A5056783639- Electrochemical sensors and biosensors
- Conducting polymers and applications
- Electrochemical Analysis and Applications
- Diamond and Carbon-based Materials Research
- Neuroscience and Neural Engineering
- Carbon Nanotubes in Composites
- Semiconductor materials and devices
- Analytical Chemistry and Sensors
- Graphene research and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Sensor and Energy Harvesting Materials
- Advanced Memory and Neural Computing
- Force Microscopy Techniques and Applications
- EEG and Brain-Computer Interfaces
- Surface Modification and Superhydrophobicity
- Spectroscopy Techniques in Biomedical and Chemical Research
- Analog and Mixed-Signal Circuit Design
- Electrocatalysts for Energy Conversion
- Spectroscopy and Chemometric Analyses
- Biosensors and Analytical Detection
- X-ray Diffraction in Crystallography
- Semiconductor materials and interfaces
- Sensory Analysis and Statistical Methods
- Electron and X-Ray Spectroscopy Techniques
Aalto University
2013-2021
Espoo Music Institute
2015
A significant problem with implantable sensors is electrode fouling, which has been proposed as the main reason for biosensor failures in vivo. Electrochemical fouling typical dopamine (DA) its oxidation products are very reactive and resulting polydopamine a robust adhesion capability to virtually all types of surfaces. The degree DA different carbon electrodes terminations was determined using cyclic voltammetry (CV) scanning electrochemical microscopy (SECM) approach curves imaging. rate...
Successful deployment of carbon nanomaterials in many applications, such as sensing, energy storage, and catalysis, relies on the selection, synthesis, tailoring surface properties. Predictive analysis behavior is difficult without detailed knowledge differences between various their functionalization, thus leaving selection process to traditional trial-and-error work. The present characterization fills this gap for nanomaterial properties with respect chemical states functionalization. We...
We integrated a magnetohydrodynamic fluid extractor with an amperometric glucose biosensor to develop wearable device for non-invasive monitoring. Reproducible extraction through the skin and efficient transport of extracted surface are prerequisites optimized enzyme immobilization interface layer between sensing skin. The monitoring was evaluated by extracting porcine followed detection at biosensor. featured screen-printed Prussian Blue that coated containing oxidase. Both physical...
In this study we present for the first time tetrahedral amorphous carbon (ta-C)—a partially reduced graphene oxide (PRGO) hybrid electrode nanomaterial platform electrochemical sensing of dopamine (DA). Graphene was synthesized with modified Hummer's method. Before modification ta-C by drop casting, partial reduction GO carried out to improve properties and adhesion thin film. A facile nitric acid treatment that slightly reoxidized surface chemistry subsequently performed further electrodes....
Linking structural and compositional features with the observed electrochemical performance is often ambiguous sensitive to known unknown impurities. Here an extensive experimental investigation augmented by computational analyses linked characterization of in situ nitrogen-doped tetrahedral amorphous carbon thin films (ta-C:N). Raman spectroscopy combined X-ray reflectivity shows nitrogen disrupting sp3 C–C structure reference ta-C, supported observations graphitic substitution absorption...
Abstract Age structure in most developed countries is changing fast as the average lifespan increasing significantly, calling for solutions to provide improved treatments age-related neurological diseases and disorders. In order address these problems, a reliable way of recording information about neurotransmitters from vitro vivo applications needed better understand disorders well currently used treatments. Likewise, recent developments medicine, especially with opioid crisis, are...
Complex experimental investigation of the physical properties prospective electrode material based on Ti/ta-C bilayers in relation to their electrochemical behaviour, supported by computational simulation.
For therapeutic purposes, an accurate measurement of dopamine level in situ would be highly desirable. A novel strategy for the selective determination concentration based on diamond-like carbon (DLC) electrode is presented this abstract. The developed DLC able to detect 10 μM and has improved sensitivity compared platinum. Compared fiber electrodes, more stable because background current much lower.
Abstract Undoped a‐C thin films were deposited with varying power density from 10 to 25 W/cm 2 using unbalanced closed‐field magnetron sputtering (CFUBMS). The effect of on the physical and electrochemical properties was investigated by experimental characterization methods atomistic simulations. XPS indicated that composed mostly sp ‐bonded carbon (55–58 at.%) a small amount oxygen (8–9 in surface region. appeared completely amorphous XRD. I D /I G ratio obtained Raman spectroscopy an...
This paper describes the design of an integrated sensor interface for dopamine detection. The circuit fabricated in 65 nm CMOS technology utilizes a time-based analog-to-digital conversion built around ring oscillator. supports wide input current range ±1.2 μA and sampling rate 1 - 20 kHz, enabling sub-second detection neurochemicals within supported range. Measured results with physiologically relevant concentration 500 nM demonstrate ability to detect oxidation reduction peaks, which...
This paper describes the design of an integrated sensor interface for neurochemical signal acquisition. Neurochemicals undergo oxidation and reduction reactions in presence action potential. Thus, knowledge potentials neurochemicals is important neurostimulation treatment neurological neurodegenerative diseases. The circuit utilizes a mixed-signal to detect induced current from neurochemical, response applied voltage. fabricated 65nm CMOS technology supports wide input range ±1.2μA with...