1
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Zheng D, Pisano F, Collard L, Balena A, Pisanello M, Spagnolo B, Mach-Batlle R, Tantussi F, Carbone L, De Angelis F, Valiente M, de la Prida LM, Ciracì C, De Vittorio M, Pisanello F. Toward Plasmonic Neural Probes: SERS Detection of Neurotransmitters through Gold-Nanoislands-Decorated Tapered Optical Fibers with Sub-10 nm Gaps. Adv Mater 2023; 35:e2200902. [PMID: 36479741 DOI: 10.1002/adma.202200902] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 10/21/2022] [Indexed: 06/17/2023]
Abstract
Integration of plasmonic nanostructures with fiber-optics-based neural probes enables label-free detection of molecular fingerprints via surface-enhanced Raman spectroscopy (SERS), and it represents a fascinating technological horizon to investigate brain function. However, developing neuroplasmonic probes that can interface with deep brain regions with minimal invasiveness while providing the sensitivity to detect biomolecular signatures in a physiological environment is challenging, in particular because the same waveguide must be employed for both delivering excitation light and collecting the resulting scattered photons. Here, a SERS-active neural probe based on a tapered optical fiber (TF) decorated with gold nanoislands (NIs) that can detect neurotransmitters down to the micromolar range is presented. To do this, a novel, nonplanar repeated dewetting technique to fabricate gold NIs with sub-10 nm gaps, uniformly distributed on the wide (square millimeter scale in surface area), highly curved surface of TF is developed. It is experimentally and numerically shown that the amplified broadband near-field enhancement of the high-density NIs layer allows for achieving a limit of detection in aqueous solution of 10-7 m for rhodamine 6G and 10-5 m for serotonin and dopamine through SERS at near-infrared wavelengths. The NIs-TF technology is envisioned as a first step toward the unexplored frontier of in vivo label-free plasmonic neural interfaces.
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Affiliation(s)
- Di Zheng
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
| | - Filippo Pisano
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
| | - Liam Collard
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
| | - Antonio Balena
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
| | - Marco Pisanello
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
| | - Barbara Spagnolo
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
| | - Rosa Mach-Batlle
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
| | - Francesco Tantussi
- Istituto Italiano di Tecnologia, Center for Convergent Technologies, Genova, 16163, Italy
| | - Luigi Carbone
- CNR NANOTEC - Institute of Nanotechnology, University of Salento, Lecce, 73100, Italy
| | - Francesco De Angelis
- Istituto Italiano di Tecnologia, Center for Convergent Technologies, Genova, 16163, Italy
| | - Manuel Valiente
- Brain Metastasis Group, Spanish National Cancer Research Center (CNIO), Madrid, 28029, Spain
| | | | - Cristian Ciracì
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
| | - Massimo De Vittorio
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
- Dipartimento di Ingegneria Dell'Innovazione, Università del Salento, Lecce, 73100, Italy
| | - Ferruccio Pisanello
- Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, Arnesano, LE, 73010, Italy
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2
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Motyčková L, Arregi JA, Staňo M, Průša S, Částková K, Uhlíř V. Preserving Metamagnetism in Self-Assembled FeRh Nanomagnets. ACS Appl Mater Interfaces 2023; 15:8653-8665. [PMID: 36720004 PMCID: PMC10016751 DOI: 10.1021/acsami.2c20107] [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] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 01/18/2023] [Indexed: 05/26/2023]
Abstract
Preparing and exploiting phase-change materials in the nanoscale form is an ongoing challenge for advanced material research. A common lasting obstacle is preserving the desired functionality present in the bulk form. Here, we present self-assembly routes of metamagnetic FeRh nanoislands with tunable sizes and shapes. While the phase transition between antiferromagnetic and ferromagnetic orders is largely suppressed in nanoislands formed on oxide substrates via thermodynamic nucleation, we find that nanomagnet arrays formed through solid-state dewetting keep their metamagnetic character. This behavior is strongly dependent on the resulting crystal faceting of the nanoislands, which is characteristic of each assembly route. Comparing the calculated surface energies for each magnetic phase of the nanoislands reveals that metamagnetism can be suppressed or allowed by specific geometrical configurations of the facets. Furthermore, we find that spatial confinement leads to very pronounced supercooling and the absence of phase separation in the nanoislands. Finally, the supported nanomagnets are chemically etched away from the substrates to inspect the phase transition properties of self-standing nanoparticles. We demonstrate that solid-state dewetting is a feasible and scalable way to obtain supported and free-standing FeRh nanomagnets with preserved metamagnetism.
