Abstract
We presented the fabrication, characterization, and testing of high-performance and low-power gas sensor toward ethanol. Herein, [5,15-diphenylporphyrinato] nickel (DPPNi) (1) and [5,15-bis(ferrocenylethynyl)-10,20-diphenylporphyrinato] nickel (FcDPPNi) (2) was synthesized. Intermolecular π-π interaction in cooperation with the solvent-solute interaction led to the formation of micro-sheets and micro-flowers for compounds 1 and 2 by solution-vapor annealing method. When applied as gas sensors, both the micro-sheets and micro-flowers exhibited excellent gas sensitivity, good stability and selectivity for ethanol at room temperature. Under the same measurement conditions, the micro-flowers gas sensors revealed lower detection limit and faster recovery times than those for micro-sheets gas sensors, which indicated the effect of the molecular structures and molecular packing mode on tuning the gas sensing performance. The results represented the first example of single-component metalloporphyrin micro-structures for ethanol sensing. Meanwhile, this paper provided a convenient, low cost method for the mass production of low-power gas sensors.
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