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pH-Responsive DNA Nanolinker Conjugated Hybrid Materials for Electrochemical Microactuator and Biosensor Applications

Carbon nanotube (CNT)-based composite or hybrid materials have been broadly used for various biomedical applications such as microactuators, sensors, capacitors, and flexible electronic textiles because of their appealing physical and electrical properties and energy-storage functions. However, to enable application-based specific functionalities (e.g., sensing, responding, and deformation) it is essential that smart stimulus-responsive elements be incorporated into the CNT-based materials. A pioneering approach in integrating stimulus-responsive molecules or linkers is to utilize multistranded DNA structures, such as i-motif DNA with a four-folded structure, which shows reversible conformational changes upon pH alteration. Herein, a pH-responsive CNT-based hybrid material is developed by conjugating i-motif DNA as a pH-responsive nanosized cross-linker. To fabricate microfibers, we spun the i-motif DNA nanolinker-conjugated CNT-based hybrid material in a proton-rich coagulation bath. The attained hybrid ...