Hierarchical hollow ZnO cubes constructed using self-sacrificial ZIF-8 frameworks and their enhanced benzene gas-sensing properties

Abstract

Novel hierarchical ZnO hollow cubes are constructed using the interpenetrated 0D nanoparticles through directly decomposing the Zn-based metal-organic frameworks (Zn-MOF, ZIF-8). After decomposition at 450 1C for 1 h, the as-prepared ZnO well maintains the original ZIF-8 shape with relatively high surface area (45 m 2 g À1 ), thereby realizing fast surface reaction kinetics of benzene molecules. In contrast to singular 0D ZnO nanoscale counterparts, the unique ZnO nanostructure assembly renders the well exposed surfaces and defect states, enhancing significantly chemical sensitivity towards gaseous benzene. The present work provides a facile and versatile approach for designing the high-performance chemical sensing materials.

Zinc oxide-decorated polypyrrole/chitosan bionanocomposites with enhanced photocatalytic, antibacterial and anticancer performance

“…The pattern of chitosan shows hkl values of (020) corresponding to a 2 θ value of 21.3°, 34 while that of Ppy shows hkl values of (104) at a 2 θ value of around 22.7°, which are in accordance with the findings reported by Li et al 35 The diffraction peaks of ZnO were detected at 2 θ values of 32.2°, 34.6°, 36.5°, 47.7°, 56.7°, 63.1°, and 68.2° corresponding to hkl values of (100), (002), (101), (102), (110), (103), and (200). 36 The spectral peaks of chitosan and Ppy in the pattern of Ppy/C/Z have been shifted slightly from their actual positions, probably due to the dislocation effect upon incorporation. 37 The sharp diffraction peaks at the abovementioned angles indicate the crystalline behaviour of the bio-nanocomposite.…”

“…The human cervical cancer cell line (HeLa) was used in the current study. 36 The spectral peaks of chitosan and Ppy in the pattern of Ppy/C/Z have been shied slightly from their actual positions, probably due to the dislocation effect upon incorporation. 37 The sharp diffraction peaks at the abovementioned angles indicate the crystalline behaviour of the bio-nanocomposite.…”

Morphology inherence from hollow MOFs to hollow carbon polyhedrons in preparing carbon-based electrocatalysts

“…14 It is very challenging to prepare hollow carbon nanostructures with controlled morphologies in a more facile manner. [15][16][17] Metal-organic framework (MOF) and MOF hybrids are an emerging class of crystalline porous materials with extensive applications. [18][19][20][21][22][23][24][25][26][27] Direct carbonization of MOF precedents has been exemplified as an ideal route to prepare porous carbon materials.…”

Ethanol Sensing Properties and First Principles Study of Au Supported on Mesoporous ZnO Derived from Metal Organic Framework ZIF-8

“…This may be because Au ions dispersed in the pores of the metal-organic framework, which increases the stability of the ZIF-8 structure during the calcination process. In addition, ZIF-8 is a porous material with high porosity [ 33 ]. The 3D Au/ZnO materials prepared with ZIF-8 as a template also have a larger porosity, which is conducive to gas diffusion and increases the gas-sensitive reaction.…”