A paper and pencil solution

Northwestern University researchers have used a pencil and a sheet of paper to draw up a novel analytical device for detecting toxic gases and measuring strain. When you draw a line on a piece of paper with a pencil, the graphite may shed numerous graphene sheets and students wondered whether that might be put to use. Graphene was famously discovered by removing a single graphite layer from a pencil scrawl on a glass slide by scientists at Manchester University in the UK. Jiaxing Huang and colleagues at Northwestern have now drawn chemiresistors on paper, which act as gas sensors and strain gauges. Details of the new work are reported in the paper Pencil Drawn Strain Gauges and Chemiresistors on Paper, published Scientific Reports.