From function-guided assembly of a lotus leaf-like ZnO nanostructure to a formaldehyde gas-sensing application

摘要: Abstract A facile solution-based route is developed for the preparation of aligned lotus leaf-like ZnO nanostructure via an immersion oriented nanorods in hexamethylenetetramine solution at a water-bath temperature 90 °C. During immersion, morphology-evolution from nanorod to and nanosheet obtained by simple change heat-time. From gas-sensing measurement, as-prepared has superior response low-concentration formaldehyde. The may attribute large surface-to-volume ratio, complete depletion carriers inside leaves, direct transport between leaves conductive substrate. Based on ideal crystal-growth mode proposed periodic bond chain (PBC) theory, preferential a- b-axis growth mechanism suggested understand formation nanostructure. Furthermore, nanosheets have extremely thin thicknesses ~2–4 nm matching mean free path electrons, coherence length, screening which be great fundamental significance.