Abstract
A facile and versatile method is reported to fabricate the interwoven tubular hierarchy ofSnO2 films using a biotemplate eggshell membrane (ESM) combinedsol–gel approach. In order to promote the crystallization ofSnO2 films, calcination is necessary and can adjust the size of the building unitsin the range 2.8–26 nm. Under the direction of ESM biomacromolecules,SnO2 nanocrystallites come into being and assemble into nanotubes, and furtherpattern porous hierarchical meshworks to faithfully retain the morphologyof natural ESM. The sensor performance of as-prepared biomorphicSnO2 was measured for ethanol, liquefied petroleum gas (LPG),H2S, and gasoline. Itis found that the SnO2 hierarchical films obtained have a good selectivity for LPG with a working temperature above300 °C while forethanol below 270 °C.
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