Distance-determined sensitivity in attenuated total reflection-surface enhanced infrared absorption spectroscopy: aptamer–antigen compared to antibody–antigen

2014 ◽  
Vol 50 (58) ◽  
pp. 7787 ◽  
Author(s):  
Wen-Jing Bao ◽  
Zhen-Dong Yan ◽  
Min Wang ◽  
Yun Zhao ◽  
Jian Li ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Infrared Absorption Spectroscopy ◽  
Surface Enhanced

scholarly journals Study of surface-enhanced infrared absorption spectroscopy (SEIRAS) of black inkjet prints using silver colloid

2017 ◽  
Vol 10 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Michal Oravec ◽  
Katsuya Miura ◽  
Michal Čeppana
Keyword(s):  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Document Analysis ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Infrared Absorption Spectroscopy ◽  
Silver Colloid ◽  
Absorption Signal ◽  
Surface Enhanced ◽  
Scanning Electron

Abstract Only black inkjet prints were studied with regard to forensic examination of documents. We analysed twenty-one inkjet prints using surface-enhanced infrared absorption spectroscopy (SEIRAS). The present paper deals with micro-destructive document analysis based on silver nanoparticles (AgNPs) use to obtain surface enhanced ATR-FTIR (attenuated total reflection - Fourier transform infrared) spectra directly from the document. For this experiment, AgNPs in colloid form was applied. AgNPs for SEIRAS analyses were synthesised and afterwards analysed by scanning electron microscopy (SEM). The purpose of the enhancement of colloids was to improve the resolution of the absorption signal of the analysed samples from noise. In the experiment, the obtained ink ATR-FTIR spectra, with and without silver treatment, were significantly affected by the paper base.

Optimization of a Commercial Variable Angle Accessory for Entry Level Users of Electrochemical Attenuated Total Reflection Surface-Enhanced Infrared Absorption Spectroscopy (ATR-SEIRAS)

2019 ◽  
Vol 73 (12) ◽  
pp. 1394-1402 ◽  
Author(s):  
Jessica A. Sigrist ◽  
Erick S. Lins ◽  
Tyler A. Morhart ◽  
Jenni L. Briggs ◽  
Ian J. Burgess
Keyword(s):  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Specular Reflection ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
High Signal ◽  
Angle Of Incidence ◽  
Infrared Absorption Spectroscopy ◽  
Maximum Throughput ◽  
Surface Enhanced

An evaluation of several experimental aspects that can optimize electrochemical attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) performance using a commercially available, specular reflection accessory is provided. A comparison of different silicon single-bounce internal reflection elements (IREs) is made with emphasis on different face-angled crystal (FAC) options. Selection of optimal angle of incidence for maximizing signal and minimizing noise is shown to require consideration of the optical throughput of the accessory, reflection losses at the crystal surfaces, and polarization effects. The benefits of wire-grid polarizers and antireflective (AR) coatings on the IREs is discussed. High signal-to-noise ratios can be achieved by omitting polarizers, using an AR-coated FAC with a larger face angle, and working at angles of incidence close to the maximum throughput angle of the accessory.

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