- Mircea Dragoman
- National Research and Development Institute in Microtechnology, Str. Erou Iancu Nicolae 126A, Bucharest 077190, Romania
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13
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Strobel J, Ghimpu L, Postica V, Lupan O, Zapf M, Schönherr S, Röder R, Ronning C, Schütt F, Mishra YK, Tiginyanu I, Adelung R, Marx J, Fiedler B, Kienle L. Improving gas sensing by CdTe decoration of individual Aerographite microtubes. Nanotechnology 2019; 30:065501. [PMID: 30523820 DOI: 10.1088/1361-6528/aaf0e7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Novel gas sensors have been realized by decorating clusters of tubular Aerographite with CdTe using magnetron sputtering techniques. Subsequently, individual microtubes were separated and electrically contacted on a SiO2/Si substrate with pre-patterned electrodes. Cathodoluminescence, electron microscopy and electrical characterization prove the successful formation of a polycrystalline CdTe thin film on Aerographite enabling an excellent gas response to ammonia. Furthermore, the dynamical response to ammonia exposure has been investigated, highlighting the quick response and recovery times of the sensor, which is highly beneficial for extremely short on/off cycles. Therefore, this gas sensor reveals a large potential for cheap, highly selective, reliable and low-power gas sensors, which are especially important for hazardous gases such as ammonia.
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Affiliation(s)
- Julian Strobel
- Institute for Materials Science, Kiel University, Kiel, Germany
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14
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Plesco I, Strobel J, Schütt F, Himcinschi C, Ben Sedrine N, Monteiro T, Correia MR, Gorceac L, Cinic B, Ursaki V, Marx J, Fiedler B, Mishra YK, Kienle L, Adelung R, Tiginyanu I. Hierarchical Aerographite 3D flexible networks hybridized by InP micro/nanostructures for strain sensor applications. Sci Rep 2018; 8:13880. [PMID: 30224739 PMCID: PMC6141564 DOI: 10.1038/s41598-018-32005-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 08/29/2018] [Indexed: 11/09/2022] Open
Abstract
In the present work, we report on development of three-dimensional flexible architectures consisting of an extremely porous three-dimensional Aerographite (AG) backbone decorated by InP micro/nanocrystallites grown by a single step hydride vapor phase epitaxy process. The systematic investigation of the hybrid materials by scanning electron microscopy demonstrates a rather uniform spatial distribution of InP crystallites without agglomeration on the surface of Aerographite microtubular structures. X-ray diffraction, transmission electron microscopy and Raman scattering analysis demonstrate that InP crystallites grown on bare Aerographite are of zincblende structure, while a preliminary functionalization of the Aerographite backbone with Au nanodots promotes the formation of crystalline In2O3 nanowires as well as gold-indium oxide core-shell nanostructures. The electromechanical properties of the hybrid AG-InP composite material are shown to be better than those of previously reported bare AG and AG-GaN networks. Robustness, elastic behavior and excellent translation of the mechanical deformation to variations in electrical conductivity highlight the prospects of AG-InP applications in tactile/strain sensors and other device structures related to flexible electronics.
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Affiliation(s)
- Irina Plesco
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, MD-2004, Chisinau, Republic of Moldova
| | - Julian Strobel
- Institute for Materials Science, Kiel University, Kaiserstr. 2, D-24143, Kiel, Germany
| | - Fabian Schütt
- Institute for Materials Science, Kiel University, Kaiserstr. 2, D-24143, Kiel, Germany
| | - Cameliu Himcinschi
- Institute of Theoretical Physics, TU Bergakademie Freiberg, Leipziger Str. 23, D-09596, Freiberg, Germany
| | - Nabiha Ben Sedrine
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro, P-3810-193, Aveiro, Portugal
| | - Teresa Monteiro
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro, P-3810-193, Aveiro, Portugal
| | - Maria Rosário Correia
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro, P-3810-193, Aveiro, Portugal
| | - Leonid Gorceac
- Department of Physics and Engineering, State University of Moldova, Alexei Mateevici str. 60, MD-2009, Chisinau, Republic of Moldova
| | - Boris Cinic
- Department of Physics and Engineering, State University of Moldova, Alexei Mateevici str. 60, MD-2009, Chisinau, Republic of Moldova
| | - Veaceslav Ursaki
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, MD-2004, Chisinau, Republic of Moldova
| | - Janik Marx
- Institute of Polymers and Composites, Hamburg University of Technology, Denickestr. 15, D-21073, Hamburg, Germany
| | - Bodo Fiedler
- Institute of Polymers and Composites, Hamburg University of Technology, Denickestr. 15, D-21073, Hamburg, Germany
| | - Yogendra Kumar Mishra
- Institute for Materials Science, Kiel University, Kaiserstr. 2, D-24143, Kiel, Germany
| | - Lorenz Kienle
- Institute for Materials Science, Kiel University, Kaiserstr. 2, D-24143, Kiel, Germany.
