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Related Concept Videos

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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Related Experiment Video

Updated: Jan 6, 2026

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Antenna array-enhanced attenuated total reflection IR analysis in an aqueous solution.

Jian Li1, Zhendong Yan2, Jin Li1

  • 1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China. xhxia@nju.edu.cn.

Nanoscale
|October 10, 2019
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Summary

This study introduces a novel gold antenna array platform for attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS). The new system significantly enhances sensitivity for detecting trace analytes in aqueous solutions.

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Area of Science:

  • Spectroscopy
  • Nanotechnology
  • Surface Science

Background:

  • Attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) is crucial for studying dynamic reactions in aqueous solutions.
  • A key limitation of ATR-SEIRAS is its sensitivity in detecting trace analytes against the strong water background.
  • Real-time, in situ analysis of low-concentration species in aqueous environments remains challenging.

Purpose of the Study:

  • To develop a novel ATR-SEIRAS platform with enhanced sensitivity for trace analyte detection in aqueous solutions.
  • To integrate a large-scale gold antenna array onto a conventional ATR-IR platform.
  • To overcome the sensitivity limitations of existing ATR-SEIRAS techniques.

Main Methods:

  • Fabrication of a well-ordered, square centimeter-scale triangle gold antenna array on an Si prism using nanosphere lithography.
  • Integration of the gold antenna array onto a conventional ATR-IR platform.
  • Utilizing the antenna array's resonance properties for enhanced infrared detection.

Main Results:

  • The novel platform demonstrated a signal enhancement factor greater than 300 for trace protein adsorption.
  • The antenna array's resonance showed weak dependence on incident polarization and orientation, simplifying detection.
  • The high refractive index of the Si prism minimized antenna resonance shifts caused by analyte adsorption.

Conclusions:

  • The developed antenna array-enhanced ATR-SEIRAS platform significantly boosts sensitivity for detecting trace analytes in aqueous solutions.
  • This technology enables real-time, in situ monitoring of interfacial processes in aqueous environments using commercial IR instruments.
  • The platform holds great promise for various interfacial applications requiring enhanced signal detection.