High-Frequency Impedance Analysis of Quartz Crystal Microbalances. 2. Electrochemical Deposition and Redox Switching of Conducting Polymers

1994 ◽  
Vol 66 (18) ◽  
pp. 2926-2934 ◽  
Author(s):  
Patrice A. Topart ◽  
Marc A. M. Noel
Keyword(s):  
Conducting Polymers ◽  
Electrochemical Deposition ◽  
High Frequency ◽  
Quartz Crystal ◽  
Impedance Analysis ◽  
Quartz Crystal Microbalances ◽  
Redox Switching

scholarly journals Immobilization of DNA probes on a high frequency piezoelectric biosensor

DYNA ◽  
2020 ◽  
Vol 87 (212) ◽  
pp. 163-168
Author(s):  
Camilo Ortiz Monsalve ◽  
Jorge Mario Guerra González ◽  
Marisol Jaramillo Grajales
Keyword(s):  
Real Time ◽  
High Frequency ◽  
Quartz Crystal ◽  
Low Cost ◽  
Fast Response ◽  
Dna Probes ◽  
Self Assembled Monolayers ◽  
Saturation Point ◽  
Assembled Monolayers ◽  
Quartz Crystal Microbalances

In recent years, researchers have taken to biosensors as effective tools for detection due to their portability, low-cost, fast response, and practicality. Piezoelectricity gave way to quartz crystal microbalances (QCM), of which high-frequency QCMs (HFF-QCM 100MHz) are still being researched. In this paper, we use DNA immobilization on a HFF-QCM via self-assembled monolayers (SAM) technique. Immobilization was initially verified with ATR-FTIR. Then, DNA was immobilized in real time on the HFF-QCM crystals. A variation in the phase of the signal suggests fixation of DNA to the surface, in accordance with ATR-FTIR results. A density of 629 ng/cm2 was computed. Also, a positive correlation between immobilized DNA and DNA concentration, and the appearance of a saturation point between 1 and 5 μM were shown after analysis of different DNA concentrations.

EQCM and Quartz Crystal Impedance Measurements for the Characterization of Thiophene-Based Conducting Polymers

1999 ◽  
Vol 600 ◽  
Author(s):  
C. Arbizzani ◽  
F. Soavi ◽  
M. Mastragostino
Keyword(s):  
Conducting Polymers ◽  
Polymer Films ◽  
Quartz Crystal ◽  
Impedance Analysis ◽  
Frequency Change ◽  
Impedance Measurements ◽  
Electronically Conducting Polymers ◽  
Frequency Response Analyzer ◽  
Conducting Polymer Films

AbstractEQCM was extensively used to investigate ion-transport phenomena during dopingundoping processes of electronically conducting polymers. Several early studies assumed that the polymer films were rigidly coupled to the quartz crystal so as to relate the mass change to the quartz crystal resonant frequency change via the Sauerbrey equation. However, the rigidity of electronically conducting polymer films is doubtful and it has to be demonstrated. Quartz crystal impedance analysis near the resonance is of paramount importance to get insight into the viscoelastic properties of the film [1] and to avoid misleading in the interpretation of EQCM data.This contribution presents and discusses quartz crystal impedance measurements, performed with a Frequency Response Analyzer in the 9MHz region, and EQCM data collected for a dithienothiophene based polymer.

Quartz Crystal Microbalances Functionalized with Citric Acid-Doped Polyvinyl Acetate Nanofibers for Ammonia Sensing

2020 ◽  
Vol 3 (6) ◽  
pp. 5687-5697 ◽  
Author(s):  
Roto Roto ◽  
Aditya Rianjanu ◽  
Annisa Rahmawati ◽  
Innas Amaliya Fatyadi ◽  
Nursidik Yulianto ◽  
...  
Keyword(s):  
Citric Acid ◽  
Quartz Crystal ◽  
Polyvinyl Acetate ◽  
Ammonia Sensing ◽  
Quartz Crystal Microbalances
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