Fabrication and good ethanol sensing of biomorphic SnO2 with architecture hierarchy of butterfly wings

F Song, H Su, J Han, D Zhang, Z Chen - Nanotechnology, 2009 - iopscience.iop.org
F Song, H Su, J Han, D Zhang, Z Chen
Nanotechnology, 2009iopscience.iop.org
Using super-hydrophobic butterfly wings as templates, we developed an aqueous sol–gel
soakage process assisted by ethanol-wetting and followed by calcination to fabricate well-
organized porous hierarchical SnO 2 with connective hollow interiors and thin mesoporous
walls. The exquisite hierarchical architecture of SnO 2 is faithfully replicated from the
lightweight skeleton of butterfly wings at the level from nano-to macro-scales. On the basis of
the self-assembly of SnO 2 nanocrystallites with diameter around 7.0 nm, the interconnected …
Abstract
Using super-hydrophobic butterfly wings as templates, we developed an aqueous sol–gel soakage process assisted by ethanol-wetting and followed by calcination to fabricate well-organized porous hierarchical SnO 2 with connective hollow interiors and thin mesoporous walls. The exquisite hierarchical architecture of SnO 2 is faithfully replicated from the lightweight skeleton of butterfly wings at the level from nano-to macro-scales. On the basis of the self-assembly of SnO 2 nanocrystallites with diameter around 7.0 nm, the interconnected tubes (lamellas), the fastigiated hollow tubers (pillars) and the double-layered substrates further construct the biomorphic hierarchical architecture. Benefiting from the small grain size and the unique hierarchical architecture, the biomorphic SnO 2 as an ethanol sensor exhibits high sensitivity (49.8 to 50 ppm ethanol), and fast response/recovery time (11/31 s to 50 ppm ethanol) even at relatively low working temperature (170 C).
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