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Piezoresistive and Electrical Properties of a Catecholic Amino Acid-Polyacrylamide Single-Walled Carbon Nanotube Hydrogel Hybrid Network

Journal Article


Abstract


  • We have developed a functional hydrogel combining the advantages of single-walled carbon nanotube (SWCNT) hydrogels and 3,4-dihydroxy-l-phenylalanine (l-DOPA) that would be expected to lead to a material with elevated piezoresistive ability. SWCNT hydrogel precursors were thus embedded into the catecholic amino acid 3,4-dihydroxy-l-phenylalanine-polyacrylamide (l-DOPA-PAM) hydrogel to form a l-DOPA-PAM-SWCNT hydrogel hybrid network. This hybrid network as formed was soft but became a hard gel at room temperature. An advantage of this material design is the prevention of overoxidation of l-DOPA to maintain enough free catechol groups to endow the desired properties. Several characterization techniques, including optical microscopy, field-emission scanning electron microscopy, Raman spectroscopy, and dynamic mechanical analysis, were utilized to characterize the l-DOPA-PAM-SWCNT hydrogel hybrid network. The negative piezoresistive effect and electrical properties of the l-DOPA-PAM hydrogel and the l-DOPA-PAM-SWCNT hydrogel hybrid network were measured under different pressures and at different times after the application of pressure started, demonstrating the potential for pressure-sensing applications.

Publication Date


  • 2021

Citation


  • Zhang, H., Yan, Q., Horvat, J., & Lewis, R. A. (2021). Piezoresistive and Electrical Properties of a Catecholic Amino Acid-Polyacrylamide Single-Walled Carbon Nanotube Hydrogel Hybrid Network. ACS Applied Polymer Materials, 3(2), 671-678. doi:10.1021/acsapm.0c00983

Scopus Eid


  • 2-s2.0-85099949368

Start Page


  • 671

End Page


  • 678

Volume


  • 3

Issue


  • 2

Abstract


  • We have developed a functional hydrogel combining the advantages of single-walled carbon nanotube (SWCNT) hydrogels and 3,4-dihydroxy-l-phenylalanine (l-DOPA) that would be expected to lead to a material with elevated piezoresistive ability. SWCNT hydrogel precursors were thus embedded into the catecholic amino acid 3,4-dihydroxy-l-phenylalanine-polyacrylamide (l-DOPA-PAM) hydrogel to form a l-DOPA-PAM-SWCNT hydrogel hybrid network. This hybrid network as formed was soft but became a hard gel at room temperature. An advantage of this material design is the prevention of overoxidation of l-DOPA to maintain enough free catechol groups to endow the desired properties. Several characterization techniques, including optical microscopy, field-emission scanning electron microscopy, Raman spectroscopy, and dynamic mechanical analysis, were utilized to characterize the l-DOPA-PAM-SWCNT hydrogel hybrid network. The negative piezoresistive effect and electrical properties of the l-DOPA-PAM hydrogel and the l-DOPA-PAM-SWCNT hydrogel hybrid network were measured under different pressures and at different times after the application of pressure started, demonstrating the potential for pressure-sensing applications.

Publication Date


  • 2021

Citation


  • Zhang, H., Yan, Q., Horvat, J., & Lewis, R. A. (2021). Piezoresistive and Electrical Properties of a Catecholic Amino Acid-Polyacrylamide Single-Walled Carbon Nanotube Hydrogel Hybrid Network. ACS Applied Polymer Materials, 3(2), 671-678. doi:10.1021/acsapm.0c00983

Scopus Eid


  • 2-s2.0-85099949368

Start Page


  • 671

End Page


  • 678

Volume


  • 3

Issue


  • 2