The temperature sensor shows a large negative temperature coefficient of resistance (TCR) in the range of -3100 ppmK-1 to -4900 ppmK-1 which is comparable to the available commercial temperature sensors, and activation energy of 34.85 meV. The IR sensor shows a high responsivity of 58.5 VW-1 which is greater than the IR sensors reported with similar dimensions. This approach doesn’t involve any expensive cleanroom processing nor usage of harmful gases, liquid chemicals and toxic materials and hence, commercialization of this technology is a low cost, low energy and environmentally benign process.

The successful fabrication of solution-free all carbon paper electronics indicates that it is feasible to implement eco-friendly electronics in various fields of applications such as remote healthcare and in-field environment monitoring without compromising the efficiency and performance, where factors such as environment, cost, resources and energy required for mass production are concerns and size of the device is not a constraint.

More information about this research can be found in the journal Nanotechnology 27 095206.

For more state of the art research in paper electronics, visit the Nanotechnology speical issue on paper electronics with guest editors Ronald Österbacka and Jin-Woo Han.