High-performance gas-phase chiral enantiomer detectors based on chiral-induced spin selectivity effect

Area of Science:

• Analytical Chemistry
• Materials Science
• Organic Chemistry

Background:

• Chirality-induced spin selectivity (CISS) effect enhances chiral detectability.
• Accurate and portable detection of gas-phase chiral enantiomers remains a challenge in analytical chemistry.

Purpose of the Study:

• To develop high-performance, portable gas-phase chiral detectors based on the CISS effect using organic polymers.
• To address limitations in current chiral enantiomer detection methods.

Main Methods:

• Synthesis of block copolymers poly(3-hexylthiophene)-block poly(phenyl isocyanate) (P3HT-PPI).
• Tuning the CISS effect by varying the PPI ratio in P3HT-PPI for precise chiral recognition.
• Fabrication of gas enantiomer detectors using P3HT₈₀-PPI₃₀.

Main Results:

• P3HT₈₀-PPI₃₀ achieved high spin polarization (up to 70.8%).
• The detector showed excellent chiral distinguishability for limonene enantiomers (current asymmetry factor up to 0.50).
• Demonstrated real-time detection, high reversibility, and linear concentration dependence.

Conclusions:

• The developed P3HT-PPI based detectors provide a precise and portable solution for chiral enantiomer recognition.
• An 'electronic dichroism' system was created for real-time visualization of enantiomeric excess.
• This approach offers a new strategy for next-generation real-time, efficient detection of multiple chiral enantiomers.