Your report will address AFM methods you have seen, each procedure with visual (picture ) examples, and the comparison of size measurements for QD between AFM and one of other methods: absorption emission, DLS, etc  .For DLS see experiment , for Absorption see textbook Experiment 45 and the empirical formula for radius.

0) Lecture before experiment         2a     2b

1)  Absorption and luminescence spectra of QD (CdSe/ZnS)  Calculation

2) Experiment 6 (AFM-STM) -web site support

3) Force measurements

4) Fall 2001 AFM  

Pictures PPT  QD  1 2 3 4 5 6

  CVD PEG 1 2  3 4 5       NG NS Thiol:  1  2

 5)How to download Gwyddion / MS Windows

 Data analysis using Gwyddion + FFT and autocorrelation      

   http://gwyddion.net/

You will probably need to install Gtk+ runtime environment prior to Gwyddion installation. We recommend GladeWin32 Gtk+ runtime environment.

Note you don't need to install Gwyddion-Development to just use Gwyddion.

WHAT TO DO:

File _> Open (choose you file from the data above

Meta_> Show Data Browser ( choose channels: topography, amplitude, phase..

You can find the sizes from (topography file)

Tools -> Extract profile (icon ) Note: this one can be in nm.

Distances:

Tools-> Measure distances

--- Filtering

Data Process-> Correct Data-> 1D (or2D) FFT Filtering  (Choose domains you want to test in the inverse FFT space, check the shapes in the resultant graph)

ETC.

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old material:

Monday is AFM lab, !:40PM sharp. Go to the basement of Chem department Choppin hall -big doors near freight elevator.  -                      See Experiment 6. Download Gwyddion on your computer (free see instructions) for AFM imaging and visualization. The work in AFM lab demands patience - take notes and spend time usefully writing and thinking about the work. The AFM project will have a PPT presentation part.

(AFM results 08 spring and AFM results fall 08 1 2 3, last semester: AFM Results spring 09 (very good!) and results fall 09 Procedure: 1 INTRODUCTION : 2)

 raw files (2010) 1 2 3 4 5  6

raw files 2011 CdSe NC: 1 2 3 4 5 6  7 ppt   Absorption & Fluorescence (material for AFM report)

data 2010

talk        freqspec

800        800phase

      600       600 phase

   400   400 phase

  300   300phase

   200   200 phase

 1500       1500 phase

raw files (2010) 1 2 3 4 5  6

raw files 2011 CdSe NC: 1 2 3 4 5 6  7 ppt   Absorption & Fluorescence (material for AFM report)

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Dates: .... and ....... AFM experiment - Choppin basement B-1, sharp 1:40PM, reports due on Monday,  ..........

pictures from the AFM lab (2009)

Last year (2009) research:

group1-day 1

group 2-day 1

day 2  nanolithography 1 2

2 3   tip  2

Photos: 1 2 3 4 5 6 7 8 9

afmforce

pegsilan

From spring 2008: Experiment -read this before class