Experimental and fitted Raman spectrum and volume fraction of grain boundaries and hydrogen content. (a) Experimental (open circles) and fitted (solid curve) Raman spectrum of a representative sample with RH = 98.2%. (b) Volume fraction of grain boundaries and hydrogen content as a function of RH.
Wen et al. Nanoscale Research Letters 2014 9:303 doi:10.1186/1556-276X-9-303