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Sensors, Volume 4, Issue 9 (September 2004), Pages 136-155

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Research

Open AccessArticle Quartz Microbalance Sensor for the Detection of Acrylamide
Sensors 2004, 4(9), 136-146; doi:10.3390/s40900136
Received: 30 June 2004 / Accepted: 22 September 2004 / Published: 1 October 2004
Cited by 20 | PDF Full-text (271 KB) | HTML Full-text | XML Full-text
Abstract
Several macrocycles of the Hunter-Vögtle type have been identified as superior host compounds for the detection of small amounts of acrylamide. When coated onto the surface of a quartz microbalance, these compounds serve as highly sensitive and selective sensor-active layers for their [...] Read more.
Several macrocycles of the Hunter-Vögtle type have been identified as superior host compounds for the detection of small amounts of acrylamide. When coated onto the surface of a quartz microbalance, these compounds serve as highly sensitive and selective sensor-active layers for their use in electronic noses. In this study, differently substituted macrocycles were investigated including an open-chain analogue and a catenane. Their structure and functional groups are correlated with their observed affinities to acrylamide and related acids and amides. The much smaller response of the open-chain compound and the almost absent sensor response of the catenane suggest that binding occurs within the cavity of the macrocycle. Theoretical calculations agree well with the experimental data even though they do not yet take into account the arrangement of the macrocycles in the sensor-active layer. The lower detection limit of acrylamide is 10 parts per billion (ppb), which is impressively low for this type of sensor. Other related compounds such as acrylic acid, propionamide, or propionic acid show no or significantly lower affinities to the macrocycles in these concentration ranges. Full article
Open AccessArticle Amperometric Sensor Used for Determination of Thiocyanate with a Silver Nanoparticles Modified Electrode
Sensors 2004, 4(9), 147-155; doi:10.3390/s40900147
Received: 15 March 2004 / Accepted: 28 August 2004 / Published: 1 October 2004
Cited by 23 | PDF Full-text (327 KB) | HTML Full-text | XML Full-text
Abstract
A novel electrode modified with silver nanoparticles was fabricated. It is found that the reducibility of silver nanoparticles is higher than for bulk silver by comparing a silver nanoparticles modified electrode with a silver micro-disk electrode. When SCN- was added, a [...] Read more.
A novel electrode modified with silver nanoparticles was fabricated. It is found that the reducibility of silver nanoparticles is higher than for bulk silver by comparing a silver nanoparticles modified electrode with a silver micro-disk electrode. When SCN- was added, a new oxidation peak occurred and the anodic peak current of silver nanoparticles decreased. The new anodic peak current is proportional to the thiocyanate concentration in the range of 5.0×10-7~4.0×10-4 mol/L in pH 6.0 NaH2PO4-Na2HPO4 buffer solutions (PBS). The detection limit (S/N=3) is 4×10-8 mol/L. This method has been applied to the determination of saliva (smoker and non-smoker). Full article

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