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- W2912388109 abstract "A novel synthesis of In2O3 porous microcolumnar structures (MCs) by a self-sacrificial template route was carried out using MIL-68. Using a modified calcination strategy, the samples could maintain the original metal organic frame work (MOF) morphology with a high gas accessibility after a slow decomposition of organic ligands. Pt nanoparticles (NPs) were loaded on the samples before or after the MOF calcination, leading to different contact states of the Pt NPs and In2O3 matrix. The gas sensing properties of the samples were systematically investigated using a dynamic testing system. Particularly, sample Pt/In2O3 MCs-1 exhibited a superior NO2 sensing performance near room temperature (Rg/Ra = 44.9 at 1 part-per-million and 5.2 at 100 parts-per-billion (ppb)). The sensor resistance could recover to its baseline even at 40 °C after purging with air without any additional treatment. This can be attributed to the chemical sensitisation of the Pt NPs as well as large contents of pores and channels for gas diffusion. The introduction of humidity in the gas mixture could remarkably decrease the sensor response and recovery times owing to the ‘wet’ NO2 adsorption mechanism. This study demonstrated a novel synthesis route of Pt-loaded In2O3 porous columnar structures and its potential applications in near-room-temperature detection of ppb-level NO2." @default.
- W2912388109 created "2019-02-21" @default.
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- W2912388109 date "2019-06-01" @default.
- W2912388109 modified "2023-10-17" @default.
- W2912388109 title "Metal-organic-framework-derived In2O3 microcolumnar structures embedded with Pt nanoparticles for NO2 detection near room temperature" @default.
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- W2912388109 doi "https://doi.org/10.1016/j.ceramint.2019.02.020" @default.
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