| | - Rainer Adelung
- Institute for Materials Science, Kiel University, Kaiserstr. 2, D-24143, Kiel, Germany.
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, MD-2004, Chisinau, Republic of Moldova.
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15
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Braniste T, Tiginyanu I, Horvath T, Raevschi S, Andrée B, Cebotari S, Boyle EC, Haverich A, Hilfiker A. Targeting Endothelial Cells with Multifunctional GaN/Fe Nanoparticles. Nanoscale Res Lett 2017; 12:486. [PMID: 28799116 PMCID: PMC5552623 DOI: 10.1186/s11671-017-2262-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 08/01/2017] [Indexed: 06/07/2023]
Abstract
In this paper, we report on the interaction of multifunctional nanoparticles with living endothelial cells. The nanoparticles were synthesized using direct growth of gallium nitride on zinc oxide nanoparticles alloyed with iron oxide followed by core decomposition in hydrogen flow at high temperature. Using transmission electron microscopy, we demonstrate that porcine aortic endothelial cells take up GaN-based nanoparticles suspended in the growth medium. The nanoparticles are deposited in vesicles and the endothelial cells show no sign of cellular damage. Intracellular inert nanoparticles are used as guiding elements for controlled transportation or designed spatial distribution of cells in external magnetic fields.
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Affiliation(s)
- Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, MD-2004 Chisinau, Republic of Moldova
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare av. 168, MD-2004 Chisinau, Republic of Moldova
| | - Tibor Horvath
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany
| | - Simion Raevschi
- Department of Physics and Engineering, State University of Moldova, str. Alexei Mateevici 60, Chisinau, MD-2009 Republic of Moldova
| | - Birgit Andrée
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany
| | - Serghei Cebotari
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany
| | - Erin C. Boyle
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany
| | - Axel Haverich
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany
| | - Andres Hilfiker
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany
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16
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Lupan O, Postica V, Gröttrup J, Mishra AK, de Leeuw NH, Carreira JFC, Rodrigues J, Ben Sedrine N, Correia MR, Monteiro T, Cretu V, Tiginyanu I, Smazna D, Mishra YK, Adelung R. Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications. ACS Appl Mater Interfaces 2017. [PMID: 28111948 DOI: 10.1002/adfm.201604676] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
In this work, the exceptionally improved sensing capability of highly porous three-dimensional (3-D) hybrid ceramic networks toward reducing gases is demonstrated for the first time. The 3-D hybrid ceramic networks are based on doped metal oxides (MexOy and ZnxMe1-xOy, Me = Fe, Cu, Al) and alloyed zinc oxide tetrapods (ZnO-T) forming numerous junctions and heterojunctions. A change in morphology of the samples and formation of different complex microstructures is achieved by mixing the metallic (Fe, Cu, Al) microparticles with ZnO-T grown by the flame transport synthesis (FTS) in different weight ratios (ZnO-T:Me, e.g., 20:1) followed by subsequent thermal annealing in air. The gas sensing studies reveal the possibility to control and change/tune the selectivity of the materials, depending on the elemental content ratio and the type of added metal oxide in the 3-D ZnO-T hybrid networks. While pristine ZnO-T networks showed a good response to H2 gas, a change/tune in selectivity to ethanol vapor with a decrease in optimal operating temperature was observed in the networks hybridized with Fe-oxide and Cu-oxide. In the case of hybridization with ZnAl2O4, an improvement of H2 gas response (to ∼7.5) was reached at lower doping concentrations (20:1), whereas the increase in concentration of ZnAl2O4 (ZnO-T:Al, 10:1), the selectivity changes to methane CH4 gas (response is about 28). Selectivity tuning to different gases is attributed to the catalytic properties of the metal oxides after hybridization, while the gas sensitivity improvement is mainly associated with additional modulation of the electrical resistance by the built-in potential barriers between n-n and n-p heterojunctions, during adsorption and desorption of gaseous species. Density functional theory based calculations provided the mechanistic insights into the interactions between different hybrid networks and gas molecules to support the experimentally observed results. The studied networked materials and sensor structures performances would provide particular advantages in the field of fundamental research, applied physics studies, and industrial and ecological applications.
