A Potentiometric [Formula Omitted] Sensor Combined With Composite Metal Oxide and DOP Plasticizer Operative at Low Temperature

A low-temperature lithium ion based potentiometric CO@@d2@ sensor has been developed by adding 10 mol% of SiO@@d2@, B@@d2@O@@d3@, Li@@d2@O, and Bi@@d2@O@@d3@ composite metal oxide mixture to (Li@@d2@-Ba)CO@@d3@ sensing bicarbonate. The sensors added with different mol% of oxides were tested at different operating temperatures. The sensor with 1:2:1:1 mol% of the SiO@@d2@:B@@d2@O@@d3@:Li@@d2@O:Bi@@d2@O@@d3@ composite metal oxide showed a fair Nernstian correlation and obtained n value equal to 2 at 300degC, where n is the number of reaction electrons. A glassy sensing phase resulted that improved response and recovery. The sensor is also found stable against humidity (70% RH) at 300 degC. However, it is further observed that the performance of the sensor deteriorated with increasing Li@@d2@O or decreasing B@@d2@O@@d3@ content. The sensor performance could further be improved at lower temperatures with the introduction of dioctyl phthalate (DOP) plasticizer into the sensing electrode.