Formation and electric property measurement of nanosized patterns of tantalum oxide by current sensing atomic force microscope

2003 ◽  
Vol 94 (12) ◽  
pp. 7733 ◽  
Author(s):  
Young-ho Kim ◽  
Jianwei Zhao ◽  
Kohei Uosaki
Keyword(s):  
Atomic Force Microscope ◽  
Tantalum Oxide ◽  
Electric Property ◽  
Current Sensing ◽  
Atomic Force ◽  
Property Measurement

Electron Transport in Dodecylamine Capped Gold Nanocluster Films Using Current Sensing Atomic Force Microscope (C-AFM)

2009 ◽  
Vol 9 (9) ◽  
pp. 5467-5470
Author(s):  
Minakshi Chaudhary ◽  
Shirshendu Dey ◽  
Kalyani Date ◽  
S. B. Iyyer ◽  
C. V. Dharmadhikari
Keyword(s):  
Electron Transport ◽  
Atomic Force Microscope ◽  
Gold Nanocluster ◽  
Current Sensing ◽  
Atomic Force

scholarly journals Tunnelling Current Measurements Using Current Sensing Atomic Force Microscope

2020 ◽  
Vol 17 (Issue 1) ◽  
pp. 62-69
Author(s):  
Arup Sarkar ◽  
K. A. Suresh
Keyword(s):  
Atomic Force Microscope ◽  
Film Surface ◽  
Good Control ◽  
Physical Contact ◽  
Organic Films ◽  
Current Sensing ◽  
Precise Control ◽  
Langmuir Blodgett ◽  
Atomic Force ◽  
Tunnelling Current

To realise the miniaturised devices, the precise measurement of nanoscale tunnelling current in ultrathin films is of utmost importance. For the nanoscale current measurements, current sensing atomic force microscope (CSAFM) is one of the most powerful tool. CSAFM allows to map the current distribution on the film surface and it permits to perform current measurements as a function of applied bias voltage. It has turned out to be crucial for studies of organic films. In CSAFM, a physical contact is made on film with a precise control of the applied force in nanonewton (nN) range. For the preparation of ultrathin film, Langmuir-Blodgett (LB) technique is known to provide a uniform film with a good control over the thickness in the molecular level. In the last two decades, there have been many CSAFM studies for the tunnelling current measurements. This review is intended to cover the literature on the tunnelling current measurements using CSAFM.

Characterization of photosystem II with the atomic-force microscope

1992 ◽  
Vol 50 (2) ◽  
pp. 1146-1147
Author(s):  
Kathleen M. Marr ◽  
Mary K. Lyon
Keyword(s):  
Photosystem Ii ◽  
Atomic Force Microscope ◽  
Three Dimensional ◽  
Biologically Active ◽  
Atomic Force ◽  
Freeze Etching ◽  
Image Averaging ◽  
Oxygen Evolving ◽  
Averaging Techniques

Photosystem II (PSII) is different from all other reaction centers in that it splits water to evolve oxygen and hydrogen ions. This unique ability to evolve oxygen is partly due to three oxygen evolving polypeptides (OEPs) associated with the PSII complex. Freeze etching on grana derived insideout membranes revealed that the OEPs contribute to the observed tetrameric nature of the PSIl particle; when the OEPs are removed, a distinct dimer emerges. Thus, the surface of the PSII complex changes dramatically upon removal of these polypeptides. The atomic force microscope (AFM) is ideal for examining surface topography. The instrument provides a topographical view of individual PSII complexes, giving relatively high resolution three-dimensional information without image averaging techniques. In addition, the use of a fluid cell allows a biologically active sample to be maintained under fully hydrated and physiologically buffered conditions. The OEPs associated with PSII may be sequentially removed, thereby changing the surface of the complex by one polypeptide at a time.

Imaging polymers, proteins and dna in aqueous solutions with the atomic force microscope

1989 ◽  
Vol 47 ◽  
pp. 32-33
Author(s):  
S.A.C. Gould ◽  
B. Drake ◽  
C.B. Prater ◽  
A.L. Weisenhorn ◽  
S.M. Lindsay ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dna Sequencing ◽  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Piezoelectric Crystal ◽  
Atomic Force ◽  
Structure Of Molecules ◽  
Optical Lever

The atomic force microscope (AFM) is an instrument that can be used to image many samples of interest in biology and medicine. Images of polymerized amino acids, polyalanine and polyphenylalanine demonstrate the potential of the AFM for revealing the structure of molecules. Images of the protein fibrinogen which agree with TEM images demonstrate that the AFM can provide topographical data on larger molecules. Finally, images of DNA suggest the AFM may soon provide an easier and faster technique for DNA sequencing.The AFM consists of a microfabricated SiO2 triangular shaped cantilever with a diamond tip affixed at the elbow to act as a probe. The sample is mounted on a electronically driven piezoelectric crystal. It is then placed in contact with the tip and scanned. The topography of the surface causes minute deflections in the 100 μm long cantilever which are detected using an optical lever.

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