Discrimination between hydrogen bonding and protonation in the spectra of a surface-enhanced Raman sensor

2018 ◽  
Vol 20 (2) ◽  
pp. 866-871 ◽  
Author(s):  
Nungnit Wattanavichean ◽  
Ella Casey ◽  
Richard J. Nichols ◽  
Heike Arnolds
Keyword(s):  
Hydrogen Bonding ◽  
Breathing Mode ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Protonated Species ◽  
Raman Sensor ◽  
Ring Breathing Mode

Adsorbed mercaptopyridine can sense hydrogen-bonding because the ring breathing mode has a different frequency from bare and protonated species.

Surface enhanced Raman scattering of single 1,4-Benzenedithiol molecular junction

2016 ◽  
Vol 30 (13) ◽  
pp. 1642010 ◽  
Author(s):  
S. Kaneko ◽  
D. Murai ◽  
Sh. Fujii ◽  
M. Kiguchi
Keyword(s):  
Raman Scattering ◽  
Time Evolution ◽  
Surface Enhanced Raman Scattering ◽  
Molecular Junction ◽  
Breathing Mode ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Electronic Conductance ◽  
Enhanced Raman Scattering ◽  
Ring Breathing Mode

Here, we present simultaneous electronic and optical measurements of a single 1,4-benzenedithiol (BDT) molecular junctions to investigate the electronic and structural details in the molecular junction and to understand the charge transport property at the single molecular scale. The electronic property was investigated by DC conductance measurement while structural property was characterized using surface enhanced Raman scattering (SERS) measurement. The single BDT junctions sandwiched between Au nanogap-electrodes were prepared by the mechanically controllable break junction method at ambient conditions. The simultaneous conductance and SERS measurements demonstrate that ring deformation mode coupled to C–S stretching mode, ring breathing mode, and C=C stretching mode are detectable for the single BDT molecular junctions with electronic conductance of [Formula: see text] [Formula: see text]. The single molecule origin is supported by the characteristic variability of SERS within samples. Time evolution of the conductance and SERS signals indicated that the molecular conductance and the vibrational energy of the ring breathing mode exhibits anti-correlated relationship. This relationship can be mediated by time evolution of structural change in the single molecular junction and corresponding change in strength of metal–molecular coupling. The larger metal–molecular coupling causes higher electronic conductance of the molecular junction while charge transfer effect leads to weakening of molecular bonds and thus a resulting decrease in the vibration energy of the ring breathing mode.

scholarly journals Hybrid Sol-Gel Surface-Enhanced Raman Sensor for Xylene Detection in Solution

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7912
Author(s):  
Verena Weber ◽  
Laura Brigo ◽  
Giovanna Brusatin ◽  
Giovanni Mattei ◽  
Danilo Pedron ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Sol Gel ◽  
Metallic Surfaces ◽  
Aromatic Molecules ◽  
Surface Enhanced ◽  
Gel Film ◽  
Volatile Organic ◽  
Surface Enhanced Raman ◽  
Raman Sensor

This paper reports on the fabrication and characterization of a plasmonic/sol-gel sensor for the detection of aromatic molecules. The sol-gel film was engineered using polysilsesquioxanes groups to capture the analyte, through π-π interaction, and to concentrate it close to the plasmonic surface, where Raman amplification occurs. Xylene was chosen as an analyte to test the sensor. It belongs to the general class of volatile organic compounds and can be found in water or in the atmosphere as pollutants released from a variety of processes; its detection with SERS is typically challenging, due to its low affinity toward metallic surfaces. The identification of xylene was verified in comparison with that of other aromatic molecules, such as benzene and toluene. Investigations were carried out on solutions of xylene in cyclohexane, using concentrations in the range from 0 to 800 mM, to evaluate the limit of detection (LOD) of about 40 mM.

Effects of hydrogen bonding on the ring breathing mode of pyridine in pyridine/chloroform and pyridine/bromoform systems

2009 ◽  
Vol 479 (1-3) ◽  
pp. 43-46 ◽  
Author(s):  
Haiyan Fan ◽  
C. Diane Moliva A. ◽  
Jeffrey K. Eliason ◽  
Jason L. Olson ◽  
Daniel D. Green ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Breathing Mode ◽  
Ring Breathing Mode

scholarly journals Charge Transfer on the Surface-Enhanced Raman Scattering of Ag/4-MBA/PEDOT:PSS Syste: Intermolecular Hydrogen Bonding

Chemosensors ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 111
Author(s):  
Yuenan Pan ◽  
Wei Wang ◽  
Shuang Guo ◽  
Sila Jin ◽  
Eungyeong Park ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Charge Transfer ◽  
Hydrogen Bonds ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Sers Substrate ◽  
Intermolecular Hydrogen Bonding ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A sandwich-structured noble metal-probe molecule-organic semiconductor consisting of Ag nanoparticles (NPs), 4-mercaptobenzoic acid (4-MBA) and different concentrations of poly(styrenesulfonate:poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) was prepared by layer-by-layer assembly. Intermolecular hydrogen bonding was observed to have a significant effect on the surface-enhanced Raman scattering (SERS) of Ag/4-MBA/PEDOT:PSS. Upon increasing the PEDOT:PSS concentration, the characteristic Raman band intensity of 4-MBA was enhanced. In addition, the selected b2 vibration mode was significantly enhanced due to the influence of the charge transfer (CT) mechanism. The CT degree (ρCT) of the composite system was calculated before and after doping with PEDOT:PSS; when the concentration of PEDOT:PSS was 0.8%, the SERS intensity tended to be stable, and ρCT reached a maximum. Compared with that of the undoped PEDOT:PSS system, ρCT was significantly enhanced after doping, which can be explained by the CT effect induced by hydrogen bonds. These results indicate that hydrogen bonding transfers a charge from the Fermi energy level of Ag to the lowest unoccupied molecular orbital (LUMO) of 4-MBA, and due to the resulting potential difference, the charge will continue to transfer to the LUMO of PEDOT:PSS. Therefore, the introduction of organic semiconductors into the field of SERS not only expands the SERS substrate scope, but also provides a new idea for exploring the SERS mechanism. In addition, the introduction of hydrogen bonds has become an important guide for the study of CT and the structure of composite systems.

Surface-enhanced Raman sensor for nitroexplosive vapors

1998 ◽  
Author(s):  
John W. Haas III ◽  
James M. Sylvia ◽  
Kevin M. Spencer ◽  
Thomas M. Johnston ◽  
Susan L. Clauson
Keyword(s):  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Raman Sensor

Cooperative hydrogen-bonding of the adenine–thymine pair as a strategy for lowering the limit of detection of thymine by surface-enhanced Raman spectroscopy

The Analyst ◽  
2016 ◽  
Vol 141 (11) ◽  
pp. 3428-3436 ◽  
Author(s):  
Mónica B. Mamián-López ◽  
Paola Corio ◽  
Marcia L. A. Temperini
Keyword(s):  
Raman Spectroscopy ◽  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Limit Of Detection ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Thymine Adenine ◽  
Cooperative Hydrogen Bonding ◽  
Adenine Thymine

The formation of cooperative hydrogen bonds between the thymine–adenine pair was used to indirectly determine thymine by SERS, improving the limit of detection values up to two orders of magnitude.

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