Nanostructured sensors

However, optical nanostructured sensors exhibit a significant color change only at relatively high partial pressures of detected vapors, while at relative vapor partial... 

The critical parameter for work of a nanostructured sensor is the value x — xc at which AV(x) equals kT. According to formula (13) the value xc = LDkT/Vs. 

This chapter summarizes recent progress in development of ultrasensitive electrochemical devices to measure cancer biomarker proteins. The emphasis is on the use of nanoparticles and nanostructured sensors aimed for use in clinical cancer... 

There are two main approaches possible for the design of these innovative nanostructured sensors, in which the receptor and luminescent units can - or can not - be covalently linked together to form a chemosensor. These groups should be... 

W Gopel, "Nanostructured Sensors for Molecular Recogmtion", Conf Proc NATO ARW, Cambridge (GB) 4/1994 and Far Proc Roy Soc, in press... 

In this work, simple (single-use) biosensors with a layer double stranded (ds) calf thymus DNA attached to the surface of screen-printed carbon electrode assembly have been prepared. The sensor efficiency was significantly improved using nanostructured films like carbon nanotubes, hydroxyapatite and montmorillonite in the polyvinylalcohol matrix. 

Titanium dioxide supported gold catalysts exhibit excellent activity for CO oxidation even at temperatures as low as 90 K [1]. The key is the high dispersion of the nanostructured gold particles over the semiconducting Ti02 support. The potential applications of ambient temperature CO oxidation catalysts include air purifier, gas sensor and fuel cell [2]. This work investigates the effects of ozone pretreatment on the performance of Au/Ti02 for CO oxidation. 

Chitosan-clay bio-nanocomposites are very stable materials without significant desorption of the biopolymer when they are treated with aqueous salt solutions for long periods of time. In this way, they act as active phases of electrochemical sensors for detection of ions (Figure 1.8). The particular nanostructuration of the biopolymer in the interlayer region drives the selective uptake of monovalent versus polyvalent anions, which has been applied in electrode arrays of electronic tongues [132]. 

Micro- (and even nano-) electrode arrays are commonly produced with photolithography and electronic beam techniques by insulating of macro-electrode surface with subsequent drilling micro-holes in an insulating layer [136, 137], Physical methods are, however, expensive and, besides that, unsuitable for sensor development in certain cases (for instance, for modification of the lateral surface of needle electrodes). That s why an increasing interest is being applied to chemical approaches of material nanostructuring on solid supports [140, 141],... 

E.A. Puganova and A.A. Karyakin, New materials based on nanostructured Prussian blue for development of hydrogen peroxide sensors. Sens. Actuators B chem. 109, 167-170 (2005). 

Corres and coworkers demonstrated a couple pH sensors realized by ESA deposition of nanostructured polymeric materials. Those sensors represented a truly engineered design exploiting the rules of the modal transition64. 

Tomchenko, A. A. Harmer, G. P. Marquis, B. T., Detection of chemical warfare agents using nanostructured metal oxide sensors, Sens. Actuators B. 2005, 108,41 55... 

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