In Situ STM Study of Potential-Driven Transitions in the Film of a Cationic Surfactant Adsorbed on a Au(111) Electrode Surface

Langmuir ◽  
2007 ◽  
Vol 23 (25) ◽  
pp. 12529-12534 ◽  
Author(s):  
Slawomir Sek ◽  
Maohui Chen ◽  
Christa L. Brosseau ◽  
Jacek Lipkowski
Keyword(s):  
Cationic Surfactant ◽  
Electrode Surface ◽  
In Situ Stm

In situ STM observation of morphological changes of the Pt(111) electrode surface during potential cycling in 10 mM HF solution

2010 ◽  
Vol 12 (16) ◽  
pp. 4184 ◽  
Author(s):  
Mitsuru Wakisaka ◽  
Shuichi Asizawa ◽  
Hiroyuki Uchida ◽  
Masahiro Watanabe
Keyword(s):  
Electrode Surface ◽  
Morphological Changes ◽  
Potential Cycling ◽  
In Situ Stm

scholarly journals Voltammetry and molecular assembly of G-quadruplex DNAzyme on single-crystal Au(111)-electrode surfaces – hemin as an electrochemical intercalator

2016 ◽  
Vol 193 ◽  
pp. 99-112 ◽  
Author(s):  
Ling Zhang ◽  
Jens Ulstrup ◽  
Jingdong Zhang
Keyword(s):  
Single Crystal ◽  
Single Molecule ◽  
Electrode Surface ◽  
Molecular Assembly ◽  
Electrode Surfaces ◽  
Potential Control ◽  
G Quadruplex ◽  
Tunnelling Microscopy ◽  
Dna Quadruplexes

DNA quadruplexes (qs) are a class of “non-canonical” oligonucleotides (OGNs) composed of stacked guanine (G) quartets stabilized by specific cations. Metal porphyrins selectively bind to G-qs complexes to form what is known as DNAzyme, which can exhibit peroxidase and other catalytic activity similar to heme group metalloenzymes. In the present study we investigate the electrochemical properties and the structure of DNAzyme monolayers on single-crystal Au(111)-electrode surfaces using cyclic voltammetry and scanning tunnelling microscopy under electrochemical potential control (in situ STM). The target DNAzyme is formed from a single-strand OGN with 12 guanines and iron(iii) porphyrin IX (hemin), and assembles on Au(111) through a mercapto alkyl linker. The DNAzyme monolayers exhibit a strong pair of redox peaks at 0.0 V (NHE) at pH 7 in acetate buffer, shifted positively by about 50 mV compared to free hemin weakly physisorbed on the Au(111)-electrode surface. The voltammetric hemin signal of DNAzyme is enhanced 15 times compared with that of hemin adsorbed directly on the Au(111)-electrode surface. This is indicative of both the formation of a close to dense DNAzyme monolayer and that hemin is strongly bound to the immobilized 12G-qs in well-defined orientation favorable for interfacial ET with a rate constant of 6.0 ± 0.4 s−1. This is supported by in situ STM which discloses single-molecule G-quartet structures with a size of 1.6 ± 0.2 nm.

In situ STM imaging of spontaneously deposited ruthenium on Au()

2002 ◽  
Vol 517 (1-3) ◽  
pp. 207-218 ◽  
Author(s):  
S Strbac ◽  
R.J Behm ◽  
A Crown ◽  
A Wieckowski
Keyword(s):  
In Situ Stm

Desorption of hydrogen from an electrode surface under influence of an external magnetic field – In-situ microscopic observations

2009 ◽  
Vol 11 (2) ◽  
pp. 425-429 ◽  
Author(s):  
Jakub Adam Koza ◽  
Sascha Mühlenhoff ◽  
Margitta Uhlemann ◽  
Kerstin Eckert ◽  
Annett Gebert ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Electrode Surface
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