Copper layers sputtered on PTFE: Effect of annealing on antibacterial performance

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F20%3A43921119" target="_blank" >RIV/60461373:22310/20:43921119 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22330/20:43921119

Výsledek na webu

<a href="https://doi.org/10.1016/j.mtcomm.2020.101207" target="_blank" >https://doi.org/10.1016/j.mtcomm.2020.101207</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mtcomm.2020.101207" target="_blank" >10.1016/j.mtcomm.2020.101207</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Copper layers sputtered on PTFE: Effect of annealing on antibacterial performance

Popis výsledku v původním jazyce

The mechanism of antibacterial effect of copper nanostructures is still not fully recognized. Therefore, the goal of our work lies in investigating the impact of Cu sputtering and post-deposition annealing on surface and antibacterial properties of Cu layers created on polytetrafluoroethylene (PTFE). Subsequent annealing revealed intensified oxidation and rearrangement in the surface of Cu layers. Non-annealed Cu layers on PTFE consisted of Cu° and a mixture of Cu1+ and Cu2+ oxides. These layers exhibited properties similarly to bulk Cu, which were represented by surface plasmon resonance (SPR) band in UV–vis spectra and a soar in electrical conductance. On the contrary, annealed Cu layers possessed these characteristics leaving high electrical resistance and no SPR band. Moreover, X-ray photoelectron spectroscopy results revealed that the annealed layers prevailed of Cu2+ oxides and the annealing process led to the formation of an island crystalline structure, disruption of layer continuity and exposure of the PTFE surface. Although the annealing process was not followed by significant changes in surface roughness, the island-like structure was well defined in atomic force and scanning electron microscopy images. Antibacterial tests were evaluated against Staphylococcus epidermidis and Escherichia coli. Annealed samples showed less pronounced antibacterial effect while non-annealed Cu layers sputtered for 400 s demonstrated the highest antibacterial effect against both bacterial strains. Such nanostructured substrates are promising for flexible electronics and biomedical application (i.e. bacterial biofilm inhibition).

Název v anglickém jazyce

Copper layers sputtered on PTFE: Effect of annealing on antibacterial performance

Popis výsledku anglicky

The mechanism of antibacterial effect of copper nanostructures is still not fully recognized. Therefore, the goal of our work lies in investigating the impact of Cu sputtering and post-deposition annealing on surface and antibacterial properties of Cu layers created on polytetrafluoroethylene (PTFE). Subsequent annealing revealed intensified oxidation and rearrangement in the surface of Cu layers. Non-annealed Cu layers on PTFE consisted of Cu° and a mixture of Cu1+ and Cu2+ oxides. These layers exhibited properties similarly to bulk Cu, which were represented by surface plasmon resonance (SPR) band in UV–vis spectra and a soar in electrical conductance. On the contrary, annealed Cu layers possessed these characteristics leaving high electrical resistance and no SPR band. Moreover, X-ray photoelectron spectroscopy results revealed that the annealed layers prevailed of Cu2+ oxides and the annealing process led to the formation of an island crystalline structure, disruption of layer continuity and exposure of the PTFE surface. Although the annealing process was not followed by significant changes in surface roughness, the island-like structure was well defined in atomic force and scanning electron microscopy images. Antibacterial tests were evaluated against Staphylococcus epidermidis and Escherichia coli. Annealed samples showed less pronounced antibacterial effect while non-annealed Cu layers sputtered for 400 s demonstrated the highest antibacterial effect against both bacterial strains. Such nanostructured substrates are promising for flexible electronics and biomedical application (i.e. bacterial biofilm inhibition).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA20-01768S" target="_blank" >GA20-01768S: Inteligentní magnetické materiály: od objemových systémů ke „spinterface“</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Today Communications

ISSN

2352-4928

e-ISSN

—

Svazek periodika

24

Číslo periodika v rámci svazku

SEP 2020

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

"101207/1"-12

Kód UT WoS článku

000571137400008

EID výsledku v databázi Scopus

2-s2.0-85084791750