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A visible multi-response electrochemical sensor based on cellulose nanocrystals.
- Source :
-
Chemical Engineering Journal . Feb2023, Vol. 457, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- [Display omitted] • Colorful cellulose nanocrystal (CNC) – polyaniline (PANI) films were fabricated. • The color of CNC-PANI films changed with humidity, pH and organic solvents. • An environmental monitoring alarm with conductivity changes was demonstrated. • An electrochromic device using CNCs for data encryption was developed. Cellulose nanocrystals (CNCs), a renewable material extracted from plants, algae, and bacteria, form iridescent films with chiral nematic order. Here, we report stimuli-responsive CNC / polyaniline (PANI) composite films for use in optical and electrochemical sensing. CNC-PANI and CNC-glucose-PANI films with bright structural color were obtained by an optimized self-assembly process. The films responded to humidity, pH and organic solvents with a change in the reflection wavelength, change in visible structural color, and changes in conductivity. A two-layer, conductive CNC-PANI film was prepared and incorporated into a circuit, where it could respond to stimuli with a change in color and increased conductivity. Moreover, a PANI electrochromic device (ECD) with CNC films was fabricated for information encryption. With voltages up to 1.5 V, the color of the ECD changed from green to blue within 1 s, and the CNC pattern hidden inside appeared with good cyclability. The ECD can also be used for anti-counterfeiting due to the chiral nematic CNC pattern. This novel iridescent CNC-PANI film demonstrates the potential of visible electrochemical multi-sensing using natural, sustainable materials. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 457
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 161527888
- Full Text :
- https://doi.org/10.1016/j.cej.2022.141175