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XPS is not really surface sensitive since the mean-free-path of the electrons is on the order of 1 nm. For a material with 50 m2/g surface area, a very large fraction of the bulk is within 1 nm of the surface.It is not really clear that one learns anything from this.¶ÔÓÚÕâ¶Î»°¸ÃÔõôÑùÀí½â£¬Çó´óÉñÖ¸µã¡£
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