Article
Refine
Year of publication
Document Type
- Article (519) (remove)
Has Fulltext
- no (519) (remove)
Keywords
- LAPS (4)
- hydrogen peroxide (3)
- Bacillus atrophaeus (2)
- Field-effect sensor (2)
- Light-addressable potentiometric sensor (2)
- Raman spectroscopy (2)
- field-effect sensor (2)
- tobacco mosaic virus (TMV) (2)
- (Bio)degradation (1)
- Bacillus atrophaeus spores (1)
- CNOT (1)
- Calorimetric gas sensor (1)
- Capacitive field-effect (1)
- Capacitive model (1)
- Chemical images (1)
- Chemical imaging sensor (1)
- Chemical sensor (1)
- C–V method (1)
- DNA biosensor (1)
- DNA hybridization (1)
- DPA (dipicolinic acid) (1)
- Dehydrogenase (1)
- Diaphorase (1)
- EIS capacitive sensor (1)
- Electrolyte–insulator–semiconductor (1)
- Enzymatic biosensor (1)
- Enzyme coverage (1)
- Enzyme logic gate (1)
- Field effect (1)
- Field-effect biosensor (1)
- Hydrogen peroxide (1)
- Impedance spectroscopy (1)
- Label-free detection (1)
- Layer-by-layer adsorption (1)
- LbL films (1)
- Light-addressable Potentiometric Sensor (1)
- MOS (1)
- Multianalyte detection (1)
- Negative impedance convertor (1)
- O2 plasma (1)
- Organic light-emitting diode display (1)
- Penicillin (1)
- Poly(allylamine hydrochloride) (1)
- Poly(d,l-lacticacid) (1)
- Polyimide (1)
- Real-time monitoring (1)
- Resonance-mode measurement (1)
- Simultaneous determination (1)
- Sn₃O₄ (1)
- Sterilisation process (1)
- TMV adsorption (1)
- Ta₂O₅ gate (1)
- XOR (1)
- annealing (1)
- artificial olfactory image (1)
- barium strontium titanate (1)
- biosensor (1)
- biosensors (1)
- calorimetric gas sensor (1)
- calorimetric gas sensor;hydrogen peroxide;wireless sensor system (1)
- capacitive field-effect sensor (1)
- catalytic metal (1)
- chemical sensor (1)
- contactless conductivity sensor (1)
- electrolyte-insulator semiconductor sensor (EIS) (1)
- electronic nose (1)
- endospores (1)
- enzymatic (bio)degradation (1)
- enzyme cascade (1)
- field-effect structure (1)
- gas sensor (1)
- glucose oxidase (GOx) (1)
- heavy metals (1)
- high-k material (1)
- horseradish peroxidase (HRP) (1)
- hydroxylation (1)
- immobilization (1)
- impedance spectroscopy (1)
- in-situ monitoring (1)
- lable-free detection (1)
- light-addressable potentiometric sensor (1)
- light-addressing technologies (1)
- metal-oxide-semiconductor structure (1)
- multi-functional material (1)
- nanobelts (1)
- novel photoexcitation method (1)
- optical sensor setup (1)
- optical spore trapping (1)
- optical trapping (1)
- organosilanes (1)
- plant virus detection (1)
- plug-based microfluidic device (1)
- poly(d, l-lactic acid) (1)
- scanned light pulse technique (1)
- silanization (1)
- spatial resolution (1)
- sterilisation (1)
- sterilization (1)
- sterilization conditions (1)
- surface functionalization (1)
- temperature (1)
- tilted constant illumination (1)
- turnip vein clearing virus (TVCV) (1)
- visualization (1)
Institute
- Fachbereich Medizintechnik und Technomathematik (519) (remove)
A light-addressable potentiometric sensor (LAPS) can measure the concentration of one or several analytes at the sensor surface simultaneously in a spatially resolved manner. A modulated light pointer stimulates the semiconductor structure at the area of interest and a responding photocurrent can be read out. By simultaneous stimulation of several areas with light pointers of different modulation frequencies, the read out can be performed at the same time. With the new proposed controller electronic based on a field-programmable gate array (FPGA), it is possible to control the modulation frequencies, phase shifts, and light brightness of multiple light pointers independently and simultaneously. Thus, it is possible to investigate the frequency response of the sensor, and to examine the analyte concentration by the determination of the surface potential with the help of current/voltage curves and phase/voltage curves. Additionally, the ability to individually change the light intensities of each light pointer is used to perform signal correction.
Chemical imaging systems allow the visualisation of the distribution of chemical species on the sensor surface. This work represents a new flexible approach to read out light-addressable potentiometric sensors (LAPS) with the help of a digital light processing (DLP) set-up. The DLP, known well for video projectors, consists of a mirror-array MEMS device, which allows fast and flexible generation of light patterns. With the help of these light patterns, the sensor surface of the LAPS device can be addressed. The DLP approach has several advantages compared to conventional LAPS set-ups, e.g., the spot size and the shape of the light pointer can be changed easily and no mechanical movement is necessary, which reduces the size of the set-up and increases the stability and speed of the measurement. In addition, the modulation frequency and intensity of the light beam are important parameters of the LAPS set-up. Within this work, the authors will discuss two different ways of light modulation by the DLP set-up, investigate the influence of different modulation frequencies and different light intensities as well as demonstrate the scanning capabilities of the new set-up by pH mapping on the sensor surface.