Complex smart dust nanoparticles for hydrogen and chemical sensing.
(A) Low- and high-resolution TEM images of Au/Pd core-shell nanocrystals. (B) Plasmon resonance shift upon hydrogen uptake and release for a single Au/Pd core-shell triangular plate (left) and decahedron (right) (A–B adapted with permission from . Copyright 2011 American Chemical Society). (C) Schematic diagram of single-particle measurement and detection on a single Au@Pt/CdS catalyst particle. (D) Extinction spectra of a single Au@Pt/CdS cube along the reaction progress. (E) Plasmon resonance shift during reaction for the same cube (C–E adapted with permission from . Copyright 2012 American Chemical Society). (F) Schematic of plasmonic probing of local chemical reactions using smart dust nanoparticles (left). Exemplary element-resolved TEM and SEM images of the probing platform (right). (G) Electric near-field distribution at resonance. The intense near-fields are strongly localized at the touching point between the smart dust particle and the Pd film. (G) Time-resolved centroid wavelengths in response to hydrogen uptake and release for a single smart dust particle on a 15 nm Pd film (F–H adapted with permission from . Copyright 2013 American Chemical Society).