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. 2022 Jan 26;20(2):103. doi: 10.3390/md20020103

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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SEM micrographs of blank chitosan film at (A) 100× and (B) 500×; of 2-amino-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carbonitrile (6CN) at (C) 150× and (D) 500×; of 6CN-chitosan films with 6CN concentration of 0.48 mg·mL⁻¹ (F3) at (E) 100×, (F) 500×, (G) 1000×, and (H) 10,000×; of 6CN-chitosan films with 6CN concentration of 0.80 mg·mL⁻¹ (F5) at (I) 100×, (J) 500×, (K) 1000×, and (L) 10,000×; of 6CN-chitosan films with 6CN concentration of 1.28 mg·mL⁻¹ (F8) at (M) 100×, (N) 500×, (O) 1000×, and (P) 10,000×.