Related Experiment Video
Updated: Apr 7, 2026
09:34
Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment
Published on: July 12, 2016
10.1K
Microfluidic Crystal Engineering of π-Conjugated Polymers
Gang Wang1, Nils Persson, Ping-Hsun Chu
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University , Shanghai 201620, People's Republic of China.
ACS Nano
|July 17, 2015
Summary
Microfluidic flow processing of conjugated polymers yields highly ordered fibers with significantly improved charge transport. This method enhances semiconducting polymer crystal engineering for high-performance electronic devices.
Area of Science:
- Materials Science
- Polymer Chemistry
- Organic Electronics
Background:
- Oriented crystallization of conjugated polymers in solution is rarely reported.
- Solution-processed conjugated polymers often exhibit suboptimal charge transport due to disordered structures.
Purpose of the Study:
- To develop a method for oriented crystallization of conjugated polymers directly in solution.
- To investigate the impact of microfluidic flow on polymer structure and charge transport properties.
Main Methods:
- Utilized a microfluidic system with controlled flow rates, sequential cooling, and low-dose UV irradiation.
- Processed poly(3-hexylthiophene) (P3HT) and an electron transport polymer.
- Analyzed thin-film structure and charge mobility using techniques like exciton bandwidth and π-π stacking distance measurements.
Main Results:
- Achieved tightly π-stacked polymer fibers with significantly improved hole mobility (0.013 to 0.16 cm² V⁻¹ s⁻¹ for P3HT).
- Reduced π-π stacking distance from 3.93 to 3.72 Å and exciton bandwidth from 140 to 25 meV.
- Identified an optimal intermediate flow rate (0.25 m s⁻¹) for enhanced properties.
- Demonstrated the general applicability of the microfluidic method to different polymers and solvents.
Conclusions:
- Microfluidic flow processing enables precise control over conjugated polymer crystallization in solution.
- The "tie chain" mechanism is proposed to facilitate charge transport between nanoaggregated structures.
- This technique offers a general strategy for fabricating high-performance semiconducting polymer devices.
