Biomedical Engineering Reference
In-Depth Information
films, vertically aligned and horizontally aligned bundled mats,
nanofillers in nanocomposite to fabricate molecular films with
host-guest chemistry, finally single tube for individual nanosensors.
However, the synthesis process and fabrication of the CNTs is not yet
fully controlled. Although recent advances in nanotechnology and
nanomanipulation, the composition, size, and structure of the CNTs
cannot be properly regulated with repeatable and reliable growth
processes. These are very exciting research topics in the modern
physics of materials science, nanoscience, and nanotechnology.
Generally, a sensor is a device combining a transducer which
converts a physical or chemical quantity into an electrical, optical,
or other measurable quantity. For example, a chemical sensor, and in
particular a gas sensor, is intended to determine the composition and
concentration of the chemical stimulus inputs via an electrical signal
output. Figure 9.8 shows a typical scheme of a gas sensor based on
adsorbent CNTs as a proof of concept for a designed nanosensor.
Figure 9.8
Scheme of a CNT-based gas sensor with advanced transducer
and electronics.
The solid state gas sensors are miniaturized devices constituted
by a
and a chemically sensitive interface to an external
measurement (type of gaseous analyte, concentration of analyte).
The optimal combination between the
transducer
transducer
and
sensitive
material
suitable for a specific application with
evident advantages in terms of high sensitivity, low limit of detection,
fast response and rapid recovery, high stability, low drift of signal,
high resolution, selectivity, repeatability of response, long life of
operation, low power consumption, small sizes and small volume
and weight, low cost.
provides a
sensor
