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Yilmaz M, Babur E, Ozdemir M, Gieseking RL, Dede Y, Tamer U, Schatz GC, Facchetti A, Usta H, Demirel G. Nanostructured organic semiconductor films for molecular detection with surface-enhanced Raman spectroscopy. Nat Mater 2017; 16:918-924. [PMID: 28783157 DOI: 10.1038/nmat4957] [Citation(s) in RCA: 128] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 07/04/2017] [Indexed: 05/18/2023]
Abstract
π-Conjugated organic semiconductors have been explored in several optoelectronic devices, yet their use in molecular detection as surface-enhanced Raman spectroscopy (SERS)-active platforms is unknown. Herein, we demonstrate that SERS-active, superhydrophobic and ivy-like nanostructured films of a molecular semiconductor, α,ω-diperfluorohexylquaterthiophene (DFH-4T), can be easily fabricated by vapour deposition. DFH-4T films without any additional plasmonic layer exhibit unprecedented Raman signal enhancements up to 3.4 × 103 for the probe molecule methylene blue. The combination of quantum mechanical computations, comparative experiments with a fluorocarbon-free α,ω-dihexylquaterthiophene (DH-4T), and thin-film microstructural analysis demonstrates the fundamental roles of the π-conjugated core fluorocarbon substitution and the unique DFH-4T film morphology governing the SERS response. Furthermore, Raman signal enhancements up to ∼1010 and sub-zeptomole (<10-21 mole) analyte detection were accomplished by coating the DFH-4T films with a thin gold layer. Our results offer important guidance for the molecular design of SERS-active organic semiconductors and easily fabricable SERS platforms for ultrasensitive trace analysis.
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Affiliation(s)
- Mehmet Yilmaz
- Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara, Turkey
- Department of Bioengineering, Faculty of Engineering and Architecture, Sinop University, 57000 Sinop, Turkey
| | - Esra Babur
- Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara, Turkey
| | - Mehmet Ozdemir
- Department of Materials Science and Nanotechnology Engineering, Abdullah Gül University, 38080 Kayseri, Turkey
| | - Rebecca L Gieseking
- Department of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
| | - Yavuz Dede
- Theoretical/Computational Chemistry Research Laboratory, Department of Chemistry, Gazi University, 06500 Ankara, Turkey
| | - Ugur Tamer
- Department of Analytical Chemistry, Faculty of Pharmacy, Gazi University, 06330 Ankara, Turkey
| | - George C Schatz
- Department of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
| | - Antonio Facchetti
- Department of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
- Flexterra Inc., 8025 Lamon Avenue, Skokie, 60077 Illinois, USA
| | - Hakan Usta
- Department of Materials Science and Nanotechnology Engineering, Abdullah Gül University, 38080 Kayseri, Turkey
| | - Gokhan Demirel
- Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara, Turkey
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Bakirci G, Yilmaz M, Babur E, Ozden D, Demirel G. Understanding the effect of polydopamine coating on catalytic reduction reactions. CATAL COMMUN 2017. [DOI: 10.1016/j.catcom.2016.12.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Erdogan H, Yilmaz M, Babur E, Duman M, Aydin HM, Demirel G. Fabrication of Plasmonic Nanorod-Embedded Dipeptide Microspheres via the Freeze-Quenching Method for Near-Infrared Laser-Triggered Drug-Delivery Applications. Biomacromolecules 2016; 17:1788-94. [PMID: 27064415 DOI: 10.1021/acs.biomac.6b00214] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Control of drug release by an external stimulus may provide remote controllability, low toxicity, and reduced side effects. In this context, varying physical external stimuli, including magnetic and electric fields, ultrasound, light, and pharmacological stimuli, have been employed to control the release rate of drug molecules in a diseased region. However, the design and development of alternative on-demand drug-delivery systems that permit control of the dosage of drug released via an external stimulus are still required. Here, we developed near-infrared laser-activatable microspheres based on Fmoc-diphenylalanine (Phe-Phe) dipeptides and plasmonic gold nanorods (AuNRs) via a simple freeze-quenching approach. These plasmonic nanoparticle-embedded microspheres were then employed as a smart drug-delivery platform for native, continuous, and pulsatile doxorubicin (DOX) release. Remarkable sustained, burst, and on-demand DOX release from the fabricated microspheres were achieved by manipulating the laser exposure time. Our results demonstrate that AuNR-embedded dipeptide microspheres have great potential for controlled drug-delivery systems.
