Large and Fast Single-Crystal Resistive Humidity Sensitivity of Metal Pnictide Halides Containing van der Waals Host-Guest Interactions

摘要

Two new metal pnictide halides, (Hg_(9.75)As_(5.5))(GaCl_4)_3 and (Hg_(13)Sb_8)(ZnBr_4)_4, have been prepared by solid-state reactions. Their structures feature 3D cationic host frameworks built of mercury pnictide polyhedra and form 1D tunnels filled with discrete guest halide polyanions; the guests and hosts are assembled by van der Waals interactions. Both complexes exhibit good single-crystal humidity sensitivity, with a humidity sensitivity factor as big as three orders of magnitude, a quick resistance response, fast recovery, and good reproducibility. This study provide a new way to design promising resistive humidity detectors by introducing van der Waals host-guest interactions into their structures.