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Affiliation(s)
- Lucie Motyčková
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
| | - Jon Ander Arregi
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
| | - Michal Staňo
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
| | - Stanislav Průša
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
- Institute
of Physical Engineering, Brno University
of Technology, Technická
2, 616 69Brno, Czech Republic
| | - Klára Částková
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
- Department
of Ceramics and Polymers, Brno University
of Technology, Technická
2, 616 69Brno, Czech Republic
| | - Vojtěch Uhlíř
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
- Institute
of Physical Engineering, Brno University
of Technology, Technická
2, 616 69Brno, Czech Republic
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3
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L'Etoile MA, Wang B, Cumston Q, Warren AP, Ginn JC, Barmak K, Coffey KR, Carter WC, Thompson CV. Experimental and Computational Study of the Orientation Dependence of Single-Crystal Ruthenium Nanowire Stability. Nano Lett 2022; 22:9958-9963. [PMID: 36511687 DOI: 10.1021/acs.nanolett.2c03529] [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] [Indexed: 06/17/2023]
Abstract
Single-crystal nanowires are of broad interest for applications in nanotechnology. However, such wires are subject to both the Rayleigh-Plateau instability and an ovulation process that are expected to lead to their break up into particle arrays. Single crystal Ru nanowires were fabricated with axes lying along different crystallographic orientations. Wires bound by equilibrium facets along their length did not break up through either a Rayleigh-Plateau or ovulation process, while wires with other orientations broke up through a combination of both. Mechanistic insight is provided using a level-set simulation that accounts for strongly anisotropic surface energies, providing a framework for design of morphologically stable nanostructures.
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Affiliation(s)
- Maxwell A L'Etoile
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Baoming Wang
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Quintin Cumston
- Department of Materials Science and Engineering and Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | | | - James C Ginn
- Plasmonics, Inc., Orlando, Florida 32826, United States
| | - Katayun Barmak
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
| | - Kevin R Coffey
- Department of Materials Science and Engineering and Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - W Craig Carter
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Carl V Thompson
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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4
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Zarzycki A, Perzanowski M, Krupinski M, Marszalek M. Solid-State Dewetting as a Driving Force for Structural Transformation and Magnetization Reversal Mechanism in FePd Thin Films. Materials (Basel) 2022; 16:92. [PMID: 36614431 PMCID: PMC9821688 DOI: 10.3390/ma16010092] [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: 11/24/2022] [Revised: 12/15/2022] [Accepted: 12/17/2022] [Indexed: 06/17/2023]
Abstract
In this work, the process of solid-state dewetting in FePd thin films and its influence on structural transformation and magnetic properties is presented. The morphology, structure and magnetic properties of the FePd system subjected to annealing at 600 °C for different times were studied. The analysis showed a strong correlation between the dewetting process and various physical phenomena. In particular, the transition between the A1 phase and L10 phase is strongly influenced by and inextricably connected with solid-state dewetting. Major changes were observed when the film lost its continuity, including a fast growth of the L10 phase, changes in the magnetization reversal behavior or the induction of magnetic spring-like behavior.
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Bonvicini SN, Fu B, Fulton AJ, Jia Z, Shi Y. Formation of Au, Pt, and bimetallic Au-Pt nanostructures from thermal dewetting of single-layer or bilayer thin films. Nanotechnology 2022; 33:235604. [PMID: 35240581 DOI: 10.1088/1361-6528/ac5a83] [Citation(s) in RCA: 3] [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: 12/29/2021] [Accepted: 03/03/2022] [Indexed: 06/14/2023]
Abstract
Formation of Au, Pt, and bimetallic Au-Pt nanostructures by thermal dewetting of single-layer Au, Pt and bilayer Au-Pt thin films on Si substrates was systematically studied. The solid-state dewetting of both single-layer and bilayer metallic films was shown to go through heterogeneous void initiation followed by void growth via capillary agglomeration. For the single-layer of Au and Pt films, the void growth started at a temperature right above the Hüttig temperature, at which the atoms at the surface or at defects become mobile. Uniformly distributed Au (7 ± 1 nm to 33 ± 8 nm) and Pt (7 ± 1 nm) NPs with monodispersed size distributions were produced from complete dewetting achieved for thinner 1.7-5.5 nm thick Au and 1.4 nm thick Pt films, respectively. The NP size is strongly dependent on the initial thin film thickness, but less so on temperature and time. Thermal dewetting of Au-Pt bilayer films resulted in partial dewetting only, forming isolated nano-islands or large particles, regardless of sputtering order and total thin film thickness. The increased resistance to thermal dewetting shown in the Au-Pt bilayer films as compared to the individual Au or Pt layer is a reflection of the stabilizing effect that occurs upon adding Pt to Au in the bimetallic system. Energy dispersive x-ray spectroscopic analysis showed that the two metals in the bilayer films broke up together instead of dewetting individually. According to the x-ray diffraction analysis, the produced Au-Pt nanostructures are phase-segregated, consisting of an Au-rich phase and a Pt-rich phase.
