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5991-3186EN Humidity-dependent Surface Chemistry Studied by 7500 Atomic Force Microscopy - Application Note c20141020 [2]


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Keysight Technologies
Humidity-dependent Surface Chemistry Studied
by Keysight 7500 Atomic Force Microscopy
Application Note



                                                  Introduction                                represents the calcite surface. In order
                                                                                              to demonstrate that the hydroxylation
                                                  One of the key advantages of atomic         reaction of calcite surfaces can be
                                                  force microscopy (AFM) over other           captured from an AFM point of view,
                                                  members within the microscopy family        a freshly cleaved CaCO 3 sample was
                                                  is its capability of being operated under   placed into the AFM chamber for a
                                                  different environments. Particularly,       certain period of time while the relative
                                                  a complete control of the relative          humidity inside was maintained at a
                                                  humidity (RH) in air surrounding the        preferable level. Then it was checked
                                                  localized tip/sample region is highly       by an AFM. Showing in Figure 1 is AFM
                 Topography                       desired for an AFM as it will render        topography of the resulting surface. In
                                                  users a valuable means to address           addition to those surface features such
                                                  a lot of humidity-dependent issues.         as the smooth domains and straight step
                                                  The Keysight Technologies, Inc.             edges that are intrinsic to the calcite
                                                  7500 AFM system is comprised of a           material, some newly formed protrusion
                                                  sealed environmental chamber with           islands are clearly resolved. Three
                                                  eight accessible ports and a build-in       selected examples are highlighted using
                                                  humidity senor, thus allowing the in situ   the dotted white circles. Such surface
                                                  monitoring and control of the RH during     morphologies are not observed on those
                                                  AFM measurements. In this application       calcite samples when they were imaged
                                                  brief, investigations of the inluence of    immediately after transferring into the
                                                  humidity on selected surface reactions      AFM chamber or the relative humidity
                                                  using Keysight 7500 AFM will                is very low. Therefore, AFM enables the
                                                  be presented.                               direct visualization and recognition of
Figure 1. AFM detection of calcite surface                                                    calcite surface changes.
reactions under controlled humidity conditions.
AFM topography of the resulting calcite surface   AFM Detection of
after hydroxylation reactions. Scan size:
                                                  Calcite Surface Reac-                       AFM-based Material
1.2



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