ΗΛΕΚΡΟΝΙΚΗ ΜΙΚΡΟΣΚΟΠΙΑ

.

FORTH / IESL / TCM

@ Vassilios Binas

Crete Center for Quantum Complexity and

Nanotechnology

Department of Physics, University of Crete

Transparent Conductive Materials (Head prof. G. Kiriakidis)

Institute of Electronic Structure & Laser IESL

Foundation for Research and Technology - FORTH

Post Doc Researcher, Chemist

, Email: [email protected]

Thl. 1269

~ 1700

1942

Scanning Electron Microscopy (SEM)

1931

Transmition Electron Microscopy (TEM)

1981

Scanning Tunneling Microscopy (STM)

1986

Atomic Force Microscopy (AFM)

FORTH / IESL / TCM

@ Vassilios Binas

ATOMIC FORCE MICROSCOPY (AFM)

Scanning Tunneling Microscopy (STM)

Atomic Force Microscopy (AFM)

3

AFM

1.000.000

FORTH / IESL / TCM

@ Vassilios Binas

SCANNING PROBE MICROSCOPY (SPM)

Scanning Tunneling Microscope (STM)

Atomic Force Microscope (AFM)

, -277 FORTH / IESL / TCM @ Vassilios Binas

STM

AFM

LFM

.

MFM

4.

5.

1.

2.

3.

SPM



STM AFM



SCANNING TUNNELING MICROSCOPY (STM)

STM

Source: http://mrsec.wisc.edu/Edetc/modules/MiddleSchool/SPM/MappingtheUnknown.pdf

- electron tunneling current



Source: http://mrsec.wisc.edu/Edetc/modules/MiddleSchool/SPM/MappingtheUnknown.pdf

Tunneling current

STM



Source: http://www.chem.qmw.ac.uk/surfaces/scc/scat7_6.htm

x 106

x 108

x 108

e-



Source: http://www.chem.qmw.ac.uk/surfaces/scc/scat7_6.htm

(Vibrational interference) ( )

& ( )



1. Laser

2. (cantilever)

3.

4.

5.

6. Scanner with sample



19

Contact mode

Non Contact mode

Lateral Force Microscopy

Tapping mode



20

Contact mode

Non Contact mode



&

Van der Waals



25-300m

10-30 m

0.5-3 m

Si Si3N4

(. )



( )

( )



Laser &

.

laser

(

)



Laser &

.

z.

?



;



.

.

x,y

.



.

( ).

.

.

.

10 ~ 100 64 ~ 512 points/line



1)

2)

3)

4)

5) DVD

6)

7)

..



1)

Carbon

Nanotubes GaAs



2)



3)

AFM



4)

.



5) DVD



6)

35 , -277 FORTH / IESL / TCM @ Vassilios Binas


7)

, , , ,

DNA


38

SO WHAT DO WE SEE?

Sources: http://www.almaden.ibm.com/vis/stm/blue.html

http://www.asylumresearch.com/ImageGallery/Mat/Mat.shtml#M7

Nickel from an STM ZnO from an AFM


39

Xenon atoms

Carbon monoxide molecules

Source: http://www.almaden.ibm.com/vis/stm/atomo.html

AND WHAT CAN WE

DO?

Using STMs and AFMs in Nanoscience

Allows atom by atom (or clumps of atoms by clumps of atoms) manipulation as shown by the images below



(.. )

( )



(mm x mm)

( )

. .

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