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Precipitation and Co-precipitation01:17

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Related Experiment Video

Updated: Oct 15, 2025

Author Spotlight: Development and Application of SERS Flexible Substrates Using Synthesized AgNPs
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Highly Sensitive and Stable Copper-Based SERS Chips Prepared by a Chemical Reduction Method.

Pei Dai1, Haochen Li1, Xianzhi Huang1

  • 1School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

Nanomaterials (Basel, Switzerland)
|October 23, 2021
PubMed
Summary

Researchers developed cost-effective copper (Cu) Surface-Enhanced Raman Spectroscopy (SERS) chips with enhanced sensitivity and stability. Silver (Ag) modification further boosted performance, achieving a 7.6 × 10^6 enhancement factor and a 10^-11 M limit of detection for crystal violet.

Keywords:
SERS chipchemical reductioncopperhydrophobicitysurface-enhanced Raman scattering

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Copper (Cu) chips offer a cost-effective alternative to silver (Ag) and gold (Au) for Surface-Enhanced Raman Spectroscopy (SERS) applications.
  • However, Cu substrates typically exhibit limited SERS enhancement and poor stability.
  • Developing robust and sensitive Cu-based SERS platforms is crucial for practical applications.

Purpose of the Study:

  • To develop highly sensitive and stable Cu-based SERS chips using a chemical reduction method.
  • To investigate the effect of Ag modification on the SERS performance and stability of Cu chips.
  • To evaluate the potential of these chips for detecting organic molecules.

Main Methods:

  • Cu nanoparticles (NPs) were densely deposited onto fabric supports via a chemical reduction method.
  • Ag was introduced onto the Cu surface through a replacement reaction to create Cu-Ag hybrid chips.
  • The SERS performance, including enhancement factor and limit of detection, was evaluated using crystal violet (CV) as a probe molecule.

Main Results:

  • The as-prepared Cu-coated fabric exhibited a SERS enhancement factor of 2.0 × 10^6 and a limit of detection of 10^-8 M for CV.
  • Ag modification significantly enhanced the SERS performance, increasing the enhancement factor to 7.6 × 10^6 and lowering the LOD to 10^-11 M.
  • The Cu-Ag chips demonstrated improved long-term stability, retaining 80% of their original SERS intensity after two months, compared to bare Cu chips (18%).

Conclusions:

  • Cu-based SERS chips fabricated by chemical reduction offer good sensitivity and hydrophobicity.
  • Ag modification effectively enhances SERS performance and long-term stability of Cu chips through plasmonic coupling.
  • The developed Cu-Ag SERS chips show great promise for sensitive and quantitative detection of various organic compounds.