xrd case study: cds nano-rods · xrd case study: cds nano-rods y 20 40 60 80 100 2-theta (degrees)...
TRANSCRIPT
XRD Case Study: CdS Nano-rods
Inte
nsity
100806040202-theta (degrees)
CdS "Greenockite"
Inte
nsity
323028262422202-theta (degrees)
100
002
101
FWHM=1.87
FWHM=0.41 => 24.1 nm
=> 5.3 nm
Peak positions match hexagonal CdS phase “Greenockite”
Requires only a few milligrams of sample
INSET: Analysis of linewidths using the Scherrer equation gives particle dimensions consistent with TEM, and shows crystallographic axis of rod growth.
Non-uniform diffraction rings imply orientation of crystals. This also manifests in relative
peak intensities.