Synthesis of large and uniform Cu3TCPP truncated quadrilateral nano-flake and its humidity sensing properties

Abstract

A type of metalloporphyrin frameworks Cu₃TCPP (TCPP = 5,10,15,20-(4-carboxyphenyl)porphyrin) with uniform flake-like truncated quadrilateral morphology was synthesized by a simple method. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, FT-IR spectroscopy, UV-Vis spectroscopy and TGA experiments were used to characterize the morphologies, structures and compositions of the as-prepared products. The crystal showed good capacitance and humidity sensing properties. Distinct response even for small relative humidity changes was observed, which indicated its potential application as a humidity sensor device. The humidity sensing mechanism is discussed based on the test and analysis of AC impedance spectra and activation energy.