Abstract
Room temperature Cl2 sensing characteristics of highly selective spin coated Zn (II) 1,4,8,11,15,18,22,25-octabutoxy-29H,31H-phthalocyanine (ZnPc(OBu)8) film and self-assembled nanobelts (NBs) have been studied in the concentration range of 5–1500ppb. UV–Visible absorption spectroscopic studies indicate the formation of J-type aggregates in case of ZnPc(OBu)8 film and H-type aggregates in NBs. The electrical conductance of NBs is found to be 60% more than ZnPc(OBu)8 film. For 1500ppb of Cl2, the response of ZnPc(OBu)8 film and NBs is 522% and 655% with a response time of 25s and 15s, respectively. The detection limit of ZnPc film is lowered from 50ppb to 5ppb by making butoxy substitution. X-ray photoelectron spectroscopic studies reveal that absorption sites predominantly are the central metal ions of ZnPc(OBu)8 molecules. The results obtained are compared with Cl2 sensing characteristics of unsubstituted ZnPc film to show the effect of butoxy substitution and NBs formation.
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