Transient devices designed to undergo programmable transformations

Patent metadata

Field	Value
Publication number	US-10396173-B2
Application number	US-201715632004-A
Country	US
Kind code	B2
Filing date	Jun 23, 2017
Priority date	Dec 1, 2011
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

The invention provides transient devices, including active and passive devices that electrically and/or physically transform upon application of at least one internal and/or external stimulus. Materials, modeling tools, manufacturing approaches, device designs and system level examples of transient electronics are provided.

First claim

What is claimed is:

1. A passive transient electronic device comprising:
a substrate; and
one or more inorganic components supported by said substrate; wherein said one or more inorganic components independently comprise a selectively transformable material, wherein said one or more inorganic components have a preselected transience profile in response to an external or internal stimulus;
wherein at least partial transformation of said one or more inorganic components provides a programmable transformation of the passive transient electronic device in response to said external or internal stimulus and at a pre-selected time or at a pre-selected rate, wherein said programmable transformation provides a change in function of the passive transient electronic device from a first condition to a second condition;
wherein change in function transforms said one or more inorganic components from:
(i) a NOR gate to a NAND gate;
(ii) an inverter to an isolated transistor;
(iii) a resistor to a diode;
(iv)a NAND gate to an inverter;
(v) a NOR gate to an isolated transistor; or
(vi) a NAND gate to an isolated transistor.

2. The device of claim 1 , wherein said programmable transformation of said one or more inorganic components occurs by a process other than bioresorption.

3. The device of claim 1 , wherein said programmable transformation of said one or more inorganic components occurs:
(i) by a phase change, wherein at least a portion of said one or more inorganic components undergo at least partial sublimation or melting;
(ii) via at least partial dissolution of said one or more inorganic semiconductor components or said one or more metallic conductor components in a solvent;
(iii) via at least partial hydrolysis of said one or more inorganic semiconductor components or said one or more metallic conductor components;
(iv) via at least partial etching or corrosion of said one or more inorganic semiconductor components or said one or more metallic conductor components;
(v) by a photochemical reaction wherein at least a portion of said one or more inorganic semiconductor components or said one or more metallic conductor components absorb electromagnetic radiation and undergo an at least partial chemical or physical change
(vi) by an electrochemical reaction; or
(vii) by a chemical or physical change wherein at least a portion of said one or more inorganic semiconductor components or said one or more metallic conductor components is converted to an insulator,

thereby providing said programmable transformation of the passive transient electronic device.

4. The device of claim 1 , wherein said preselected transience profile is characterized by a transformation of 0.01% to 100% of said one or more inorganic components over a time interval selected from the range of 1 ms to 2 years, thereby providing said programmable transformation of the passive transient electronic device.

5. The device of claim 1 , wherein said preselected transience profile is characterized by a decrease in electrical conductivity of said one or more inorganic components at a rate selected over the range of 10 10 S·m −1 s −1 to 1 S·m −1 s −1 .

6. The device of claim 1 , wherein said external or internal stimulus comprises a change in biological environment, a change in temperature, a change in pressure, exposure to electromagnetic radiation, contact with a chemical agent, application of an electric field, application of a magnetic field, exposure to a solvent, change in pH of an external environment, change in salt concentration of an external environment, or application of an anodic voltage.

7. The device of claim 1 , further comprising an encapsulating material at least partially encapsulating one or more of said inorganic components, wherein said encapsulating material comprises a selectively removable material that is at least partially removed to expose underlying inorganic components.

8. The device of claim 7 , wherein said encapsulating material is removed in response to said external or internal stimulus.

9. The device of claim 7 , wherein said encapsulating material comprises a material selected from the group consisting of MgO, silk, collagen, gelatin, PLGA, polyvinylalcohol (PVA), PLA, SiO 2 , polyanhydrides (polyesters), polyhdroxyalkanates (PHAs) and polyphosphates.

10. The device of claim 1 , wherein each of said one or more inorganic components independently comprise Si, Ga, GaAs, ZnO or any combination of these.

11. The device of claim 1 , wherein said one or more inorganic components independently comprise Mg, W, Fe, or an alloy thereof.

12. The device of claim 1 , wherein said one or more inorganic components independently comprise an alloy of Mg with one or more additional materials selected from the group consisting of Al, Ag, Ca, Li, Mn, Si, Sn, Y, Zn, and Zr, wherein said one or more additional materials of said alloy has a concentration equal to or less than 10% by weight.

13. The device of claim 1 , wherein said substrate comprises silk.

14. The device of claim 1 , wherein a time for a thickness of selectively transformable material to reach zero is given by:

t
c

=

4
⁢

ρ
m

⁢

M
⁡

(

H
2

⁢
O

)

kw
0

⁢

M
⁡

(
m
)

⁢

kh
0
2

D

tanh
⁢

kh
0
2

D

;

where t c is the critical time, ρ m is the mass density of the material, M(H 2 O) is the molar mass of water, M(m) is the molar mass of the material, h 0 is the initial thickness of the material, D is the diffusivity of water, k is the reaction constant for the dissolution reaction, and w 0 the initial concentration of water; wherein k has a value selected from the range of 10 5 to 10 −10

Assignees

• Univ Illinois
• Tufts College

Inventors

• Rogers John A
• Omenetto Fiorenzo G
• Hwang Suk-Won
• Tao Hu
• Kim Dae-Hyeong
• Kaplan David

Classifications

• H10W74/47

  comprising organic materials, e.g. plastics or resins · CPC title

• H01Q1/2283

  mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package · CPC title

• H01Q7/00

  Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop · CPC title

• B82Y10/00

  Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic · CPC title

• Y10S257/922

  with means to prevent inspection of or tampering with an integrated circuit, e.g. "smart card", anti-tamper · CPC title