Synthesis and gas sensing properties of MoS2 and Pd NPs functionalized conductive Mg3(HITP)2 hybrid structures toward NO2 detection in ultrahigh humidity environment at room temperature

Abstract

In this work, two-dimensional (2D) conductive metal–organic frameworks Mg₃(HITP)₂ nanosheet functionalized with MoS₂ and Pd NPs hybrid structures were synthesized toward NO₂ detection under ultrahigh humid atmosphere at room temperature (RT). The morphology, chemical state and element composition were systematically investigated by different methods, and gas sensing experiments were conducted on the as-proposed sensors toward NO₂ at RT under 95 %RH. Obviously, the optimum Pd₁/Mo₁₀/MgHI sensor exhibits high response, good linearity, excellent selectivity and repeatability, and the measured response can reach to 55 toward 100 ppm NO₂, which is almost two times higher than that of Mo₁₀/MgHI sensor (28). The enhanced NO₂ sensing performance can be attributed to the synergistic effect between the interfaces of the sensing nanocomponents, which opens a new way for detecting NO₂ under ultrahigh humid environment at RT.