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Affiliation(s)
- O Lupan
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
- Department of Microelectronics and Biomedical Engineering, Technical University of Moldova , 168 Stefan cel Mare Avenue, MD-2004 Chisinau, Republic of Moldova
| | - V Postica
- Department of Microelectronics and Biomedical Engineering, Technical University of Moldova , 168 Stefan cel Mare Avenue, MD-2004 Chisinau, Republic of Moldova
| | - J Gröttrup
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
| | - A K Mishra
- Department of Chemistry, University College London , 20 Gordon Street, London WC1H 0AJ, United Kingdom
- Research & Development, University of Petroleum and Energy Studies (UPES) , Bidholi, Dehradun 248007, India
| | - N H de Leeuw
- Department of Chemistry, University College London , 20 Gordon Street, London WC1H 0AJ, United Kingdom
- School of Chemistry, Cardiff University , Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
| | - J F C Carreira
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - J Rodrigues
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - N Ben Sedrine
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - M R Correia
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - T Monteiro
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - V Cretu
- Department of Microelectronics and Biomedical Engineering, Technical University of Moldova , 168 Stefan cel Mare Avenue, MD-2004 Chisinau, Republic of Moldova
| | - I Tiginyanu
- Department of Microelectronics and Biomedical Engineering, Technical University of Moldova , 168 Stefan cel Mare Avenue, MD-2004 Chisinau, Republic of Moldova
| | - D Smazna
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
| | - Y K Mishra
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
| | - R Adelung
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
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17
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Lupan O, Postica V, Gröttrup J, Mishra AK, de Leeuw NH, Carreira JFC, Rodrigues J, Ben Sedrine N, Correia MR, Monteiro T, Cretu V, Tiginyanu I, Smazna D, Mishra YK, Adelung R. Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications. ACS Appl Mater Interfaces 2017; 9:4084-4099. [PMID: 28111948 DOI: 10.1021/acsami.6b11337] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In this work, the exceptionally improved sensing capability of highly porous three-dimensional (3-D) hybrid ceramic networks toward reducing gases is demonstrated for the first time. The 3-D hybrid ceramic networks are based on doped metal oxides (MexOy and ZnxMe1-xOy, Me = Fe, Cu, Al) and alloyed zinc oxide tetrapods (ZnO-T) forming numerous junctions and heterojunctions. A change in morphology of the samples and formation of different complex microstructures is achieved by mixing the metallic (Fe, Cu, Al) microparticles with ZnO-T grown by the flame transport synthesis (FTS) in different weight ratios (ZnO-T:Me, e.g., 20:1) followed by subsequent thermal annealing in air. The gas sensing studies reveal the possibility to control and change/tune the selectivity of the materials, depending on the elemental content ratio and the type of added metal oxide in the 3-D ZnO-T hybrid networks. While pristine ZnO-T networks showed a good response to H2 gas, a change/tune in selectivity to ethanol vapor with a decrease in optimal operating temperature was observed in the networks hybridized with Fe-oxide and Cu-oxide. In the case of hybridization with ZnAl2O4, an improvement of H2 gas response (to ∼7.5) was reached at lower doping concentrations (20:1), whereas the increase in concentration of ZnAl2O4 (ZnO-T:Al, 10:1), the selectivity changes to methane CH4 gas (response is about 28). Selectivity tuning to different gases is attributed to the catalytic properties of the metal oxides after hybridization, while the gas sensitivity improvement is mainly associated with additional modulation of the electrical resistance by the built-in potential barriers between n-n and n-p heterojunctions, during adsorption and desorption of gaseous species. Density functional theory based calculations provided the mechanistic insights into the interactions between different hybrid networks and gas molecules to support the experimentally observed results. The studied networked materials and sensor structures performances would provide particular advantages in the field of fundamental research, applied physics studies, and industrial and ecological applications.
