Large-area nanostructured sensor chips.
(A) AFM image of ordered gold nanoparticle arrays prepared using nanosphere lithography. (B) Plasmon resonance wavelength shifts of the gold nanoparticle arrays at different times after exposure to mercury vapor (A–B adapted from , with permission from Elsevier). (C) SEM image of a Pd nanodisk array used for hydrogen sensing (top) and degradation of the system after several exposure cycles (bottom). (D) Series of measured extinction spectra for the nanodisk array at successively higher hydrogen pressures (C–D adapted with permission from . Copyright 2007 American Chemical Society).