Development of robust Cu2O and ZnO coated polypropylene fabrics by AP-SALD for antimicrobial applications
MetadataShow full item record
Nowadays, the textile industry is revolutionizing by adding special functionalities and properties to textiles. Especially with the emergence of COVID-19, textile functionalization has attracted the focus of researchers for antimicrobial applications. Cuprous oxide (Cu2O) and zinc oxide (ZnO) are two oxides, which are known to have antiviral and antibacterial properties, respectively. Atmospheric-pressure spatial atomic layer deposition (AP-SALD) is a relatively new method, which allows high-quality, high-throughput, conformal, pinhole-free, uniform coatings at the nanometer scale and eliminates the slow speed and vacuum requirements that hinder conventional atomic layer deposition. In this thesis, spun-bond polypropylene (PP) fabrics that are used as an outer layer of N95 respirators were coated with Cu2O and ZnO nanocoatings by AP-SALD. To the best of my knowledge, this is the first time that fabrics have been coated by AP-SALD, which is a promising method for mass production. An important property that textile coatings must have is good adhesion, which was fulfilled by AP-SALD in this work. Unlike coatings on rigid substrates, measuring the thickness of coatings on textiles is challenging due to the porosity and uneven surface of fabrics. In-situ reflectometry was utilized to study the growth rate of coatings by applying the Virtual Interface Method (VIM), which uses the reflectance intensity at a single wavelength over time. The growth rate per cycle (GPC) of depositions was estimated by analyzing the resulting damped oscillatory pattern. The purpose of coating the spun-bond PP is to use it, especially Cu2O-coated PP, for antimicrobial N95 respirators. For this reason, it is important to ensure that coatings do not affect the filtration efficiency of fabrics. Penetration percentages (100 – filtration efficiency) of coated fabrics were measured. Results indicate that the coatings do not have an obvious impact on the filtration efficiency. Finally, since it is well-known that Cu2O shows an excellent antiviral performance against many viruses, including SARS-CoV-2, the cytotoxicity of Cu2O coatings deposited by AP-SALD against living cells was examined with Alamar blue (AB) and 5-carboxyfluorescein diacetate (CFDA) assays to check their compatibility for human use. Based on the results, Cu2O – coated PP fabrics coated at 100 °C seem to be safe for use in N95 respirators.
Cite this version of the work
Guvanch Gurbandurdyyev (2022). Development of robust Cu2O and ZnO coated polypropylene fabrics by AP-SALD for antimicrobial applications. UWSpace. http://hdl.handle.net/10012/17824