Nano Of Sno <sub> 2 </ Sub> / Naphthalocyanine Copper And Its Hybrid Films And Gas Sensing Properties

Tin dioxide-based thin film sensor has been widely studied due to its high sensitivity, fast response to gases and lower power consumption. In this paper, the aqueous sol of SnO2 ultrafme particles were prepared by the colloid chemistry method. Here We found that the partical properties of SnO2 was concerned with experimental parameters such as type of peptization acid, Sn4+ concentration, peptization time, peptization temperature, ageing time et al. Nanosize SnO2 thin film had been prepared by dip-coating technique, the AFM measurements of thin films showed excellent homogeneous in morphology and ultra-fine grains (<10nm). The experiments illustrated that SnO2 thin films of 20 layers had high sensitivity toward low concentration (5ppm) of n-propyl alcohol gas at room temperature.Octabutoxy-2,3-naphthalocyanine and Octaethyoxyl-2,3-naphthalocyanine were synthesized by using molecular fragments. The naphthalocyanine and its embedded ultrafme particles LB films were sucsessfuly prepared by using Langmuir-Blodgett (LB) technique for the first time. The results of -A isotherm, UV-Vis and FT-IR spectra indicated that the embedded LB films were composed of SnO2 nanoparticles and CuNPc molecules. In addition, after embedded SnO2 ultrafme particals, the sensitivity of hybrid LB films to alcohols was much higher than that of pure CuNPc LB films, for example the sensitivity to 1 ppm ethanol gas was 2.4. The results showed mixed LB films could be further studied as gas-senors to alcohols.