significatively and a largely achieved piezoresistance. Later, the same author published

a study developing SiC nanowires using a photolithography process and FIB. Before the

nanowire fabrication, it was growth of a thin film of SiC on a substrate by low-pressure

CVD, showing that the techniques can be successfully combined, and then, the micro­

patterns were etched, followed by the subsequent processes [36].

13.4.2.3 Transferring Processes

The process of transferring nanostructures to flexible substrates can be realized mainly in

two ways: through a dry or wet transfer method. The dry transfer method can be carried

out through a process of segregation a nanowire because of the adhesion force between

them and the substrate, and an alignment process due to the directional shear force

(named as contact printing method). The technique can be extended to different pro­

cesses, including a roll printing method towards larger areas.

The wet transfer method is an alternative to transferring the nanostructures to flexible

substrates. In this way, a nanowire-based solution can form a film into a pre-patterned

substrate based on the drop-casting process. Nevertheless, there are some disadvantages,

such as the low device yield and poor contact with electrodes. To overcome these barriers,

alternatives have been studied, such as the Langmuir-Blodgett technique [29].

13.5 Applications – Where They Can Be Used in Bioelectronics?

Due to the diverse properties and advances in the development of these materials, WBG

semiconductors are being used in several areas, such as in ultraviolet devices [37–39] and

sensors [40–42]. In addition, the possibility of transferring WBG thin films/nanowires

onto substrates that are preferentially flexible and biocompatible, has further expanded

the applications of these materials, especially in bioelectronics devices. In this section, the

advancement of the most widely used bioelectronics applications of WBG compounds

will be described (Figure 13.8).

FIGURE 13.8

Main applications of wide bandgap (WBG) compounds.

Wide Bandgap Semiconductors

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