Construction of Zn/Ni Bimetallic Organic Framework Derived ZnO/NiO Heterostructure with Superior N-Propanol Sensing Performance

Abstract

Bimetallic organic frameworks (Bi-MOFs) have been recognized as one of the most ideal precursors to construct metal oxide semiconductor (MOS) composites, owing to their high surface area, various chemical structures, and easy removal of the sacrificial MOF scaffolds through calcination. Herein, we synthesized Zn/Ni Bi-MOF for the first time via a facile ion exchange postsynthetic strategy, formed a three-dimensional framework consisting of infinite one-dimensional chains that is unattainable through the direct solvothermal approach, and then transformed the Zn/Ni Bi-MOF into a unique ZnO/NiO heterostructure through calcination. Notably, the obtained sensor based on a ZnO/NiO heterostructure exhibits an ultrahigh response of 280.2 toward 500 ppm n-propanol at 275 °C (17.2fold enhancement compared with that of ZnO), remarkable selectivity, and a limit of detection of 200 ppb with a notable response (2.51), which outperforms state-of-the-art n-propanol sensors. The enhanced n-propanol sensing properties may be attributed to the synergistic effects of several points including the heterojunction at the interface between the NiO and ZnO nanoparticles, especially a one-dimensional chain MOF template structure as well as the chemical sensitization effect of NiO. This work provides a promising strategy for the development of a novel Bi-MOF-derived MOS heterostructure or homostructure with well-defined morphology and composition that can be applied to the fields of gas sensing, energy storage, and catalysis.

One-dimensional Z-scheme NiO/Bi2WO6 heterostructures for enhancing visible-light photocatalytic activity

“…As observed in Fig. 2a, the Ni 2p spectrum could be deconvoluted into five peaks: Two major peaks at 879.2 and 872.6 eV correspond to Ni 2p 1/2 spin-orbit states (Zhao et al 2021), while another three peaks at 861.3, 855.8 and 854.0 eV are assigned to Ni 2+ ions (Zhao et al 2009). More exactly, the peak at 854.0 eV is due to NiO 6 octahedral symmetry, and the peak at 855.8 eV is attributed to NiO 5 units or Ni 2+ in pyramidal symmetry (Soriano et al 2007).…”

Electrochemical performance of asymmetric device using the nickel–zinc organometallic structure

“…The XRD pattern of NZMOF/CC shows a mixed phase of Ni and Zn MOF structures, with two distinct broad peaks at 8.92° and 12.7° assigned to the (006) and (200) planes of Ni‐MOF, which are similar to those reported previously, indexed to the Ni MOF (CCDC‐638866). [ 36,39–42 ] In addition, the peaks at approximately 10.3° and 12.6° are attributed to the (111) and (200) planes of the Zn MOF. [ 40,42–44 ] Other diffraction peaks are the overlap of Ni and Zn MOFs.…”

“…200) planes of Ni-MOF, which are similar to those reported previously, indexed to the Ni MOF (CCDC-638866). [36,[39][40][41][42] In addition, the peaks at approximately 10.3 and 12.6 are attributed to the (111) and ( 200) planes of the Zn MOF. [40,[42][43][44] Other diffraction peaks are the overlap of Ni and Zn MOFs.…”

First-Principles Insight into a B4C3 Monolayer as a Promising Biosensor for Exhaled Breath Analysis

“… 3 , 4 Volatile organic compounds (VOCs) identification has become an important objective. 5 – 8 The higher concentration of VOCs in indoor air is detrimental to human health. VOCs having low boiling points and higher vapor pressure, such as methanol, ethanol, formaldehyde, acetone, and ammonia, are the primary causes of indoor air pollution.…”