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Affiliation(s)
- O Lupan
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
- Department of Microelectronics and Biomedical Engineering, Technical University of Moldova , 168 Stefan cel Mare Avenue, MD-2004 Chisinau, Republic of Moldova
| | - V Postica
- Department of Microelectronics and Biomedical Engineering, Technical University of Moldova , 168 Stefan cel Mare Avenue, MD-2004 Chisinau, Republic of Moldova
| | - J Gröttrup
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
| | - A K Mishra
- Department of Chemistry, University College London , 20 Gordon Street, London WC1H 0AJ, United Kingdom
- Research & Development, University of Petroleum and Energy Studies (UPES) , Bidholi, Dehradun 248007, India
| | - N H de Leeuw
- Department of Chemistry, University College London , 20 Gordon Street, London WC1H 0AJ, United Kingdom
- School of Chemistry, Cardiff University , Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
| | - J F C Carreira
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - J Rodrigues
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - N Ben Sedrine
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - M R Correia
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - T Monteiro
- Department of Physics and I3N, Institute for Nanostructures, Nanomodelling and Nanofabrication, University of Aveiro , 3810-193 Aveiro, Portugal
| | - V Cretu
- Department of Microelectronics and Biomedical Engineering, Technical University of Moldova , 168 Stefan cel Mare Avenue, MD-2004 Chisinau, Republic of Moldova
| | - I Tiginyanu
- Department of Microelectronics and Biomedical Engineering, Technical University of Moldova , 168 Stefan cel Mare Avenue, MD-2004 Chisinau, Republic of Moldova
| | - D Smazna
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
| | - Y K Mishra
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
| | - R Adelung
- Functional Nanomaterials, Institute for Materials Science, Kiel University , Kaiserstrasse 2, D-24143, Kiel, Germany
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18
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Plesco I, Postolache V, Volodina G, Zalamai V, Ghimpu L, Tiginyanu I. Synthesis and characterization of photosensible CH3NH3PbI3 and CH3NH3PbI3–x Cl x perovskite crystalline films. Surf Engin Appl Electrochem 2017. [DOI: 10.3103/s1068375517010100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Dragoman M, Ghimpu L, Obreja C, Dinescu A, Plesco I, Dragoman D, Braniste T, Tiginyanu I. Ultra-lightweight pressure sensor based on graphene aerogel decorated with piezoelectric nanocrystalline films. Nanotechnology 2016; 27:475203. [PMID: 27781998 DOI: 10.1088/0957-4484/27/47/475203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
In this paper, we report on a pressure sensor based on graphene aerogel functionalized with SnO2 or GaN thin films deposited by magnetron sputtering. Decoration by nanocrystalline SnO2 or GaN was found to enhance the piezoresistive response of the bare aerogel. The responsivity and pressure sensing range (from 1-5 atm) of the sensor are shown to be higher than those inherent in pressure sensors based on graphene membranes.
