Scanning tunnelling spectroscopy on the local electronic structure of Gd@C82 peapods

2010 ◽  
Vol 247 (11-12) ◽  
pp. 3030-3032 ◽  
Author(s):  
Kazunori Ohashi ◽  
Naoki Imazu ◽  
Ryo Kitaura ◽  
Hisanori Shinohara
Keyword(s):  
Electronic Structure ◽  
Scanning Tunnelling ◽  
Local Electronic Structure ◽  
Scanning Tunnelling Spectroscopy

scholarly journals Mapping the Electronic Structure of Polypyrrole with Image-Based Electrochemical Scanning Tunnelling Spectroscopy

2020 ◽  
Author(s):  
Roger Goncalves ◽  
Robert S. Paiva ◽  
Andres M R Ramirez ◽  
Jonathan A Mwanda ◽  
Ernesto C. Pereira ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Electrochemical Impedance ◽  
Wide Range ◽  
Scanning Tunnelling ◽  
Potential Scale ◽  
Electrochemically Deposited ◽  
Interfacial Capacitance ◽  
The Absolute ◽  
Absolute Potential ◽  
Scanning Tunnelling Spectroscopy

Conducting polymers are versatile semiconductors whose applications cover a wide range of devices. Their versatility is due, in addition to other factors, to properties that can be easily modulated according to the intended application. It is therefore important to study and map the electronic structure of these materials to allow for a better correlation between structure and properties. Electrochemical scanning tunnelling spectroscopy (EC-STS) can be a powerful tool to characterize the electronic structure of the semiconductor electrolyte interface. In this work we have used image-based EC-STS (IB-EC-STS) to describe quantitatively the band structure of an electrochemically deposited polypyrrole (PPy) film. IB-EC-STS located the band edge of the polymer’s valence band (VB) at 0.95 V vs. RHE (-5.33 eV in the absolute potential scale) and the intragap polaron states formed when the polymer is oxidised (doped) at 0.46 V vs. RHE (-4.84 eV in the absolute potential scale). The IB-EC-STS data were cross checked with electrochemical impedance spectroscopy (EIS) and Mott-Schottky analysis of the interfacial capacitance. The DOS spectrum obtained from EIS data is consistent with the STS-deduced location of the VB and the polarons.

scholarly journals Mapping the Electronic Structure of Polypyrrole with Image-Based Electrochemical Scanning Tunnelling Spectroscopy

2020 ◽  
Author(s):  
Roger Goncalves ◽  
Robert S. Paiva ◽  
Andres M R Ramirez ◽  
Jonathan A Mwanda ◽  
Ernesto C. Pereira ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Electrochemical Impedance ◽  
Wide Range ◽  
Scanning Tunnelling ◽  
Potential Scale ◽  
Electrochemically Deposited ◽  
Interfacial Capacitance ◽  
The Absolute ◽  
Absolute Potential ◽  
Scanning Tunnelling Spectroscopy

Conducting polymers are versatile semiconductors whose applications cover a wide range of devices. Their versatility is due, in addition to other factors, to properties that can be easily modulated according to the intended application. It is therefore important to study and map the electronic structure of these materials to allow for a better correlation between structure and properties. Electrochemical scanning tunnelling spectroscopy (EC-STS) can be a powerful tool to characterize the electronic structure of the semiconductor electrolyte interface. In this work we have used image-based EC-STS (IB-EC-STS) to describe quantitatively the band structure of an electrochemically deposited polypyrrole (PPy) film. IB-EC-STS located the band edge of the polymer’s valence band (VB) at 0.95 V vs. RHE (-5.33 eV in the absolute potential scale) and the intragap polaron states formed when the polymer is oxidised (doped) at 0.46 V vs. RHE (-4.84 eV in the absolute potential scale). The IB-EC-STS data were cross checked with electrochemical impedance spectroscopy (EIS) and Mott-Schottky analysis of the interfacial capacitance. The DOS spectrum obtained from EIS data is consistent with the STS-deduced location of the VB and the polarons.

scholarly journals Mapping the Electronic Structure of Polypyrrole with Image-Based Electrochemical Scanning Tunnelling Spectroscopy

2020 ◽  
Author(s):  
Roger Goncalves ◽  
Robert S. Paiva ◽  
Andres M R Ramirez ◽  
Jonathan A Mwanda ◽  
Ernesto C. Pereira ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Electrochemical Impedance ◽  
Wide Range ◽  
Scanning Tunnelling ◽  
Potential Scale ◽  
Electrochemically Deposited ◽  
Interfacial Capacitance ◽  
The Absolute ◽  
Absolute Potential ◽  
Scanning Tunnelling Spectroscopy

