Highly Selective and Sensitive Trimethylamine Gas Sensor Based on Cobalt Imidazolate Framework Material

A cobalt imidazolate (im) framework material [Co(im)(2)](n) was employed to use as a trimethylamine (TMA) gas sensor and the [Co(im)(2)](n) sensor can be easily fabricated by using Ag-Pd interdigitated electrodes. Gas sensing measurement indicated that the [Co(im)(2)](n) sensor shows excellent selectivity, high gas response and a low detection limit level of 2 ppm to TMA at 75 degrees C. The good selectivity and high response to TMA of the sensor based on [Co(im)(2)](n) may be attributed to the weak interaction between the TMA molecules and the [Co(im)(2)](n) framework. That may provide an ideal candidate for detecting freshness of fish and seafood.