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Updated: Dec 9, 2025

A Polyaniline-based Sensor of Nucleic Acids
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Silver-Based SERS Pico-Molar Adenine Sensor.

Yonhua Tzeng1, Bo-Yi Lin1

  • 1Department of Electrical Engineering, National Cheng Kung University, Tainan 701401, Taiwan.

Biosensors
|September 16, 2020
PubMed
Summary

This study presents a novel sensor for detecting adenine, a key molecule in research. The sensor achieves highly sensitive and reproducible detection of adenine down to picomolar levels, even in varying pH conditions.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Adenine is crucial for biomedical and agricultural research.
  • Sensitive detection of low adenine concentrations is desirable.
  • Surface-enhanced Raman scattering (SERS) offers label-free molecular fingerprinting.

Purpose of the Study:

  • To develop a novel SERS sensor for sensitive adenine detection.
  • To investigate the sensor's performance regarding concentration and pH.
  • To establish adenine detection at picomolar levels.

Main Methods:

  • Fabrication of a SERS sensor using silver nanostructures on copper bumps within etched silicon.
  • Utilizing reflected laser illumination for enhanced excitation.
  • Analyzing SERS spectra for concentration-dependent peak shifts and pH effects.
Keywords:
Raman scatteringSERSadeninecopperpHplasmonsilver

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Main Results:

  • The novel SERS sensor demonstrated a reproducible detection limit of 10-11 M adenine.
  • A concentration-dependent shift of the adenine ring-breathing mode peak towards 760 cm-1 was observed.
  • Reproducible detection of 10-12 M adenine in pH 9 solution was achieved.

Conclusions:

  • The novel SERS sensor enables highly sensitive and reproducible adenine detection.
  • The sensor's performance is influenced by concentration and pH.
  • This pico-molar adenine sensor is suitable for applications with varying pH values.