This approach eliminates costly metals, toxic chemicals and specialised fabrication infrastructure — opening the door to ...

Researchers at the University of São Paulo (USP) in Brazil have developed a kraft paper-based electrochemical sensor that can detect traces of pesticides in fruit and vegetables in real time when ...

Scientists have created a cheap, paper-based sensor that changes colour to detect deadly gases within minutes, even in high humidity. It could provide a fast, portable tool for environmental ...