نتایج جستجو برای: scanning tunneling microscope

تعداد نتایج: 203968  

Journal: :Nanotechnology 2011
Woochul Lee Pramod Reddy

The scanning tunneling microscope break junction (STMBJ) technique is a powerful approach for creating single-molecule junctions and studying electrical transport in them. However, junctions created using the STMBJ technique are usually mechanically stable for relatively short times (<1 s), impeding detailed studies of their charge transport characteristics. Here, we report a custom-designed sc...

2006
Violeta Iancu Aparna Deshpande Saw-Wai Hla

We report manipulation of a Kondo resonance originated from the spin-electron interactions between a twodimensional molecular assembly of TBrPP-Co molecules and a Cu(111) surface at 4.6 K using a low temperature scanning tunneling microscope. By manipulating nearest-neighbor molecules with a scanning tunneling microscope tip we are able to tune the spin-electron coupling of the center molecule ...

Journal: :Journal of synchrotron radiation 2006
Akira Saito Junpei Maruyama Ken Manabe Katsuyuki Kitamoto Koji Takahashi Kazuhiro Takami Makina Yabashi Yoshihito Tanaka Daigo Miwa Masashi Ishii Yasumasa Takagi Megumi Akai-Kasaya Shik Shin Tetsuya Ishikawa Yuji Kuwahara Masakazu Aono

A scanning tunneling microscope dedicated to in situ experiments under the irradiation of highly brilliant hard-X-rays of synchrotron radiation has been developed. In situ scanning tunneling microscopy (STM) observation was enabled by developing an accurate alignment system in ultrahigh vacuum. Despite the noisy conditions of the synchrotron radiation facility and the radiation load around the ...

M. Zeraatkar R. Bazargan Lari S. Sabbaghi

Nano films consisting of an alternating sequence of positively and negatively charged polyelectrolytes have been prepared by means of the electrostatic layer-by-layer (LBL) sequential assembly technique on treated and untreated mild steel wires. Inhibitor was encapsulated between cationic and anionic polyelectrolyte nano films. This paper mainly focuses on the effect of these nano-films of poly...

Journal: :Physical chemistry chemical physics : PCCP 2006
O Shekhah C Busse A Bashir F Turcu X Yin P Cyganik A Birkner W Schuhmann Ch Wöll

Palladium islands with a thickness of a few monolayers were deposited on top of a self-assembled monolayer (SAM) fabricated from 4-mercaptopyridine. In the I(V) curves obtained using the scanning tunneling microscope (STM) clearly the signature of Coulomb blockade is observed, explicitly demonstrating that these islands are coupled to the underlying gold substrate only via a tunneling barrier; ...

Journal: :Physical review letters 1993
Feenstra Woodall Pettit

The scanning tunneling microscope is used to study arsenic-related point defects in low-temperaturegrown GaAs. Tunneling spectroscopy reveals a band of donor states located near E„+0. 5 eV arising from the defects. Images of this state reveal a central defect core, with two satellites located about 15 A from the core. The structure of the defect is found to be consistent with that of an isolate...

Journal: :Physical review letters 2009
Daniel Wegner Ryan Yamachika Xiaowei Zhang Yayu Wang Tunna Baruah Mark R Pederson Bart M Bartlett Jeffrey R Long Michael F Crommie

We have fabricated hybrid magnetic complexes from V atoms and tetracyanoethylene ligands via atomic manipulation with a cryogenic scanning tunneling microscope. Using tunneling spectroscopy we observe spin-polarized molecular orbitals as well as Kondo behavior. For complexes having two V atoms, the Kondo behavior can be quenched for different molecular arrangements, even as the spin-polarized o...

Journal: :Science 2004
Joseph A Stroscio Robert J Celotta

We studied the dynamics of a single cobalt (Co) atom during lateral manipulation on a copper (111) surface in a low-temperature scanning tunneling microscope. The Co binding site locations were revealed in a detailed image that resulted from lateral Co atom motion within the trapping potential of the scanning tip. Random telegraph noise, corresponding to the Co atom switching between hexagonal ...

2007
John Lund Ranjana Mehta Maryam Rahimi Babak A. Parviz

We report an electronic method that has the capacity to directly read bases without any chemical manipulation or labeling of DNA. Our method consists of stretching DNA on a conductive substrate which can then be analyzed using inelastic electron tunneling spectroscopy (IETS). We have developed techniques to stretch DNA molecules on conductive substrates and have experimentally validated our met...

Journal: :Nano letters 2008
C Silien N Liu W Ho J B Maddox S Mukamel B Liu G C Bazan

Single 4,7,12,15-tetrakis(4'-dimethylaminostyryl)[2.2]paracyclophane molecules adsorb on NiAl(110) in different configurations. When the symmetry axes of the molecules are properly oriented with respect to the surface lattice, three adsorbate states of different conductance can be reversibly induced and directly imaged with a scanning tunneling microscope. Couplings between tunneling electrons ...

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