Sentence examples for the samples were observed using from inspiring English sources
The samples were observed using a CM12 (Philips) or Tecnai G2 Spirit BioTwin (FEI) microscope operating at 120 kV with an Orius SC1000B CCD camera (Gatan).
The samples were observed using a microscope.
The samples were observed using a scanning electron microscope (Philips XL30E, USA) (Williams and Davies 1967).
The ultraviolet visible absorption spectra of the samples were observed using a UV vis spectrophotometer.
The samples were observed using a FEG 2010 JEOL instrument, operated at 200 kV.
Surface morphologies of the samples were observed using SEM (ZEISS, SUPRATM-55) with accelerating voltage below 1 kV.
The surface morphology of the samples is observed using AFM.
The surface morphology of the samples was observed using FE-SEM.
The morphology of the samples was observed using a field-emission scanning electron microscope (FESEM) and Raman spectroscopy.
The morphology of the samples was observed using field emission scanning electron microscope (FESEM; S4800, Hitachi Corp., Chiyoda-ku, Japan).
The surface morphology of the samples was observed using scanning electron microscopy (SEM, Hitachi S-4800) (Additional file 1).
