Recently, researchers in the US have explored the use of La0.8Sr0.2MnO3 nanofibres to tackle these issues. The group’s sensor electrode is constructed with numerous electrospun nanofibres with a diameter of around 200 nm as shown in the figure. Electrospinning is a simple and inexpensive technique for scaling up the manufacture of one-dimensional nanostructures.

Compared with conventional micron-sized powders, the nanofibres have a larger specific surface area and form a porous network that facilitates gas diffusion. In addition, the nanofibres are interconnected and form a continuous path for charge transport. The unique architecture increases the electrochemical reaction sites. As a result, the sensor exhibits enhanced sensitivity, lower detection limits and a faster response to the change in the gas concentration.

In the study, a sensor with a nanofibre-based electrode was used to successfully detect carbon monoxide at high temperature (>500 °C). This work demonstrates an effective route to improving the performance of high-temperature electrochemical sensors.

More details can be found in the journal Nanotechnology.