THE DEPARTMENT OF                                                            AT STATE UNIVERSITY OF NEW YORK,  POTSDAM N.Y.


Site map


Professional activity



Nanoscience in Curriculum

University Service


Research with Students
Students List

Learning through research



International Connection

Raman Imaging and Spectroscopy Lab

Chemical and Biological Applications of Raman Spectroscopy (pdf, 7 MB)

Atomic Force Microscopy Lab

AFM operation

Tip interactions

Lectures to other Departments

Nanotechnology Lab


Quartz Crystal Nanobalance Lab

EQCN Principles

EQCN Setup



Electrochemical Quartz Crystal Nanobalance (EQCN) technique utilizes quartz vibrations and piezoelectric effect to measure mass changes as small as a fraction of a monolayer of atoms


Back to


Professor Maria Hepel

Atomic Force Microscopy Laboratory

Department of Chemistry

Stowell Hall

44 Pierrepont Ave.

Potsdam , NY 13676, U.S.A.

Tel.: +1.315.267.2267

Fax: +1.315.267.3170


AFM  Fundamentals


 Schematic of AFM principle of operation


    Light from a solid state laser is reflected from the AFM cantilever  and depending on the degree of its bending activates the lower or upper part of the dual diode photodetector.  The photodetector signal is amplified and transmitted to raise or lower the sample along z axis to as the bending of the tip is maintained.  The surface morphology of the sample is obtained by monitoring the vertical movement of the sample as a function of x,y position of the sample scanning in in XY plane.



Nanopores with 30 nm diameter formed by electrochemical processing in a TiO2 film Thermal TiO2 grown at 1123 K



The AFM/STM instrumentation has been funded by the NSF CCLI program, Award No. 0126402.


Atomic terraces

on a single crystal Ag

electrodeposited on Au(111)


Cantilever with tip