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. 2009 May 11;9(5):3469–3490. doi: 10.3390/s90503469

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© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 2. — AFM images of: (a) up-to-APTES, (b) up-to-GA, (c) fully processed (with GOx), and (d) fully processed (with GOx) without the first step (NO SSC step). The vertical scale is 10 nm while the horizontal scales are both 1 μm. Higher peaks appear lighter on a gray scale.