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Affiliation(s)
- Hakan Erdogan
- Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University , 06500 Ankara, Turkey
| | - Mehmet Yilmaz
- Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University , 06500 Ankara, Turkey.,Department of Bioengineering, Faculty of Engineering and Architecture, Sinop University , 57000 Sinop, Turkey
| | - Esra Babur
- Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University , 06500 Ankara, Turkey
| | - Memed Duman
- Department of Nanotechnology and Nanomedicine, Institute for Graduate Studies in Science and Engineering, Hacettepe University , 06800 Ankara, Turkey
| | - Halil M Aydin
- Environmental Engineering Department & Bioengineering Division, Faculty of Engineering, Hacettepe University , 06800 Ankara, Turkey
| | - Gokhan Demirel
- Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University , 06500 Ankara, Turkey
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Erdogan H, Babur E, Yilmaz M, Candas E, Gordesel M, Dede Y, Oren EE, Demirel GB, Ozturk MK, Yavuz MS, Demirel G. Morphological Versatility in the Self-Assembly of Val-Ala and Ala-Val Dipeptides. Langmuir 2015; 31:7337-7345. [PMID: 26086903 DOI: 10.1021/acs.langmuir.5b01406] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Since the discovery of dipeptide self-assembly, diphenylalanine (Phe-Phe)-based dipeptides have been widely investigated in a variety of fields. Although various supramolecular Phe-Phe-based structures including tubes, vesicles, fibrils, sheets, necklaces, flakes, ribbons, and wires have been demonstrated by manipulating the external physical or chemical conditions applied, studies of the morphological diversity of dipeptides other than Phe-Phe are still required to understand both how these small molecules respond to external conditions such as the type of solvent and how the peptide sequence affects self-assembly and the corresponding molecular structures. In this work, we investigated the self-assembly of valine-alanine (Val-Ala) and alanine-valine (Ala-Val) dipeptides by varying the solvent medium. It was observed that Val-Ala dipeptide molecules may generate unique self-assembly-based morphologies in response to the solvent medium used. Interestingly, when Ala-Val dipeptides were utilized as a peptide source instead of Val-Ala, we observed distinct differences in the final dipeptide structures. We believe that such manipulation may not only provide us with a better understanding of the fundamentals of the dipeptide self-assembly process but also may enable us to generate novel peptide-based materials for various applications.
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Affiliation(s)
- Hakan Erdogan
- †Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara, Turkey
| | - Esra Babur
- †Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara, Turkey
| | - Mehmet Yilmaz
- †Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara, Turkey
| | - Elif Candas
- ‡Bionanodesign Laboratory, Department of Biomedical Engineering, TOBB University of Economics and Technology, 06560 Ankara, Turkey
| | - Merve Gordesel
- §Theoretical/Computational Chemistry Research Laboratory, Department of Chemistry, Gazi University, 06900 Ankara, Turkey
| | - Yavuz Dede
- §Theoretical/Computational Chemistry Research Laboratory, Department of Chemistry, Gazi University, 06900 Ankara, Turkey
| | - Ersin Emre Oren
- ‡Bionanodesign Laboratory, Department of Biomedical Engineering, TOBB University of Economics and Technology, 06560 Ankara, Turkey
| | | | | | - Mustafa Selman Yavuz
- #Department of Metallurgy and Materials Engineering, Selcuk University, 42075 Konya, Turkey
| | - Gokhan Demirel
- †Bio-inspired Materials Research Laboratory (BIMREL), Department of Chemistry, Gazi University, 06500 Ankara, Turkey
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Akin MS, Yilmaz M, Babur E, Ozdemir B, Erdogan H, Tamer U, Demirel G. Large area uniform deposition of silver nanoparticles through bio-inspired polydopamine coating on silicon nanowire arrays for practical SERS applications. J Mater Chem B 2014; 2:4894-4900. [DOI: 10.1039/c4tb00616j] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bio-inspired polydopamine coating has been demonstrated to control the size and density of silver nanoparticles on 3-D SiNW arrays for practical SERS applications.
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Affiliation(s)
- Merve Selen Akin
- Bio-Inspired Materials Research Laboratory (BIMREL)
- Department of Chemistry
- Gazi University
- 06500 Ankara, Turkey
| | - Mehmet Yilmaz
- Bio-Inspired Materials Research Laboratory (BIMREL)
- Department of Chemistry
- Gazi University
- 06500 Ankara, Turkey
| | - Esra Babur
- Bio-Inspired Materials Research Laboratory (BIMREL)
- Department of Chemistry
- Gazi University
- 06500 Ankara, Turkey
| | - Betul Ozdemir
- Bio-Inspired Materials Research Laboratory (BIMREL)
- Department of Chemistry
- Gazi University
- 06500 Ankara, Turkey
| | - Hakan Erdogan
- Bio-Inspired Materials Research Laboratory (BIMREL)
- Department of Chemistry
- Gazi University
- 06500 Ankara, Turkey
| | - Ugur Tamer
- Department of Analytical Chemistry
- Faculty of Pharmacy
- Gazi University
- 06330 Ankara, Turkey
| | - Gokhan Demirel
- Bio-Inspired Materials Research Laboratory (BIMREL)
- Department of Chemistry
- Gazi University
- 06500 Ankara, Turkey
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Demirel G, Babur E. Vapor-phase deposition of polymers as a simple and versatile technique to generate paper-based microfluidic platforms for bioassay applications. Analyst 2014; 139:2326-31. [DOI: 10.1039/c4an00022f] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple yet versatile approach has been demonstrated for the fabrication of paper-based microfluidic platforms based on a vapor-phase polymerization technique.
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Affiliation(s)
- Gokhan Demirel
- Bio-inspired Materials Research Laboratory (BIMREL)
- Department of Chemistry
- Gazi University
- 06500 Ankara, Turkey
| | - Esra Babur
- Bio-inspired Materials Research Laboratory (BIMREL)
- Department of Chemistry
- Gazi University
- 06500 Ankara, Turkey
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Rothweiler M, Babur E, Kroffke S. Spezifische Sprachentwicklungsstörung im Kontext kindlicher Mehrsprachigkeit - Ergebnisse zur Kasusmorphologie in der Erstsprache Türkisch. Sprache Stimme Gehör 2007. [DOI: 10.1055/s-2007-985838] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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