Journal ArticleDOI
Nanostructured organic semiconductor films for molecular detection with surface-enhanced Raman spectroscopy
Mehmet Yilmaz,Mehmet Yilmaz,Esra Babur,Mehmet Özdemir,Rebecca L. Gieseking,Yavuz Dede,Ugur Tamer,George C. Schatz,Antonio Facchetti,Hakan Usta,Gokhan Demirel +10 more
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TLDR
It is demonstrated 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 and the fundamental roles of the π-conjugated core fluorocarbon substitution and the unique DFH- 4T film morphology governing the SERS response are demonstrated.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.read more
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Silver nanostructure-decorated hierarchical titanium dioxide nanoflowers for SERS and photocatalytic applications
TL;DR: In this article , a polymeric conformal thin film of 3,4-dihydroxyphenyl-L-alanine (PLDOPA) was used for the synthesis of silver nanoparticle decorated TiO2 nanoflowers (TNFs).
Journal ArticleDOI
Recent development of surface-enhanced Raman scattering for biosensing
Chenglong Lin,Yanyan Li,Yusi Peng,Shuaichang Zhao,Meimei Xu,Lingxia Zhang,Zhengren Huang,Jianlin Shi,Yong-Huang Yang +8 more
TL;DR: In this paper , the challenges and perspectives of SERS biosensing in the future are presented, and the important strategies (extending from nanomaterials with tunable shapes and nanostructures to surface bio-functionalization by modifying affinity groups or specific biomolecules) for improving SERS sensing performance are comprehensively discussed.
Journal ArticleDOI
Bi5O7Br-nanotube@Au-nanoparticle core-shell assembly for high signal-to-noise ratio SERS detection of adenine
TL;DR: In this paper , a core-shell assembly of Au nanoparticle wrapped with Au doped Bi5O7Br nanotube with eliminated fluorescent background and notable chemical enhancement effect was exploited and served as a surface enhanced Raman scattering (SERS) sensor for detection of adenine.
Journal ArticleDOI
Novel insight into charge transfer regulation based on carrier density-dependent Ag/ITO composite films.
Yang Jin,Eungyeong Park,Cheng Min Tang,Qi Chu,Sila Jin,Shuang-Tao Guo,Li Chen,Young Mee Jung +7 more
TL;DR: In this article , the authors explored the possible mechanism of charge transfer (CT) by varying the bandgap and explained the causes of the surfaceenhanced Raman scattering (SERS), and found that a synchronous change in the CT process with the carrier density was discovered.
References
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Journal ArticleDOI
Gaussian basis sets for use in correlated molecular calculations. I. The atoms boron through neon and hydrogen
TL;DR: In this paper, a detailed study of correlation effects in the oxygen atom was conducted, and it was shown that primitive basis sets of primitive Gaussian functions effectively and efficiently describe correlation effects.
Journal ArticleDOI
Long-range corrected hybrid density functionals with damped atom–atom dispersion corrections
Jeng-Da Chai,Martin Head-Gordon +1 more
TL;DR: The re-optimization of a recently proposed long-range corrected hybrid density functional, omegaB97X-D, to include empirical atom-atom dispersion corrections yields satisfactory accuracy for thermochemistry, kinetics, and non-covalent interactions.
Journal Article
Long-Range Corrected Hybrid Density Functionals with Damped Atom-Atom Dispersion Corrections
TL;DR: Chai and Head-Gordon as discussed by the authors proposed a long-range corrected (LC) hybrid density functional with Damped Atom-Atom Dispersion corrections, which is called ωB97X-D.
Journal ArticleDOI
Systematic optimization of long-range corrected hybrid density functionals.
Jeng-Da Chai,Martin Head-Gordon +1 more
TL;DR: The qualitative failures of the commonly used hybrid density functionals in some "difficult problems," such as dissociation of symmetric radical cations and long-range charge-transfer excitations, are significantly reduced by the present LC hybriddensity functionals.
Journal ArticleDOI
MOPAC: A semiempirical molecular orbital program
TL;DR: This work focuses on the calculations of vibrational spectra, thermodynamic quantities, isotopic substitution effects, and force constants in a fully integrated program for the study of chemical reactions involving molecules, ions, and linear polymers using MOPAC.
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