Electrical, Optical, and Anti-Microbial Behavior of Copper Nitrates-Doped Chitosan

Area of Science:

• Materials Science
• Biomedical Engineering
• Nanotechnology

Background:

• Chitosan-based copper composites are explored for biomedical and antimicrobial applications.
• Their biocompatibility, adjustable dielectric properties, and ion-mediated antimicrobial effectiveness are key advantages.

Purpose of the Study:

• To investigate the relationship between structural interactions, dielectric relaxation, optical properties, and antimicrobial efficacy of chitosan films doped with copper (II) nitrate.
• To understand the influence of processing conditions on the dielectric and biological properties of these composites.

Main Methods:

• Solution-casting method at room temperature to produce chitosan films with 3, 6, and 9 wt% copper nitrate.
• Physical characterization using FTIR, XRD, optical analysis, and dielectric spectroscopy.
• Biological evaluation of antimicrobial activity.

Main Results:

• FTIR confirmed structural changes in chitosan-copper nitrate composites.
• XRD indicated no CuO peaks, suggesting limited direct antimicrobial contribution from copper oxide.
• Optical analysis revealed an increased band gap with copper (II) nitrate concentration above 3%.
• Electrical impedance increased by approximately one decade, with detailed charge-carrier analysis provided.
• Antimicrobial activity of chitosan was slightly enhanced in a dose-dependent manner by copper (II) nitrate.

Conclusions:

• The study provides a mechanistic understanding of structure-property relationships in copper (II) nitrate-chitosan composites.
• Processing conditions critically influence the dielectric and biological properties of these advanced materials.
• These composites hold potential for biomedical and antimicrobial applications.