Before revision: Nanoneedle gets into cells - nanotechweb.org In 2009, researchers at the University of Illinois produced a 50 nm diameter boron-nitride nanoneedle with a thin coating of gold, suitable for biophysical research.
After revision: In 2009, researchers at the University of Illinois produced a 50 nm diameter boron-nitride nanoneedle with a thin coating of gold, suitable for biophysical research.