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Affiliation(s)
- Mircea Dragoman
- National Research and Development Institute in Microtechnology, Str. Erou Iancu Nicolae 126A, Bucharest 077190, Romania
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20
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Aleinicov E, Ioisher A, Makhnovskiy D, Postolache V, Tiginyanu I, Ursaki V. Magnetic properties of microwires and filiform nanostructures with elongated magnetic inclusions. Surf Engin Appl Electrochem 2016. [DOI: 10.3103/s1068375516060028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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21
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Enachi M, Guix M, Postolache V, Ciobanu V, Fomin VM, Schmidt OG, Tiginyanu I. Light-Induced Motion of Microengines Based on Microarrays of TiO 2 Nanotubes. Small 2016; 12:5497-5505. [PMID: 27593218 DOI: 10.1002/smll.201601680] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/10/2016] [Indexed: 06/06/2023]
Abstract
An electrochemical approach for manufacturing light-driven nanostructured titanium dioxide (TiO2 ) microengines with controlled spatial architecture for improved performance is reported. The microengines based on microscale arrays of TiO2 nanotubes with variable (50-120 nm) inner diameter show a quasi-ordered arrangement of nanotubes, being the smallest tubular entities for catalytic microengines reported to date. The nanotubes exhibit well defined crystalline phases depending upon the postfabrication annealing conditions that determine the microengines' efficiency. When exposed to UV-light, the microarrays of TiO2 nanotubes exhibiting conical internal shapes show directed motion in confined space, both in the presence and absence of hydrogen peroxide. In the former case, two different motion patterns related to diffusiophoresis and localized nanobubble generation inside of the tubes due to the photocatalytic decomposition of H2 O2 are disclosed. Controlled pick-up, transport, and release of individual and agglomerated particles are demonstrated using the UV light irradiation of microengines. The obtained results show that light-driven microengines based on microarrays of TiO2 nanotubes represent a promising platform for controlled micro/nanoscale sample transportation in fluids as well as for environmental applications, in particular, for the enhanced photocatalytic degradation of organic pollutants due to the improved intermixing taking place during the motion of TiO2 microengines.
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Affiliation(s)
- Mihail Enachi
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare av., MD-2004, Chisinau, Republic of Moldova
| | - Maria Guix
- IFW Dresden, Institute for Integrative Nanosciences (IIN), 20 Helmholtzstraße, D-01069, Dresden, Germany.
| | - Vitalie Postolache
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare av., MD-2004, Chisinau, Republic of Moldova
| | - Vladimir Ciobanu
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare av., MD-2004, Chisinau, Republic of Moldova
| | - Vladimir M Fomin
- IFW Dresden, Institute for Integrative Nanosciences (IIN), 20 Helmholtzstraße, D-01069, Dresden, Germany
| | - Oliver G Schmidt
- IFW Dresden, Institute for Integrative Nanosciences (IIN), 20 Helmholtzstraße, D-01069, Dresden, Germany
| | - Ion Tiginyanu
- Institute of Electronic Engineering and Nanotechnologies, Academy of Sciences of Moldova (ASM), 5 Academiei str., MD-2028, Chisinau, Republic of Moldova
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22
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Braniste T, Tiginyanu I, Horvath T, Raevschi S, Cebotari S, Lux M, Haverich A, Hilfiker A. Viability and proliferation of endothelial cells upon exposure to GaN nanoparticles. Beilstein J Nanotechnol 2016; 7:1330-1337. [PMID: 27826507 PMCID: PMC5082458 DOI: 10.3762/bjnano.7.124] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 09/06/2016] [Indexed: 06/06/2023]
Abstract
Nanotechnology is a rapidly growing and promising field of interest in medicine; however, nanoparticle-cell interactions are not yet fully understood. The goal of this work was to examine the interaction between endothelial cells and gallium nitride (GaN) semiconductor nanoparticles. Cellular viability, adhesion, proliferation, and uptake of nanoparticles by endothelial cells were investigated. The effect of free GaN nanoparticles versus the effect of growing endothelial cells on GaN functionalized surfaces was examined. To functionalize surfaces with GaN, GaN nanoparticles were synthesized on a sacrificial layer of zinc oxide (ZnO) nanoparticles using hydride vapor phase epitaxy. The uptake of GaN nanoparticles by porcine endothelial cells was strongly dependent upon whether they were fixed to the substrate surface or free floating in the medium. The endothelial cells grown on surfaces functionalized with GaN nanoparticles demonstrated excellent adhesion and proliferation, suggesting good biocompatibility of the nanostructured GaN.
