Chemical composition gold particles

SEM has been used to image DNA molecules tagged with gold nanoparticles This technique allowed counting and hence quantitative measurement of the molecules of interest. SEM with EDX has also been employed to measure aerosol particles in workroom air. The size, morphology and chemical composition of over 2000 particles were determined. SEM is useful too for the study of geological materials, grains and crystal structure. 

Table 1. Catalysts chemical composition measured by ICP-OES and average gold particle size derived from XRD measurements.

Suspension arrays are based on addressable nano- or micrometric beads of various chemical natures (polymeric, silica, gold) and architectures (uniform composition, core-shell particles) to which NAs can be immobilized by means of activating chemistries similar to those described for fiat supports [64,65] depending on the composition of the particles outmost layer. 

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