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Affiliation(s)
| | - Bo Fu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, People's Republic of China
| | - Alison Joy Fulton
- Department of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - Zhitai Jia
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, People's Republic of China
| | - Yujun Shi
- Department of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada
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Barrera G, Celegato F, Cialone M, Coïsson M, Rizzi P, Tiberto P. Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe 70Pd 30 Nanoparticles Obtained by the Solid-State Dewetting. Sensors (Basel) 2021; 21:7420. [PMID: 34770724 PMCID: PMC8588453 DOI: 10.3390/s21217420] [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: 09/30/2021] [Revised: 11/04/2021] [Accepted: 11/05/2021] [Indexed: 12/17/2022]
Abstract
Advances in nanofabrication techniques are undoubtedly needed to obtain nanostructured magnetic materials with physical and chemical properties matching the pressing and relentless technological demands of sensors. Solid-state dewetting is known to be a low-cost and "top-down" nanofabrication technique able to induce a controlled morphological transformation of a continuous thin film into an ordered nanoparticle array. Here, magnetic Fe70Pd30 thin film with 30 nm thickness is deposited by the co-sputtering technique on a monocrystalline (MgO) or amorphous (Si3N4) substrate and, subsequently, annealed to promote the dewetting process. The different substrate properties are able to tune the activation thermal energy of the dewetting process, which can be tuned by depositing on substrates with different microstructures. In this way, it is possible to tailor the final morphology of FePd nanoparticles as observed by advanced microscopy techniques (SEM and AFM). The average size and height of the nanoparticles are in the ranges 150-300 nm and 150-200 nm, respectively. Moreover, the induced spatial confinement of magnetic materials in almost-spherical nanoparticles strongly affects the magnetic properties as observed by in-plane and out-of-plane hysteresis loops. Magnetization reversal in dewetted FePd nanoparticles is mainly characterized by a rotational mechanism leading to a slower approach to saturation and smaller value of the magnetic susceptibility than the as-deposited thin film.
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Affiliation(s)
- Gabriele Barrera
- Advanced Materials Metrology and Life Sciences, Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce 91, I-10135 Torino, Italy; (F.C.); (M.C.); (P.T.)
| | - Federica Celegato
- Advanced Materials Metrology and Life Sciences, Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce 91, I-10135 Torino, Italy; (F.C.); (M.C.); (P.T.)
| | - Matteo Cialone
- CNR SPIN Genova, c.so F. M. Perrone 24, I-16152 Genova, Italy;
| | - Marco Coïsson
- Advanced Materials Metrology and Life Sciences, Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce 91, I-10135 Torino, Italy; (F.C.); (M.C.); (P.T.)
| | - Paola Rizzi
- Chemistry Department and NIS, Università di Torino, Via Pietro Giuria 7, I-10125 Torino, Italy;
| | - Paola Tiberto
- Advanced Materials Metrology and Life Sciences, Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce 91, I-10135 Torino, Italy; (F.C.); (M.C.); (P.T.)
