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Published on: July 22, 2013
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Dual-Hydrogen Bond Donor-Functionalized Carbon Nanotube Fibers: Enhancing Anion-Sensing Performance Through
Seung-Ho Choi1, Joon-Seok Lee1, Sungju Lee2,3
1Division of Materials of Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea.
Small (Weinheim an Der Bergstrasse, Germany)
|October 10, 2024
Summary
Carbon nanotube fiber sensors functionalized with squaramide selectors show improved acetate detection. Non-covalent functionalization significantly enhances sensor response for real-time anion monitoring.
Area of Science:
- Materials Science
- Analytical Chemistry
- Chemical Engineering
Background:
- Chemiresistive sensors offer sensitive detection of various analytes.
- Carbon nanotube fibers (CNTF) provide a robust platform for sensor development.
- Squaramide derivatives are effective hydrogen bond donors for anion recognition.
Purpose of the Study:
- To develop and compare chemiresistive anion sensors using CNTFs functionalized with squaramide-based selectors.
- To investigate the effect of covalent versus non-covalent functionalization on sensor performance.
- To demonstrate real-time, on-site anion detection using a smartphone-integrated sensor module.
Main Methods:
- Synthesis of squaramide-based dual-hydrogen bond donor selectors (SQ1, SQ2).
- Functionalization of CNTFs using covalent and non-covalent methods.
- Anion-binding studies via UV-vis titrations.
- Fabrication and testing of chemiresistive sensors for acetate detection.
- Integration of sensors into a wireless communication module for smartphone data transfer.
Main Results:
- Acetate (AcO-) induced deprotonation of both SQ1 and SQ2 selectors.
- Non-covalently functionalized CNTFs exhibited a 3.6-fold higher sensor response to acetate compared to covalently functionalized CNTFs.
- Expanded selector library with TU- and CA-based compounds demonstrated selective acetate sensing.
- Successful demonstration of on-site, real-time anion detection via a smartphone interface.
Conclusions:
- Non-covalent functionalization is a superior strategy for enhancing CNTF-based anion sensor performance.
- Squaramide-functionalized CNTFs offer a promising platform for selective and sensitive acetate detection.
- The developed sensor system enables portable, real-time anion monitoring for practical applications.
