期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 5, 页码 5195-5208出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b17899
关键词
mesoporous; characterization; ellipsometric porosimetry; AFM; SEM; GISAXS; thin film; structure
资金
- EPSRC [EP/R035105/1, EP/M506448/1, EP/M507970/1, EP/K038656/1]
- Henry Royce Institute [EP/P024947/1, EP/R00661X/1]
- European Union [823717 ESTEEM3]
- EPSRC [EP/P024947/1, EP/R035105/1] Funding Source: UKRI
Mesoporous thin film architectures are an important class of materials that exhibit unique properties, which include high surface area, versatile surface functionalization, and bicontinuous percolation paths through a broad library of pore arrangements on the 10 nm length scale. Although porosimetry of bulk materials via sorption techniques is common practice, the characterization of thin mesoporous films with small sample volumes remains a challenge. A range of techniques are geared toward providing information over pore morphology, pore size distribution, surface area and overall porosity, but none of them offers a holistic evaluation and results are at times inconsistent. In this work, we present a tutorial overview for the reliable structural characterization of mesoporous films. Three model samples with variable pore size and porosity prepared by block copolymer (BCP) coassembly serve for a rational comparison. Various techniques are assessed side-by-side, including scanning electron microscopy (SEM), atomic force microscopy (AFM), grazing incidence small-angle X-ray scattering (GISAXS), and ellipsometric porosimetry (EP). We critically discuss advantages and limitations of each technique and provide guidelines for reliable implementation.
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