COVID-19 Mask: Hong Kong Researchers Develop New Graphene Face Masks That Deactivates Coronaviruses And Has High Anti-Bacterial Efficiency

COVID-19 Mask: A study and development team from the City University of Hong Kong (CityU) has successfully produced graphene masks with an anti-bacterial efficiency of 80%, which can be enhanced to almost 100% with exposure to sunlight for around 10 minutes. Initial tests also showed very promising results in the deactivation of two species of coronaviruses. The graphene masks are easily produced at low cost, and can help to resolve the problems of sourcing raw materials and disposing of non-biodegradable masks.


The study team led by Dr Ye uses the CO2 infrared laser system to
generate graphene. Credit: City University of Hong Kong

The study and development was published in the scientific journal: ACS Nano. https://pubs.acs.org/doi/10.1021/acsnano.0c05330
 
Face masks have become an important tool in fighting against the COVID-19 pandemic despite initial skepticism by the WHO, U.S. Health Agencies and Westerners in general. As the world embraces the usefulness of mask to help combat COVID-19, it should be noted that improper use or disposal of masks may lead to “secondary transmission.”
 
The new research was conducted by Dr Ye Ruquan, Assistant Professor from City University of Hong Kong’s Department of Chemistry, in collaboration with other researchers.
 
It should also be noted that current used surgical masks are not anti-bacterial. Hence this may lead to the risk of secondary transmission of bacterial infection when individuals touch the contaminated surfaces of the used masks or discard them improperly.
 
Furthermore, the melt-blown fabrics used as a bacterial filter poses an impact on the environment as they are difficult to decompose. Therefore, scientists have been looking for alternative materials to make masks.
 
The study team led by Dr Ye has been studying the use of laser-induced graphene in developing sustainable energy.
 
Dr Ye said that when he was studying PhD degree at Rice University several years ago, the research team he participated in and led by his supervisor discovered an easy way to produce graphene.
 
The researchers then found that direct writing on carbon-containing polyimide films (a polymeric plastic material with high thermal stability) using a commercial CO2 infrared laser system can generate 3D porous graphene. The laser changes the structure of the raw material and hence generates graphene. That’s why it is named laser-induced graphene.
 
Typically graphene is known for its anti-bacterial properties, so as early as last September, before the outbreak of COVID-19, producing outperforming masks with laser-induced graphene already came across Dr Ye’s mind. He then kick-started the study in collaboration with researchers from the Hong Kong University of Science and Technology (HKUST), Nankai University, and other organizations.
 
The study team tested their laser-induced graphene with E. coli bacteria and it achieved high anti-bacterial efficiency o f about 82%. In comparison, the anti-bacterial efficiency of activated carbon fiber and melt-blown fabrics, both commonly-used materials in masks, were only 2% and 9% respectively.
 
Detailed experiment results also showed that over 90% of the E. coli deposited on them remained alive even after 8 hours, while most of the E. coli deposited on the graphene surface were dead after 8 hours.
 
Significantly, the laser-induced graphene showed a superior anti-bacterial capacity for aerosolized bacteria.
 
The study team said that more research on the exact mechanism of graphene’s bacteria-killing property is needed. But Dr Ye believed it might be related to the damage of bacterial cell membranes by graphene’s sharp edge. And the bacteria may be killed by dehydration induced by the hydrophobic (water-repelling) property of graphene.
 
Past studies suggested that COVID-19 would lose its infectivity at high temperatures. So the team carried out experiments to test if the graphene’s photothermal effect (producing heat after absorbing light) can enhance the anti-bacterial effect.
 
The study results showed that the anti-bacterial efficiency of the graphene material could be improved to 99.998% within 10 minutes under sunlight, while activated carbon fiber and melt-blown fabrics only showed an efficiency of 67% and 85% respectively.
 
The study team is currently working with laboratories in mainland China to test the graphene material with two species of human coronaviruses.
 
Initial tests showed that it inactivated over 90% of the human coronavirus strains in five minutes and almost 100% in 10 minutes under sunlight. The team plans to conduct testings with the COVID-19 virus later.
 
The study team next plans are to further enhance the anti-virus efficiency and develop a reusable strategy for the mask. They hope to release it to the market shortly after designing an optimal structure for the mask and obtaining the certifications.
 
The study team described the production of laser-induced graphene as a “green technique.” All carbon-containing materials, such as cellulose or paper, can be converted into graphene using this technique. And the conversion can be carried out under ambient conditions without using chemicals other than the raw materials, nor causing pollution. And the energy consumption is low.
 
Dr Ye further added, “Laser-induced graphene masks are reusable. If biomaterials are used for producing graphene, it can help to resolve the problem of sourcing raw material for masks. And it can lessen the environmental impact caused by the non-biodegradable disposable masks.”
 
The study team pointed out that producing laser-induced graphene is easy. Within just one and a half minutes, an area of 100cm² can be converted into graphene as the outer or inner layer of the mask. Depending on the raw materials for producing the graphene, the price of the laser-induced graphene mask is expected to be between that of surgical mask and N95 mask. He added that by adjusting laser power, the size of the pores of the graphene material can be modified so that the breathability would be similar to surgical masks.
 
Interestingly to facilitate users to check whether graphene masks are still in good condition after being used for a period of time, the study team fabricated a hygroelectric generator. It is powered by electricity generated from the moisture in human breath. By measuring the change in the moisture-induced voltage when the user breathes through a graphene mask, it provides an indicator of the condition of the mask.


The team fabricates a hygroelectric generator to measure the change in
the moisture-induced voltage when the user breathes through the graphene mask. 

Study results showed that the more the bacteria and atmospheric particles accumulated on the surface of the mask, the lower the voltage resulted. “The standard of how frequently a mask should be changed is better to be decided by the professionals. Yet, this method we used may serve as a reference,” suggested Dr Ye.
 
The team has already patented the laser-induced graphene (LIG) technique and is already working with a few manufacturers all over Asia to start commercial productions of these masks which are expected to hit the markets in less than a fortnight.
 
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