Fig. 3: Electrochemical and structural characterization of the 3D-BMN.
From: 3D-printed barbed microneedle electrodes for biosensing and drug delivery in wound management
a SEM images of spray-coated Ag/AgCl microneedles and AuNPs-deposited microneedles. i Spray-coated Ag/AgCl microneedles. ii AuNPs-deposited microneedles. iii Spray-coated Ag/AgCl microneedles vs. Comparison of AuNPs-deposited microneedles under different sodium citrate concentrations. b EDS elemental mapping of spray-coated Ag/AgCl microneedles and AuNPs-deposited microneedles under varying sodium citrate concentrations. i Spray-coated Ag/AgCl microneedles. ii AuNPs-deposited microneedles in 0.7% sodium citrate solution. iii. AuNPs-deposited microneedles in 1.0% sodium citrate solution. iv AuNPs-deposited microneedles in 1.5% sodium citrate solution. The red line indicates the edge of the microneedles. c Schematic diagram of 3D-BMN testing for EIS and CV. d Comparative EIS curves of four microneedle types under different NaCl concentrations. i 0.1% NaCl concentration. ii 0.3% NaCl concentration. iii 0.5% NaCl concentration. e Comparative CV curves of four microneedle types
