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Although robust chemical vapor detection by chemielectric point sensors remains as a largely unmet challenge at present, the best performance to date and the most likely avenue for future progress is with sensor designs in which the transductive element is a disordered nanostructured material. We here review the evidence for this claim, with illustrations drawn from recent work on sensors made from...
In this paper a study of chemiresistor sensors based on Single Wall Carbon Nanotube films deposited at low temperature by means of a spray technique is presented. A nanodispersion of nanotube powder in a non-polar 1,2-Dichloroethane solvent was used as starting solution. Electron Microscopy in Scanning and Transmission mode were used in order to verify the morphological properties of the deposited...
We are reporting the development of a conductive nanocomposite for sensing applications. Unlike the previously reported research, our process flow allows for fabrication of nanocomposite structures that can be patterned using typical lithography techniques for fine features. This advantage lets us fabricate embedded micro-sensors within a multi-layer polymer structure. In order to demonstrate the...
Attenuated total reflectance Fourier transform infrared (ATR-FTIR) based chemical sensors have been widely used for the detection of a variety of hydrocarbon compounds. The selection of an appropriate chemoselective membrane material to coat the zinc selenide (ZnSe) internal reflectance element is a crucial step in achieving acceptable sensor performance. Although there are many materials available,...
A multi-walled carbon nanotubes (MWNTs) film modified glassy carbon electrode (GCE) has been fabricated and showed potent electrocatalytic activity toward the electrochemical oxidation of salbutamol sulfate in phosphate buffer solution (pH=7.4). The linear dependence between the oxidation peak current of salbutamol sulfate and its concentration was observed in the range from 5.0 - 25 mumol/L with...
A surface acoustic wave (SAW) gas sensor with multiwalled carbon nanotubes (CNTs) layered films as chemically interactive nanomaterial is presented. A SAW two-port resonator integrated on ST-cut quartz substrate has been functionally characterized as oscillator in dual differential mode at the resonant frequency of 433.92 and 915 MHz. Nanocomposite layers based on filler of CNTs, grown by RF-plasma...
Due to their unique electrical and mechanical properties carbon nanotubes (CNTs) are the most studied material in the nanotechnology. These material properties involve interesting advantages for sensors, such as a short reaction time, a higher sensitivity and novel sensing principles. In this paper we evaluate the potential of CNTs for different sensor applications. Although nanotechnology is still...
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