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Affiliation(s)
- Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, bv. Stefan cel Mare 168, MD-2004 Chisinau, Republic of Moldova
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl Neuberg Str. 1, D-30625 Hannover, Germany
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, bv. Stefan cel Mare 168, MD-2004 Chisinau, Republic of Moldova
| | - Tibor Horvath
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl Neuberg Str. 1, D-30625 Hannover, Germany
| | - Simion Raevschi
- Department of Physics and Engineering, State University of Moldova, str. Alexe Mateevici 60, MD-2009 Chisinau, Republic of Moldova
| | - Serghei Cebotari
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl Neuberg Str. 1, D-30625 Hannover, Germany
| | - Marco Lux
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl Neuberg Str. 1, D-30625 Hannover, Germany
| | - Axel Haverich
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl Neuberg Str. 1, D-30625 Hannover, Germany
| | - Andres Hilfiker
- Leibniz Research Laboratories for Biotechnology and Artificial Organs (LEBAO), Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl Neuberg Str. 1, D-30625 Hannover, Germany
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Abstract
We show that ultrathin GaN membranes, with a thickness of 15 nm and planar dimensions of 12 × 184 μm(2), act as memristive devices. The memristive behavior is due to the migration of the negatively-charged deep traps, which form in the volume of the membrane during the fabrication process, towards the unoccupied surface states of the suspended membranes. The time constant of the migration process is of the order of tens of seconds and varies with the current or voltage sweep.
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Affiliation(s)
- Mircea Dragoman
- National Research and Development Institute in Microtechnology, Str. Erou Iancu Nicolae 126A, Bucharest 077190, Romania
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24
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Ghimpu L, Potlog T, Resmerita AM, Tiginyanu I, Farcas A. Structure and morphology of nanoporous zno and dark current-Voltage characteristics of the glass/(TCO)/zno/poly[2,7-(9,9-dioctylfluorene)- alt-(5,5'-bithiophene)/ag structure. J Appl Polym Sci 2015. [DOI: 10.1002/app.42415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Lidia Ghimpu
- Institute of Electronic Engineering and Nanotechnologies; Academy of Sciences of Moldova; MD-2028 Chisinau Republic of Moldova
| | - Tamara Potlog
- Moldova State University; Chisinau MD-2009 Republic of Moldova
| | - Ana-Maria Resmerita
- ‘‘Petru Poni’’ Institute of Macromolecular Chemistry; Gr. Ghica Voda Alley 41A 700487 Iasi Romania
| | - Ion Tiginyanu
- Institute of Electronic Engineering and Nanotechnologies; Academy of Sciences of Moldova; MD-2028 Chisinau Republic of Moldova
| | - Aurica Farcas
- ‘‘Petru Poni’’ Institute of Macromolecular Chemistry; Gr. Ghica Voda Alley 41A 700487 Iasi Romania
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Enachi M, Guix M, Braniste T, Postolache V, Ciobanu V, Ursaki V, Schmidt OG, Tiginyanu I. Photocatalytic properties of TiO2 nanotubes doped with Ag, Au and Pt or covered by Ag, Au and Pt nanodots. Surf Engin Appl Electrochem 2015. [DOI: 10.3103/s1068375515010044] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Monaico E, Tiginyanu I, Volciuc O, Mehrtens T, Rosenauer A, Gutowski J, Nielsch K. Formation of InP nanomembranes and nanowires under fast anodic etching of bulk substrates. Electrochem commun 2014. [DOI: 10.1016/j.elecom.2014.07.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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27
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Ioisher A, Badinter E, Monaico E, Postolache V, Hartnagel HL, Leporda N, Tiginyanu I. Integration of Ge nanowire arrays in glass micro-fibers. Surf Engin Appl Electrochem 2011. [DOI: 10.3103/s1068375511020062] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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