Conducting polymer-based biosensors

Contractor, A.Q.; Sureshkumar, T.; Narayanan, Rohini Kuttiplavil; Sukeerthi, S.; Lal, R.; Srinivasa, R.S.

doi:10.1016/0013-4686(94)e0054-4

Cited by 114 publications

(52 citation statements)

References 13 publications

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“…The usual potentiometric approach utilises the glass electrode [2,3] due to its simplicity of handling and low sensitivity to many potential interferents within the solution to be measured. Other devices include ion-selective membranes [4,5], ion-selective field effect transistors [3,6], two-terminal microsensors [7] as well as optical [8] and conductometric [9] pH-sensing devices. However, these types of devices can often suffer from instability and/or drift and therefore require constant recalibration [10].…”

Section: Introductionmentioning

confidence: 99%

Anthraquinone-derivatised carbon powder: reagentless voltammetric pH electrodes

Wildgoose

2003

Talanta

100

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Section: Introductionmentioning

confidence: 99%

Anthraquinone-derivatised carbon powder: reagentless voltammetric pH electrodes

Wildgoose

2003

Talanta

100

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“…been made possible by the rapid development of semiconductor technology and sensor integration with microelectronic devices, such as FET devices [39,40]. Now there is an increased interest in conductometric immunosensors in combination with nanostructures, and especially nanowires, for biosensing [19,24].…”

Section: −11mentioning

confidence: 99%

Electrochemical Biosensors - Sensor Principles and Architectures

Grieshaber

MacKenzie

Vörös

et al. 2008

Sensors

854

636

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Quantification of biological or biochemical processes are of utmost importance for medical, biological and biotechnological applications. However, converting the biological information to an easily processed electronic signal is challenging due to the complexity of connecting an electronic device directly to a biological environment. Electrochemical biosensors provide an attractive means to analyze the content of a biological sample due to the direct conversion of a biological event to an electronic signal. Over the past decades several sensing concepts and related devices have been developed. In this review, the most common traditional techniques, such as cyclic voltammetry, chronoamperometry, chronopotentiometry, impedance spectroscopy, and various field-effect transistor based methods are presented along with selected promising novel approaches, such as nanowire or magnetic nanoparticle-based biosensing. Additional measurement techniques, which have been shown useful in combination with electrochemical detection, are also summarized, such as the electrochemical versions of surface plasmon resonance, optical waveguide lightmode spectroscopy, ellipsometry, quartz crystal microbalance, and scanning probe microscopy. The signal transduction and the general performance of electrochemical sensors are often determined by the surface architectures that connect the sensing element to the biological sample at the nanometer scale. The most common surface modification techniques, the various electrochemical transduction mechanisms, and the choice of the recognition receptor molecules all influence the ultimate sensitivity of the sensor. New nanotechnology-based approaches, such as the use of engineered ion-channels in lipid bilayers, the encapsulation of enzymes into vesicles, polymersomes, or polyelectrolyte capsules provide additional possibilities for signal amplification. In particular, this review highlights the importance of the precise control over the delicate interplay between surface nano-architectures, surface functionalization and the chosen sensor transducer principle, as well as the usefulness of complementary characterization tools to interpret and to optimize the sensor response.

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“…In addition, conducting polymers are known for better electronic communication through pi electrons. They also enhance ion to electron transduction performance of sensors and thereby increase the linear dynamic sensitivity, response time and stability of the sensor [31][32][33][34][35][36][37][38][39][40]. pH sensor is a type of chemical sensor extensively studied for the identification of the hydrogen ion concentration of the medium depending on the interaction and ion exchange between polymer and hydrogen ion in the bulk.…”

Section: Conducting Polymer Based Ph Transducersmentioning

confidence: 99%