Comparison of interaction mechanisms of copper phthalocyanine and nickel phthalocyanine thin films with chemical vapours. (April 2018)

• Record Type: Journal Article
• Authors: Ridhi, R.; Singh, Sukhdeep; Saini, G.S.S.; Tripathi, S.K.
• Is Part Of: Journal of physics and chemistry of solids. Volume 115(2018)
• Page Start: 119
• Page End: 126
• Publication Date: 2018-04
• Subjects: Copper phthalocyanine -- Nickel phthalocyanine -- Chemical vapours -- Benzene -- Diethylamine -- Bromine; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2017.10.046
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The present study deals with comparing interaction mechanisms of copper phthalocyanine and nickel phthalocyanine with versatile chemical vapours: reducing, stable aromatic and oxidizing vapours namely; diethylamine, benzene and bromine. The variation in electrical current of phthalocyanines with exposure of chemical vapours is used as the detection parameter for studying interaction behaviour. Nickel phthalocyanine is found to exhibit anomalous behaviour after exposure of reducing vapour diethylamine due to alteration in its spectroscopic transitions and magnetic states. The observed sensitivities of copper phthalocyanine and nickel phthalcyanine films are different in spite of their similar bond numbers, indicating significant role of central metal atom in interaction mechanism. The variations in electronic transition levels after vapours exposure, studied using UV–Visible spectroscopy confirmed our electrical sensing results. Bromine exposure leads to significant changes in vibrational bands of metal phthalocyanines as compared to other vapours. Graphical abstract: The six membered ring of Metal Phthalocyanine undergoes interaction with various chemical vapours adsorbed on it. It results in alteration of its electrical, optical and spectroscopic properties. The extent of distortion and sensitivity depends upon the adsorbed vapour and their physical and molecular properties. M in the present case is Cu 2+ and Ni 2+ and interaction with this central metal atom are dependent on its spin, magnetic and spectroscopic properties. Image 1 Highlights: Present study demonstrates the effect of central metal atom on interaction mechanism of metal phthalocyanines with chemical vapours. Thin films of copper phthalocyanine and nickel phthalocyanine prepared using thermal evaporation method of same thickness and similar device geometry were employed to study interaction mechanism. Reducing, oxidizing and a stable aromatic vapour are used as sensing vapours. Nickel phthalocyanine was found to exhibit anomalous behaviour after diethylamine exposure indicating the effect of central metal ion on interaction mechanism of metal phthalocyanine with adsorbed vapour. The observed electrical results were confirmed and analyzed spectroscopically using UV–Visible and Fourier transform infrared spectroscopy.