Conducting polymers entered the research field in late 70 ́s and efforts aimed at achieving printed electronics started a decade later. This thesis treats printable organic electrochemical transistors (OECT). Some conjugated polymers can be switched between a high conducting and a low conducting state in an electrochemical cell. In this thesis, the work carried out using poly(3,4ethylenedioxythi...

Simultaneous acquisition of in vivo electrophysiological and neurochemical information is essential for understanding how endogenous neurochemicals modulate the dynamics of brain activity. However, up to now such a task has rarely been accomplished due to the major technical challenge of operating two independent recording systems simultaneously in real-time. Here we propose a simpler solution ...

Miniaturization of analytical benchtop procedures into the micro-scale provides significant advantages in regards to reaction time, cost, and integration of pre-processing steps. Utilizing these devices towards the analysis of DNA hybridization events is important because it offers a technology for real time assessment of biomarkers at the point-of-care for various diseases. However, when the d...

A disposable pump-free electrochemical microfluidic device made by using a multilayer lamination technique is proposed for diagnosis of glycosylation disorders. Thanks to the stacking polyethylene terephthalate (PET) films and double adhesive layers, it possible create geometry that allows filling tailored channels in fixed time. In main channel this passive device, necessary steps perform dete...

ytical device that combines certain biological and physical elements. Several types of transducers are used for elements, such as optical, electrochemical, thermic, or gravimetric. Nowadays, electrochemical have become widely the application biomedical sensors. Electrochemical measurement devices called screen-printed electrodes (SPEs) created by printing several ink on a ceramic plastic substr...

A hybrid bio-organic electrochemical transistor was developed by interfacing an organic semiconductor, poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate), with the Physarum polycephalum cell. The system shows unprecedented performances since it could be operated both as a transistor, in a three-terminal configuration, and as a memristive device in a two terminal configuration m...

We report a paper-based assay platform for detection of ricin a chain. The paper platform is assembled by simple origami paper folding. The sensor is based on quantitative, electrochemical detection of silver nanoparticle labels linked to a magnetic microbead support via a ricin immunosandwich. Importantly, ricin was detected at concentrations as low as 34 pM. Additionally, the assay is robust,...

Microfluidics-based biochip devices are developed to perform DNA analysis from complex biological sample solutions. Microfluidic mixers, valves, pumps, channels, chambers, heaters, and DNA microarray sensor are integrated to perform magnetic bead-based rare cell capture, cell preconcentration and purification, cell lysis, polymerase chain reaction, DNA hybridization and electrochemical detectio...

This paper describes synthesis of ultrathin pinhole-free insulating aluminum oxide layers for electronic device protection in corrosive liquid environments, such as phosphate buffered saline (PBS) or clinical fluids, to enable emerging biomedical applications such as biomolecular sensors. A pinhole-free 25-nm thick amorphous aluminum oxide layer has been achieved using ultra-high vacuum DC magn...