Field-effect sensors for monitoring the layer-by-layer adsorption of charged macromolecules

2006 ◽  
Vol 118 (1-2) ◽  
pp. 163-170 ◽  
Author(s):  
A. Poghossian ◽  
M.H. Abouzar ◽  
M. Sakkari ◽  
T. Kassab ◽  
Y. Han ◽  
...  
Keyword(s):  
Field Effect ◽  
Layer By Layer ◽  
Layer Adsorption ◽  
Charged Macromolecules

Towards Label-free Detection of Charged Macromolecules Using Field-effect-based Structures: Scaling Down from Capacitive EIS Sensor over ISFET to Nano-scale Devices

2006 ◽  
Vol 915 ◽  
Author(s):  
Michael J. Schoening ◽  
Maryam H. Abouzar ◽  
Sven Ingebrandt ◽  
Johannes Platen ◽  
Andreas Offenhaeusser ◽  
...  
Keyword(s):  
Field Effect ◽  
Deep Understanding ◽  
Layer By Layer ◽  
Label Free ◽  
New Approach ◽  
Charged Surfaces ◽  
Physiological Processes ◽  
Layer Adsorption ◽  
Label Free Detection ◽  
Charged Macromolecules

AbstractThe possibility of a label-free electrical detection of charged macromolecules using semiconductor field-effect sensors offers a new approach for the development of DNA chips with fast and direct electrical readout. A deep understanding of the adsorption and interaction of charged biomolecules onto charged surfaces is of great interest also for the fundamental understanding of many key physiological processes. In the present work, two types of field-effect sensors, namely a capacitive EIS (electrolyte-insulator-semiconductor) structure and an ISFET (ion-sensitive field-effect transistor) have been utilised for monitoring layer-by-layer adsorption of polyelectrolytes as well as for the DNA immobilisation and hybridisation detection.

scholarly journals Capacitive Field-effect (bio-)chemical Sensors Based on Nanocrystalline Diamond Films

2009 ◽  
Vol 1203 ◽  
Author(s):  
Matthias Bäcker ◽  
Arshak Poghossian ◽  
Maryam H. Abouzar ◽  
Sylvia Wenmackers ◽  
Stoffel D. Janssens ◽  
...  
Keyword(s):  
Thin Films ◽  
Field Effect ◽  
High Sensitivity ◽  
Ph Sensitive ◽  
Nanocrystalline Diamond ◽  
Penicillin G ◽  
Layer By Layer ◽  
Label Free ◽  
High Coverage ◽  
Layer Adsorption

AbstractCapacitive field-effect electrolyte-diamond-insulator-semiconductor (EDIS) structures with O-terminated nanocrystalline diamond (NCD) as sensitive gate material have been realized and investigated for the detection of pH, penicillin concentration, and layer-by-layer adsorption of polyelectrolytes. The surface oxidizing procedure of NCD thin films as well as the seeding and NCD growth process on a Si-SiO2 substrate have been improved to provide high pH-sensitive, non-porous thin films without damage of the underlying SiO2 layer and with a high coverage of O-terminated sites. The NCD surface topography, roughness, and coverage of the surface groups have been characterized by SEM, AFM and XPS methods. The EDIS sensors with O-terminated NCD film treated in oxidizing boiling mixture for 45 min show a pH sensitivity of about 50 mV/pH. The pH-sensitive properties of the NCD have been used to develop an EDIS-based penicillin biosensor with high sensitivity (65-70 mV/decade in the concentration range of 0.25-2.5 mM penicillin G) and low detection limit (5 μM). The results of label-free electrical detection of layer-by-layer adsorption of charged polyelectrolytes are presented, too.

A Facile Layer-by-Layer Adsorption and Reaction Method to the Preparation of Titanium Phosphate Ultrathin Films

2005 ◽  
Vol 17 (13) ◽  
pp. 3563-3569 ◽  
Author(s):  
Qifeng Wang ◽  
Ling Zhong ◽  
Junqi Sun ◽  
Jiacong Shen
Keyword(s):  
Ultrathin Films ◽  
Titanium Phosphate ◽  
Layer By Layer ◽  
Reaction Method ◽  
Layer Adsorption

Amperometric glucose biosensor by means of electrostatic layer-by-layer adsorption onto polyaniline-coated polyester films

2010 ◽  
Vol 16 (3) ◽  
pp. 380-384 ◽  
Author(s):  
Young Jae Shin ◽  
Sun Hee Kim ◽  
Do Hyeon Yang ◽  
Hyoshik Kwon ◽  
Jae Sup Shin
Keyword(s):  
Glucose Biosensor ◽  
Layer By Layer ◽  
Layer Adsorption

Coating of Polyaniline Molecules on Cotton Fabric via Successive Ionic Layer Adsorption and Reaction (SILAR) Technique

2018 ◽  
Vol 775 ◽  
pp. 317-322
Author(s):  
John Raphael D. Barrios ◽  
Marvin U. Herrera
Keyword(s):  
Infrared Spectrum ◽  
Cotton Fabric ◽  
Surface Conductivity ◽  
Optimum Number ◽  
Layer By Layer ◽  
Layer Deposition ◽  
Layer Adsorption ◽  
Silar Technique ◽  
Probe Measurements ◽  
Ionic Layer

Cotton fabric was coated with polyaniline molecules using Successive Ionic Layer Adsorption and Reaction (SILAR) technique. This method provides layer by layer deposition of polyaniline molecules. Infrared spectrum showed the vibrational peaks attributed with the presence of polyaniline molecules on the samples. Four-point probe measurements were done to obtain the surface conductivity of the samples. Upon increasing the dipping cycles, the conductivity of cotton fabric significantly increases. The optimum number of dipping cycle is found to be at 130. Beyond the optimum dipping cycle, the conductivity starts to decrease.

Assembly of Alternating Polycation and DNA Multilayer Films by Electrostatic Layer-by-Layer Adsorption

2001 ◽  
Vol 2 (2) ◽  
pp. 463-468 ◽  
Author(s):  
Renjun Pei ◽  
Xiaoqiang Cui ◽  
Xiurong Yang ◽  
Erkang Wang
Keyword(s):  
Multilayer Films ◽  
Layer By Layer ◽  
Layer Adsorption
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