TY - JOUR
T1 - Hybrid (Ag)ZnO/Cs/PMMA nanocomposite thin films
AU - Viorica, Ghisman Plescan
AU - Musat, Viorica
AU - Pimentel, Ana
AU - Calmeiro, Tomas R.
AU - Carlos, Emanuel
AU - Baroiu, Liliana
AU - Martins, Rodrigo
AU - Fortunato, Elvira
PY - 2019/9/30
Y1 - 2019/9/30
N2 - Combining well known oxide materials with biocompatible polymers such as chitosan (Cs) and antimicrobial agents such as Ag can bring new functionalities to materials for electronics and lead to new border applications in the field of stretchable wearable bioelectronics and drug delivery systems. The paper reports on new hybrid thin films based on zinc oxide (ZnO) and Ag:ZnO nanoparticles dispersed in chitosan and incorporated in poly(methyl methacrylate) (PMMA) matrix by a modified sol-gel method. The structure, morphology, optical, electrical and antimicrobial properties of the obtained hybrid ZnO/Cs/PMMA and Ag:ZnO/Cs/PMMA thin films have been investigated. For electric characterization, current-voltage, capacitance-voltage and dielectric constant-frequency curves of the one and two-layers hybrid thin films deposed in MIS structure have been recorded. The dielectric constant values between 9.5 and 14.9 at 20 kHz, in addition with low surface roughness, optimal optical transmittance in visible and near-infrared region of about 90% and optical band gap (Eg) values between 3.543 and 3.737 eV, indicate high potential applications of the obtained hybrid films in transparent bioelectronics. The antimicrobial activity of the hybrid sols used for the film's deposition and the resulted thin films have been investigated using the paper disc method on Mueller-Hinton agar against Gram negative E. coli and Gram positive S. aureus bacteria. Ag:ZnO/Cs/PMMA films showed good antimicrobial activity against S. aureus and E. coli.
AB - Combining well known oxide materials with biocompatible polymers such as chitosan (Cs) and antimicrobial agents such as Ag can bring new functionalities to materials for electronics and lead to new border applications in the field of stretchable wearable bioelectronics and drug delivery systems. The paper reports on new hybrid thin films based on zinc oxide (ZnO) and Ag:ZnO nanoparticles dispersed in chitosan and incorporated in poly(methyl methacrylate) (PMMA) matrix by a modified sol-gel method. The structure, morphology, optical, electrical and antimicrobial properties of the obtained hybrid ZnO/Cs/PMMA and Ag:ZnO/Cs/PMMA thin films have been investigated. For electric characterization, current-voltage, capacitance-voltage and dielectric constant-frequency curves of the one and two-layers hybrid thin films deposed in MIS structure have been recorded. The dielectric constant values between 9.5 and 14.9 at 20 kHz, in addition with low surface roughness, optimal optical transmittance in visible and near-infrared region of about 90% and optical band gap (Eg) values between 3.543 and 3.737 eV, indicate high potential applications of the obtained hybrid films in transparent bioelectronics. The antimicrobial activity of the hybrid sols used for the film's deposition and the resulted thin films have been investigated using the paper disc method on Mueller-Hinton agar against Gram negative E. coli and Gram positive S. aureus bacteria. Ag:ZnO/Cs/PMMA films showed good antimicrobial activity against S. aureus and E. coli.
KW - (Ag)ZnO/Cs/PMMA hybrids
KW - Antimicrobial properties
KW - Dielectric films
KW - Electrical properties
KW - Modified sol-gel method
KW - Optical properties
UR - http://www.scopus.com/inward/record.url?scp=85068204503&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.06.373
DO - 10.1016/j.jallcom.2019.06.373
M3 - Article
AN - SCOPUS:85068204503
SN - 0925-8388
VL - 803
SP - 922
EP - 933
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -