Surface-Enhanced Raman Spectroscopy Using Photodeposited Gold Particles in Porous Sol-Gel Silicates

1995 ◽  
Vol 99 (12) ◽  
pp. 3892-3894 ◽  
Author(s):  
Fatemeh Akbarian ◽  
Bruce S. Dunn ◽  
Jeffrey I. Zink
Keyword(s):  
Raman Spectroscopy ◽  
Sol Gel ◽  
Surface Enhanced Raman Spectroscopy ◽  
Gold Particles ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Surface-Enhanced Raman Spectra of VX and its Hydrolysis Products

2005 ◽  
Vol 59 (5) ◽  
pp. 654-660 ◽  
Author(s):  
Stuart Farquharson ◽  
Alan Gift ◽  
Paul Maksymiuk ◽  
Frank Inscore
Keyword(s):  
Raman Spectroscopy ◽  
Vibrational Mode ◽  
Sol Gel ◽  
Surface Enhanced Raman Spectroscopy ◽  
Nerve Agent ◽  
Methylphosphonic Acid ◽  
Hydrolysis Products ◽  
Chemical Agents ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Detection of chemical agents as poisons in water supplies not only requires μg/L sensitivity, but also requires the ability to distinguish their hydrolysis products. We have been investigating the ability of surface-enhanced Raman spectroscopy (SERS) to detect chemical agents at these concentrations. Here we expand these studies and present the SERS spectra of the nerve agent VX (ethyl S-2-diisopropylamino ethyl methylphosphonothioate) and its hydrolysis products, ethyl S-2-diisopropylamino methylphosphonothioate, 2-(diisopropylamino) ethanethiol, ethyl methylphosphonic acid, and methylphosphonic acid. Vibrational mode assignments for the observed SERS peaks are also provided. Overall, each of these chemicals produces a series of peaks between 450 and 900 cm−1 that are sufficiently unique to allow identification. SERS measurements were performed in silver-doped sol-gel-filled capillaries that are being developed as part of an extractive point sensor.

scholarly journals Sol–Gel Ceramics for SEIRAS and SERS Substrates

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 439
Author(s):  
Jesús Alberto Garibay’Alvarado ◽  
Simón Yobanny Reyes-López
Keyword(s):  
Raman Spectroscopy ◽  
Sol Gel ◽  
Surface Enhanced Raman Spectroscopy ◽  
Infrared Absorption Spectroscopy ◽  
Electrospinning Technique ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Surface Enhanced Infrared Absorption Spectroscopy and Surface Enhanced Raman Spectroscopy are analytic techniques that have not been massively adopted since there are issues that still need to be solved with regard to the nature of the signal enhancement substrates used. The sol–gel method for the obtention of ceramics provides an alternative for the production of said substrates. Ceramics are very wear- and heat-resistant, properties that can be used for their regeneration, and through the sol–gel method, ceramics can be produced with high purity as well as can be fashioned in many ways through different techniques, which can be helpful in the pursuit of reproducibility. This paper discusses the different advantages of sol–gel ceramics, their use in the electrospinning technique, and their application in infrared and Raman surface-enhanced spectroscopy.

Sol-gel chemical sensors for surface-enhanced Raman spectroscopy

1999 ◽  
Author(s):  
Vincent Y. Lee ◽  
Stuart Farquharson ◽  
Hueong-Chan Kwon ◽  
Mahmoud R. Shahriari ◽  
Petrie M. Rainey
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Sensors ◽  
Sol Gel ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Bacterial detection and differentiation via direct volatile organic compound sensing with surface enhanced Raman spectroscopy

2017 ◽  
Author(s):  
Caitlin S. DeJong ◽  
David I. Wang ◽  
Aleksandr Polyakov ◽  
Anita Rogacs ◽  
Steven J. Simske ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Bacterial Infections ◽  
Direct Detection ◽  
Point Of Care ◽  
Surface Enhanced Raman Spectroscopy ◽  
E Coli ◽  
Recent Emergence ◽  
Surface Enhanced ◽  
Volatile Organic ◽  
Surface Enhanced Raman

Through the direct detection of bacterial volatile organic compounds (VOCs), via surface enhanced Raman spectroscopy (SERS), we report here a reconfigurable assay for the identification and monitoring of bacteria. We demonstrate differentiation between highly clinically relevant organisms: <i>Escherichia coli</i>, <i>Enterobacter cloacae</i>, and <i>Serratia marcescens</i>. This is the first differentiation of bacteria via SERS of bacterial VOC signatures. The assay also detected as few as 10 CFU/ml of <i>E. coli</i> in under 12 hrs, and detected <i>E. coli</i> from whole human blood and human urine in 16 hrs at clinically relevant concentrations of 10<sup>3</sup> CFU/ml and 10<sup>4</sup> CFU/ml, respectively. In addition, the recent emergence of portable Raman spectrometers uniquely allows SERS to bring VOC detection to point-of-care settings for diagnosing bacterial infections.

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