scholarly journals Conducting polymers as electron glasses: surface charge domains and slow relaxation

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Miguel Ortuño ◽  
Elisa Escasain ◽  
Elena Lopez-Elvira ◽  
Andres M. Somoza ◽  
Jaime Colchero ◽  
...  
Keyword(s):  
Conducting Polymers ◽  
Surface Charge ◽  
Slow Relaxation

PNA versus DNA in electrochemical gene sensing based on conducting polymers: study of charge and surface blocking effects on the sensor signal

The Analyst ◽  
2018 ◽  
Vol 143 (3) ◽  
pp. 687-694 ◽  
Author(s):  
Bicheng Zhu ◽  
Jadranka Travas-Sejdic
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Conducting Polymers ◽  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Electrochemical Impedance ◽  
Dna Sensor ◽  
Sensor Signal ◽  
Blocking Effects

In this communication, we highlight the effect of the surface charge and surface charge density on the DNA/DNA, DNA/PNA and PNA/PNA hybridisations of a polypyrrole-based DNA sensor, measured by means of electrochemical impedance spectroscopy (EIS).

Slow relaxation in conducting polymers: influence of the wait potential

1993 ◽  
Vol 55 (2-3) ◽  
pp. 1287-1292 ◽  
Author(s):  
C. Odin ◽  
M. Nechtschein
Keyword(s):  
Conducting Polymers ◽  
Slow Relaxation

Slow relaxation in conducting polymers

1991 ◽  
Vol 67 (9) ◽  
pp. 1114-1117 ◽  
Author(s):  
C. Odin ◽  
M. Nechtschein
Keyword(s):  
Conducting Polymers ◽  
Slow Relaxation

Imaging molecules adsorbed onto electrodes under potential control by scanning probe microscopy

1991 ◽  
Vol 49 ◽  
pp. 376-377 ◽  
Author(s):  
N.J. Tao ◽  
J.A. DeRose ◽  
P.I. Oden ◽  
S.M. Lindsay
Keyword(s):  
Surface Charge ◽  
Environmental Effects ◽  
Scanning Probe Microscopy ◽  
Statistical Significance ◽  
Electrochemical Methods ◽  
Surface Structures ◽  
Scanning Probe ◽  
Potential Control ◽  
Afm Imaging ◽  
Special Circumstances

Clemmer and Beebe have pointed out that surface structures on graphite substrates can be misinterpreted as biopolymer images in STM experiments. We have been using electrochemical methods to react DNA fragments onto gold electrodes for STM and AFM imaging. The adsorbates produced in this way are only homogeneous in special circumstances. Searching an inhomogeneous substrate for ‘desired’ images limits the value of the data. Here, we report on a reversible method for imaging adsorbates. The molecules can be lifted onto and off the substrate during imaging. This leaves no doubt about the validity or statistical significance of the images. Furthermore, environmental effects (such as changes in electrolyte or surface charge) can be investigated easily.

Electronic structure studies of conducting polymers by electron energy-loss spectroscopy

1996 ◽  
Vol 54 ◽  
pp. 160-161
Author(s):  
J. Fink
Keyword(s):  
Electronic Structure ◽  
Conducting Polymers ◽  
Conjugated Polymers ◽  
Electron Acceptors ◽  
Electron Donors ◽  
Light Emitting ◽  
One Dimensional ◽  
New Class ◽  
Electrical Conductivities ◽  
Electron Energy Loss

Conducting polymers comprises a new class of materials achieving electrical conductivities which rival those of the best metals. The parent compounds (conjugated polymers) are quasi-one-dimensional semiconductors. These polymers can be doped by electron acceptors or electron donors. The prototype of these materials is polyacetylene (PA). There are various other conjugated polymers such as polyparaphenylene, polyphenylenevinylene, polypoyrrole or polythiophene. The doped systems, i.e. the conducting polymers, have intersting potential technological applications such as replacement of conventional metals in electronic shielding and antistatic equipment, rechargable batteries, and flexible light emitting diodes.Although these systems have been investigated almost 20 years, the electronic structure of the doped metallic systems is not clear and even the reason for the gap in undoped semiconducting systems is under discussion.

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