Peratech is developing an electronic nose using Quantum Tunnelling Composite material. This new sensor technology detects the presence of Volatile Organic Compounds (VOCs) very rapidly and can recover equally quickly, in a matter of seconds.
QTC materials change their resistance when a force is applied and, in this case, the polymer content of the composite swells when exposed to VOCs. One form of Peratech’s sensor uses a granular type of the QTC material that provides a high surface area for absorption enabling it to detect levels of Volatile Organic Compounds in the region of 10-100 ppm. The sensor rapidly recovers once the VOCs have gone from the surrounding atmosphere and it is the speed of sensing and recovery that marks the difference between QTC sensors and those using other sensing technologies. An additional feature of the QTC technology is that it has very low power requirements.
David Lussey, CTO of Peratech said;
The electronic nose application was developed in conjunction with the Quantum Tunnelling Composite research group at the University of Durham, we are now looking for companies who are interested in licensing the technology from us to develop products.
The conductive particles used in the QTC Electronic Nose have nano-sized features and are distributed in a non-conductive polymer. When a force is applied, the particles move changing the electron flow between the particles (due to an effect called Quantum Tunnelling) giving a measurable change in electrical resistance. In this case, the swelling forces the particles apart, which increases the resistance. The polymer used is selected for its response to the particular VOCs to be monitored.