Ammonia sorption studies into thin layers of hexadecafluorinated cobalt phthalocyanine using optical techniques

作者：Basova Tamara V^*; Hassan Aseel

来源：Journal of Porphyrins and Phthalocyanines, 2013, 17(10): 934-940.

DOI：10.1142/S1088424613500570

• phthalocyanine
• thin films
• optical sensors
• spectroscopic ellipsometry
• ammonia

In the present work, the optical response of CoPcF16 films upon exposure to ammonia vapor in the concentration range 50 to 1000 ppm was measured by total internal reflection ellipsometry. It was demonstrated that the sorption of NH3 molecules causes substantial shift of the Delta(lambda) spectrum which is determined by the increase in film thickness and change of its optical parameters. It was found that the CoPcF16 films deposited at substrate temperature of 220 degrees C are characterized by larger grains and more developed surface demonstrating higher optical response than films deposited at substrate temperature of 60 degrees C. In order to gain an insight into the sorption mechanism at molecular level, we have studied the interaction of ammonia vapor with hexadecafluorinated cobalt phthalocyanine using infrared spectroscopy. It was shown that the detection of ammonia was found to be governed primarily by coordination to the metal center.

• 出版日期2013-10