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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Recent Developments in Surface-Enhanced Raman Spectroscopy and Its Application in Food Analysis: Alcoholic Beverages as an Example
TL;DR: Surface-enhanced Raman spectroscopy (SERS) as mentioned in this paper is an emerging technology that combines Raman Spectroscopy and nanotechnology with great potential to accurately characterize molecular adsorption behavior and molecular structure.
Journal ArticleDOI
Sensitive Flexible Biosensor Based on the Three-Dimensional Layered AgNFs@Graphene Nanohybrids
Ke Lv,Qin Wei,Qin Wei,Tiying Zhu,Xinru Zhao,Zhaoqing Li,Yuanyuan Xu,Shuo Chen,Zhen Li,Xiangyu Fan,Weixi Lu,Mingrui Shao,Baoyuan Man,Hua-Min Li,Cheng Yang +14 more
TL;DR: In this paper, a three-dimensional layered silver nanoflowers/graphene (AgNFs/Graphene) nanohybrids were firstly proposed and fabricated for the sensitive flexible biosensors.
Journal ArticleDOI
A disposable gold-cellulose nanofibril platform for SERS mapping.
Saliha Nur Tanis,Hasan Ilhan,Burcu Guven,Emine Kubra Tayyarcan,Hakan Çiftçi,Necdet Sağlam,Ismail Hakki Boyaci,Ugur Tamer +7 more
TL;DR: A disposable and inexpensive paper-like gold nanoparticle-embedded cellulose nanofibril substrate is presented for the rapid enumeration of Escherichia coli using surface-enhanced Raman scattering (SERS) mapping and the developed method was evaluated for detecting E. coli in artificially contaminated samples.
Journal ArticleDOI
Plasmonic Rare-Earth Nanosheets as Surface Enhanced Raman Scattering Substrates with High Sensitivity and Stability for Multicomponent Analysis.
Jingbin Li,Wencai Yi,Meng Yin,Haifeng Yang,Junfang Li,Yahui Li,Zhi-Wei Jiao,Huahua Bai,Mingqiang Zou,Guangcheng Xi +9 more
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Advances in surface-enhanced Raman scattering bioprobes for cancer imaging
TL;DR: An overview of SERS bioprobes based on noble metals, metal oxides, and composite materials is presented by highlighting their respective, unique advantages and recent achievements in cancer imaging realm.
References
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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
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