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7
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Ly LQ, Fulton AJ, Bonvicini SN, Shi Y. Pulsed laser-induced dewetting and thermal dewetting of Ag thin films for the fabrication of Ag nanoparticles. Nanotechnology 2021; 32:335301. [PMID: 33962401 DOI: 10.1088/1361-6528/abfee7] [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] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 05/07/2021] [Indexed: 06/12/2023]
Abstract
Two different dewetting methods, namely pulsed laser-induced dewetting (PLiD)-a liquid-state dewetting process and thermal dewetting (TD)-a solid-state dewetting process, have been systematically explored for Ag thin films (1.9-19.8 nm) on Si substrates for the fabrication of Ag nanoparticles (NPs) and the understanding of dewetting mechanisms. The effect of laser fluence and irradiation time in PLiD and temperature and duration in TD were investigated. A comparison of the produced Ag NP size distributions using the two methods of PLiD and TD has shown that both produce Ag NPs of similar size with better size uniformity for thinner films (<6 nm), whereas TD produced bigger Ag NPs for thicker films (≥8-10 nm) as compared to PLiD. As the film thickness increases, the Ag NP size distributions from both PLiD and TD show a deviation from the unimodal distributions, leading to a bimodal distribution. The PLiD process is governed by the mechanism of nucleation and growth of holes due to the formation of many nano-islands from the Volmer-Weber growth of thin films during the sputtering process. The investigation of thickness-dependent NP size in TD leads to the understanding of void initiation due to pore nucleation at the film-substrate interface. Furthermore, the linear dependence of NP size on thickness in TD provides direct evidence of fingering instability, which leads to the branched growth of voids.
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Affiliation(s)
- Linh Quy Ly
- Department of Chemistry, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Alison Joy Fulton
- Department of Chemistry, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | | | - Yujun Shi
- Department of Chemistry, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
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Oliva-Ramírez M, Wang D, Flock D, Rico V, González-Elipe AR, Schaaf P. Solid-State Dewetting of Gold on Stochastically Periodic SiO 2 Nanocolumns Prepared by Oblique Angle Deposition. ACS Appl Mater Interfaces 2021; 13:11385-11395. [PMID: 33590763 DOI: 10.1021/acsami.0c19327] [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] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Solid-state dewetting (SSD) on patterned substrates is a straightforward method for fabricating ordered arrays of metallic nanoparticles on surfaces. However, a drawback of this procedure is that the patterning of substrates usually requires time-consuming and expensive two-dimensional (2D) fabrication methods. Nanostructured thin films deposited by oblique angle deposition (OAD) present at the surface a form of stochastically arranged periodic bundles of nanocolumns that might act as a patterned template for fabricating arrays of nanoparticles by SSD. In this work, we explore this concept and investigate the effect of three different types of OAD SiO2 thin films on the SSD of Au deposited on their surface. We demonstrate that the size and spatial distribution of the particles can be tailored through the surface morphology of these OAD film substrates. It has been found that the SSD of the evaporated Au layer gives rise to a bimodal size distribution of particles. A majority of them appeared as mesoparticles with sizes ≳100 nm and the rest as nanoparticles with ∼10 nm, respectively, located either on top of the nanocolumns following their lateral distribution (i.e., resulting from a patterning effect) or incorporated inside the open mesopores existing among them. Moreover, on the SiO2-OAD thin films where interconnected nanocolumnar bundles arrange in the form of discrete motifs, the patterning effect gave rise to the formation of approximately one Au mesoparticle per motif, which is one of the assets of patterned SSD. The morphological, optical (i.e., plasmon resonance), and crystalline structural characteristics of Au mesoparticles suggest that the interplay between a discontinuous nanocolumnar surface acting as a template and the poor adhesion of Au onto SiO2 are key factors for the observed template effect controlling the SSD on the surface of OAD thin films.
