Electrical conductivity and electrode properties of the chalcogenide films PbS-AgI-As<sub>2</sub>S<sub>3</sub>, PbS-Ag<sub>2</sub>S-As<sub>2</sub>S<sub>3</sub> and PbI<sub>2</sub>-Ag<sub>2</sub>S-As<sub>2</sub>S<sub>3</sub> obtained by chemical deposition
Chalcogenide films PbS-AgI-As2S3, PbS-Ag2S-As2S3 and PbI2-Ag2S-As2S3, were synthesized from the solutions of chalcogenide glasses in n-butylamine. The electricalconductivity and electrode properties of glasses and films of the same compositions were studied. The synthesis of glasses was carried out according to the procedure described in [Legin, 1985]. The films were prepared as follows. The sample of the glass was placed in boiling n-butylamine, then stirred for 3-4 hours until the glass was completely dissolved in the amine. To prevent oxidation by air oxygen, the films were applied in a closed box under a nitrogen atmosphere. The substrate was placed on a rotating device, a solution was applied thereto, and then the substrate was rotated at a speed of 3000-4000 rpm for 1 minute. Annealing of the films was carried out in the box at a temperature of 90-100 C for 30-60 min. Electrodes with membranes PbS-Ag2S-As2S3 and PbI2-Ag2S-As2S3 showed high sensitivity to cations Pb2+. The Nernst region of the electrode response lies in the range 10-2-10-6 mol/l lead nitrate, and thedetection limit reaches 10-7 mol/l. Thin film electrodes with PbS-AgI-As2S3 membranes showed a fairly high sensitivity to the Ag+ cations. The Nernst region of the electrode response is 10-1-10-6 mol/l silver nitrate, the detection limit of Ag+ cations reaches 10-7 mol/l. It has been established that the electrode properties of chalcogenide glasses and films of similar composition are practically the same.