Next Issue
Volume 4, August
Previous Issue
Volume 4, May
 
 
sensors-logo

Journal Browser

Journal Browser

Sensors, Volume 4, Issue 6 (June-July 2004) – 3 articles , Pages 84-114

  • Issues are regarded as officially published after their release is announced to the table of contents alert mailing list.
  • You may sign up for e-mail alerts to receive table of contents of newly released issues.
  • PDF is the official format for papers published in both, html and pdf forms. To view the papers in pdf format, click on the "PDF Full-text" link, and use the free Adobe Reader to open them.
Order results
Result details
Section
Select all
Export citation of selected articles as:

Research

536 KiB  
Article
Integration of a Capacitive EIS Sensor into a FIA System for pH and Penicillin Determination
by David Rolka, Arshak Poghossian and Michael J. Schöning
Sensors 2004, 4(6), 84-94; https://doi.org/10.3390/s40670084 - 30 Aug 2004
Cited by 23 | Viewed by 9822
Abstract
A field-effect based capacitive EIS (electrolyte-insulator-semiconductor) sensor with a p-Si-SiO2-Ta2O5 structure has been successfully integrated into a commercial FIA (flow-injection analysis) system and system performances have been proven and optimised for pH and penicillin detection. A flow-through cell was designed taking into account [...] Read more.
A field-effect based capacitive EIS (electrolyte-insulator-semiconductor) sensor with a p-Si-SiO2-Ta2O5 structure has been successfully integrated into a commercial FIA (flow-injection analysis) system and system performances have been proven and optimised for pH and penicillin detection. A flow-through cell was designed taking into account the requirement of a variable internal volume (from 12 μl up to 48 μl) as well as an easy replacement of the EIS sensor. FIA parameters (sample volume, flow rate, distance between the injection valve and the EIS sensor) have been optimised in terms of high sensitivity and reproducibility as well as a minimum dispersion of the injected sample zone. An acceptable compromise between different FIA parameters has been found. For the cell design used in this study, best results have been achieved with a flow rate of 1.4 ml/min, distance between the injection valve and the EIS sensor of 6.5 cm, probe volume of 0.75 ml, cell internal volume of 12 μl. A sample throughput of at least 15 samples/h was typically obtained. Full article
Show Figures

350 KiB  
Article
Study of Influencing Factors of Dynamic Measurements Based on SnO2 Gas Sensor
by Yufeng Sun, Xingjiu Huang, Fanli Meng and Jinhuai Liu
Sensors 2004, 4(6), 95-104; https://doi.org/10.3390/s40670095 - 30 Aug 2004
Cited by 41 | Viewed by 8870
Abstract
The gas-sensing behaviour based on a dynamic measurement method of a single SnO2 gas sensor was investigated by comparison with the static measurement. The influencing factors of nonlinear response such as modulation temperature, duty ratio, heating waveform (rectangular, sinusoidal, saw-tooth, pulse, etc.) [...] Read more.
The gas-sensing behaviour based on a dynamic measurement method of a single SnO2 gas sensor was investigated by comparison with the static measurement. The influencing factors of nonlinear response such as modulation temperature, duty ratio, heating waveform (rectangular, sinusoidal, saw-tooth, pulse, etc.) were also studied. Experimental data showed that temperature was the most essential factor because the changes of frequency and heating waveform could result in the changes of temperature essentially. Full article
Show Figures

401 KiB  
Article
Electrical Characterization of a Thiol SAM on Gold as a First Step for the Fabrication of Immunosensors based on a Quartz Crystal Microbalance
by Asma Tlili, Adnane Abdelghani, Salwa Hleli and Mhamed A. Maaref
Sensors 2004, 4(6), 105-114; https://doi.org/10.3390/s40670105 - 30 Aug 2004
Cited by 62 | Viewed by 10871
Abstract
In order to develop a robust biosensor based on quartz crystal microbalance technique for antigen detection, a control of the steps of the surface functionalization has been performed by impedance spectroscopy. The gold electrode is functionalized with the self-assembled monolayer technique. The high [...] Read more.
In order to develop a robust biosensor based on quartz crystal microbalance technique for antigen detection, a control of the steps of the surface functionalization has been performed by impedance spectroscopy. The gold electrode is functionalized with the self-assembled monolayer technique. The high insulating properties of the acidic thiol monolayer has been characterized with cyclic voltammetry and impedance spectroscopy. The modified surface is activated with N-hydroxysuccinimide(NHS) and 1-(3-(dimethylamino)propyl)-3-ethylcarbodimide hydrochloride(EDC) cross-linker for antibody coupling. The non-specific sites are blocked with bovin serum albumine molecules. Different concentrations of antigen can be detected with a good reversibility in real time with the quartz crystal microbalance. Full article
Show Figures

Previous Issue
Next Issue
Back to TopTop