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Affiliation(s)
- Manuel Oliva-Ramírez
- Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering and Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, 98693 Ilmenau, Germany
| | - Dong Wang
- Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering and Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, 98693 Ilmenau, Germany
| | - Dominik Flock
- Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering and Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, 98693 Ilmenau, Germany
| | - Víctor Rico
- Institute of Materials Science of Seville (CSIC), Américo Vespucio 49, 41092 Seville, Spain
| | | | - Peter Schaaf
- Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering and Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, 98693 Ilmenau, Germany
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Shahvaranfard F, Ghigna P, Minguzzi A, Wierzbicka E, Schmuki P, Altomare M. Dewetting of PtCu Nanoalloys on TiO 2 Nanocavities Provides a Synergistic Photocatalytic Enhancement for Efficient H 2 Evolution. ACS Appl Mater Interfaces 2020; 12:38211-38221. [PMID: 32706239 DOI: 10.1021/acsami.0c10968] [Citation(s) in RCA: 8] [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] [Indexed: 06/11/2023]
Abstract
We investigate the co-catalytic activity of PtCu alloy nanoparticles for photocatalytic H2 evolution from methanol-water solutions. To produce the photocatalysts, a few-nanometer-thick Pt-Cu bilayers are deposited on anodic TiO2 nanocavity arrays and converted by solid-state dewetting via a suitable thermal treatment into bimetallic PtCu nanoparticles. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results prove the formation of PtCu nanoalloys that carry a shell of surface oxides. X-ray absorption near-edge structure (XANES) data support Pt and Cu alloying and indicate the presence of lattice disorder in the PtCu nanoparticles. The PtCu co-catalyst on TiO2 shows a synergistic activity enhancement and a significantly higher activity toward photocatalytic H2 evolution than Pt- or Cu-TiO2. We propose the enhanced activity to be due to Pt-Cu electronic interactions, where Cu increases the electron density on Pt, favoring a more efficient electron transfer for H2 evolution. In addition, Cu can further promote the photoactivity by providing additional surface catalytic sites for hydrogen recombination. Remarkably, when increasing the methanol concentration up to 50 vol % in the reaction phase, we observe for PtCu-TiO2 a steeper activity increase compared to Pt-TiO2. A further increase in methanol concentration (up to 80 vol %) causes for Pt-TiO2 a clear activity decay, while PtCu-TiO2 still maintains a high level of activity. This suggests improved robustness of PtCu nanoalloys against poisoning from methanol oxidation products such as CO.
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Affiliation(s)
- Fahimeh Shahvaranfard
- Institute for Surface Science and Corrosion WW4-LKO, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
| | - Paolo Ghigna
- Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 13, 27100 Pavia, Italy
| | - Alessandro Minguzzi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milan, Italy
| | - Ewa Wierzbicka
- Institute for Surface Science and Corrosion WW4-LKO, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
| | - Patrik Schmuki
- Institute for Surface Science and Corrosion WW4-LKO, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
- Chemistry Department, Faculty of Sciences, King Abdulaziz University, 80203 Jeddah, Kingdom of Saudi Arabia
| | - Marco Altomare
- Institute for Surface Science and Corrosion WW4-LKO, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
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Kwak J, Lee W, Kim JB, Bae SI, Jeong KH. Fiber-optic plasmonic probe with nanogap-rich Au nanoislands for on-site surface-enhanced Raman spectroscopy using repeated solid-state dewetting. J Biomed Opt 2019; 24:1-6. [PMID: 30873763 PMCID: PMC6975223 DOI: 10.1117/1.jbo.24.3.037001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 01/02/2019] [Indexed: 05/14/2023]
Abstract
We report a fiber-optic plasmonic probe with nanogap-rich gold nanoislands for on-site surface-enhanced Raman spectroscopy (SERS). The plasmonic probe features nanogap-rich Au nanoislands on the top surface of a single multimode fiber. Au nanoislands were monolithically fabricated using repeated solid-state dewetting of thermally evaporated Au thin film. The plasmonic probe shows 7.8 × 106 in SERS enhancement factor and 100 nM in limit-of-detection for crystal violet under both the excitation of laser light and the collection of SERS signals through the optical fiber. The fiber-through measurement also demonstrates the label-free SERS detection of folic acid at micromolar level. The plasmonic probe can provide a tool for on-site and in vivo SERS applications.
