In a discovery with applications ranging from hair dyeing to
electronic sensors to development of materials with improved properties,
scientists are reporting the first synthesis of gold nanoparticles inside human
hairs. Their study appears in ACS’ journal Nano Letters.
Philippe Walter and colleagues explain that gold
nanoparticles — 40,000-60,000 of which could fit across the width of a human
hair — are a hot topic. Scientists are exploring uses, ranging from electronics
and sensors to medical diagnostic tests and cancer treatments. Gold
nanoparticles have been deposited on hair for use as electrodes, and gold
nanoparticles had been used to dye wool. Walter’s team looked at a new use —
dyeing hair, inspired by the ancient Greeks’ and Romans’ use of another metal,
lead, to color their hair.