I'm assuming you're talking about XRD reflection maxima?
Was it the same starting material from the same batch each time? Batch-to-Batch variations are, unfortunately, not rare with carbon stuff and it may be a tedious tasks to find out which suppliers are good for reproducible scientific work and which aren't.
Adding to the starting material: have you done XRD on that, as well? Was it the same?
The XRD peak position for graphene oxide is primarily influenced by the interlayer spacing between the sheets.
When samples are from the same batch, variations in peak positions can be due to uneven sheet distribution, structural heterogeneity, or preferred orientation during sample mounting, all of which impact the interlayer spacing.
For samples from different synthesized batches, factors like degree of oxidation, intercalated species, exfoliation, and structural defects can also cause peak shifts by altering the spacing.
To improve reliability, ensure homogeneous sample dispersion, prepare multiple samples, and verify XRD instrument alignment. These steps help identify the source of discrepancies in the observed XRD peak positions.
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