Metal phthalocyanine (MPcs), a group of typical molecular semiconductors, can bind a wide range of analytes through coordination with their metal centers. These molecular building blocks have high thermal and chemical stability, easy accessibility, and good compatibility with portable electronics. For these reasons, MPcs have been widely used as the sensory materials in chemiresistive sensing. Although MPcs have realized highly sensitive detection of gaseous molecules1-1 and volatile organic compounds, the relatively moderate to low conductivities of most crystalline films of based on MPc molecules(10-9 to 10−12 S cm−1) requires high driving voltages leading to high energy consumption.3,4 Direct incorporation of the MPcs molecules into a conductive scaffold would provide a sensory material that can meet the requirement for the low-power chemical sensing. This paper describes the integration of metal phthalocyanines into two-dimensional (2D) metal-organic framework (MOF) through the self-assembly with two different metallic nodes. The resulting 2D MOFs exhibit good porosity, and excellent conductivities in the range of 10-2 S cm-1. The chemiresistors fabricated from these MOFs showed excellent response to gaseous analyte, NH3, NO and H2S with sub-ppm detection limits at room temperature. The good conductivity allows the sensors to work under low applied voltage of 0.01 V.

Welding phthalocyanines into bimetallic molecular meshes for low-power chemiresistive detection

256th National Meeting (2018)

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