Coating to Kill Germs on Door Handles
PITTSBURGH—Two Hong Kong high schoolers have opened the door to a future without germy door handles.
The young scientists have developed a door handle that can self-sanitize with the help of UV light powered by opening and closing the door.
The research comes from Sum Ming “Simon” Wong, 17, and Kin Pong “Michael” Li, 18, classmates at the Church of Christ in China Tam Lee Lai Fun Memorial Secondary School in Tuen Mun.
The pair recently showcased their handle at the Intel International Science and Engineering Fair, hosted by the Society for Science and the Public, in Pittsburgh.
The society announced the development Wednesday (May 27).
Door handles are some of the most germ-ridden surfaces on buildings. Bacteria living on these surfaces transfer diseases, according to Wong.
Wong and Li wanted to design a coating for handles that would stamp out germs and help reduce disease transmission.
Their coating is based on titanium dioxide, a mineral widely used in paints and coatings for hiding, brightening and whitening. The compound is also found in food, cosmetics and other products.
When lit by ultraviolet light, Wong says TiO2 kills bacteria.
How it Works
However, indoor handles and those used at night are not exposed to such light. Thus, the students decided to light the door handle from within, allowing every part of the handle to experience the light and self-clean.
The door handle is coated with titanium dioxide, which kills bacteria when exposed to UV light, according to the student scientists.
The components of the coated handle include a long cylinder of clear glass fit tightly into a bracket. Inside one end of the bracket is a strong light emitting diode (LED). The students also fashioned a small gear box that attaches to the door.
The UV light is powered by the opening and closing of the door, the students explain.
The door handle system would cost about $13 to build, the students have estimated.
International Science Fair
The Intel International Science and Engineering Fair is the world’s largest international pre-college science competition.
Approximately 1,700 high school students from over 75 countries attend the fair and compete for $4 million in prizes.
Wong and Li were not the only students interested in curbing disease transmission through independent research. The fair’s first-place prize went to Raymond Wang, 17, of Canada, who engineered a new air inlet system for airplane cabins to improve air quality and knock out diseases.
Wang received $75,000 for the development.
In second place, Nicole Ticea, 16, of Canada, received a $50,000 award for developing an inexpensive, easy-to-use, disposable testing device to combat the high rate of undiagnosed HIV infection in low-income communities.