The gas sensitivity of a substituted metallophthalocyanine, tetra-iso-propoxyphthalocyaninato copper (II)

A gas sensor based on tetra-iso-propoxyphthalocyaninato copper (II) (i-Pro-CuPc) was fabricated by spin coating, and its gas sensitivities were measured in different concentration of NO2 atmosphere. The metallophthalocyanine possesses not only good solubility in common organic solvents, but also good film forming ability. The results showed ideal gas sensitivity at 65°C and a good linear relationship existed between the resistance of i-Pro-CuPc gas sensor and the concentration of NO2. Temperature had significant influences both on the recovery and cyclic properties of the gas sensor and on its conductivity. The ln(conductivity) varied linearly with 1000/T, from this linear relationship, the values of activation energy and σ0 of i-Pro-CuPc were calculated to be about 0.72 eV and 3.87×10−6 Ω−1 cm−1, respectively.