Conducting polymers are versatile semiconductors whose applications cover a wide range of devices. Their versatility is due, in addition to other factors, to properties that can be easily modulated according to the intended application. It is therefore important to study and map the electronic structure of these materials to allow for a better correlation between structure and properties. Electrochemical scanning tunnelling spectroscopy (EC-STS) can be a powerful tool to characterize the electronic structure of the semiconductor electrolyte interface. In this work we have used image-based EC-STS (IB-EC-STS) to describe quantitatively the band structure of an electrochemically deposited polypyrrole (PPy) film. IB-EC-STS located the band edge of the polymer’s valence band (VB) at 0.95 V vs. RHE (-5.33 eV in the absolute potential scale) and the intragap polaron states formed when the polymer is oxidised (doped) at 0.46 V vs. RHE (-4.84 eV in the absolute potential scale). The IB-EC-STS data were cross checked with electrochemical impedance spectroscopy (EIS) and Mott-Schottky analysis of the interfacial capacitance. The DOS spectrum obtained from EIS data is consistent with the STS-deduced location of the VB and the polarons.

scholarly journals Electronic structure of single DNA molecules resolved by transverse scanning tunnelling spectroscopy

2007 ◽  
Vol 7 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Errez Shapir ◽  
Hezy Cohen ◽  
Arrigo Calzolari ◽  
Carlo Cavazzoni ◽  
Dmitry A. Ryndyk ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Dna Molecules ◽  
Single Dna Molecules ◽  
Scanning Tunnelling ◽  
Scanning Tunnelling Spectroscopy

EELS Measurement of the Local Electronic Structure of Copper Atoms Segregated to Aluminum Grain Boundaries

1996 ◽  
Vol 54 ◽  
pp. 342-343
Author(s):  
S.J. Splinter ◽  
J. Bruley ◽  
P.E. Batson ◽  
D.A. Smith ◽  
R. Rosenberg
Keyword(s):  
Electronic Structure ◽  
Grain Boundaries ◽  
Boundary Segregation ◽  
Thin Layers ◽  
Nominal Composition ◽  
Spatially Resolved ◽  
Service Lifetime ◽  
Heat Treated ◽  
Probe Size ◽  
Local Electronic Structure

It has long been known that the addition of Cu to Al interconnects improves the resistance to electromigration failure. It is generally accepted that this improvement is the result of Cu segregation to Al grain boundaries. The exact mechanism by which segregated Cu increases service lifetime is not understood, although it has been suggested that the formation of thin layers of θ-CuA12 (or some metastable substoichiometric precursor, θ’ or θ”) at the boundaries may be necessary. This paper reports measurements of the local electronic structure of Cu atoms segregated to Al grain boundaries using spatially resolved EELS in a UHV STEM. It is shown that segregated Cu exists in a chemical environment similar to that of Cu atoms in bulk θ-phase precipitates.Films of 100 nm thickness and nominal composition Al-2.5wt%Cu were deposited by sputtering from alloy targets onto NaCl substrates. The samples were solution heat treated at 748K for 30 min and aged at 523K for 4 h to promote equilibrium grain boundary segregation. EELS measurements were made using a Gatan 666 PEELS spectrometer interfaced to a VG HB501 STEM operating at 100 keV. The probe size was estimated to be 1 nm FWHM. Grain boundaries with the narrowest projected width were chosen for analysis. EDX measurements of Cu segregation were made using a VG HB603 STEM.

A novel ligand with –NH2 and –COOH-decorated Co/Fe-based oxide for an efficient overall water splitting: dual modulation roles of active sites and local electronic structure

2020 ◽  
Vol 10 (18) ◽  
pp. 6266-6273
Author(s):  
Yalan Zhang ◽  
Zebin Yu ◽  
Ronghua Jiang ◽  
Jung Huang ◽  
Yanping Hou ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Water Splitting ◽  
Energy Demand ◽  
Active Sites ◽  
Electrode Materials ◽  
Global Energy ◽  
Overall Water Splitting ◽  
Local Electronic Structure ◽  
Electrochemical Water Splitting

Excellent electrochemical water splitting with remarkable durability can provide a solution to satisfy the increasing global energy demand in which the electrode materials play an important role.

Single-charge transport through hybrid core–shell Au-ZnS quantum dots: a comprehensive analysis from a modified energy structure

Nanoscale ◽  
2021 ◽  
Author(s):  
Tuhin Shuvra Basu ◽  
Simon Diesch ◽  
Ryoma Hayakawa ◽  
Yutaka Wakayama ◽  
Elke Scheer
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Carrier Transport ◽  
Comprehensive Analysis ◽  
Energy Structure ◽  
Core Shell ◽  
Single Charge ◽  
Scanning Tunnelling Microscope ◽  
Single Carrier ◽  
Scanning Tunnelling

We examined the modified electronic structure and single-carrier transport of individual hybrid core–shell metal–semiconductor Au-ZnS quantum dots using a scanning tunnelling microscope.

Local Electronic Structure of Olivine Phases of LixFePO4

2007 ◽  
Vol 111 (20) ◽  
pp. 4242-4247 ◽  
Author(s):  
Shu Miao ◽  
Michael Kocher ◽  
Peter Rez ◽  
Brent Fultz ◽  
Rachid Yazami ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Local Electronic Structure
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