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Affiliation(s)
- Jihyun Kwak
- Korea Advanced Institute of Science and Technology (KAIST), Department of Bio and Brain Engineering, Daejeon, Republic of Korea
- Korea Advanced Institute of Science and Technology (KAIST), KAIST Institute for Health Science and Technology, Daejeon, Republic of Korea
| | - Wonkyoung Lee
- Korea Advanced Institute of Science and Technology (KAIST), Department of Bio and Brain Engineering, Daejeon, Republic of Korea
- Korea Advanced Institute of Science and Technology (KAIST), KAIST Institute for Health Science and Technology, Daejeon, Republic of Korea
- Electronics and Telecommunications Research Institute, Daejeon, Republic of Korea
| | - Jae-Beom Kim
- Korea Advanced Institute of Science and Technology (KAIST), Department of Bio and Brain Engineering, Daejeon, Republic of Korea
- Korea Advanced Institute of Science and Technology (KAIST), KAIST Institute for Health Science and Technology, Daejeon, Republic of Korea
| | - Sang-In Bae
- Korea Advanced Institute of Science and Technology (KAIST), Department of Bio and Brain Engineering, Daejeon, Republic of Korea
- Korea Advanced Institute of Science and Technology (KAIST), KAIST Institute for Health Science and Technology, Daejeon, Republic of Korea
| | - Ki-Hun Jeong
- Korea Advanced Institute of Science and Technology (KAIST), Department of Bio and Brain Engineering, Daejeon, Republic of Korea
- Korea Advanced Institute of Science and Technology (KAIST), KAIST Institute for Health Science and Technology, Daejeon, Republic of Korea
- Address all correspondence to Ki-Hun Jeong, E-mail:
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11
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Kunwar S, Pandey P, Sui M, Bastola S, Lee J. Morphological and optical properties of Pd xAg 1-x alloy nanoparticles. Sci Technol Adv Mater 2018; 19:160-173. [PMID: 29511394 PMCID: PMC5827785 DOI: 10.1080/14686996.2018.1435944] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 01/30/2018] [Accepted: 01/30/2018] [Indexed: 05/29/2023]
Abstract
Alloy nanoparticles (NPs) can offer a wide range of opportunities for various applications due to their composition and structure dependent properties such as multifunctionality, electronic heterogeneity, site-specific response, and multiple plasmon resonance bands. In this work, the fabrication of self-assembled PdxAg1-x NPs alloy nanostructures with distinct size, density, shape, and composition is demonstrated via the solid-state dewetting of sputtered Pd/Ag thin films on c-plane sapphire. The initial stage of bilayer dewetting exhibits the nucleation of voids, followed by the expansion of voids and cluster breakdown and finally shape transformation along with the temperature control. Bilayer composition shows a substantial influence on the dewetting such that the overall dewetting is enhanced along with the increased Ag composition, i.e. Pd0.25Ag0.75 > Pd0.5Ag0.5 > Pd0.75Ag0.25. On the other hand, the size and density of NPs can be efficiently controlled by varying the initial thickness of bilayers. Reflectance peaks in UV and near-infrared (NIR) regions and a wide absorption band in the visible region arisen from the surface plasmon resonance are observed in reflectance spectra. The peak intensity depends on the composition of PdxAg1-x NPs and the NIR peaks gradually blue-shift with the size decrement.
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Affiliation(s)
- Sundar Kunwar
- College of Electronics and Information, Kwangwoon University, Seoul, South Korea
| | - Puran Pandey
- College of Electronics and Information, Kwangwoon University, Seoul, South Korea
| | - Mao Sui
- College of Electronics and Information, Kwangwoon University, Seoul, South Korea
| | - Sushil Bastola
- College of Electronics and Information, Kwangwoon University, Seoul, South Korea
| | - Jihoon Lee
- College of Electronics and Information, Kwangwoon University, Seoul, South Korea
- Institute of Nanoscale Science and Engineering, University of Arkansas, Fayetteville, AR, USA
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Abstract
Unlike monometallic materials, bimetallic plasmonic materials offer extensive benefits such as broadband tuning capability or high environmental stability. Here we report a broad range tuning of plasmon resonance of alloyed nanoislands by using solid-state dewetting of gold and silver bilayer thin films. Thermal dewetting after successive thermal evaporation of thin metal double-layer films readily forms AuAg-alloyed nanoislands with a precise composition ratio. The complete miscibility of alloyed nanoislands results in programmable tuning of plasmon resonance wavelength in a broadband visible range. Such extraordinary tuning capability opens up a new direction for plasmonic enhancement in biophotonic applications such as surface-enhanced Raman scattering or plasmon-enhanced fluorescence.
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Affiliation(s)
- Minhee Kang
- Smart Healthcare & Device Research Center, Samsung Medical Center , 81 Irwon-ro, Gangnam-gu, Seoul 06351, Republic of Korea
- Samsung Advanced Institute for Health Sciences & Technology (SAIHST), SungKyunKwan University , 81 Irwon-ro, Gangnam-gu, Seoul 06351, Republic of Korea
| | - Myeong-Su Ahn
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Youngseop Lee
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Ki-Hun Jeong
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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