Nanosensor Device for Breath Acetone Detection

Abstract

This paper describes a sensor nanotechnology suitable for non-invasive monitoring of a signaling gas, such as acetone, in exhaled breath. This is a nanomedicine tool comprised of a selective acetone nanoprobe working on the principle of ferroelectric poling sensing, and a microelectronics circuit for comparing the actual sensor signal to a predetermined threshold value, displaying the result using LED signals. This on/off type non-invasive diagnostics platform technology is based on nanotechnology, gives a fast response, it is simple to operate and inexpensive to manufacture, and may truly revolutionize personalized medicine.

Study of the Structural, Morphological and Electrical Properties of WO₃ Nanopowders which Use as Gas Sensors

“…[12,13] The sensor sensitivity values [(R air /R gas )×100] to 100 ppm of methanol in the temperature range from ( 50-350 C) at three different milling times are shown in Figure. Figure 5. The sensitivity S =[(R air /R gas )×100] to 100 ppm of methanol as a function of temperature for three films of WO 3 We note from figure 5 improving in sensitivity of three films with increasing temperature until specific temperature degree due to increasing constitute of self-defects on the surface of the film which formed from the indiscriminate expulsion of oxygen which leads to formation of oxygen gaps that gas atoms can be stabilized place then by progressing and increasing of expulsion process with high temperature to get a maximum number of defects at a specific temperature degree that called critical temperature, which the sensitivity be as high as possible, this temperature degree can be called as an operating temperature for the sensor [14] .…”

Selective Chemosensing and Diagnostic Breathanalyzer

“…Figure 3 shows a demonstration of the use of the binary prototype. Ammonia [15], and acetone breath analyzer [9] prototypes respectively have been produced and reported by our research team, based on single breath single-gas detection. Figure 3: Demonstration of the use of the binary breathalyzer prototype for a TV news segment; photo of the binary breathalyzer produced by our group.…”

“…Furthermore, handheld, breathalyzer prototypes have been developed and demonstrated by our team recently [8][9]. The path towards the diagnostic NO breathalyzer is briefly discussed here.…”

Acetone-Sensing Properties of WO3-Based Gas Sensors Operated in Dynamic Temperature Modulation Mode —Effects of Loading of Noble Metal and/or NiO onto WO3—

“…(13) Therefore, many researchers have attempted to develop highly sensitive and selective semiconductor-type acetone sensors by utilizing various types of metal oxides as acetonesensing materials. (10,(14)(15)(16)(17)(18)(19)(20)(21)(22)(23) For example, Righettoni et al have reported that the loading of 10 mol% Si-based components onto WO 3 largely improved the acetone-sensing properties of the WO 3 sensor. (15,16) Wang et al have demonstrated that a 10 mol% Cr 2 O 3 -loaded WO 3 sensor showed a relatively large response to acetone, in comparison with responses to other gases such as ethanol, isoprene, and nitrogen monoxide.…”

“…(15,16) Wang et al have demonstrated that a 10 mol% Cr 2 O 3 -loaded WO 3 sensor showed a relatively large response to acetone, in comparison with responses to other gases such as ethanol, isoprene, and nitrogen monoxide. (17) Xie et al have clarified that the compositional and structural control of ZnO-CuO composite sensors effectively improved the acetone selectivity against toluene, ethanol, and methanol. (23) On the other hand, the operation of gas sensors in dynamic temperature modulation mode is quite effective in enhancing gas-sensing properties, (24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34) particularly for volatile organic compounds (VOCs).…”