Conference Proceeding
Refine
Year of publication
Institute
- INB - Institut für Nano- und Biotechnologien (52) (remove)
Language
- English (39)
- German (12)
- Multiple languages (1)
Document Type
- Conference Proceeding (52) (remove)
Keywords
- Biosensor (6)
- Graduiertentagung (4)
- Aachen / Fachhochschule Aachen (1)
- Bio-Sensors (1)
- Biosensorik (1)
- GaAs hot electron injector (1)
- Gas sensor (1)
- Graduate symposium (1)
- Graduierter (1)
- Gunn diode (1)
- Heavy metal detection (1)
- ISFET (1)
- Nano Materials (1)
- Nanomaterial (1)
- Nanostructuring (1)
- Nanotechnologie (1)
- Promotionsstudium (1)
- Tobacco mosaic virus (1)
- Wafer (1)
- acetoin (1)
- capacitive field-effect biosensor (1)
- capillary micro-droplet cell (1)
- catalytic decomposition (1)
- enzyme immobilization (1)
- hydrogen peroxide (1)
- layer expansion (1)
- microwave generation (1)
- organic PVC membranes (1)
- pattern-size reduction (1)
- self-aligned patterning (1)
- sterilisation (1)
- thin-film microsensors (1)
- wafer-level testing (1)
A capacitive electrolyte-insulator-semiconductor (EISCAP) biosensor modified with Tobacco mosaic virus (TMV) particles for the detection of acetoin is presented. The enzyme acetoin reductase (AR) was immobilized on the surface of the EISCAP using TMV particles as nanoscaffolds. The study focused on the optimization of the TMV-assisted AR immobilization on the Ta 2 O 5 -gate EISCAP surface. The TMV-assisted acetoin EISCAPs were electrochemically characterized by means of leakage-current, capacitance-voltage, and constant-capacitance measurements. The TMV-modified transducer surface was studied via scanning electron microscopy.
Novel organic membrane-based thin-film microsensors for the determination of heavy metal cations
(2006)
A first step towards the fabrication and electrochemical evaluation of thin-film microsensors based on organic PVC membranes for the determination of Hg(II), Cd(II), Pb(II) and Cu(II) ions in solutions has been realised. The membrane-coating mixture used in the preparation of this new type of microsensors is incorporating PVC as supporting matrix, o-nitrophenyloctylether (o-NPOE) as solvent mediator and a recently synthesized Hg[dimethylglyoxime(phene)]2+ and Bis-(4-hydroxyacetophenone)-ethylenediamine as electroactive materials for Hg(II) and Cd(II), respectively. A set of three commercialised ionophores for Cd(II), Pb(II) and Cu(II) has been also used for comparison. Thin-film microsensors based on these membranes showed a Nernstian response of slope (26-30 mV/dec.) for the respective tested cations. The potentiometric response characteristics (linear range, pH range, detection limit and response time) are comparable with those obtained by conventional membranes as well as coated wire electrodes prepared from the same membrane. The realisation of the new organic membrane-based thin-film microsensors overcomes the problem of an insufficient selectivity of solid-state-based thinfilm sensors.