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Fabrication and Mechanical Properties of Large‐Scale Freestanding Nanoparticle Membranes
Author(s) -
He Jinbo,
Kanjanaboos Pongsakorn,
Frazer N. Laszlo,
Weis Adam,
Lin XiaoMin,
Jaeger Heinrich M.
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201000114
Subject(s) - membrane , materials science , fabrication , nanoparticle , nanotechnology , monolayer , ligand (biochemistry) , particle (ecology) , core (optical fiber) , composite material , chemistry , medicine , biochemistry , alternative medicine , receptor , oceanography , pathology , geology
Thin‐film membranes consisting of nanoparticles are of interest in applications ranging from nanosieves to electric, magnetic, or photonic devices and sensors. However, the fabrication of large‐scale membranes in a simple but controlled way has remained a challenge, due to the limited understanding of their mechanical properties. Systematic experiments on ultrathin, freestanding nanoparticle membranes of different core materials, core sizes, and capping ligands are reported. The results demonstrate that a drying‐mediated self‐assembly process can be used to create close‐packed monolayer membranes that span holes tens of micrometers in diameter. Containing up to ≈10 7 particles, these freely suspended layers exhibit remarkable mechanical properties with Young's moduli of the order of several GPa, independent of membrane size. Comparison of three different core–ligand combinations suggests that the membrane's elastic response is set by how tightly the ligands are bound to the particle cores and by the ligand–ligand interactions.