Page 17 - MSAM-1-3

Materials Science in Additive Manufacturing Biodegradable sustainable electronics

Table 3. Dielectric properties of various biodegradable materials
Material Dielectric constant (1 kHz) Breakdown field (MV cm ) Loss tangent (100 mHz) References
‑1
Adenine ~3.85 ~1.5 ~4 × 10 -3 [84]
Guanine ~4.35 ~3.5 ~7 × 10 -3
Glucose ~6.35 ~1.5 ~5 × 10 -2
Lactose ~6.55 ~4.5 ~2 × 10 -2
Sucrose - >3 ~8 × 10 -2
Caffeine ~4.1 ~2 ~9 × 10 -2
SiO ~3.9 ~5-15 -
2
CA a 8.63 - 0.26 [93]
CA/Al O (25 wt%) a 27.57 - 0.64
3
2
CNF - 0.6138 - [94]
CNF/CNT (4.5 wt%) - 0.4258 -
a Dielectric constant at 50 Hz.

A C

B

Figure 5. Increase in dielectric constant of cellulose acetate with increase in the addition of high-κ additives, Al O , (B) antenna sample using cotton fabric
3
2
as the substrate and the dielectric material, and (C) a sensor array of 4 × 5 pressure-sensitive elements that can quickly respond to detect the presence of a
grain of salt (weights: 55, 9, and 5 mg). Figure (A) is adapted from Deshmukh et al. Reprinted with permission from Mukai et al. and Boutry et al. [95,103] .
[93]
devices [117] , energy harvesters, [6,41,119-121] and transistors . breaks down more quickly in water. This trade-off restricts
[17]
Silk in water degrades at a well-characterized rate that can be the manufacture of devices using transfer printing on silk
easily adjusted by several orders of magnitude by regulating substrates. Hwang et al. [13,17] fabricated Si-based microheaters
the degree of crystallization. Although highly crystalline for transient thermal therapy on silk using transfer printing
silk degrades gradually, it can be fragile and challenging method. These devices degrade after 15 days to prevent
to handle. While less crystalline silk is more flexible, it infections after surgery (Figure 7A and B).

Volume 1 Issue 3 (2022) 11 https://doi.org/10.18063/msam.v1i3.15